Android Programming: The Big Nerd Ranch Guide, 2nd Edition

Assembling a Background Thread

Create a new class called ThumbnailDownloader that extends HandlerThread. Then give it a constructor, a stub implementation of a method called queueThumbnail(), and an override of the quit() that signals when your thread has quit (you will need this later) (Listing 24.4).

Listing 24.4  Initial thread code (ThumbnailDownloader.java)

public class ThumbnailDownloader<T> extends HandlerThread {
    private static final String TAG = "ThumbnailDownloader";

    private boolean mHasQuit = false;

    public ThumbnailDownloader() {
        super(TAG);
    }

    @Override
    public boolean quit() {
        mHasQuit = true;
        return super.quit();
    }

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

Notice you ...