Use onBackPressed instead of onKeyDown/onKeyUp

        }

    }

    @Override

    public boolean onKeyDown(int keyCode, KeyEvent event) {

        if (keyCode == KeyEvent.KEYCODE_BACK) {

            event.startTracking();

            return true;

        }

        return super.onKeyDown(keyCode, event);

    }

    @Override

    public boolean onKeyUp(int keyCode, KeyEvent event) {

        if (keyCode == KeyEvent.KEYCODE_BACK

                && event.isTracking() && !event.isCanceled()) {

    public void onBackPressed() {

        setResultAndFinish();

            return true;

        }

        return super.onKeyUp(keyCode, event);

        super.onBackPressed();

    }

    private int computePermissionGrantState(PackageInfo callingPackageInfo,