如何改变 android 代码的 buffered image 和 graphics？

不知道你为什么传进去的是BufferedImage，返回值也是BufferedImage。
Android 中图片类用Bitmap，网上搜索Bitmap用法，或查看Api

 public static Bitmap readBitmap(Context context, int resId) {
 BitmapFactory.Options opt = new BitmapFactory.Options();
 opt.inPreferredConfig = Bitmap.Config.RGB_565;
 opt.inPurgeable = true;
 opt.inInputShareable = true;
 // 获取资源图片
InputStream is = context.getResources().openRawResource(resId);
 return BitmapFactory.decodeStream(is, null, opt);
 }
public static Drawable getImageFromAssetsFile(Context context,
        String fileName) {
    Drawable image = null;
    BitmapFactory.Options opt = new BitmapFactory.Options();
    opt.inPreferredConfig = Bitmap.Config.RGB_565;
    opt.inPurgeable = true;
    opt.inInputShareable = true;
    AssetManager am = context.getResources().getAssets();
    try {
        InputStream is = am.open(fileName);
        Bitmap bmp = BitmapFactory.decodeStream(is, null, opt);
        image = new BitmapDrawable(bmp);
        is.close();
        bmp = null;
    } catch (IOException e) {
        e.printStackTrace();
    }
    return image;
}

也可以和Drawable互相转换