Bottom view unstable with System alert window

I'm using system alert window but not swiping properly even bottom view unstable

 LayoutInflater inflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
        View mView = inflater.inflate(R.layout.default, null);
        SwipeLayout swipeLayout = (SwipeLayout)mView. findViewById(R.id.swipelay);
        swipeLayout.setShowMode(SwipeLayout.ShowMode.LayDown);
        swipeLayout.setDragEdge(SwipeLayout.DragEdge.Top);
        WindowManager.LayoutParams params = new WindowManager.LayoutParams(
                WindowManager.LayoutParams.TYPE_SYSTEM_ALERT  ,
                   WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL|WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,  
               // |WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN,
                PixelFormat.TRANSLUCENT);
        params.gravity = Gravity.RIGHT | Gravity.TOP;
        WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);
        wm.addView(mView, params);

Inizia riproducendo la configurazione fornita di Android System alert window con AndroidSwipeLayout, concentrandoti sullo SwipeLayout configurato con LayDown e un Top drag edge. Confronta il comportamento dello swipe e la stabilità della bottom view all’interno di questa finestra con quelli di un layout normale, e considera conclusa la issue quando lo swipe segnalato funziona in modo affidabile senza che la bottom view sia instabile.