Android的AlertDialog，setView后去除黑色边框

		faceDialog = new AlertDialog.Builder(ctx).create();
		GridView faceView = (GridView) LayoutInflater.from(ctx).inflate(R.layout.facedialog, null);
		faceView.setCacheColorHint(0);
		faceView.setAdapter(this);

		//0,0,0,0设置去除dialog的四周边框
		faceDialog.setView(faceView,0,0,0,0);