特殊纪念日专用灰色代码//设置整个APP的所有活动页面变为黑白色；屏蔽掉色彩，特殊节日需要用到； ` private void initGrayScreen(){ Paint paint = new Paint(); ColorMatrix cm = new ColorMatrix(); cm.setSaturation(0); paint.setColorFilter(new ColorMatrixColorFilter(cm)); getWindow().getDecorView().setLayerType(View.LAYER_TYPE_HARDWARE, paint); }```` html { height: 100%; FILTER: gray; -webkit-filter: grayscale(100%); }```