Request runtime permissions from v4.Fragment and have callback go to Fragment?

Question

I\'m having a weird issue that is causing a conflict. I had to switch to native Fragments to fix it, but there are bugs with that.

My original problem:

Answer 1

If you need to get the permissionResult in fragment v4 make sure you use

Fragment.requestPermission(String[], int);

instead of

AppCompat.requestPermission(Activity, String[], int)

Check out this answer!

Answer 2

Just use requestPermission("your permission/s in string array",your request code) simply no need to use Fragment.requestPermissons(String[],int );

This method in your fragment calls requestPermissions of android.support.v4.app.Fragment class i.e

public final void requestPermissions(@NonNull String[] permissions, int requestCode) {
        if (mHost == null) {
            throw new IllegalStateException("Fragment " + this + " not attached to Activity");
        }
        mHost.onRequestPermissionsFromFragment(this, permissions, requestCode);
    }

Answer 3

At the moment the most stable solution is doing it by hand. I myself resolved it simply by notifying child fragments from the parent fragments.

if (fragment.getParentFragment() != null) {
                            Fragment parentFragment = fragment.getParentFragment();
                            try {
                                ChildFragmentPermissionRegistry registry = (ChildFragmentPermissionRegistry) parentFragment;
                                registry.registerPermissionListener((ChildFragmentPermissionCallback) fragment);
                                parentFragment.requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE}, STORAGE_PERMISSION_REQUEST_CODE);
                            } catch (ClassCastException e) {
                                Log.e(PermissionVerifier.class.getSimpleName(), e.getMessage());
                            }
                        } else {
                            fragment.requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE}, STORAGE_PERMISSION_REQUEST_CODE);
                        }

Where parent fragment implements interface ChildFragmentPermissionRegistry and registers child fragment,

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if (callback != null) {
        callback.onRequestPermissionsResult(requestCode, permissions, grantResults);
        callback = null;
    }
}

and child fragments implements ChildFragmentPermissionCallback

and interfaces are something like this:

public interface ChildFragmentPermissionCallback {
    void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults);
}

public interface ChildFragmentPermissionRegistry {
    void registerPermissionListener(ChildFragmentPermissionCallback callback);
}

Answer 4

This behavior seems to be present in the v4 Fragment support class requestPermissions in Fragment. The Activity/FragmentCompat implementations exist for people who wish to use the native classes with the extended functionality on API levels between 11 and 23.