ColorMatrixColorFilter颜色过滤

Drawable mDrawable = context.getResources().getDrawable(R.drawable.face_icon);     //Make this drawable mutable.     //A mutable drawable is guaranteed to not share its state with any other drawable.     mDrawable.mutate();     ColorMatrix cm = new ColorMatrix();     cm.setSaturation(0);     ColorMatrixColorFilter cf = new ColorMatrixColorFilter(cm);     mDrawable.setColorFilter(cf);