获取Android应用专属缓存存储目录的实例

// /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

/** * 获取应用专属缓存目录 * android 4.4及以上系统不需要申请SD卡读写权限 * 因此也不用考虑6.0系统动态申请SD卡读写权限问题，切随应用被卸载后自动清空 不会污染用户存储空间 * @param context 上下文 * @param type 文件夹类型 可以为空，为空则返回API得到的一级目录 * @return 缓存文件夹 如果没有SD卡或SD卡有问题则返回内存缓存目录，否则优先返回SD卡缓存目录 */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;}/** * 获取SD卡缓存目录 * @param context 上下文 * @param type 文件夹类型 如果为空则返回 /storage/emulated/0/Android/data/app_package_name/cache *       否则返回对应类型的文件夹如Environment.DIRECTORY_PICTURES 对应的文件夹为 .../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 自定义文件夹名称 * @return 缓存目录文件夹 或 null（无SD卡或SD卡挂载失败） */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){// 有些手机需要通过自定义目录      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;}/** * 获取内存缓存目录 * @param type 子目录，可以为空，为空直接返回一级目录 * @return 缓存目录文件夹 或 null（创建目录文件失败） * 注：该方法获取的目录是能供当前应用自己使用，外部应用没有读写权限，如 系统相机应用 */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;}