android替图片去色,返回灰度图片

就是大家喜闻乐见的图片去色，返回黑白的图片，具体的方法就是为bitmap添加colorFilter，废话不多说了，上代码：

 public static Bitmap getGreyImage(Bitmap old) {               int width, height;               height = old.getHeight();               width = old.getWidth();                   Bitmap new= Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);               Canvas c = new Canvas(old);               Paint paint = new Paint();               ColorMatrix cm = new ColorMatrix();               cm.setSaturation(0);               ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);               paint.setColorFilter(f);               c.drawBitmap(new, 0, 0, paint);               return new;           }   

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