可能存在内存泄漏

frequently_called_binding_function (My_GifImageView_Pool pool) {
    GifImageView gifImageView= pool.get();

    gifImageView.setImageBitmap(a small size bitmap as a thumbnail);

    runOnWorkerThread(() -> {
        ParcelFileDescriptor pfd = download a gif from server();
        runOnUiThread(() -> {
            GifDrawable gifDrawable = new GifDrawable(pfd.getFileDescriptor());
            gifImageView.setImageDrawable(gifDrawable);
            pfd.close();
        }
    });
}