// /storage/emulated/0/Android/data/app_package_name/files/PicturesContent.getExternalFilesDir(Environment.DIRECTORY_PICTURES); // /storage/emulated/0/Android/data/app_package_name/cacheContent.getExternalCacheDir(); 

Content. getCacheDir(); // /data/data/app_package_name/cacheContent. getFilesDir(); // /data/data/app_package_name/files

/** * 獲取應(yīng)用專屬緩存目錄 * android 4.4及以上系統(tǒng)不需要申請SD卡讀寫權(quán)限 * 因此也不用考慮6.0系統(tǒng)動態(tài)申請SD卡讀寫權(quán)限問題，切隨應(yīng)用被卸載后自動清空 不會污染用戶存儲空間 * @param context 上下文 * @param type 文件夾類型 可以為空，為空則返回API得到的一級目錄 * @return 緩存文件夾 如果沒有SD卡或SD卡有問題則返回內(nèi)存緩存目錄，否則優(yōu)先返回SD卡緩存目錄 */public static File getCacheDirectory(Context context,String type) {  File appCacheDir = getExternalCacheDirectory(context,type);  if (appCacheDir == null){    appCacheDir = getInternalCacheDirectory(context,type);  }  if (appCacheDir == null){    Log.e("getCacheDirectory","getCacheDirectory fail ,the reason is mobile phone unknown exception !");  }else {    if (!appCacheDir.exists()&&!appCacheDir.mkdirs()){      Log.e("getCacheDirectory","getCacheDirectory fail ,the reason is make directory fail !");    }  }  return appCacheDir;}/** * 獲取SD卡緩存目錄 * @param context 上下文 * @param type 文件夾類型 如果為空則返回 /storage/emulated/0/Android/data/app_package_name/cache *       否則返回對應(yīng)類型的文件夾如Environment.DIRECTORY_PICTURES 對應(yīng)的文件夾為 .../data/app_package_name/files/Pictures * {@link android.os.Environment#DIRECTORY_MUSIC}, * {@link android.os.Environment#DIRECTORY_PODCASTS}, * {@link android.os.Environment#DIRECTORY_RINGTONES}, * {@link android.os.Environment#DIRECTORY_ALARMS}, * {@link android.os.Environment#DIRECTORY_NOTIFICATIONS}, * {@link android.os.Environment#DIRECTORY_PICTURES}, or * {@link android.os.Environment#DIRECTORY_MOVIES}.or 自定義文件夾名稱 * @return 緩存目錄文件夾 或 null（無SD卡或SD卡掛載失?。?*/public static File getExternalCacheDirectory(Context context,String type) {  File appCacheDir = null;  if( Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {    if (TextUtils.isEmpty(type)){      appCacheDir = context.getExternalCacheDir();    }else {      appCacheDir = context.getExternalFilesDir(type);    }    if (appCacheDir == null){// 有些手機需要通過自定義目錄      appCacheDir = new File(Environment.getExternalStorageDirectory(),"Android/data/"+context.getPackageName()+"/cache/"+type);    }    if (appCacheDir == null){      Log.e("getExternalDirectory","getExternalDirectory fail ,the reason is sdCard unknown exception !");    }else {      if (!appCacheDir.exists()&&!appCacheDir.mkdirs()){        Log.e("getExternalDirectory","getExternalDirectory fail ,the reason is make directory fail !");      }    }  }else {    Log.e("getExternalDirectory","getExternalDirectory fail ,the reason is sdCard nonexistence or sdCard mount fail !");  }  return appCacheDir;}/** * 獲取內(nèi)存緩存目錄 * @param type 子目錄，可以為空，為空直接返回一級目錄 * @return 緩存目錄文件夾 或 null（創(chuàng)建目錄文件失敗） * 注：該方法獲取的目錄是能供當(dāng)前應(yīng)用自己使用，外部應(yīng)用沒有讀寫權(quán)限，如 系統(tǒng)相機應(yīng)用 */public static File getInternalCacheDirectory(Context context,String type) {  File appCacheDir = null;  if (TextUtils.isEmpty(type)){    appCacheDir = context.getCacheDir();// /data/data/app_package_name/cache  }else {    appCacheDir = new File(context.getFilesDir(),type);// /data/data/app_package_name/files/type  }  if (!appCacheDir.exists()&&!appCacheDir.mkdirs()){    Log.e("getInternalDirectory","getInternalDirectory fail ,the reason is make directory fail !");  }  return appCacheDir;}