Asynchronous Android Programming - Second Edition

Loading data with Loader

So far, we have only described theoretical entities and the classes available on the API so now is the right time to show these concepts with a simple example.

In our example we will show you how to use LoaderManager, LoaderCallback, and a Loader to present an Activity that lists the name of users that are currently online for a chat application.

First, we are going to create an Activity that will act as a client to the LoaderManager and will have three buttons, INIT, RESTART, and DESTROY; to initialize the loader, to restart, and to destroy the loader respectively. The Activity will receive the LoaderCallbacks callback directly since it implements that interface as member functions:

public class WhoIsOnlineActivity extends ...