How to make Window Manager window draggable in android

Question

I am using Window Manager to show my Button above all window. But the problem is I want to make it draggable but the touch event is not working as expected when I tried to go down floating window moves up when I tried to move it right it move towards left. Please help me out on this.

Here is my code -

`

@SuppressLint("ClickableViewAccessibility")

 @Override public void onCreate() {
 super.onCreate(); Log.e("Cust", "Started");
 if (mFloatingView == null) { 
mFloatingView = LayoutInflater.from(getApplicationContext()).inflate(R.layout.bubble_layout, null); 
mFloatingView.setVisibility(View.GONE); int LAYOUT_FLAG; 
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {        
     LAYOUT_FLAG = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;      
       params = new WindowManager.LayoutParams(                     WindowManager.LayoutParams.WRAP_CONTENT,                     WindowManager.LayoutParams.WRAP_CONTENT,
 LAYOUT_FLAG,                    
 WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,               
      PixelFormat.TRANSLUCENT);         } else {           
  LAYOUT_FLAG = WindowManager.LayoutParams.TYPE_PHONE;       
      params = new WindowManager.LayoutParams(                     WindowManager.LayoutParams.WRAP_CONTENT,                     WindowManager.LayoutParams.WRAP_CONTENT,                  
   LAYOUT_FLAG,                    
 WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,                    
 PixelFormat.TRANSLUCENT);         }          //Specify the view position
         params.gravity = Gravity.BOTTOM | Gravity.RIGHT;        //Initially view will be added to bottom-left corner  //Add the view to the window
        mWindowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
        mWindowManager.addView(mFloatingView, params);
    }
mFloatingView.findViewById(R.id.root_container).setOnTouchListener(new View.OnTouchListener() { 
private int initialX; 
private int initialY; 
private float initialTouchX;
 private float initialTouchY;                    

@Override
                    public boolean onTouch(View v, MotionEvent event) {
                        Log.d("AD", "Action E" + event);
                        switch (event.getAction()) {
                            case MotionEvent.ACTION_DOWN:
                                Log.d("AD", "Action Down");
                                initialX = params.x;
                                initialY = params.y;
                                initialTouchX = event.getRawX();
                                initialTouchY = event.getRawY();
                                return true;
                            case MotionEvent.ACTION_UP:
                                Log.d("AD", "Action Up");
                                int Xdiff = (int) (event.getRawX() - initialTouchX);
                                int Ydiff = (int) (event.getRawY() - initialTouchY);
                                if (Xdiff < 10 && Ydiff < 10) {

                                }
                                return true;
                            case MotionEvent.ACTION_MOVE:
                                Log.d("AD", "Action Move");
                                params.x = initialX + (int) (event.getRawX() - initialTouchX);
                                params.y = initialY + (int) (event.getRawY() - initialTouchY);
                                mWindowManager.updateViewLayout(mFloatingView, params);
                                return true;
                        }
                        return false;
                    }
                });
}

when i tried to go down floating window moves up when i tried to move it right it move towards left. Please help me out on this.