ImageHelper.java 文件源码

public static Bitmap handleImageGrayEffect(Bitmap bitmap) {
  Bitmap bmp =
      Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);
  float[] colorMatrixValue = new float[] {
      0.33f, 0.59f, 0.11f, 0, 0, 0.33f, 0.59f, 0.11f, 0, 0, 0.33f, 0.59f, 0.11f, 0, 0, 0, 0, 0, 1,
      0
  };
  ColorMatrix colorMatrix = new ColorMatrix();
  colorMatrix.set(colorMatrixValue);

  Canvas canvas = new Canvas(bmp);
  Paint paint = new Paint();
  paint.setColorFilter(new ColorMatrixColorFilter(colorMatrix));
  canvas.drawBitmap(bitmap, 0, 0, paint);
  return bmp;
}