ImageFetcher.java 文件源码

/**
 * Once the image is downloaded, associates it to the imageView
 */
@Override
protected void onPostExecute(Bitmap bitmap) {
    if (isCancelled()) {
        bitmap = null;
    }
    addBitmapToCache(position, bitmap);
    if (imageViewReference != null) {
        ImageView imageView = imageViewReference.get();
        BitmapFetcherTask bitmapDownloaderTask = getBitmapDownloaderTask(imageView);
        if (this == bitmapDownloaderTask) {
            imageView.setImageBitmap(bitmap);
            Animation anim = AnimationUtils.loadAnimation(imageView.getContext(), android.R.anim.fade_in);
            imageView.setAnimation(anim);
            anim.start();
        }
    } else {
        setInvisible();
    }
}