onRequestPermissionsResult not being called in dialog fragment

Question

I have started to work on Android M runtime permission. Here I am facing the issue that if requestPermissions is called from Dialog Fragment class then onRequestPermissionsResult not getting called in the same Dialog fragment class. But if requestPermissions is called from Activity class or Fragment class then onRequestPermissionsResult method get called in the same class.

Here is my sample code:

public class ContactPickerDialog extends DialogFragment {
    private static final int READ_CONTACTS_REQUEST_CODE = 12;
    private Context mContext;

    private void loadContact() {
        if(hasPermission(mContext, Manifest.permission.READ_CONTACTS)){
            new ContactSyncTask().execute();
        } else {
            this.requestPermissions(new String[]{Manifest.permission.READ_CONTACTS}, READ_CONTACTS_REQUEST_CODE);
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        Logger.d("TAG", "dialog onRequestPermissionsResult");
        switch (requestCode) {
            case READ_CONTACTS_REQUEST_CODE:
                // Check Permissions Granted or not
                if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    new ContactSyncTask().execute();
                } else {
                    // Permission Denied
                    Toast.makeText(getActivity(), "Read contact permission is denied", Toast.LENGTH_SHORT).show();
                }
            break;
            default:
                super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        }
    }

    private static boolean hasPermission(Context context, String permission){
        return ContextCompat.checkSelfPermission(context, permission) == PackageManager.PERMISSION_GRANTED;
    }

} 

Here in the code I am calling requestPermissions method of Dialog Fragment class. So I am expecting to get result in same class.

Any help is appreciated. Thanks in advance!

---

EDIT: Here I am adding more detail, so that it will be more helpful to others. Previously I have used getChildFragmentManager() to show the DialogFragment.

ContactPickerDialog dialog = new ContactPickerDialog();
dialog.show(getChildFragmentManager(), "Contact Picker");

But As @CommonWare asked me to use activity to show the DialogFragment. I have made following changes and it works.

ContactPickerDialog dialog = new ContactPickerDialog();
dialog.show(getActivity().getSupportFragmentManager(), "Contact Picker");

Answer 1

There appears to be a bug in Android, where nested fragments do not support the onRequestPermissionsResult() callback. For a DialogFragment, a workaround appears to be to have the fragment wanting to show the dialog call a method on the hosting activity, and the activity shows the DialogFragment itself.