package com.bignerdranch.android.photogallery;

import android.os.HandlerThread;
import android.util.Log;

public class ThumbnailDownloader<T> extends HandlerThread {

    private static final String TAG = "ThumbnailDownloader";

    public ThumbnailDownloader() {
        super(TAG);
    }

    public void queueThumbnail(T target, String url) {
        Log.i(TAG, "Gor a URL: " + url);
    }
}

Create class that will manage image download in background
Create class that will manage image download in background
