LevelListImageFetchTask.java 文件源码

@Override
public Drawable loadFromDiskCache(ImageCache cache, Resources res) {
    if(cache == null)
        return null;
    LevelListDrawable sld = new LevelListDrawable();
    for (int i = 0; i < urls.size(); i++) {
        Bitmap bmp = cache.getBitmapFromDiskCache(getStoreKey(i));
        if (bmp == null)
            return null;
        cache.addBitmapToCache(getStoreKey(i), bmp);
        sld.addLevel(levels.get(i)[0], levels.get(i)[1],
                new BitmapDrawable(res, bmp));
    }
    return sld;
}