Add eh gallery spider

app/src/main/java/com/hippo/ehviewer/AppConfig.java

@@ -0,0 +1,71 @@
+/*
+ * Copyright 2016 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.ehviewer;
+
+import android.content.Context;
+import android.os.Environment;
+import android.support.annotation.Nullable;
+
+import com.hippo.yorozuya.FileUtils;
+
+import java.io.File;
+
+public class AppConfig {
+
+    private static final String APP_DIRNAME = "EhViewer";
+
+    private static final String SPIDER_INFO = "spider_info";
+    private static final String DOWNLOAD = "download";
+
+    private static Context sContext;
+
+    public static void initialize(Context context) {
+        sContext = context.getApplicationContext();
+    }
+
+    public static File getSpiderInfoCacheDir() {
+        File dir = new File(sContext.getCacheDir(), SPIDER_INFO);
+        return FileUtils.ensureDirectory(dir) ? dir : null;
+    }
+
+    @Nullable
+    public static File getExternalAppDir() {
+        if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {
+            File dir = new File(Environment.getExternalStorageDirectory(), APP_DIRNAME);
+            return FileUtils.ensureDirectory(dir) ? dir : null;
+        }
+        return null;
+    }
+
+    /**
+     * mkdirs and get
+     */
+    @Nullable
+    public static File getDirInAppDir(String filename) {
+        File appFolder = getExternalAppDir();
+        if (appFolder != null) {
+            File dir = new File(appFolder, filename);
+            return FileUtils.ensureDirectory(dir) ? dir : null;
+        }
+        return null;
+    }
+
+    @Nullable
+    public static File getDefaultDownloadDir() {
+        return getDirInAppDir(DOWNLOAD);
+    }
+}