PhotoGalleryFragment.java 文件源码

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setRetainInstance(true);
    new FetchItemsTask().execute();

    Handler responseHandler = new Handler();
    mThumbnailDownloader = new ThumbnailDownloader<>(responseHandler);
    mThumbnailDownloader.setThumbnailDownloadListener(
        new ThumbnailDownloader.ThumbnailDownloadListener<PhotoHolder>() {
            @Override
            public void onThumbnailDownloaded(PhotoHolder photoHolder, Bitmap bitmap) {
                Drawable drawable = new BitmapDrawable(getResources(), bitmap);
                photoHolder.bindDrawable(drawable);
            }
        }
    );
    mThumbnailDownloader.start();
    mThumbnailDownloader.getLooper();
    Log.i(TAG, "Background thread started");
}