Android 图片设置为灰色

1.图片设置为灰色

source：图片路经源

dest：图片目的地

public static void toGrayImage(String source, String dest)

    {

        try

        {

            Bitmap bitmap = BitmapFactory.decodeFile(source);

            int width = bitmap.getWidth();

            int height = bitmap.getHeight();

            Bitmap grayImg = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);

            // 

            Canvas canvas = new Canvas(grayImg);

            Paint paint = new Paint();

            ColorMatrix colorMatrix = new ColorMatrix();

            colorMatrix.setSaturation(0);

            ColorMatrixColorFilter colorMatrixFilter = new ColorMatrixColorFilter(

                    colorMatrix);

            paint.setColorFilter(colorMatrixFilter);

            canvas.drawBitmap(bitmap, 0, 0, paint);

            // canvas.

            File file = new File(dest);

            boolean success = file.createNewFile();

            FileOutputStream stream = new FileOutputStream(file);

            grayImg.compress(CompressFormat.JPEG, 100, stream);

            stream.flush();

            stream.close();

            bitmap.recycle();

            grayImg.recycle();

        }

        catch (Exception e)

        {

            @SuppressWarnings("unused")

            String msg = e.getMessage();

        }

    }