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

 
    <uses-permission
        android: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";
        @Override
        public 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apk
    public 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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