@Override
 protected void onDraw(Canvas canvas) {
   canvas.drawColor(Color.WHITE);
   super.onDraw(canvas);
   if (getmBitmapIndex() == 0) {
     Paint tp = new Paint();
     tp.setAlpha(200);
     canvas.drawBitmap(mEmptyBitmap, null, getmAreaRect(), tp);
   }
 }