android 为 view 添加遮罩

@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);if (mChecked) {Rect rect1 = getRect(canvas);Paint paint = new Paint();paint.setColor(0x55FFFFFF);paint.setStyle(Paint.Style.FILL);canvas.drawRect(rect1, paint);}}Rect getRect(Canvas canvas) {Rect rect = canvas.getClipBounds();rect.bottom -= getPaddingBottom();rect.right -= getPaddingRight();rect.left += getPaddingLeft();rect.top += getPaddingTop();return rect;}