java - Android Developer Page中mPlaceHolderBitmap的值是多少？

Question

我是 Android 开发的新手，我正在尝试复制使用 Async Task 在 gridview 上显示图像的示例，如 Google 的 Android 开发页面所示。我的问题是:如何在以下代码下声明或初始化 mPlaceHolderBitmap:这是谷歌代码的链接: Displaying Bitmaps in Your UI

 public void loadBitmap(int resId, ImageView imageView) {
    if (cancelPotentialWork(resId, imageView)) {
        final BitmapWorkerTask task = new BitmapWorkerTask(imageView);
        final AsyncDrawable asyncDrawable =
                new AsyncDrawable(getResources(), mPlaceHolderBitmap, task);
        imageView.setImageDrawable(asyncDrawable);
        task.execute(resId);
    }
}

Answer 1

正在转换 @Luksprog将评论转化为答案:

It represents your own Bitmap to be used as a placeholder while the actual image is loaded. You can download the sample and see the entire code.