How to take CLEAR_APP_CACHE permission in Android Marshmallow at runtime?

Question

Code:

void clearCache() {

    if (mClearCacheObserver == null) {
        mClearCacheObserver = new CachePackageDataObserver();
    }         


        

Answer 1

From Android M -> CLEAR_APP_CACHE, Protection level: system|signature

Android 6.0 does not change the behavior of normal permissions (all non-dangerous permissions including normal, system, and signature permissions).

So it is not possible to ask for that permission in runtime. To be more precise

A signature|system permission, meaning that it can only be held by apps that are signed with the firmware's signing key or are installed on the system partition (e.g., by a rooted device user). From this stackoverflow Q/A.

Docs: https://source.android.com/devices/tech/config/runtime_perms.html#affected-permissions