Utils.java 文件源码

public static Bitmap darkenBitmap(Bitmap bitmap) {
    Canvas canvas = new Canvas(bitmap);
    Paint paint = new Paint(Color.RED);
    ColorFilter filter = new LightingColorFilter(0xffbababa, 0x00000000);

    paint.setColorFilter(filter);
    canvas.drawBitmap(bitmap, new Matrix(), paint);

    return bitmap;
}