android 清除缓存方法

获得应用的存储信息

private void getAppStorageInfo(String packageName){StorageStatsManager storageStatsManager = (StorageStatsManager) context.getSystemService(Context.STORAGE_STATS_SERVICE);StorageManager storageManager = (StorageManager) context.getSystemService(Context.STORAGE_SERVICE);List<StorageVolume> storageVolumes = storageManager.getStorageVolumes(); //app可能安装在外部存储上面,外部存储有一个唯一的UUID做区分UserHandle user = android.os.Process.myUserHandle();Log.d("zwt", ":::"+storageVolumes.size());try {for (StorageVolume storageVolume : storageVolumes) {final String uuidStr = storageVolume.getUuid();Log.d("zwt", "uuidStr:::"+uuidStr);final UUID uuid = uuidStr == null ? StorageManager.UUID_DEFAULT : UUID.fromString(uuidStr);StorageStats storageStats = storageStatsManager.queryStatsForPackage(uuid, packageName, user);//应用程序的大小。这包括 APK 文件、优化的编译器输出和解压的原生库long appBytes = storageStats.getAppBytes();//应用程序缓存数据的大小。这包括存储在 Context.getCacheDir() 和 Context.getCodeCacheDir() 下的文件long cacheBytes = storageStats.getCacheBytes();//应用程序所有数据的大小。这包括存储在 Context.getDataDir()、Context.getCacheDir()、Context.getCodeCacheDir() 下的文件long dataBytes = storageStats.getDataBytes();//主外部共享存储中所有缓存数据的大小。这包括存储在 Context.getExternalCacheDir() 下的文件long externalCacheBytes = storageStats.getExternalCacheBytes();                }}catch (PackageManager.NameNotFoundException | IOException e) {e.printStackTrace();}return ;}

需要声明权限

 <!-- 获得app缓存大小 --><uses-permissionandroid:name="android.permission.PACKAGE_USAGE_STATS"tools:ignore="ProtectedPermissions" />

清除应用数据缓存

在公版设置中的位置
清除数据：\packages\apps\Settings\src\com\android\tv\settings\device\apps\ClearDataPreference.java
清除缓存：\packages\apps\Settings\src\com\android\tv\settings\device\apps\ClearCachePreference.java

位置：\packages\apps\\Settings\src\com\android\tv\settings\device\apps\AppManagementFragment.java

主要调用方法，这两个方法都是不能被第三方应用调用的方法，必须是系统级的应用，且有系统的签名，第三方只能用反射的方法调用

am.clearApplicationUserData(packageName, new ClearUserDataObserver());
pm.deleteApplicationCacheFiles(packageName, new ClearUserDataObserver());

这两个方法要传入一个aidl服务，来回调通知数据是否清除成功

1.导入aidl

位置： frameworks/base/core/java/android/content/pm/IPackageDataObserver.aidl
将此aidl文件复制到项目aidl文件夹下，注意包名保持一致
aidl说明：https://blog.csdn.net/weixin_44128558/article/details/112154294

2.实现

	// 清除缓存public void clearCache(String packageName){if (context!=null){PackageManager pm = context.getPackageManager();pm.deleteApplicationCacheFiles(packageName, new ClearUserDataObserver());}else {Log.d(TAG, "clearCache() context is null");}}// 清除数据public void clearData(String packageName){if (context!=null){ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);boolean success = am.clearApplicationUserData(packageName, new ClearUserDataObserver());}else {Log.d(TAG, "clearData() context is null");}}//清除回调static class ClearUserDataObserver extends IPackageDataObserver.Stub {private final String TAG = "zwt:ClearUserDataObserver";@Overridepublic void onRemoveCompleted(String packageName, boolean succeeded) throws RemoteException {if (succeeded){Log.d(TAG, "清理成功");}else {Log.d(TAG, "清理失败");}}}// 卸载apkpublic void deleteApk(String packageName) {if (context == null){return ;}Uri uri = Uri.fromParts("package", packageName, null);Intent intent = new Intent(Intent.ACTION_DELETE, uri);intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);context.startActivity(intent);}

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