Показать PopupMenu в режиме FullScreen

    public static void hideDefaultControls(@NonNull final Activity activity) {
        activity.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
        activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
 
        final Window window = activity.getWindow();
 
        if (window == null) {
            return;
        }
 
        final View decorView = window.getDecorView();
 
        if (decorView != null) {
            int uiOptions = decorView.getSystemUiVisibility();
 
            if (Build.VERSION.SDK_INT >= 14) {
                uiOptions |= View.SYSTEM_UI_FLAG_LOW_PROFILE;
            }
 
            if (Build.VERSION.SDK_INT >= 16) {
                uiOptions |= View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
            }
 
            if (Build.VERSION.SDK_INT >= 19) {
                uiOptions |= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
            }
 
            decorView.setSystemUiVisibility(uiOptions);
        }
    }

android.widget.PopupMenu;
 
 PopupMenu popupMenu = new PopupMenu(context, anchor);
//init code...
popupMenu.show();