Asynchronous updating

In the basics guide, we built a simple todo application. Every time an action was dispatched, the state was updated immediately.

In this guide, we will build a different, asynchronous application.

If a user performs an action while the user interface thread is blocked, and the application doesn’t respond within 5 seconds, the Android system will show an “Application Not Responding” dialog: If you attempt to make a network call on more recent versions of Android (Honeycomb and newer) your application will actually crash, as these newer versions are much stricter about misusing the user interface thread.

Anything that makes your app crash (or users think it’s crashed) can definitely be called “Ugly”.

To avoid freezing and crashing of an Android application, network calls need to be performed in the background.

One way of doing is by using a Runnable that contains the code you want to run in the background, and running that on a new thread.

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Any state is always owned by some specific component, and any data or UI derived from that state can only affect components "below" them in the tree.It will use the Reddit API to show the current headlines for a selected subreddit. When you call an asynchronous API, there are two crucial moments in time: the moment you start the call, and the moment when you receive an answer (or a timeout).Each of these two moments usually require a change in the application state; to do that, you need to dispatch normal actions that will be processed by reducers synchronously.We’ve compared and contrasted several methods, and along with some code examples, will provide some basic insight into using what we think is the best method of making network calls in an Android application.The easiest way to make a network call when writing Android native code is to make the call directly on the user interface thread: Although this might seem to work with short network calls on early versions of Android, this is an ugly way of performing this task.

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