diff --git a/app/.gitignore b/app/.gitignore
index 796b96d1c..aceae4974 100644
--- a/app/.gitignore
+++ b/app/.gitignore
@@ -1 +1,2 @@
 /build
+manifest-merger-release-report.txt
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index fd56d05d0..5396edd52 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -22,6 +22,16 @@
         android:label="@string/app_name"
         android:theme="@style/AppTheme" >
 
+        <activity
+            android:name="com.hippo.ehviewer.ui.StartActivity"
+            android:configChanges="orientation|screenSize|uiMode"
+            android:label="@string/app_name" >
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
     </application>
 
 </manifest>
diff --git a/app/src/main/java/com/hippo/ehviewer/ui/AbsActionBarActivity.java b/app/src/main/java/com/hippo/ehviewer/ui/AbsActionBarActivity.java
new file mode 100644
index 000000000..b2f59f1d1
--- /dev/null
+++ b/app/src/main/java/com/hippo/ehviewer/ui/AbsActionBarActivity.java
@@ -0,0 +1,44 @@
+/*
+ * 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.ui;
+
+import android.support.v7.app.ActionBarActivity;
+import android.view.View;
+import android.view.Window;
+
+public abstract class AbsActionBarActivity extends ActionBarActivity {
+    
+    public boolean post(Runnable action) {
+        Window w = getWindow();
+        if (w != null) {
+            View v = w.getDecorView();
+            return v != null && v.post(action);
+        } else {
+            return false;
+        }
+    }
+
+    public boolean postDelayed(Runnable action, long delayMillis) {
+        Window w = getWindow();
+        if (w != null) {
+            View v = w.getDecorView();
+            return v != null && v.postDelayed(action, delayMillis);
+        } else {
+            return false;
+        }
+    }
+
+}
diff --git a/app/src/main/java/com/hippo/ehviewer/ui/StartActivity.java b/app/src/main/java/com/hippo/ehviewer/ui/StartActivity.java
new file mode 100644
index 000000000..f4d9bcf1a
--- /dev/null
+++ b/app/src/main/java/com/hippo/ehviewer/ui/StartActivity.java
@@ -0,0 +1,29 @@
+/*
+ * 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.ui;
+
+import android.os.Bundle;
+
+import com.hippo.ehviewer.R;
+
+public class StartActivity extends AbsActionBarActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_start);
+    }
+}
diff --git a/app/src/main/java/com/hippo/ehviewer/util/EhUtils.java b/app/src/main/java/com/hippo/ehviewer/util/EhUtils.java
index 87c84970c..567c599eb 100644
--- a/app/src/main/java/com/hippo/ehviewer/util/EhUtils.java
+++ b/app/src/main/java/com/hippo/ehviewer/util/EhUtils.java
@@ -78,6 +78,4 @@ public final class EhUtils {
         }
         return CATEGORY_STRINGS[i][0];
     }
-
-
 }
diff --git a/app/src/main/java/com/hippo/util/Log.java b/app/src/main/java/com/hippo/util/Log.java
new file mode 100644
index 000000000..155aa85d7
--- /dev/null
+++ b/app/src/main/java/com/hippo/util/Log.java
@@ -0,0 +1,193 @@
+/*
+ * 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 com.hippo.ehviewer.BuildConfig;
+
+public class Log {
+
+    public static final String avoidNull(String str) {
+        return str == null ? TextUtils.STRING_NULL : str;
+    }
+    
+    /**
+     * It is {@link android.util.Log#v(String, String)}, only work when debug.
+     * @param tag Used to identify the source of a log message.  It usually identifies
+     *        the class or activity where the log call occurs.
+     * @param msg The message you would like logged.
+     */
+    public static int v(String tag, String msg) {
+        if (BuildConfig.DEBUG) {
+            return android.util.Log.v(tag, avoidNull(msg));
+        } else {
+            return 0;
+        }
+    }
+
+    /**
+     * It is {@link android.util.Log#v(String, String, Throwable)}, only work when debug.
+     * @param tag Used to identify the source of a log message.  It usually identifies
+     *        the class or activity where the log call occurs.
+     * @param msg The message you would like logged.
+     * @param tr An exception to log
+     */
+    public static int v(String tag, String msg, Throwable tr) {
+        if (BuildConfig.DEBUG) {
+            return android.util.Log.v(tag, avoidNull(msg), tr);
+        } else {
+            return 0;
+        }
+    }
+
+    /**
+     * It is {@link android.util.Log#d(String, String)}, only work when debug.
+     * @param tag Used to identify the source of a log message.  It usually identifies
+     *        the class or activity where the log call occurs.
+     * @param msg The message you would like logged.
+     */
+    public static int d(String tag, String msg) {
+        if (BuildConfig.DEBUG) {
+            return android.util.Log.d(tag, avoidNull(msg));
+        } else {
+            return 0;
+        }
+    }
+
+    /**
+     * It is {@link android.util.Log#d(String, String, Throwable)}, only work when debug.
+     * @param tag Used to identify the source of a log message.  It usually identifies
+     *        the class or activity where the log call occurs.
+     * @param msg The message you would like logged.
+     * @param tr An exception to log
+     */
+    public static int d(String tag, String msg, Throwable tr) {
+        if (BuildConfig.DEBUG) {
+            return android.util.Log.d(tag, avoidNull(msg), tr);
+        } else {
+            return 0;
+        }
+    }
+
+    /**
+     * It is {@link android.util.Log#i(String, String)}, only work when debug.
+     * @param tag Used to identify the source of a log message.  It usually identifies
+     *        the class or activity where the log call occurs.
+     * @param msg The message you would like logged.
+     */
+    public static int i(String tag, String msg) {
+        if (BuildConfig.DEBUG) {
+            return android.util.Log.i(tag, avoidNull(msg));
+        } else {
+            return 0;
+        }
+    }
+
+    /**
+     * It is {@link android.util.Log#i(String, String, Throwable)}, only work when debug.
+     * @param tag Used to identify the source of a log message.  It usually identifies
+     *        the class or activity where the log call occurs.
+     * @param msg The message you would like logged.
+     * @param tr An exception to log
+     */
+    public static int i(String tag, String msg, Throwable tr) {
+        if (BuildConfig.DEBUG) {
+            return android.util.Log.i(tag, avoidNull(msg), tr);
+        } else {
+            return 0;
+        }
+    }
+
+    /**
+     * It is {@link android.util.Log#w(String, String)}, only work when debug.
+     * @param tag Used to identify the source of a log message.  It usually identifies
+     *        the class or activity where the log call occurs.
+     * @param msg The message you would like logged.
+     */
+    public static int w(String tag, String msg) {
+        if (BuildConfig.DEBUG) {
+            return android.util.Log.w(tag, avoidNull(msg));
+        } else {
+            return 0;
+        }
+    }
+
+    /**
+     * It is {@link android.util.Log#w(String, String, Throwable)}, only work when debug.
+     * @param tag Used to identify the source of a log message.  It usually identifies
+     *        the class or activity where the log call occurs.
+     * @param msg The message you would like logged.
+     * @param tr An exception to log
+     */
+    public static int w(String tag, String msg, Throwable tr) {
+        if (BuildConfig.DEBUG) {
+            return android.util.Log.w(tag, avoidNull(msg), tr);
+        } else {
+            return 0;
+        }
+    }
+
+    /**
+     * It is {@link android.util.Log#w(String, Throwable)}, only work when debug.
+     * @param tag Used to identify the source of a log message.  It usually identifies
+     *        the class or activity where the log call occurs.
+     * @param tr An exception to log
+     */
+    public static int w(String tag, Throwable tr) {
+        if (BuildConfig.DEBUG) {
+            return android.util.Log.w(tag, tr);
+        } else {
+            return 0;
+        }
+    }
+
+    /**
+     * It is {@link android.util.Log#e(String, String)}, only work when debug.
+     * @param tag Used to identify the source of a log message.  It usually identifies
+     *        the class or activity where the log call occurs.
+     * @param msg The message you would like logged.
+     */
+    public static int e(String tag, String msg) {
+        if (BuildConfig.DEBUG) {
+            return android.util.Log.e(tag, avoidNull(msg));
+        } else {
+            return 0;
+        }
+    }
+
+    /**
+     * It is {@link android.util.Log#e(String, String, Throwable)}, only work when debug.
+     * @param tag Used to identify the source of a log message.  It usually identifies
+     *        the class or activity where the log call occurs.
+     * @param msg The message you would like logged.
+     * @param tr An exception to log
+     */
+    public static int e(String tag, String msg, Throwable tr) {
+        if (BuildConfig.DEBUG) {
+            return android.util.Log.e(tag, avoidNull(msg), tr);
+        } else {
+            return 0;
+        }
+    }
+
+    /**
+     * It is {@link android.util.Log#getStackTraceString(Throwable)}.<br>
+     * Handy function to get a loggable stack trace from a Throwable
+     * @param tr An exception to log
+     */
+    public static String getStackTraceString(Throwable tr) {
+        return android.util.Log.getStackTraceString(tr);
+    }
+}
diff --git a/app/src/main/java/com/hippo/util/TextUtils.java b/app/src/main/java/com/hippo/util/TextUtils.java
new file mode 100644
index 000000000..94103b116
--- /dev/null
+++ b/app/src/main/java/com/hippo/util/TextUtils.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 TextUtils {
+    
+    public static final String STRING_EMPTY = "";
+    public static final String STRING_NULL = "null";
+    
+}
diff --git a/app/src/main/res/layout/activity_start.xml b/app/src/main/res/layout/activity_start.xml
new file mode 100644
index 000000000..c70cc508d
--- /dev/null
+++ b/app/src/main/res/layout/activity_start.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ 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.
+  -->
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+</LinearLayout>
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
new file mode 100644
index 000000000..11c997bb0
--- /dev/null
+++ b/app/src/main/res/values/colors.xml
@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ 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.
+  -->
+<resources>
+
+    <color name="material_teal_500">#ff009688</color>
+    <color name="material_teal_700">#ff00796b</color>
+
+    <color name="material_deep_orange_500">#ffff5722</color>
+
+    <color name="material_orange_500">#ffff9800</color>
+
+    <color name="material_amber_500">#ffffc107</color>
+
+    <color name="primary">@color/material_teal_500</color>
+    <color name="primary_dark">@color/material_teal_700</color>
+    <color name="accent">#ffff6977</color>
+
+</resources>
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
index abbc72c71..fb763db78 100644
--- a/app/src/main/res/values/styles.xml
+++ b/app/src/main/res/values/styles.xml
@@ -15,9 +15,4 @@
   -->
 <resources>
 
-    <!-- Base application theme. -->
-    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
-        <!-- Customize your theme here. -->
-    </style>
-
 </resources>
diff --git a/app/src/main/res/values/themes.xml b/app/src/main/res/values/themes.xml
new file mode 100644
index 000000000..8eff99c64
--- /dev/null
+++ b/app/src/main/res/values/themes.xml
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ 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.
+  -->
+<resources>
+
+    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
+
+        <item name="colorPrimary">@color/primary</item>
+        <item name="colorPrimaryDark">@color/primary_dark</item>
+        <item name="colorAccent">@color/accent</item>
+
+    </style>
+
+</resources>