diff --git a/.idea/copyright/Apache.xml b/.idea/copyright/Apache.xml
index 3bbf1c12f..ba8d8714a 100644
--- a/.idea/copyright/Apache.xml
+++ b/.idea/copyright/Apache.xml
@@ -1,6 +1,6 @@
 <component name="CopyrightManager">
   <copyright>
-    <option name="notice" value="Copyright (C) 2015 Hippo Seven&#10;&#10;Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);&#10;you may not use this file except in compliance with the License.&#10;You may obtain a copy of the License at&#10;&#10;     http://www.apache.org/licenses/LICENSE-2.0&#10;&#10;Unless required by applicable law or agreed to in writing, software&#10;WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.&#10;See the License for the specific language governing permissions and&#10;limitations under the License." />
+    <option name="notice" value="Copyright (C) 2014-2015 Hippo Seven&#10;&#10;Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);&#10;you may not use this file except in compliance with the License.&#10;You may obtain a copy of the License at&#10;&#10;     http://www.apache.org/licenses/LICENSE-2.0&#10;&#10;Unless required by applicable law or agreed to in writing, software&#10;WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.&#10;See the License for the specific language governing permissions and&#10;limitations under the License." />
     <option name="keyword" value="Copyright" />
     <option name="allowReplaceKeyword" value="" />
     <option name="myName" value="Apache" />
diff --git a/.idea/copyright/profiles_settings.xml b/.idea/copyright/profiles_settings.xml
index e51058471..696d564e7 100644
--- a/.idea/copyright/profiles_settings.xml
+++ b/.idea/copyright/profiles_settings.xml
@@ -1,7 +1,3 @@
 <component name="CopyrightManager">
-  <settings default="Apache">
-    <module2copyright>
-      <element module="All" copyright="Apache" />
-    </module2copyright>
-  </settings>
+  <settings default="Apache" />
 </component>
\ No newline at end of file
diff --git a/app/app.iml b/app/app.iml
index b9e6d4402..250c46593 100644
--- a/app/app.iml
+++ b/app/app.iml
@@ -84,6 +84,7 @@
     </content>
     <orderEntry type="jdk" jdkName="Android API 21 Platform" jdkType="Android SDK" />
     <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" exported="" name="annotations-12.0" level="project" />
     <orderEntry type="library" exported="" name="appcompat-v7-21.0.3" level="project" />
     <orderEntry type="library" exported="" name="support-annotations-21.0.3" level="project" />
     <orderEntry type="library" exported="" name="support-v4-21.0.3" level="project" />
diff --git a/app/build.gradle b/app/build.gradle
index c78a8786f..18a22e0f2 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -20,6 +20,7 @@ android {
 }
 
 dependencies {
-    compile fileTree(dir: 'libs', include: ['*.jar'])
     compile 'com.android.support:appcompat-v7:21.0.3'
+    compile 'com.intellij:annotations:12.0'
+    compile fileTree(dir: 'libs', include: ['*.jar'])
 }
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 056deeff6..fd56d05d0 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,18 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2015 Hippo Seven
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.hippo.ehviewer" >
 
diff --git a/app/src/main/java/com/hippo/ehviewer/client/DetailUrlParser.java b/app/src/main/java/com/hippo/ehviewer/client/DetailUrlParser.java
new file mode 100644
index 000000000..807653318
--- /dev/null
+++ b/app/src/main/java/com/hippo/ehviewer/client/DetailUrlParser.java
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2014-2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.ehviewer.client;
+
+import com.hippo.util.AssertUtils;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class DetailUrlParser {
+
+    public int gid;
+    public String token;
+
+    public void parser(String url) throws Exception {
+        AssertUtils.assertNotNull("Url is null when parse detail url", url);
+
+        Pattern p = Pattern.compile("/(\\d+)/(\\w+)");
+        Matcher m = p.matcher(url);
+        if (m.find()) {
+            gid = Integer.parseInt(m.group(1));
+            token = m.group(2);
+        } else {
+            throw new EhException("Can not parse detail url");
+        }
+    }
+}
diff --git a/app/src/main/java/com/hippo/ehviewer/client/EhClient.java b/app/src/main/java/com/hippo/ehviewer/client/EhClient.java
new file mode 100644
index 000000000..55df37691
--- /dev/null
+++ b/app/src/main/java/com/hippo/ehviewer/client/EhClient.java
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2014-2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.ehviewer.client;
+
+import android.os.AsyncTask;
+
+import com.hippo.ehviewer.data.GalleryInfo;
+import com.hippo.ehviewer.network.EhHttpHelper;
+import com.hippo.util.Utils;
+
+public class EhClient {
+
+    @SuppressWarnings("unused")
+    private static final String TAG = EhClient.class.getSimpleName();
+
+    public static final int SOURCE_G = 0x0;
+    public static final int SOURCE_EX = 0x1;
+    public static final int SOURCE_LOFI = 0x2;
+
+    public static final String API_G = "http://g.e-hentai.org/api.php";
+    public static final String API_EX = "http://exhentai.org/api.php";
+    public static final long APIUID = 1363542;
+    public static final String APIKEY = "f4b5407ab1727b9d08d7";
+
+    private static final String LOGIN_URL =
+            "http://forums.e-hentai.org/index.php?act=Login&CODE=01";
+    private static final String FORUMS_URL = "http://forums.e-hentai.org/index.php";
+
+    public static final String HEADER_G = "http://g.e-hentai.org/";
+    public static final String HEADER_EX = "http://exhentai.org/";
+    public static final String HEADER_LOFI = "http://lofi.e-hentai.org/";
+
+    public static final String API_EHVIEWER = "http://www.ehviewer.com/API";
+
+    /**
+     * Get gallery list
+     *
+     * @param source the source, one of {@link #SOURCE_G}, {@link #SOURCE_EX} and
+     *               {@link #SOURCE_LOFI}
+     * @param url the url to get gallery list
+     * @return a array with {@code GalleryInfo[]} gallery info array and
+     * {@code int} pages number
+     */
+    public Object[] doGetGalleryList(int source, String url) throws Exception {
+        EhHttpHelper ehh = new EhHttpHelper();
+        String body = ehh.get(url);
+
+        ListParser parser = new ListParser();
+        parser.parse(body, source);
+        return new Object[]{parser.giArray, parser.pageNum};
+    }
+
+    private void doBgJob(BgJobHelper bjh) {
+        Utils.execute(false, new AsyncTask<Object, Void, Object[]>() {
+            @Override
+            protected Object[] doInBackground(Object... params) {
+                BgJobHelper bjh = (BgJobHelper) params[0];
+                return new Object[]{bjh.doInBackground(), bjh};
+            }
+
+            @Override
+            protected void onPostExecute(Object[] resultPackage) {
+                Object result = resultPackage[0];
+                BgJobHelper bjh = (BgJobHelper) resultPackage[1];
+                bjh.onPostExecute(result);
+            }
+        }, bjh);
+    }
+
+    private static interface BgJobHelper {
+        public Object doInBackground();
+
+        public void onPostExecute(Object result);
+    }
+
+    public interface OnGetGalleryListListener {
+        public void onSuccess(GalleryInfo[] glArray, int pageNum);
+
+        public void onFailure(Exception e);
+    }
+
+}
diff --git a/app/src/main/java/com/hippo/ehviewer/client/EhException.java b/app/src/main/java/com/hippo/ehviewer/client/EhException.java
new file mode 100644
index 000000000..5fac6965d
--- /dev/null
+++ b/app/src/main/java/com/hippo/ehviewer/client/EhException.java
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.ehviewer.client;
+
+public class EhException extends Exception {
+
+    public EhException(String detailMessage) {
+        super(detailMessage);
+    }
+}
diff --git a/app/src/main/java/com/hippo/ehviewer/client/ListParser.java b/app/src/main/java/com/hippo/ehviewer/client/ListParser.java
new file mode 100644
index 000000000..429d7ee4a
--- /dev/null
+++ b/app/src/main/java/com/hippo/ehviewer/client/ListParser.java
@@ -0,0 +1,243 @@
+/*
+ * Copyright (C) 2014-2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.ehviewer.client;
+
+import com.hippo.ehviewer.data.GalleryInfo;
+import com.hippo.ehviewer.data.LofiGalleryInfo;
+import com.hippo.ehviewer.util.EhUtils;
+import com.hippo.util.AssertUtils;
+import com.hippo.util.NotEqualsException;
+import com.hippo.util.Utils;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class ListParser {
+    private static final String PARSE_MESSAGE = "Gallery list parser error";
+
+    private static final int DEFAULT_LIST_SIZE = 25;
+
+    public static final int CURRENT_PAGE_IS_LAST = -1;
+
+    /**
+     * If NOT FOUND, pageNum is 0.<br>
+     * For lofi, we can not get pages number,
+     * so pageNum is {@link java.lang.Integer#MAX_VALUE} when it is not the last page,
+     * pageNum is {@link #CURRENT_PAGE_IS_LAST} when it is the last page
+     */
+    public int pageNum;
+
+    public GalleryInfo[] giArray;
+
+    private void parse(String body) throws EhException {
+        Pattern p;
+        Matcher m;
+
+        // Get page number
+        p = Pattern.compile("<a[^<>]+>([\\d]+)</a></td><td[^<>]+>(?:<a[^<>]+>)?&");
+        m = p.matcher(body);
+        if (m.find()) {
+            pageNum = Integer.parseInt(m.group(1));
+        } else if (body.contains("No hits found</p>")) {
+            pageNum = 0;
+        } else {
+            // Can not get page number
+            throw new EhException(PARSE_MESSAGE);
+        }
+
+        // Get gallery
+        List<GalleryInfo> giList = new ArrayList<>(DEFAULT_LIST_SIZE);
+
+        p = Pattern.compile("<td class=\"itdc\">(?:<a.+?>)?<img.+?alt=\"(.+?)\".+?/>(?:</a>)?</td>" // category
+                + "<td.+?>(.+?)</td>" // posted
+                + "<td.+?><div.+?><div.+?height:(\\d+)px; width:(\\d+)px\">"
+                + "(?:<img.+?src=\"(.+?)\".+?alt=\"(.+?)\" style.+?/>"
+                + "|init~([^<>\"~]+~[^<>\"~]+)~([^<>]+))" // thumb and title
+                + "</div>"
+                + ".+?"
+                + "<div class=\"it5\"><a href=\"([^<>\"]+)\"[^<>]+>(.+?)</a></div>" // url and title
+                + ".+?"
+                + "<div class=\"ir it4r\" style=\"([^<>\"]+)\">" // rating
+                + ".+?"
+                + "<td class=\"itu\"><div><a.+?>(.+?)</a>"); // uploader
+        m = p.matcher(body);
+        while (m.find()) {
+            GalleryInfo gi = new GalleryInfo();
+
+            gi.category = EhUtils.getCategory(m.group(1));
+            gi.posted = m.group(2);
+            gi.thumbHeight = Integer.parseInt(m.group(3));
+            gi.thumbWidth = Integer.parseInt(m.group(4));
+
+            if (m.group(5) == null) {
+                gi.thumb = Utils.unescapeXml("http://"
+                        + m.group(7).replace('~', '/'));
+                gi.title = Utils.unescapeXml(m.group(8));
+            } else {
+                gi.thumb = Utils.unescapeXml(m.group(5));
+                gi.title = Utils.unescapeXml(m.group(6));
+            }
+
+            Pattern pattern = Pattern
+                    .compile("/(\\d+)/(\\w+)");
+            Matcher matcher = pattern.matcher(m.group(9));
+            if (matcher.find()) {
+                gi.gid = Integer.parseInt(matcher.group(1));
+                gi.token = matcher.group(2);
+            } else {
+                continue;
+            }
+
+            gi.rating = Utils.parseFloatSafely(getRate(m.group(11)), Float.NaN);
+            gi.uploader = m.group(12);
+            gi.generateSLang();
+
+            giList.add(gi);
+        }
+
+        if (giList.size() == 0) {
+            throw new EhException(PARSE_MESSAGE);
+        }
+
+        giArray = giList.toArray(new GalleryInfo[giList.size()]);
+    }
+
+    private void parseLofi(String body) throws Exception {
+        Pattern p;
+        Matcher m;
+
+        // Get gallery
+        List<LofiGalleryInfo> lgiList = new ArrayList<>(DEFAULT_LIST_SIZE);
+        p = Pattern.compile("<td class=\"ii\"><a href=\"(.+?)\">" // detail url
+                + "<img src=\"(.+?)\".+?/>" // thumb url
+                + ".+?<a class=\"b\" href=\".+?\">(.+?)</a>" // title
+                + ".+?<td class=\"ik ip\">Posted:</td><td class=\"ip\">(.+?)</td>" // Posted and uploader
+                + "</tr><tr><td class=\"ik\">Category:</td><td>(.+?)</td>" // Category
+                + "</tr><tr><td class=\"ik\">Tags:</td><td>(.+?)</td>" // Tags
+                + "</tr><tr><td class=\"ik\">Rating:</td><td class=\"ir\">(.+?)</td>"); // rating
+        m = p.matcher(body);
+        DetailUrlParser dup = new DetailUrlParser();
+        String[] pau = new String[2];
+        while (m.find()) {
+            LofiGalleryInfo lgi = new LofiGalleryInfo();
+
+            dup.parser(m.group(1));
+            lgi.gid = dup.gid;
+            lgi.token = dup.token;
+
+            lgi.thumb = Utils.unescapeXml(m.group(2));
+            lgi.title = Utils.unescapeXml(m.group(3));
+
+            getPostedAndUploader(m.group(4), pau);
+            lgi.posted = pau[0];
+            lgi.uploader = pau[1];
+
+            lgi.category = EhUtils.getCategory(m.group(5));
+            String tags = m.group(6);
+            if (tags.equals("-"))
+                lgi.lofiTags = new String[0];
+            else
+                lgi.lofiTags = tags.split(", ");
+            String rating = m.group(7);
+            if (rating.equals("-"))
+                lgi.rating = Float.NaN;
+            else
+                lgi.rating = getStartNum(rating);
+            lgi.generateSLang();
+
+            lgiList.add(lgi);
+        }
+
+        if (lgiList.size() == 0) {
+            if (body.contains("No hits found</div>")) {
+                pageNum = 0;
+            } else if (body.contains("No more hits found</div>")) {
+                throw new EhException("Index is out of range");
+            } else {
+                throw new EhException(PARSE_MESSAGE);
+            }
+        } else {
+            if (!body.contains("Next Page &gt;</a>")) {
+                pageNum = CURRENT_PAGE_IS_LAST;
+            } else {
+                pageNum = Integer.MAX_VALUE;
+            }
+        }
+    }
+
+    public void parse(String body, int source) throws Exception {
+        AssertUtils.assertNotNull("Body is null when parse gallery list", body);
+
+        switch (source) {
+            default:
+            case EhClient.SOURCE_G:
+            case EhClient.SOURCE_EX: {
+                parse(body);
+                break;
+            }
+            case EhClient.SOURCE_LOFI: {
+                parseLofi(body);
+                break;
+            }
+        }
+    }
+
+    private String getRate(String rawRate) {
+        Pattern p = Pattern.compile("\\d+px");
+        Matcher m = p.matcher(rawRate);
+        int num1;
+        int num2;
+        int rate = 5;
+        String re;
+        if (m.find())
+            num1 = Integer.parseInt(m.group().replace("px", ""));
+        else
+            return null;
+        if (m.find())
+            num2 = Integer.parseInt(m.group().replace("px", ""));
+        else
+            return null;
+        rate = rate - num1 / 16;
+        if (num2 == 21) {
+            rate--;
+            re = Integer.toString(rate);
+            re = re + ".5";
+        } else
+            re = Integer.toString(rate);
+        return re;
+    }
+
+    private static final String PAU_SPACER = " by ";
+
+    private void getPostedAndUploader(String raw, String[] pau)
+            throws NotEqualsException {
+        int index = raw.indexOf(PAU_SPACER);
+        AssertUtils.assertEquals("Can not parse posted and uploader", index, -1);
+        pau[0] = raw.substring(0, index);
+        pau[1] = raw.substring(index + PAU_SPACER.length());
+    }
+
+    private int getStartNum(String str) {
+        int startNum = 0;
+        for (int i = 0; i < str.length(); i++) {
+            if (str.charAt(i) == '*')
+                startNum++;
+        }
+        return startNum;
+    }
+}
diff --git a/app/src/main/java/com/hippo/ehviewer/data/GalleryInfo.java b/app/src/main/java/com/hippo/ehviewer/data/GalleryInfo.java
new file mode 100644
index 000000000..adc518dae
--- /dev/null
+++ b/app/src/main/java/com/hippo/ehviewer/data/GalleryInfo.java
@@ -0,0 +1,174 @@
+/*
+ * Copyright (C) 2014-2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.ehviewer.data;
+
+import android.os.Parcel;
+import android.os.Parcelable;
+
+import java.util.regex.Pattern;
+
+public class GalleryInfo implements Parcelable {
+
+    /**
+     * ISO 639-1
+     */
+    @SuppressWarnings("unused")
+    public static final String S_LANG_JA = "JA";
+    public static final String S_LANG_EN = "EN";
+    public static final String S_LANG_ZH = "ZH";
+    public static final String S_LANG_NL = "NL";
+    public static final String S_LANG_FR = "FR";
+    public static final String S_LANG_DE = "DE";
+    public static final String S_LANG_HU = "HU";
+    public static final String S_LANG_IT = "IT";
+    public static final String S_LANG_KO = "KO";
+    public static final String S_LANG_PL = "PL";
+    public static final String S_LANG_PT = "PT";
+    public static final String S_LANG_RU = "RU";
+    public static final String S_LANG_ES = "ES";
+    public static final String S_LANG_TH = "TH";
+    public static final String S_LANG_VI = "VI";
+
+    public static final String[] S_LANGS = {
+        S_LANG_EN,
+        S_LANG_ZH,
+        S_LANG_ES,
+        S_LANG_KO,
+        S_LANG_RU,
+        S_LANG_FR,
+        S_LANG_PT,
+        S_LANG_TH,
+        S_LANG_DE,
+        S_LANG_IT,
+        S_LANG_VI,
+        S_LANG_PL,
+        S_LANG_HU,
+        S_LANG_NL,
+    };
+
+    public static final String[] S_LANG_PATTERNS = {
+        "[(\\[]eng(?:lish)?[)\\]]",
+        "[(（\\[]chinese[)）\\]]|[汉漢]化|中[国國][语語]|中文|[(\\[]CN[)\\]]",
+        "[(\\[]spanish[)\\]]|[(\\[]Español[)\\]]",
+        "[(\\[]korean?[)\\]]",
+        "[(\\[]rus(?:sian)?[)\\]]",
+        "[(\\[]fr(?:ench)?[)\\]]",
+        "[(\\[]portuguese",
+        "[(\\[]thai(?: ภาษาไทย)?[)\\]]",
+        "[(\\[]german[)\\]]",
+        "[(\\[]italiano?[)\\]]",
+        "[(\\[]vietnamese(?: Tiếng Việt)?[)\\]]",
+        "[(\\[]polish[)\\]]",
+        "[(\\[]hun(?:garian)?[)\\]]",
+        "[(\\[]dutch[)\\]]",
+    };
+
+    public int gid;
+    public String token;
+    public String title;
+    public String posted;
+    public int category;
+    public String thumb;
+    public String uploader;
+    public float rating;
+    /**
+     * Will not be recond
+     */
+    public int thumbWidth;
+    /**
+     * Will not be recond
+     */
+    public int thumbHeight;
+    /**
+     * language get from title
+     */
+    public String simpleLanguage;
+
+    public static final Creator<GalleryInfo> CREATOR =
+            new Creator<GalleryInfo>() {
+                @Override
+                public GalleryInfo createFromParcel(Parcel source) {
+                    GalleryInfo p = new GalleryInfo();
+                    p.gid = source.readInt();
+                    p.token = source.readString();
+                    p.title = source.readString();
+                    p.posted = source.readString();
+                    p.category = source.readInt();
+                    p.thumb = source.readString();
+                    p.uploader = source.readString();
+                    p.rating = source.readFloat();
+                    p.simpleLanguage = source.readString();
+                    return p;
+                }
+
+                @Override
+                public GalleryInfo[] newArray(int size) {
+                    return new GalleryInfo[size];
+                }
+    };
+
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+
+    @Override
+    public void writeToParcel(Parcel dest, int flags) {
+        dest.writeInt(gid);
+        dest.writeString(token);
+        dest.writeString(title);
+        dest.writeString(posted);
+        dest.writeInt(category);
+        dest.writeString(thumb);
+        dest.writeString(uploader);
+        dest.writeFloat(rating);
+        dest.writeString(simpleLanguage);
+    }
+
+    public GalleryInfo() {
+        // Empty
+    }
+
+    public GalleryInfo(GalleryInfo gi) {
+        gid = gi.gid;
+        token = gi.token;
+        title = gi.title;
+        posted = gi.posted;
+        category = gi.category;
+        thumb = gi.thumb;
+        uploader = gi.uploader;
+        rating = gi.rating;
+        simpleLanguage = gi.simpleLanguage;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (o instanceof GalleryInfo && ((GalleryInfo) o).gid == gid)
+            return true;
+        else
+            return false;
+    }
+
+    public final void generateSLang() {
+        for (int i = 0; i < S_LANGS.length; i++) {
+            if (Pattern.compile(S_LANG_PATTERNS[i], Pattern.CASE_INSENSITIVE).matcher(title).find()) {
+                simpleLanguage = S_LANGS[i];
+                return;
+            }
+        }
+        simpleLanguage = null;
+    }
+}
diff --git a/app/src/main/java/com/hippo/ehviewer/data/ListUrlBuilder.java b/app/src/main/java/com/hippo/ehviewer/data/ListUrlBuilder.java
new file mode 100644
index 000000000..555a62520
--- /dev/null
+++ b/app/src/main/java/com/hippo/ehviewer/data/ListUrlBuilder.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2014-2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.ehviewer.data;
+
+public class ListUrlBuilder {
+
+}
diff --git a/app/src/main/java/com/hippo/ehviewer/data/LofiGalleryInfo.java b/app/src/main/java/com/hippo/ehviewer/data/LofiGalleryInfo.java
new file mode 100644
index 000000000..3b79db210
--- /dev/null
+++ b/app/src/main/java/com/hippo/ehviewer/data/LofiGalleryInfo.java
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2014-2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.ehviewer.data;
+
+import android.os.Parcel;
+
+import org.jetbrains.annotations.NotNull;
+
+public class LofiGalleryInfo extends GalleryInfo {
+
+    public @NotNull String[] lofiTags;
+
+    public static final Creator<LofiGalleryInfo> CREATOR =
+            new Creator<LofiGalleryInfo>() {
+                @Override
+                public LofiGalleryInfo createFromParcel(Parcel source) {
+                    int length;
+
+                    LofiGalleryInfo p = new LofiGalleryInfo();
+                    p.gid = source.readInt();
+                    p.token = source.readString();
+                    p.title = source.readString();
+                    p.posted = source.readString();
+                    p.category = source.readInt();
+                    p.thumb = source.readString();
+                    p.uploader = source.readString();
+                    p.rating = source.readFloat();
+                    p.simpleLanguage = source.readString();
+
+                    length = source.readInt();
+                    p.lofiTags = new String[length];
+                    for (int i = 0; i < length; i++)
+                        p.lofiTags[i] = source.readString();
+
+                    return p;
+                }
+
+                @Override
+                public LofiGalleryInfo[] newArray(int size) {
+                    return new LofiGalleryInfo[size];
+                }
+    };
+
+    public LofiGalleryInfo() {}
+
+    public LofiGalleryInfo(GalleryInfo galleryInfo) {
+        gid = galleryInfo.gid;
+        token = galleryInfo.token;
+        title = galleryInfo.title;
+        posted = galleryInfo.posted;
+        category = galleryInfo.category;
+        thumb = galleryInfo.thumb;
+        uploader = galleryInfo.uploader;
+        rating = galleryInfo.rating;
+        simpleLanguage = galleryInfo.simpleLanguage;
+        lofiTags = new String[0];
+    }
+
+    @Override
+    public void writeToParcel(Parcel dest, int flags) {
+        super.writeToParcel(dest, flags);
+
+        int length = lofiTags == null ? 0 : lofiTags.length;
+        dest.writeInt(length);
+        for (int i = 0; i < length; i++)
+            dest.writeString(lofiTags[i]);
+    }
+}
diff --git a/app/src/main/java/com/hippo/ehviewer/network/EhHttpHelper.java b/app/src/main/java/com/hippo/ehviewer/network/EhHttpHelper.java
new file mode 100644
index 000000000..2625ee3c6
--- /dev/null
+++ b/app/src/main/java/com/hippo/ehviewer/network/EhHttpHelper.java
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.ehviewer.network;
+
+import com.hippo.network.HttpHelper;
+
+import java.net.HttpURLConnection;
+import java.net.URL;
+
+public class EhHttpHelper extends HttpHelper {
+
+    @Override
+    protected String getCookie(URL url) {
+        return super.getCookie(url);
+    }
+
+    @Override
+    protected void storeCookie(URL url, String value) {
+        super.storeCookie(url, value);
+    }
+
+    @Override
+    protected void onBeforeConnect(HttpURLConnection conn) {
+        super.onBeforeConnect(conn);
+    }
+}
diff --git a/app/src/main/java/com/hippo/ehviewer/util/EhUtils.java b/app/src/main/java/com/hippo/ehviewer/util/EhUtils.java
new file mode 100644
index 000000000..87c84970c
--- /dev/null
+++ b/app/src/main/java/com/hippo/ehviewer/util/EhUtils.java
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2014-2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.ehviewer.util;
+
+public final class EhUtils {
+
+    public static final String EH_DOWNLOAD_FILENAME = ".ehviewer";
+
+    public static final int NONE = -1; // Use it for homepage
+    public static final int MISC = 0x1;
+    public static final int DOUJINSHI = 0x2;
+    public static final int MANGA = 0x4;
+    public static final int ARTIST_CG = 0x8;
+    public static final int GAME_CG = 0x10;
+    public static final int IMAGE_SET = 0x20;
+    public static final int COSPLAY = 0x40;
+    public static final int ASIAN_PORN = 0x80;
+    public static final int NON_H = 0x100;
+    public static final int WESTERN = 0x200;
+    public static final int UNKNOWN = 0x400;
+
+    private static final int[] CATEGORY_VALUES = {
+            MISC,
+            DOUJINSHI,
+            MANGA,
+            ARTIST_CG,
+            GAME_CG,
+            IMAGE_SET,
+            COSPLAY,
+            ASIAN_PORN,
+            NON_H,
+            WESTERN,
+            UNKNOWN };
+
+    private static final String[][] CATEGORY_STRINGS = {
+            new String[] { "misc" },
+            new String[] { "doujinshi" },
+            new String[] { "manga" },
+            new String[] { "artistcg", "Artist CG Sets" },
+            new String[] { "gamecg", "Game CG Sets" },
+            new String[] { "imageset", "Image Sets" },
+            new String[] { "cosplay" },
+            new String[] { "asianporn", "Asian Porn" },
+            new String[] { "non-h" },
+            new String[] { "western" },
+            new String[] { "unknown" }
+    };
+
+    public static int getCategory(String type) {
+        int i;
+        for (i = 0; i < CATEGORY_STRINGS.length - 1; i++) {
+            for (String str : CATEGORY_STRINGS[i])
+                if (str.equalsIgnoreCase(type))
+                    return CATEGORY_VALUES[i];
+        }
+
+        return CATEGORY_VALUES[i];
+    }
+
+    public static String getCategory(int type) {
+        int i;
+        for (i = 0; i < CATEGORY_VALUES.length - 1; i++) {
+            if (CATEGORY_VALUES[i] == type)
+                break;
+        }
+        return CATEGORY_STRINGS[i][0];
+    }
+
+
+}
diff --git a/app/src/main/java/com/hippo/network/HttpHelper.java b/app/src/main/java/com/hippo/network/HttpHelper.java
new file mode 100644
index 000000000..df88b086f
--- /dev/null
+++ b/app/src/main/java/com/hippo/network/HttpHelper.java
@@ -0,0 +1,899 @@
+/*
+ * Copyright (C) 2014-2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.network;
+
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.util.Log;
+import android.webkit.CookieManager;
+import android.webkit.MimeTypeMap;
+
+import com.hippo.util.FastByteArrayOutputStream;
+import com.hippo.util.Utils;
+
+import org.json.JSONObject;
+
+import java.io.ByteArrayOutputStream;
+import java.io.DataOutputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.HttpURLConnection;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.net.URLConnection;
+import java.net.URLEncoder;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.zip.GZIPInputStream;
+
+/**
+ * It is not thread safe
+ */
+public class HttpHelper {
+    private static final String TAG = HttpHelper.class.getSimpleName();
+
+    private static final int MAX_RETRY = 3;
+    private static final int MAX_REDIRECTS = 3;
+    private static final int CONNECT_TIMEOUT = 5000;
+    private static final int READ_TIMEOUT = 5000;
+
+    public static final String DEFAULT_USER_AGENT =
+            "Mozilla/5.0 (Windows NT 6.1; WOW64) " +
+            "AppleWebKit/537.36 (KHTML, like Gecko) " +
+            "Chrome/39.0.2171.95 Safari/537.36";
+    public static final String USER_AGENT =
+            System.getProperty("http.agent", DEFAULT_USER_AGENT);
+
+    private static final int HTTP_TEMP_REDIRECT = 307;
+
+    private static final String DEFAULT_CHARSET = "utf-8";
+    private static final String CHARSET_KEY = "charset=";
+
+    private static final CookieManager sCookieManager = CookieManager.getInstance();
+
+    private int mResponseCode = -1;
+
+    public void reset() {
+        mResponseCode = -1;
+    }
+
+    public int getResponseCode() {
+        return mResponseCode;
+    }
+
+    /**
+     * Get cookie for the url
+     * @param url the URL
+     * @return the cookie for the URL
+     */
+    protected String getCookie(URL url) {
+        return sCookieManager.getCookie(url.toString());
+    }
+
+    /**
+     * Store cookie for the url
+     * @param url the URL
+     * @param value the cookie for the URL
+     */
+    protected void storeCookie(URL url, String value) {
+        sCookieManager.setCookie(url.toString(), value);
+    }
+
+    /**
+     * Prepare before connecting
+     * @param conn the connection
+     */
+    protected void onBeforeConnect(HttpURLConnection conn) {
+        conn.setInstanceFollowRedirects(true);
+        conn.setRequestProperty("User-Agent", USER_AGENT);
+        conn.setConnectTimeout(CONNECT_TIMEOUT);
+        conn.setReadTimeout(READ_TIMEOUT);
+    }
+
+    private Object doRequst(RequestHelper rh) throws Exception {
+        URL url;
+        HttpURLConnection conn = null;
+        int redirectionCount = 0;
+        try {
+            url = rh.getUrl();
+            while (redirectionCount++ < MAX_REDIRECTS) {
+                Log.d(TAG, "Request: " + url.toString());
+                conn = (HttpURLConnection) url.openConnection();
+                // Prepare before connecting
+                onBeforeConnect(conn);
+                // Set cookie
+                String cookie = getCookie(url);
+                if (cookie != null) {
+                    conn.setRequestProperty("Cookie", cookie);
+                }
+                // Do custom staff
+                rh.onBeforeConnect(conn);
+
+                conn.connect();
+                // Store cookie
+                List<String> cookieList = conn.getHeaderFields().get("Set-Cookie");
+                if (cookieList != null) {
+                    for (String cookieTemp : cookieList) {
+                        if (cookieTemp != null) {
+                            storeCookie(url, cookieTemp);
+                        }
+                    }
+                }
+                final int responseCode = conn.getResponseCode();
+                mResponseCode = responseCode;
+                Log.d(TAG, "Response code: " + responseCode);
+                switch (responseCode) {
+                case HttpURLConnection.HTTP_MOVED_PERM:
+                case HttpURLConnection.HTTP_MOVED_TEMP:
+                case HttpURLConnection.HTTP_SEE_OTHER:
+                case HTTP_TEMP_REDIRECT:
+                    final String location = conn.getHeaderField("Location");
+                    Log.d(TAG, "New location: " + location);
+                    conn.disconnect();
+                    url = new URL(url, location);
+                    break;
+                default:
+                    return rh.onAfterConnect(conn);
+                }
+            }
+        } finally {
+            if (conn != null)
+                conn.disconnect();
+        }
+
+        throw new RedirectionException();
+    }
+
+    private Object requst(RequestHelper rh) throws Exception {
+        Exception exception = null;
+        for (int times = 0;
+                times < MAX_RETRY &&(times == 0 || rh.onRetry(exception));
+                times++) {
+            try {
+                return doRequst(rh);
+            } catch (Exception e) {
+                exception = e;
+            }
+        }
+
+        rh.onRequestFailed(exception);
+
+        throw exception;
+    }
+
+    public static interface RequestHelper {
+
+        /**
+         * Get the URL to connect
+         * @return the URL to connect
+         */
+        public URL getUrl() throws MalformedURLException;
+
+        /**
+         * Add header or do something else for HttpURLConnection before connect
+         *
+         * @param conn the connection
+         * @throws Exception
+         */
+
+        public void onBeforeConnect(HttpURLConnection conn) throws Exception;
+
+        /**
+         * Get what do you need from HttpURLConnection after connect
+         * Return null means get error
+         *
+         * @param conn the connection
+         * @return what you want to return
+         * @throws Exception
+         */
+        public Object onAfterConnect(HttpURLConnection conn) throws Exception;
+
+        /**
+         * Retry http connecting, or stop
+         *
+         * @param previousException previous thrown
+         * @return true for retry, false for stop
+         */
+        public boolean onRetry(Exception previousException);
+
+        /**
+         * Called when request failed by exception
+         */
+        public void onRequestFailed(Exception exception);
+    }
+
+    public static abstract class GetStringHelper implements RequestHelper {
+        private final String mUrl;
+
+        public GetStringHelper(String url) {
+            mUrl = url;
+        }
+
+        @Override
+        public URL getUrl() throws MalformedURLException {
+            return new URL(mUrl);
+        }
+
+        @Override
+        public void onBeforeConnect(HttpURLConnection conn)
+                throws Exception {
+            conn.addRequestProperty("Accept-Encoding", "gzip");
+        }
+
+        private String getCharsetFromContentType(String contentType) {
+            if (contentType == null) {
+                return null;
+            }
+
+            String[] values = contentType.split(";");
+            for (String value : values) {
+                value = value.trim();
+
+                if (value.toLowerCase().startsWith(CHARSET_KEY)) {
+                    return value.substring(CHARSET_KEY.length());
+                }
+            }
+
+            return null;
+        }
+
+        private String getBody(HttpURLConnection conn)
+                throws Exception {
+            String body = null;
+            InputStream is = null;
+            ByteArrayOutputStream baos = null;
+            try {
+                try {
+                    // First try to get input stream
+                    is = conn.getInputStream();
+                } catch (Exception t){
+                    // If we get error, get error stream
+                    is = conn.getErrorStream();
+                }
+                String encoding = conn.getContentEncoding();
+                if (encoding != null && encoding.equalsIgnoreCase("gzip"))
+                    is = new GZIPInputStream(is);
+
+                int length = conn.getContentLength();
+                if (length >= 0)
+                    baos = new ByteArrayOutputStream(length);
+                else
+                    baos = new ByteArrayOutputStream();
+
+                Utils.copy(is, baos);
+
+                // Get charset
+                String charset = getCharsetFromContentType(conn.getContentType());
+                if (charset == null) {
+                    charset = DEFAULT_CHARSET;
+                }
+
+                body = baos.toString(charset);
+
+            } finally {
+                Utils.closeQuietly(is);
+                Utils.closeQuietly(baos);
+            }
+
+            return body;
+        }
+
+        @Override
+        public Object onAfterConnect(HttpURLConnection conn)
+                throws Exception {
+            return getBody(conn);
+        }
+
+        @Override
+        public boolean onRetry(Exception previousException) {
+            // Do not care about exception, just retry
+            return true;
+        }
+
+        @Override
+        public void onRequestFailed(Exception exception) {
+            // Empty
+        }
+    }
+
+    /**
+     * RequstHelper for GET method
+     */
+    public static class GetHelper extends GetStringHelper {
+
+        public GetHelper(String url) {
+            super(url);
+        }
+
+        @Override
+        public void onBeforeConnect(HttpURLConnection conn)
+                throws Exception {
+            super.onBeforeConnect(conn);
+            conn.setRequestMethod("GET");
+        }
+    }
+
+    /**
+     * RequstHelper for post form data, use POST method
+     */
+    public static class PostFormHelper extends GetStringHelper {
+        private final String[][] mArgs;
+
+        public PostFormHelper(String url, String[][] args) {
+            super(url);
+            mArgs = args;
+        }
+
+        @Override
+        public void onBeforeConnect(HttpURLConnection conn)
+                throws Exception {
+            super.onBeforeConnect(conn);
+            conn.setDoOutput(true);
+            conn.setDoInput(true);
+            conn.setUseCaches(false);
+            conn.setRequestMethod("POST");
+            conn.setRequestProperty("Content-Type",
+                    "application/x-www-form-urlencoded");
+
+            DataOutputStream out = new DataOutputStream(conn.getOutputStream());
+            StringBuilder sb = new StringBuilder();
+            int i = 0;
+            for (String[] arg : mArgs) {
+                if (i != 0)
+                    sb.append("&");
+                sb.append(URLEncoder.encode(arg[0], "UTF-8"));
+                sb.append("=");
+                sb.append(URLEncoder.encode(arg[1], "UTF-8"));
+                i++;
+            }
+            out.writeBytes(sb.toString());
+            out.flush();
+            out.close();
+        }
+    }
+
+    /**
+     * RequstHelper for post json, use POST method
+     */
+    public static class PostJsonHelper extends GetStringHelper {
+        private final JSONObject mJo;
+
+        public PostJsonHelper(String url, JSONObject jo) {
+            super(url);
+            mJo = jo;
+        }
+
+        @Override
+        public void onBeforeConnect(HttpURLConnection conn) throws Exception {
+            super.onBeforeConnect(conn);
+            conn.setDoOutput(true);
+            conn.setDoInput(true);
+            conn.setUseCaches(false);
+            conn.setRequestMethod("POST");
+            conn.setRequestProperty("Content-Type", "application/json");
+
+            DataOutputStream out = new DataOutputStream(conn.getOutputStream());
+            String body = mJo.toString();
+            Log.d(TAG, "Post json: " + body);
+            out.writeBytes(body);
+            out.flush();
+            out.close();
+        }
+    }
+
+    public abstract static class FormData {
+        private final Map<String, String> mProperties;
+
+        public FormData() {
+            mProperties = new LinkedHashMap<String, String>();
+        }
+
+        public void setProperty(String key, String value) {
+            mProperties.put(key, value);
+        }
+
+        public void clearProperty(String key) {
+            mProperties.remove(key);
+        }
+
+        public void clearAllProperties() {
+            mProperties.clear();
+        }
+
+        /**
+         * Put information to target OutputStream.
+         *
+         * @param os target outputStream
+         * @throws java.io.IOException
+         */
+        public abstract void output(OutputStream os) throws IOException;
+
+        public void doOutPut(OutputStream os) throws IOException {
+            StringBuilder sb = new StringBuilder();
+            for (String key : mProperties.keySet())
+                sb.append(key).append(": ").append(mProperties.get(key)).append("\r\n");
+            sb.append("\r\n");
+            os.write(sb.toString().getBytes());
+            output(os);
+        }
+    }
+
+    public static class StringData extends FormData {
+        private final String mStr;
+
+        public StringData(String str) {
+            mStr = str;
+        }
+
+        @Override
+        public void output(OutputStream os) throws IOException {
+            os.write(mStr.getBytes());
+            os.write("\r\n".getBytes());
+        }
+    }
+
+    public static class BitmapData extends FormData {
+        private final Bitmap mBitmap;
+
+        public BitmapData(Bitmap bmp) {
+            mBitmap = bmp;
+            setProperty("Content-Type", "image/jpeg");
+        }
+
+        @Override
+        public void output(OutputStream os) throws IOException {
+            mBitmap.compress(Bitmap.CompressFormat.JPEG, 98, os);
+            os.write("\r\n".getBytes());
+        }
+    }
+
+    public static class FileData extends FormData {
+        private final File mFile;
+
+        public FileData(File file) {
+            mFile = file;
+            setProperty("Content-Type",
+                    URLConnection.guessContentTypeFromName(file.getName()));
+        }
+
+        @Override
+        public void output(OutputStream os) throws IOException {
+            InputStream is = new FileInputStream(mFile);
+            byte[] buffer = new byte[1024];
+            int bytesRead;
+            while((bytesRead = is.read(buffer)) !=-1)
+                os.write(buffer, 0, bytesRead);
+            is.close();
+
+            os.write("\r\n".getBytes());
+        }
+    }
+
+    public static class PostFormDataHelper extends GetStringHelper {
+        private static final String BOUNDARY = "------WebKitFormBoundary7eDB0hDQ91s22Tkf";
+
+        private final List<FormData> mDataList;
+
+
+        public PostFormDataHelper(String url, List<FormData> dataList) {
+            super(url);
+            mDataList = dataList;
+        }
+
+        @Override
+        public void onBeforeConnect(HttpURLConnection conn) throws Exception {
+            super.onBeforeConnect(conn);
+            conn.setDoOutput(true);
+            conn.setDoInput(true);
+            conn.setUseCaches(false);
+            conn.setRequestMethod("POST");
+            conn.setRequestProperty("Content-Type",
+                    "multipart/form-data; boundary=----WebKitFormBoundary7eDB0hDQ91s22Tkf");
+
+            DataOutputStream out = new DataOutputStream(conn.getOutputStream());
+
+            for (FormData data : mDataList) {
+                out.write(BOUNDARY.getBytes());
+                out.write("\r\n".getBytes());
+                data.doOutPut(out);
+            }
+            out.write(BOUNDARY.getBytes());
+            out.write("--".getBytes());
+
+            out.flush();
+            out.close();
+        }
+    }
+
+    public static class GetImageHelper implements RequestHelper {
+        private final String mUrl;
+
+        public GetImageHelper(String url) {
+            mUrl = url;
+        }
+
+        @Override
+        public URL getUrl() throws MalformedURLException {
+            return new URL(mUrl);
+        }
+
+        @Override
+        public void onBeforeConnect(HttpURLConnection conn)
+                throws Exception {
+            conn.setRequestMethod("GET");
+        }
+
+        @Override
+        public Object onAfterConnect(HttpURLConnection conn)
+                throws Exception {
+            // If just
+            // Bitmap bmp = BitmapFactory.decodeStream(conn.getInputStream(), null, Ui.getBitmapOpt());
+            // bitmap might be incomplete.
+            int size = conn.getContentLength();
+            ByteArrayOutputStream a;
+            FastByteArrayOutputStream fbaos = new FastByteArrayOutputStream(size == -1 ? 24 * 1024 : (size + 100));
+            Utils.copy(conn.getInputStream(), fbaos);
+            Bitmap bmp = BitmapFactory.decodeByteArray(fbaos.getBuffer(), 0, fbaos.size(), null);
+
+            if (bmp == null) {
+                throw new IllegalStateException("Can not decode to bitmap.");
+            }
+            return bmp;
+        }
+
+        @Override
+        public boolean onRetry(Exception previousException) {
+            // Do not care about exception, just retry
+            return true;
+        }
+
+        @Override
+        public void onRequestFailed(Exception exception) {
+            // Empty
+        }
+    }
+
+    public static interface OnDownloadListener {
+
+        /**
+         * Called before connecting
+         */
+        public void onStartConnecting();
+
+        /**
+         * Called after connecting and before downloading
+         *
+         * @param totalSize content length, -1 for unknown
+         */
+        public void onStartDownloading(int totalSize);
+
+        /**
+         * File name is fixed
+         *
+         * @param newName new file name
+         */
+        public void onNameFix(String newName);
+
+        /**
+         * Called repeatedly during downloading
+         *
+         * @param downloadSize downloaded size
+         * @param totalSize content length, -1 for unknown
+         */
+        public void onDownload(int downloadSize, int totalSize);
+
+        /**
+         * Called when download ok
+         */
+        public void onSuccess();
+
+        /**
+         * Called when download stop
+         */
+        public void onStop();
+
+        /**
+         * Called when download failed
+         *
+         * @param e the exception why fail
+         */
+        public void onFailure(Exception e);
+    }
+
+    public static class DownloadControlor {
+        private boolean mStop = false;
+
+        public void stop() {
+            mStop = true;
+        }
+
+        public void reset() {
+            mStop = false;
+        }
+
+        public boolean isStop() {
+            return mStop;
+        }
+    }
+
+    public static class DownloadHelper implements RequestHelper {
+
+        private static final String DOWNLOAD_EXTENSION = ".download";
+
+        private final String mUrl;
+        private final File mDir;
+        private String mFileName;
+        private File mFile;
+        private File mTempFile;
+        private final DownloadControlor mControlor;
+        private final OnDownloadListener mListener;
+        private int mContentLength;
+        private int mReceivedSize;
+
+        public DownloadHelper(String url, File dir, String fileName,
+                DownloadControlor controlor, OnDownloadListener listener) {
+            mUrl = url;
+            mDir = dir;
+            mFileName = fileName;
+            mControlor = controlor;
+            mListener = listener;
+        }
+
+        @Override
+        public URL getUrl() throws MalformedURLException {
+            return new URL(mUrl);
+        }
+
+        private void checkStop() throws StopRequestException {
+            if (mControlor != null && mControlor.isStop()) {
+                throw new StopRequestException();
+            }
+        }
+
+        @Override
+        public void onBeforeConnect(HttpURLConnection conn) throws Exception {
+            checkStop();
+
+            conn.setRequestMethod("GET");
+            // Sometimes for application/octet-stream, we need to add this line
+            // to get content length
+            conn.setRequestProperty("Range", "bytes=0-");
+
+            if (mListener != null) {
+                mListener.onStartConnecting();
+            }
+        }
+
+        private int getContentLength(HttpURLConnection conn) {
+            int contentLength = conn.getContentLength();
+            String range;
+            if (contentLength == -1 &&
+                    (range = conn.getHeaderField("Content-Range")) != null) {
+                // Content-Range looks like bytes 500-999/1234
+                contentLength = 0;
+                int step = 0;
+                boolean isNum = false;
+                char ch;
+                for (int i = 0; i < range.length(); i++) {
+                    ch = range.charAt(i);
+                    if (ch >= '0' && ch <= '9') {
+                        if (!isNum) {
+                            isNum = true;
+                            step++;
+                        }
+                    } else {
+                        isNum = false;
+                    }
+                    if (isNum && step == 3) {
+                        contentLength = contentLength * 10 + ch - '0';
+                    }
+                }
+            }
+            return contentLength;
+        }
+
+        /**
+         * Get new extension
+         *
+         * @param ext new extension
+         * @return null for not changed
+         */
+        protected String fixNewExtension(String ext) {
+            return null;
+        }
+
+        @Override
+        public Object onAfterConnect(HttpURLConnection conn) throws Exception {
+            // Check stop
+            if (mControlor != null && mControlor.isStop())
+                throw new StopRequestException();
+
+            String contentType = conn.getContentType();
+            int index = contentType.indexOf(';');
+            if (index != -1)
+                contentType = contentType.substring(0, index);
+
+            mContentLength = getContentLength(conn);
+            if (mListener != null) {
+                mListener.onStartDownloading(mContentLength);
+            }
+
+            // Fix extension
+            MimeTypeMap mime = MimeTypeMap.getSingleton();
+            String newExtension = mime.getExtensionFromMimeType(contentType);
+            if (newExtension == null) {
+                index = contentType.lastIndexOf('/');
+                if (index != -1) {
+                    newExtension = contentType.substring(index + 1);
+                }
+            }
+            newExtension = fixNewExtension(newExtension);
+            if (newExtension != null) {
+                index = mFileName.lastIndexOf('.');
+                if (index == -1) {
+                    mFileName = mFileName + '.' + newExtension;
+                } else {
+                    mFileName = mFileName.substring(0, index) + '.' + newExtension;
+                }
+            }
+
+            // Make sure parent exist
+            if (!mDir.mkdirs() && !mDir.isDirectory()) {
+                throw new FileNotFoundException("Can not create dir " +
+                        mDir.getPath());
+            }
+
+            mFile = new File(mDir, mFileName);
+            mTempFile = new File(mDir, mFileName + DOWNLOAD_EXTENSION);
+
+            // Transfer
+            transferData(conn.getInputStream(), new FileOutputStream(mTempFile));
+
+            // Get ok, rename
+            Utils.deleteFile(mFile);
+            if (!mTempFile.renameTo(mFile)) {
+                throw new FileNotFoundException("Rename " + mTempFile.getPath() +
+                        " to " + mFile.getPath() + " error");
+            }
+
+            // Callback
+            if (mListener != null) {
+                mListener.onSuccess();
+            }
+
+            // We do not need result
+            return null;
+        }
+
+        private void transferData(InputStream in, OutputStream out)
+                throws Exception {
+            final byte data[] = new byte[512 * 1024];
+            mReceivedSize = 0;
+
+            while (true) {
+                // Check stop first
+                checkStop();
+
+                int bytesRead = in.read(data);
+                if (bytesRead == -1)
+                    break;
+                out.write(data, 0, bytesRead);
+                mReceivedSize += bytesRead;
+
+                if (mListener != null) {
+                    mListener.onDownload(mReceivedSize, mContentLength);
+                }
+            }
+
+            if (mContentLength != -1 && mReceivedSize != mContentLength) {
+                throw new UncompletedException("Received size is " + mReceivedSize
+                        + ", but ContentLength is " + mContentLength);
+            }
+        }
+
+        @Override
+        public boolean onRetry(Exception previousException) {
+            // Delete unfinished file
+            Utils.deleteFile(mTempFile);
+            Utils.deleteFile(mFile);
+
+            if (previousException instanceof StopRequestException) {
+                return false;
+            } else {
+                return true;
+            }
+        }
+
+        @Override
+        public void onRequestFailed(Exception exception) {
+            if (mListener != null) {
+                if (exception instanceof StopRequestException) {
+                    mListener.onStop();
+                } else {
+                    mListener.onFailure(exception);
+                }
+            }
+        }
+    }
+
+    /**
+     * Http GET method
+     * @param url the url to get
+     * @return body
+     */
+    public String get(String url) throws Exception {
+        return (String) requst(new GetHelper(url));
+    }
+
+    /**
+     * Post form data
+     * @param url the url to post
+     * @param args the form to post
+     * @return body
+     */
+    public String postForm(String url, String[][] args) throws Exception {
+        return (String) requst(new PostFormHelper(url, args));
+    }
+
+    /**
+     * Post json data
+     * @param url the url to post
+     * @param json the json to post
+     * @return body
+     */
+    public String postJson(String url, JSONObject json) throws Exception {
+        return (String) requst(new PostJsonHelper(url, json));
+    }
+
+    /**
+     * Post data, multipart/form-data
+     * @param url the url to post
+     * @param dataList the data list to post
+     * @return body
+     */
+    public String postFormData(String url, List<FormData> dataList) throws Exception {
+        return (String)requst(new PostFormDataHelper(url, dataList));
+    }
+
+    /**
+     * Get image
+     * @param url the url to get image
+     * @return bitmap
+     */
+    public Bitmap getImage(String url) throws Exception {
+        return (Bitmap) requst(new GetImageHelper(url));
+    }
+
+    /**
+     * Init DownloadHelper
+     *
+     * @param url the url to download
+     * @param dir the dir to download file
+     * @param file the file name
+     * @param controlor download control
+     * @param listener download listener
+     */
+    public void download(String url, File dir, String file,
+            DownloadControlor controlor, OnDownloadListener listener) throws Exception {
+        requst(new DownloadHelper(url, dir, file, controlor, listener));
+    }
+}
diff --git a/app/src/main/java/com/hippo/network/RedirectionException.java b/app/src/main/java/com/hippo/network/RedirectionException.java
new file mode 100644
index 000000000..125028fb6
--- /dev/null
+++ b/app/src/main/java/com/hippo/network/RedirectionException.java
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2014-2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.network;
+
+public class RedirectionException extends Exception {
+
+    public RedirectionException() {
+        super("To many redirection");
+    }
+}
diff --git a/app/src/main/java/com/hippo/network/ResponseCodeException.java b/app/src/main/java/com/hippo/network/ResponseCodeException.java
new file mode 100644
index 000000000..8ff03d7f3
--- /dev/null
+++ b/app/src/main/java/com/hippo/network/ResponseCodeException.java
@@ -0,0 +1,19 @@
+/*
+ * Copyright (C) 2014-2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.network;
+
+public class ResponseCodeException extends Exception {
+}
diff --git a/app/src/main/java/com/hippo/network/StopRequestException.java b/app/src/main/java/com/hippo/network/StopRequestException.java
new file mode 100644
index 000000000..8077f8332
--- /dev/null
+++ b/app/src/main/java/com/hippo/network/StopRequestException.java
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2014-2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.network;
+
+public class StopRequestException extends Exception {
+
+    public StopRequestException() {
+        super("Stoped by request");
+    }
+}
diff --git a/app/src/main/java/com/hippo/network/UncompletedException.java b/app/src/main/java/com/hippo/network/UncompletedException.java
new file mode 100644
index 000000000..334ef19d9
--- /dev/null
+++ b/app/src/main/java/com/hippo/network/UncompletedException.java
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2014-2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.network;
+
+public class UncompletedException extends Exception {
+
+    public UncompletedException() {
+        super("Uncompleted error");
+    }
+
+    public UncompletedException(String detailMessage) {
+        super(detailMessage);
+    }
+}
diff --git a/app/src/main/java/com/hippo/network/UrlBuilder.java b/app/src/main/java/com/hippo/network/UrlBuilder.java
new file mode 100644
index 000000000..f932090c0
--- /dev/null
+++ b/app/src/main/java/com/hippo/network/UrlBuilder.java
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2014-2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.network;
+
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+
+public class UrlBuilder {
+
+    public String mRootUrl;
+    public Map<String, Object> mQueryMap = new HashMap<String, Object>();
+
+    public UrlBuilder(String rootUrl) {
+        mRootUrl = rootUrl;
+    }
+
+    public void addQuery(String key, Object value) {
+        mQueryMap.put(key, value);
+    }
+
+    public String build() {
+        if (mQueryMap.size() == 0) {
+            return mRootUrl;
+        } else {
+            StringBuilder sb = new StringBuilder(mRootUrl);
+            sb.append("?");
+
+            Iterator<String> iter = mQueryMap.keySet().iterator();
+            if (iter.hasNext()) {
+                String key = iter.next();
+                Object value = mQueryMap.get(key);
+                sb.append(key).append("=").append(value);
+            }
+            while (iter.hasNext()) {
+                String key = iter.next();
+                Object value = mQueryMap.get(key);
+                sb.append("&").append(key).append("=").append(value);
+            }
+            return sb.toString();
+        }
+    }
+}
diff --git a/app/src/main/java/com/hippo/util/AssertUtils.java b/app/src/main/java/com/hippo/util/AssertUtils.java
new file mode 100644
index 000000000..59db485c5
--- /dev/null
+++ b/app/src/main/java/com/hippo/util/AssertUtils.java
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.util;
+
+public class AssertUtils {
+
+    public static void assertNotNull(Object object) throws NullPointerException {
+        assertNotNull(null, object);
+    }
+
+    public static void assertNotNull(String message, Object object)
+            throws NullPointerException {
+        if (object == null) {
+            throw new NullPointerException(message);
+        }
+    }
+
+    public static void assertEquals(String message, int expected, int actual)
+            throws NotEqualsException {
+        if (expected != actual) {
+            throw new NotEqualsException(message);
+        }
+    }
+
+}
diff --git a/app/src/main/java/com/hippo/util/FastByteArrayOutputStream.java b/app/src/main/java/com/hippo/util/FastByteArrayOutputStream.java
new file mode 100644
index 000000000..6a81082ed
--- /dev/null
+++ b/app/src/main/java/com/hippo/util/FastByteArrayOutputStream.java
@@ -0,0 +1,230 @@
+/*
+ * Copyright (C) 2014-2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.util;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.UnsupportedEncodingException;
+
+/**
+ * It is the same as {@link java.io.ByteArrayOutputStream}, but buffer can be got
+ * directly. So it is not safe.
+ */
+public class FastByteArrayOutputStream extends OutputStream {
+    /**
+     * The byte array containing the bytes written.
+     */
+    protected byte[] buf;
+
+    /**
+     * The number of bytes written.
+     */
+    protected int count;
+
+    /**
+     * Constructs a new ByteArrayOutputStream with a default size of 32 bytes.
+     * If more than 32 bytes are written to this instance, the underlying byte
+     * array will expand.
+     */
+    public FastByteArrayOutputStream() {
+        buf = new byte[32];
+    }
+
+    /**
+     * Constructs a new {@code ByteArrayOutputStream} with a default size of
+     * {@code size} bytes. If more than {@code size} bytes are written to this
+     * instance, the underlying byte array will expand.
+     *
+     * @param size
+     *            initial size for the underlying byte array, must be
+     *            non-negative.
+     * @throws IllegalArgumentException
+     *             if {@code size} < 0.
+     */
+    public FastByteArrayOutputStream(int size) {
+        if (size >= 0) {
+            buf = new byte[size];
+        } else {
+            throw new IllegalArgumentException("size < 0");
+        }
+    }
+
+    /**
+     * Closes this stream. This releases system resources used for this stream.
+     *
+     * @throws java.io.IOException
+     *             if an error occurs while attempting to close this stream.
+     */
+    @Override
+    public void close() throws IOException {
+        /**
+         * Although the spec claims "A closed stream cannot perform output
+         * operations and cannot be reopened.", this implementation must do
+         * nothing.
+         */
+        super.close();
+    }
+
+    private void expand(int i) {
+        /* Can the buffer handle @i more bytes, if not expand it */
+        if (count + i <= buf.length) {
+            return;
+        }
+
+        byte[] newbuf = new byte[(count + i) * 2];
+        System.arraycopy(buf, 0, newbuf, 0, count);
+        buf = newbuf;
+    }
+
+    /**
+     * Resets this stream to the beginning of the underlying byte array. All
+     * subsequent writes will overwrite any bytes previously stored in this
+     * stream.
+     */
+    public synchronized void reset() {
+        count = 0;
+    }
+
+    /**
+     * Returns the total number of bytes written to this stream so far.
+     *
+     * @return the number of bytes written to this stream.
+     */
+    public int size() {
+        return count;
+    }
+
+    /**
+     * Returns the contents of this ByteArrayOutputStream as a byte array. Any
+     * changes made to the receiver after returning will not be reflected in the
+     * byte array returned to the caller.
+     *
+     * @return this stream's current contents as a byte array.
+     */
+    public synchronized byte[] getBuffer() {
+        return buf;
+    }
+
+    /**
+     * Returns the contents of this ByteArrayOutputStream as a string. Any
+     * changes made to the receiver after returning will not be reflected in the
+     * string returned to the caller.
+     *
+     * @return this stream's current contents as a string.
+     */
+
+    @Override
+    public String toString() {
+        return new String(buf, 0, count);
+    }
+
+    /**
+     * Returns the contents of this ByteArrayOutputStream as a string. Each byte
+     * {@code b} in this stream is converted to a character {@code c} using the
+     * following function:
+     * {@code c == (char)(((hibyte & 0xff) << 8) | (b & 0xff))}. This method is
+     * deprecated and either {@link #toString()} or {@link #toString(String)}
+     * should be used.
+     *
+     * @param hibyte
+     *            the high byte of each resulting Unicode character.
+     * @return this stream's current contents as a string with the high byte set
+     *         to {@code hibyte}.
+     * @deprecated Use {@link #toString()} instead.
+     */
+    @Deprecated
+    public String toString(int hibyte) {
+        char[] newBuf = new char[size()];
+        for (int i = 0; i < newBuf.length; i++) {
+            newBuf[i] = (char) (((hibyte & 0xff) << 8) | (buf[i] & 0xff));
+        }
+        return new String(newBuf);
+    }
+
+    /**
+     * Returns the contents of this ByteArrayOutputStream as a string converted
+     * according to the encoding declared in {@code charsetName}.
+     *
+     * @param charsetName
+     *            a string representing the encoding to use when translating
+     *            this stream to a string.
+     * @return this stream's current contents as an encoded string.
+     * @throws java.io.UnsupportedEncodingException
+     *             if the provided encoding is not supported.
+     */
+    public String toString(String charsetName) throws UnsupportedEncodingException {
+        return new String(buf, 0, count, charsetName);
+    }
+
+    /**
+     * Writes {@code count} bytes from the byte array {@code buffer} starting at
+     * offset {@code index} to this stream.
+     *
+     * @param buffer
+     *            the buffer to be written.
+     * @param offset
+     *            the initial position in {@code buffer} to retrieve bytes.
+     * @param len
+     *            the number of bytes of {@code buffer} to write.
+     * @throws NullPointerException
+     *             if {@code buffer} is {@code null}.
+     * @throws IndexOutOfBoundsException
+     *             if {@code offset < 0} or {@code len < 0}, or if
+     *             {@code offset + len} is greater than the length of
+     *             {@code buffer}.
+     */
+    @Override
+    public synchronized void write(byte[] buffer, int offset, int len) {
+        if ((offset | count) < 0 || offset > buffer.length || buffer.length - offset < count) {
+            throw new ArrayIndexOutOfBoundsException("length=" + buffer.length + "; regionStart=" + offset
+                    + "; regionLength=" + count);
+        }
+        if (len == 0) {
+            return;
+        }
+        expand(len);
+        System.arraycopy(buffer, offset, buf, this.count, len);
+        this.count += len;
+    }
+
+    /**
+     * Writes the specified byte {@code oneByte} to the OutputStream. Only the
+     * low order byte of {@code oneByte} is written.
+     *
+     * @param oneByte
+     *            the byte to be written.
+     */
+    @Override
+    public synchronized void write(int oneByte) {
+        if (count == buf.length) {
+            expand(1);
+        }
+        buf[count++] = (byte) oneByte;
+    }
+
+    /**
+     * Takes the contents of this stream and writes it to the output stream
+     * {@code out}.
+     *
+     * @param out
+     *            an OutputStream on which to write the contents of this stream.
+     * @throws java.io.IOException
+     *             if an error occurs while writing to {@code out}.
+     */
+    public synchronized void writeTo(OutputStream out) throws IOException {
+        out.write(buf, 0, count);
+    }
+}
diff --git a/app/src/main/java/com/hippo/util/MathUtils.java b/app/src/main/java/com/hippo/util/MathUtils.java
new file mode 100644
index 000000000..b2cdff714
--- /dev/null
+++ b/app/src/main/java/com/hippo/util/MathUtils.java
@@ -0,0 +1,304 @@
+/*
+ * Copyright (C) 2014-2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.util;
+
+import java.util.Random;
+
+// Get most code from android.util.MathUtils
+public final class MathUtils {
+    private static final Random sRandom = new Random();
+    private static final float DEG_TO_RAD = 3.1415926f / 180.0f;
+    private static final float RAD_TO_DEG = 180.0f / 3.1415926f;
+
+    public static float abs(float v) {
+        return v > 0 ? v : -v;
+    }
+
+    public static float log(float a) {
+        return (float) Math.log(a);
+    }
+
+    public static float exp(float a) {
+        return (float) Math.exp(a);
+    }
+
+    public static float pow(float a, float b) {
+        return (float) Math.pow(a, b);
+    }
+
+    public static float max(float a, float b) {
+        return a > b ? a : b;
+    }
+
+    public static float max(int a, int b) {
+        return a > b ? a : b;
+    }
+
+    public static float max(float a, float b, float c) {
+        return a > b ? (a > c ? a : c) : (b > c ? b : c);
+    }
+
+    public static float max(int a, int b, int c) {
+        return a > b ? (a > c ? a : c) : (b > c ? b : c);
+    }
+
+    public static float max(float... arg) {
+        int length = arg.length;
+        if (length <= 0) {
+            throw new IllegalArgumentException("Empty argument");
+        } else {
+            float n = arg[0];
+            float m;
+            for (int i = 1; i < length; i++) {
+                m = arg[i];
+                if (m > n)
+                    n = m;
+            }
+            return n;
+        }
+    }
+
+    public static int max(int... arg) {
+        int length = arg.length;
+        if (length <= 0) {
+            throw new IllegalArgumentException("Empty argument");
+        } else {
+            int n = arg[0];
+            int m;
+            for (int i = 1; i < length; i++) {
+                m = arg[i];
+                if (m > n)
+                    n = m;
+            }
+            return n;
+        }
+    }
+
+    public static float min(float a, float b) {
+        return a < b ? a : b;
+    }
+
+    public static float min(int a, int b) {
+        return a < b ? a : b;
+    }
+
+    public static float min(float a, float b, float c) {
+        return a < b ? (a < c ? a : c) : (b < c ? b : c);
+    }
+
+    public static float min(int a, int b, int c) {
+        return a < b ? (a < c ? a : c) : (b < c ? b : c);
+    }
+
+    public static float min(float... arg) {
+        int length = arg.length;
+        if (length <= 0) {
+            throw new IllegalArgumentException("Empty argument");
+        } else {
+            float n = arg[0];
+            float m;
+            for (int i = 1; i < length; i++) {
+                m = arg[i];
+                if (m < n)
+                    n = m;
+            }
+            return n;
+        }
+    }
+
+    public static int min(int... arg) {
+        int length = arg.length;
+        if (length <= 0) {
+            throw new IllegalArgumentException("Empty argument");
+        } else {
+            int n = arg[0];
+            int m;
+            for (int i = 1; i < length; i++) {
+                m = arg[i];
+                if (m < n)
+                    n = m;
+            }
+            return n;
+        }
+    }
+
+    public static float dist(float x1, float y1, float x2, float y2) {
+        final float x = (x2 - x1);
+        final float y = (y2 - y1);
+        return (float) Math.hypot(x, y);
+    }
+
+    public static float dist(float x1, float y1, float z1, float x2, float y2, float z2) {
+        final float x = (x2 - x1);
+        final float y = (y2 - y1);
+        final float z = (z2 - z1);
+        return (float) Math.sqrt(x * x + y * y + z * z);
+    }
+
+    public static float mag(float a, float b) {
+        return (float) Math.hypot(a, b);
+    }
+
+    public static float mag(float a, float b, float c) {
+        return (float) Math.sqrt(a * a + b * b + c * c);
+    }
+
+    public static float sq(float v) {
+        return v * v;
+    }
+
+    public static float radians(float degrees) {
+        return degrees * DEG_TO_RAD;
+    }
+
+    public static float degrees(float radians) {
+        return radians * RAD_TO_DEG;
+    }
+
+    public static float acos(float value) {
+        return (float) Math.acos(value);
+    }
+
+    public static float asin(float value) {
+        return (float) Math.asin(value);
+    }
+
+    public static float atan(float value) {
+        return (float) Math.atan(value);
+    }
+
+    public static float atan2(float a, float b) {
+        return (float) Math.atan2(a, b);
+    }
+
+    public static float tan(float angle) {
+        return (float) Math.tan(angle);
+    }
+
+    public static int lerp(int start, int stop, float amount) {
+        return start + (int) ((stop - start) * amount);
+    }
+
+    public static float lerp(float start, float stop, float amount) {
+        return start + (stop - start) * amount;
+    }
+
+    public static float norm(float start, float stop, float value) {
+        return (value - start) / (stop - start);
+    }
+
+    public static float map(float minStart, float minStop, float maxStart, float maxStop, float value) {
+        return maxStart + (maxStart - maxStop) * ((value - minStart) / (minStop - minStart));
+    }
+
+    /**
+     * Returns the input value x clamped to the range [min, max].
+     *
+     * @param x
+     * @param min
+     * @param max
+     * @return
+     */
+    public static int clamp(int x, int min, int max) {
+        if (x > max) return max;
+        if (x < min) return min;
+        return x;
+    }
+
+    /**
+     * Returns the input value x clamped to the range [min, max].
+     *
+     * @param x
+     * @param min
+     * @param max
+     * @return
+     */
+    public static float clamp(float x, float min, float max) {
+        if (x > max) return max;
+        if (x < min) return min;
+        return x;
+    }
+
+    /**
+     * Returns the input value x clamped to the range [min, max].
+     * @param x
+     * @param min
+     * @param max
+     * @return
+     */
+    public static long clamp(long x, long min, long max) {
+        if (x > max) return max;
+        if (x < min) return min;
+        return x;
+    }
+
+    /**
+     * Returns the next power of two.
+     * Returns the input if it is already power of 2.
+     * Throws IllegalArgumentException if the input is <= 0 or
+     * the answer overflows.
+     *
+     * @param n
+     * @return
+     */
+    public static int nextPowerOf2(int n) {
+        if (n <= 0 || n > (1 << 30)) throw new IllegalArgumentException("n is invalid: " + n);
+        n -= 1;
+        n |= n >> 16;
+        n |= n >> 8;
+        n |= n >> 4;
+        n |= n >> 2;
+        n |= n >> 1;
+        return n + 1;
+    }
+
+    /**
+     * Return is a and b is in the same side to standard.
+     * If one of a and b equals standard, return true.
+     *
+     * @param a
+     * @param b
+     * @param standard
+     * @return
+     */
+    public static boolean isSameSide(float a, float b, float standard) {
+        return (a >= standard && b >= standard) || (a <= standard && b <= standard);
+    }
+
+    public static int random(int howbig) {
+        return (int) (sRandom.nextFloat() * howbig);
+    }
+
+    public static int random(int howsmall, int howbig) {
+        if (howsmall >= howbig)
+            return howsmall;
+        return (int) (sRandom.nextFloat() * (howbig - howsmall) + howsmall);
+    }
+
+    public static float random(float howbig) {
+        return sRandom.nextFloat() * howbig;
+    }
+
+    public static float random(float howsmall, float howbig) {
+        if (howsmall >= howbig)
+            return howsmall;
+        return sRandom.nextFloat() * (howbig - howsmall) + howsmall;
+    }
+
+    public static void randomSeed(long seed) {
+        sRandom.setSeed(seed);
+    }
+}
diff --git a/app/src/main/java/com/hippo/util/NotEqualsException.java b/app/src/main/java/com/hippo/util/NotEqualsException.java
new file mode 100644
index 000000000..fc7852a75
--- /dev/null
+++ b/app/src/main/java/com/hippo/util/NotEqualsException.java
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.util;
+
+public class NotEqualsException extends Exception {
+
+    public NotEqualsException(String detailMessage) {
+        super(detailMessage);
+    }
+}
diff --git a/app/src/main/java/com/hippo/util/Utils.java b/app/src/main/java/com/hippo/util/Utils.java
new file mode 100644
index 000000000..9965b6356
--- /dev/null
+++ b/app/src/main/java/com/hippo/util/Utils.java
@@ -0,0 +1,807 @@
+/*
+ * Copyright (C) 2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.util;
+
+import android.annotation.SuppressLint;
+import android.content.Context;
+import android.os.AsyncTask;
+import android.os.Build;
+import android.os.Vibrator;
+import android.text.TextUtils;
+import android.webkit.MimeTypeMap;
+
+import java.io.ByteArrayOutputStream;
+import java.io.Closeable;
+import java.io.EOFException;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.lang.reflect.Method;
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
+import java.util.Collection;
+import java.util.Date;
+import java.util.Locale;
+
+public final class Utils {
+    @SuppressWarnings("unused")
+    private static String TAG = Utils.class.getSimpleName();
+
+    public static final DateFormat DATE_FORMATE_FOR_GALLERY = new SimpleDateFormat("yyyy-MM-dd HH:mm", Locale.US);
+
+    public static final DateFormat DATE_FORMATE_FOR_UPDATE = new SimpleDateFormat("yyyyMMdd", Locale.US);
+
+    public static final String EMPTY_STRING = "";
+
+    /**
+     * Colse is. Don't worry about anything.
+     *
+     * @param is
+     */
+    public static void closeQuietly(Closeable is) {
+        try {
+            if (is != null)
+                is.close();
+        } catch (IOException e) {
+        }
+    }
+
+    /**
+     * Put InputStream to File, default bufferSize is 512 * 1024
+     *
+     * @param is
+     * @param file
+     * @throws java.io.IOException
+     */
+    public static void inputStream2File(InputStream is, File file) throws IOException {
+        OutputStream os = new FileOutputStream(file);
+        copy(is, os);
+        os.close();
+    }
+
+    /**
+     * Copy from is to os
+     *
+     * @param is
+     * @param os
+     * @throws java.io.IOException
+     */
+    public static void copy(InputStream is, OutputStream os) throws IOException {
+        copy(is, os, 512 * 1024);
+    }
+
+    /**
+     * Copy from is to os
+     *
+     * @param is
+     * @param os
+     * @param size Buffer size
+     * @throws java.io.IOException
+     */
+    public static void copy(InputStream is, OutputStream os, int size) throws IOException {
+        byte[] buffer = new byte[size];
+        int bytesRead;
+        while((bytesRead = is.read(buffer)) !=-1)
+            os.write(buffer, 0, bytesRead);
+        os.flush();
+    }
+
+    /**
+     * Get String from InputStream
+     *
+     * @param is
+     * @param charset
+     * @param size The InputStream size you estimate
+     * @return
+     */
+    public static String inputStream2String(InputStream is, String charset, int size) {
+        ByteArrayOutputStream baos = new ByteArrayOutputStream(size);
+        String str = null;
+        try {
+            copy(is, baos, 1024);
+            str = baos.toString(charset);
+        } catch (IOException e) {
+            e.printStackTrace();
+        } finally {
+            closeQuietly(baos);
+        }
+        return str;
+    }
+
+    /**
+     * Not work for dir, Copy from scr to dst, no matter dst exist or not.
+     *
+     * @param src
+     * @param dst
+     * @return True for success, false for fail
+     */
+    public static boolean copyFile(File src, File dst) {
+        FileInputStream fis = null;
+        FileOutputStream fos = null;
+        try {
+            fis = new FileInputStream(src);
+            fos = new FileOutputStream(dst);
+            copy(fis, fos);
+        } catch (Throwable e) {
+            return false;
+        } finally {
+            closeQuietly(fis);
+            closeQuietly(fos);
+        }
+        return true;
+    }
+
+    /**
+     * If you want to copy on new thread, use it to know
+     * success or not.
+     */
+    public static interface OnCopyFileOverListener {
+        public void onCopyFileOver(boolean success, File src, File dst);
+    }
+
+    /**
+     * Copy file in new thread
+     *
+     * @param src
+     * @param dst
+     * @param l
+     */
+    public static void copyFileInNewThread(final File src, final File dst, final OnCopyFileOverListener l) {
+        execute(false, new AsyncTask<Void, Void, Boolean>() {
+            @Override
+            protected Boolean doInBackground(Void... params) {
+                return copyFile(src, dst);
+            }
+
+            @Override
+            protected void onPostExecute(Boolean result) {
+                if (l != null)
+                    l.onCopyFileOver(result, src, dst);
+            }
+        }, (Void[]) null);
+    }
+
+    /**
+     * Try to delete file or dir and it's children.
+     *
+     * @param file The file to deleted.
+     * @return True if file is delete, children included.
+     */
+    public static boolean deleteFile(File file) {
+        if (file == null) {
+            return false;
+        }
+
+        boolean result = true;
+
+        File[] files = file.listFiles();
+        if (files != null) {
+            for (File f : files)
+                deleteFile(f);
+        }
+        if (file.exists()) {
+            // Avoid EBUSY (Device or resource busy) error
+            final File to = new File(file.getAbsolutePath()
+                    + System.currentTimeMillis());
+            if (file.renameTo(to))
+                result &= to.delete();
+            else
+                result &= file.delete();
+        }
+
+        return result;
+    }
+
+    /**
+     * If you want to copy on new thread, use it to know
+     * success or not.
+     */
+    public static interface OnDeleteFileOverListener {
+        public void onDeleteFileOver(boolean success, File file);
+    }
+
+    /**
+     * Start a new thread to delete dir
+     */
+    public static void deleteFileInNewThread(final File file, final OnDeleteFileOverListener l) {
+        execute(false, new AsyncTask<Void, Void, Boolean>() {
+            @Override
+            protected Boolean doInBackground(Void... params) {
+                return deleteFile(file);
+            }
+
+            @Override
+            protected void onPostExecute(Boolean result) {
+                if (l != null)
+                    l.onDeleteFileOver(result, file);
+            }
+        }, (Void[]) null);
+    }
+
+    public static int getDateForUpdate() {
+        return Utils.parseIntSafely(DATE_FORMATE_FOR_UPDATE.format(new Date()), 0);
+    }
+
+
+    private static String[] SIZE_UNIT = {"%.2f B", "%.2f KB", "%.2f MB", "%.2f GB"};
+
+    public static String sizeToString(long size) {
+        int length = SIZE_UNIT.length;
+
+        float sizeFloat = size;
+        for (int i = 0; i < length - 1; i++) {
+            if (sizeFloat < 1024)
+                return String.format(SIZE_UNIT[i], sizeFloat);
+            sizeFloat /= 1024;
+        }
+        return String.format(SIZE_UNIT[length - 1], sizeFloat);
+    }
+
+    /**
+     * Execute an {@link android.os.AsyncTask} on a thread pool
+     *
+     * @param forceSerial True to force the task to run in serial order
+     * @param task Task to execute
+     * @param args Optional arguments to pass to
+     *            {@link android.os.AsyncTask#execute(Object[])}
+     * @param <T> Task argument type
+     */
+    @SafeVarargs
+    @SuppressLint("NewApi")
+    public static <T> void execute(final boolean forceSerial, final AsyncTask<T, ?, ?> task,
+            final T... args) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.DONUT) {
+            throw new UnsupportedOperationException(
+                    "This class can only be used on API 4 and newer.");
+        }
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB || forceSerial) {
+            task.execute(args);
+        } else {
+            task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, args);
+        }
+    }
+
+    private static final String[] ESCAPE_CHARATER_LIST = {
+        "&amp;",
+        "&lt;",
+        "&gt;",
+        "&quot;",
+        "&#039;",
+        "&times;"
+    };
+
+    private static final String[] UNESCAPE_CHARATER_LIST = {
+        "&",
+        "<",
+        ">",
+        "\"",
+        "'",
+        "×"
+    };
+
+    /**
+     * Mostly title and url need it
+     * @param str
+     * @return
+     */
+    public static String unescapeXml(String str) {
+        return replaceEach(str, ESCAPE_CHARATER_LIST, UNESCAPE_CHARATER_LIST);
+    }
+
+    /**
+     * Make file name valid by removing invalid character and set max length
+     * @param name
+     * @return
+     */
+    public static String standardizeFilename(String name) {
+        String result = name;
+        // Remove invaild char
+        result = result.replaceAll("[\\\\/:*?\"<>\\|]", "");
+        // Make sure size
+        if (result.length() > 255)
+            result = result.substring(0,  255);
+        // Avoid start with whitespace or end with whitespace
+        result = result.replaceAll("^[\\s]+", "").replace("[\\s]+$", "");
+        return result;
+    }
+
+    /**
+     * Joins the elements of the provided array into a single String
+     * containing the provided list of elements.
+     *
+     * @param array
+     * @param separator
+     * @return
+     */
+    public static String join(final Object[] array,
+            final Object separator) {
+        final StringBuilder sb = new StringBuilder(array.length * 16);
+        for (int i = 0; i < array.length; i++) {
+            if (i != 0)
+                sb.append(separator);
+            sb.append(array[i]);
+        }
+        return sb.toString();
+    }
+
+    /**
+     * <p>
+     * Replaces all occurrences of Strings within another String.
+     * </p>
+     *
+     * <p>
+     * A {@code null} reference passed to this method is a no-op, or if
+     * any "search string" or "string to replace" is null, that replace will be
+     * ignored. This will not repeat. For repeating replaces, call the
+     * overloaded method.
+     * </p>
+     *
+     * <pre>
+     *  StringUtils.replaceEach(null, *, *)        = null
+     *  StringUtils.replaceEach("", *, *)          = ""
+     *  StringUtils.replaceEach("aba", null, null) = "aba"
+     *  StringUtils.replaceEach("aba", new String[0], null) = "aba"
+     *  StringUtils.replaceEach("aba", null, new String[0]) = "aba"
+     *  StringUtils.replaceEach("aba", new String[]{"a"}, null)  = "aba"
+     *  StringUtils.replaceEach("aba", new String[]{"a"}, new String[]{""})  = "b"
+     *  StringUtils.replaceEach("aba", new String[]{null}, new String[]{"a"})  = "aba"
+     *  StringUtils.replaceEach("abcde", new String[]{"ab", "d"}, new String[]{"w", "t"})  = "wcte"
+     *  (example of how it does not repeat)
+     *  StringUtils.replaceEach("abcde", new String[]{"ab", "d"}, new String[]{"d", "t"})  = "dcte"
+     * </pre>
+     *
+     * @param text
+     *            text to search and replace in, no-op if null
+     * @param searchList
+     *            the Strings to search for, no-op if null
+     * @param replacementList
+     *            the Strings to replace them with, no-op if null
+     * @return the text with any replacements processed, {@code null} if
+     *         null String input
+     * @throws IllegalArgumentException
+     *             if the lengths of the arrays are not the same (null is ok,
+     *             and/or size 0)
+     */
+    // Get from org.apache.commons.lang3.StringUtils
+    public static String replaceEach(final String text, final String[] searchList, final String[] replacementList) {
+        return replaceEach(text, searchList, replacementList, false, 0);
+    }
+
+    /**
+     * <p>
+     * Replaces all occurrences of Strings within another String.
+     * </p>
+     *
+     * <p>
+     * A {@code null} reference passed to this method is a no-op, or if
+     * any "search string" or "string to replace" is null, that replace will be
+     * ignored.
+     * </p>
+     *
+     * <pre>
+     *  StringUtils.replaceEach(null, *, *, *) = null
+     *  StringUtils.replaceEach("", *, *, *) = ""
+     *  StringUtils.replaceEach("aba", null, null, *) = "aba"
+     *  StringUtils.replaceEach("aba", new String[0], null, *) = "aba"
+     *  StringUtils.replaceEach("aba", null, new String[0], *) = "aba"
+     *  StringUtils.replaceEach("aba", new String[]{"a"}, null, *) = "aba"
+     *  StringUtils.replaceEach("aba", new String[]{"a"}, new String[]{""}, *) = "b"
+     *  StringUtils.replaceEach("aba", new String[]{null}, new String[]{"a"}, *) = "aba"
+     *  StringUtils.replaceEach("abcde", new String[]{"ab", "d"}, new String[]{"w", "t"}, *) = "wcte"
+     *  (example of how it repeats)
+     *  StringUtils.replaceEach("abcde", new String[]{"ab", "d"}, new String[]{"d", "t"}, false) = "dcte"
+     *  StringUtils.replaceEach("abcde", new String[]{"ab", "d"}, new String[]{"d", "t"}, true) = "tcte"
+     *  StringUtils.replaceEach("abcde", new String[]{"ab", "d"}, new String[]{"d", "ab"}, *) = IllegalStateException
+     * </pre>
+     *
+     * @param text
+     *            text to search and replace in, no-op if null
+     * @param searchList
+     *            the Strings to search for, no-op if null
+     * @param replacementList
+     *            the Strings to replace them with, no-op if null
+     * @param repeat if true, then replace repeatedly
+     *       until there are no more possible replacements or timeToLive < 0
+     * @param timeToLive
+     *            if less than 0 then there is a circular reference and endless
+     *            loop
+     * @return the text with any replacements processed, {@code null} if
+     *         null String input
+     * @throws IllegalStateException
+     *             if the search is repeating and there is an endless loop due
+     *             to outputs of one being inputs to another
+     * @throws IllegalArgumentException
+     *             if the lengths of the arrays are not the same (null is ok,
+     *             and/or size 0)
+     */
+    // Get from org.apache.commons.lang3.StringUtils
+    private static String replaceEach(
+            final String text, final String[] searchList, final String[] replacementList, final boolean repeat, final int timeToLive) {
+
+        // mchyzer Performance note: This creates very few new objects (one major goal)
+        // let me know if there are performance requests, we can create a harness to measure
+
+        if (text == null || TextUtils.isEmpty(text) || searchList == null ||
+                searchList.length == 0 || replacementList == null || replacementList.length == 0) {
+            return text;
+        }
+
+        // if recursing, this shouldn't be less than 0
+        if (timeToLive < 0) {
+            throw new IllegalStateException("Aborting to protect against StackOverflowError - " +
+                                            "output of one loop is the input of another");
+        }
+
+        final int searchLength = searchList.length;
+        final int replacementLength = replacementList.length;
+
+        // make sure lengths are ok, these need to be equal
+        if (searchLength != replacementLength) {
+            throw new IllegalArgumentException("Search and Replace array lengths don't match: "
+                + searchLength
+                + " vs "
+                + replacementLength);
+        }
+
+        // keep track of which still have matches
+        final boolean[] noMoreMatchesForReplIndex = new boolean[searchLength];
+
+        // index on index that the match was found
+        int textIndex = -1;
+        int replaceIndex = -1;
+        int tempIndex = -1;
+
+        // index of replace array that will replace the search string found
+        // NOTE: logic duplicated below START
+        for (int i = 0; i < searchLength; i++) {
+            if (noMoreMatchesForReplIndex[i] || searchList[i] == null ||
+                    TextUtils.isEmpty(searchList[i]) || replacementList[i] == null) {
+                continue;
+            }
+            tempIndex = text.indexOf(searchList[i]);
+
+            // see if we need to keep searching for this
+            if (tempIndex == -1) {
+                noMoreMatchesForReplIndex[i] = true;
+            } else {
+                if (textIndex == -1 || tempIndex < textIndex) {
+                    textIndex = tempIndex;
+                    replaceIndex = i;
+                }
+            }
+        }
+        // NOTE: logic mostly below END
+
+        // no search strings found, we are done
+        if (textIndex == -1) {
+            return text;
+        }
+
+        int start = 0;
+
+        // get a good guess on the size of the result buffer so it doesn't have to double if it goes over a bit
+        int increase = 0;
+
+        // count the replacement text elements that are larger than their corresponding text being replaced
+        for (int i = 0; i < searchList.length; i++) {
+            if (searchList[i] == null || replacementList[i] == null) {
+                continue;
+            }
+            final int greater = replacementList[i].length() - searchList[i].length();
+            if (greater > 0) {
+                increase += 3 * greater; // assume 3 matches
+            }
+        }
+        // have upper-bound at 20% increase, then let Java take over
+        increase = Math.min(increase, text.length() / 5);
+
+        final StringBuilder buf = new StringBuilder(text.length() + increase);
+
+        while (textIndex != -1) {
+
+            for (int i = start; i < textIndex; i++) {
+                buf.append(text.charAt(i));
+            }
+            buf.append(replacementList[replaceIndex]);
+
+            start = textIndex + searchList[replaceIndex].length();
+
+            textIndex = -1;
+            replaceIndex = -1;
+            tempIndex = -1;
+            // find the next earliest match
+            // NOTE: logic mostly duplicated above START
+            for (int i = 0; i < searchLength; i++) {
+                if (noMoreMatchesForReplIndex[i] || searchList[i] == null ||
+                        TextUtils.isEmpty(searchList[i]) || replacementList[i] == null) {
+                    continue;
+                }
+                tempIndex = text.indexOf(searchList[i], start);
+
+                // see if we need to keep searching for this
+                if (tempIndex == -1) {
+                    noMoreMatchesForReplIndex[i] = true;
+                } else {
+                    if (textIndex == -1 || tempIndex < textIndex) {
+                        textIndex = tempIndex;
+                        replaceIndex = i;
+                    }
+                }
+            }
+            // NOTE: logic duplicated above END
+
+        }
+        final int textLength = text.length();
+        for (int i = start; i < textLength; i++) {
+            buf.append(text.charAt(i));
+        }
+        final String result = buf.toString();
+        if (!repeat) {
+            return result;
+        }
+
+        return replaceEach(result, searchList, replacementList, repeat, timeToLive - 1);
+    }
+
+    /**
+     * 0 for false, Non 0 for true
+     *
+     * @param integer
+     * @return
+     */
+    public static boolean int2boolean(int integer) {
+        return integer != 0;
+    }
+
+    /**
+     * false for 0, true for 1
+     *
+     * @param bool
+     * @return
+     */
+    public static int boolean2int(boolean bool) {
+        return bool ? 1 : 0;
+    }
+
+    /**
+     * Returns the ASCII characters up to but not including the next "\r\n", or
+     * "\n".
+     *
+     * @throws java.io.EOFException if the stream is exhausted before the next
+     *             newline character.
+     */
+    public static String readAsciiLine(final InputStream in) throws IOException {
+        final StringBuilder result = new StringBuilder(80);
+        while (true) {
+            final int c = in.read();
+            if (c == -1) {
+                throw new EOFException();
+            } else if (c == '\n') {
+                break;
+            }
+
+            result.append((char)c);
+        }
+        final int length = result.length();
+        if (length > 0 && result.charAt(length - 1) == '\r') {
+            result.setLength(length - 1);
+        }
+        return result.toString();
+    }
+
+    /**
+     * Try to make dir exists
+     *
+     * @param dir
+     * @param force
+     */
+    public static void ensureDir(File dir, boolean force) {
+        if (!dir.exists()) {
+            dir.mkdirs();
+        } else if (force && dir.isFile()) {
+            dir.delete();
+            dir.mkdirs();
+        }
+    }
+
+    /**
+     * Return true if point is in the rect
+     *
+     * @param area
+     * @param x
+     * @param y
+     * @return
+     */
+    public static boolean isInArea(int[] area, int x, int y) {
+        if (area == null)
+            throw new NullPointerException("area == null");
+        if (area.length != 4)
+            throw new IllegalArgumentException(
+                    "area's length should be 4, but it's length is " + area.length);
+        if (x >= area[0] && x < area[2] && y >= area[1] && y < area[3])
+            return true;
+        else
+            return false;
+    }
+
+    /**
+     * Is color is opaque
+     *
+     * @param color
+     * @return
+     */
+    // TODO put it to UiUtils.class
+    public static boolean isOpaque(int color) {
+        return color >>> 24 == 0xFF;
+    }
+
+    /**
+     * Throws AssertionError if the input is false.
+     * @param cond
+     */
+    public static void assertTrue(boolean cond) {
+        if (!cond) {
+            throw new AssertionError();
+        }
+    }
+
+    /**
+     * vibrator
+     *
+     * @param context
+     * @param milliseconds Duration
+     */
+    public static void vibrator(Context context, long milliseconds) {
+        // If user force disable vibrator permission, may throw error
+        try {
+            Vibrator v = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
+            v.vibrate(milliseconds);
+        } catch (Throwable e) {
+        }
+    }
+
+    // Removes duplicate adjacent slashes and any trailing slash.
+    private static String fixSlashes(String origPath) {
+        // Remove duplicate adjacent slashes.
+        boolean lastWasSlash = false;
+        char[] newPath = origPath.toCharArray();
+        int length = newPath.length;
+        int newLength = 0;
+        for (int i = 0; i < length; ++i) {
+            char ch = newPath[i];
+            if (ch == '/') {
+                if (!lastWasSlash) {
+                    newPath[newLength++] = File.separatorChar;
+                    lastWasSlash = true;
+                }
+            } else {
+                newPath[newLength++] = ch;
+                lastWasSlash = false;
+            }
+        }
+        // Remove any trailing slash (unless this is the root of the file system).
+        if (lastWasSlash && newLength > 1) {
+            newLength--;
+        }
+        // Reuse the original string if possible.
+        return (newLength != length) ? new String(newPath, 0, newLength) : origPath;
+    }
+
+    // Joins two path components, adding a separator only if necessary.
+    public static String joinPath(String dirPath, String name) {
+        if (name == null) {
+            throw new NullPointerException("name == null");
+        }
+        if (dirPath == null || TextUtils.isEmpty(dirPath)) {
+            return fixSlashes(name);
+        } else if (TextUtils.isEmpty(name)) {
+            return fixSlashes(dirPath);
+        } else {
+            int prefixLength = dirPath.length();
+            boolean haveSlash = (prefixLength > 0 && dirPath.charAt(prefixLength - 1) == File.separatorChar);
+            if (!haveSlash) {
+                haveSlash = (name.length() > 0 && name.charAt(0) == File.separatorChar);
+            }
+            return fixSlashes(haveSlash ? (dirPath + name) : (dirPath + File.separatorChar + name));
+        }
+    }
+
+    public static int parseIntSafely(String str, int defaultValue) {
+        try {
+            return Integer.parseInt(str);
+        } catch (Throwable e) {
+            return defaultValue;
+        }
+    }
+
+    public static float parseFloatSafely(String str, float defaultValue) {
+        try {
+            return Float.parseFloat(str);
+        } catch (Throwable e) {
+            return defaultValue;
+        }
+    }
+
+    public static int[] toIntArray(Collection<? extends Number> collection) {
+        Object[] boxedArray = collection.toArray();
+        int len = boxedArray.length;
+        int[] array = new int[len];
+        for (int i = 0; i < len; i++) {
+            // checkNotNull for GWT (do not optimize)
+            array[i] = ((Number) (boxedArray[i])).intValue();
+        }
+        return array;
+    }
+
+    // Throws NullPointerException if the input is null.
+    public static <T> T checkNotNull(T object) {
+        if (object == null) throw new NullPointerException();
+        return object;
+    }
+
+    /**
+     * Get extension from target string, int lower case
+     *
+     * @param name
+     * @param defautl
+     * @return
+     */
+    public static String getExtension(String name, String defautl) {
+        String ext = MimeTypeMap.getFileExtensionFromUrl(name);
+        if (TextUtils.isEmpty(ext))
+            ext = defautl;
+        return ext;
+    }
+
+    /**
+     * It will return null if can't find mime
+     *
+     * @param url
+     * @return
+     */
+    public static String getMimeType(String url) {
+        String type = null;
+        String extension = MimeTypeMap.getFileExtensionFromUrl(url);
+        if (extension != null) {
+            MimeTypeMap mime = MimeTypeMap.getSingleton();
+            type = mime.getMimeTypeFromExtension(extension);
+        }
+        return type;
+    }
+
+    /**
+     * If get error return "";
+     *
+     * @param key
+     * @return
+     */
+    public static String getSystemProperties(String key) {
+        try {
+            @SuppressWarnings("rawtypes")
+            Class c = Class.forName("android.os.SystemProperties");
+            @SuppressWarnings("unchecked")
+            Method m = c.getDeclaredMethod("get", String.class);
+            m.setAccessible(true);
+            String result = (String) m.invoke(null, key);
+            return result == null ? EMPTY_STRING : result;
+        } catch (Throwable e) {
+            return EMPTY_STRING;
+        }
+    }
+}
diff --git a/app/src/main/java/com/hippo/util/ViewUtils.java b/app/src/main/java/com/hippo/util/ViewUtils.java
index 9c1368cfb..bc38c6aec 100644
--- a/app/src/main/java/com/hippo/util/ViewUtils.java
+++ b/app/src/main/java/com/hippo/util/ViewUtils.java
@@ -198,7 +198,8 @@ public final class ViewUtils {
      * Set the enabled state of this view.
      *
      * @param v the view to set the enabled state
-     * @param visibility One of GONE, INVISIBLE, or GONE.
+     * @param visibility One of {@link android.view.View#GONE},
+     * {@link android.view.View#INVISIBLE}, or {@link android.view.View#GONE}.
      */
     public static void setVisibility(View v, int visibility) {
         if (visibility != v.getVisibility()) {
diff --git a/app/src/main/res/values/attrs.xml b/app/src/main/res/values/attrs.xml
index a5dc02b9a..fe9414a87 100644
--- a/app/src/main/res/values/attrs.xml
+++ b/app/src/main/res/values/attrs.xml
@@ -1,4 +1,18 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2015 Hippo Seven
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
 <resources>
 
     <declare-styleable name="FixedAspectImageView">
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 04a7db132..bea94dc8c 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2015 Hippo Seven
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
 <resources>
 
     <string name="app_name">EhViewer</string>
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
index 766ab9930..abbc72c71 100644
--- a/app/src/main/res/values/styles.xml
+++ b/app/src/main/res/values/styles.xml
@@ -1,3 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2015 Hippo Seven
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
 <resources>
 
     <!-- Base application theme. -->