Android clear app cache

The first one is

Use ActivityManager Medium clearApplicationUserData Method , The code is as follows ：

ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
am.clearApplicationUserData();

The problem with this approach is that it doesn't just clear cache, Jointly applied data Also deleted . As shown in the figure below ：

The second kind

Use PackageManager Medium deleteApplicationCacheFiles Method , This API It's hidden , So you need to use reflection to call , The code is as follows ：

PackageManager packageManager = context.getPackageManager();
Method method;
try {
    
    method = PackageManager.class.getDeclaredMethod("deleteApplicationCacheFiles", String.class, IPackageDataObserver.class);
    method.invoke(packageManager, packageName, new ClearUserDataObserver());
} catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
    
    e.printStackTrace();
}

static class ClearUserDataObserver extends IPackageDataObserver.Stub {
    
    public void onRemoveCompleted(final String packageName, final boolean succeeded) {
    
        Log.i(TAG, "IPackageDataObserver succeeded: " + succeeded);
    }
}

This method will only clear cache, If necessary, just clear the cache , It can be in this way .IPackageDataObserver You need to put yourself in the project aidi In the folder , As shown in the figure below ：

Both methods require system permission , It can be called successfully only when it is declared as a system application and signed by the system .