置灰前
置灰前.jpg
置灰后
置灰后.jpg
给Activity的顶层View设置置灰，实现全局置灰效果。获取界面的根View：
View view = getActivity(). getWindow(). getDecorView();
Paint paint = new Paint();
ColorMatrix cm = new ColorMatrix();
cm.setSaturation(0);
paint.setColorFilter(new ColorMatrixColorFilter(cm));
view. setLayerType(View.LAYER_TYPE_HARDWARE, paint);
