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Click New  in the toolbar.In the window that appears, open the Android folder, select Android Application Project, and click Next. Figure 1. The New Android App Project wizard in Eclipse. Fi

Class Overview Defines a message containing a description and arbitrary data object that can be sent to a Handler. This object contains two extra int fields and an extra object field that allow

Class Overview Low-level class holding the list of messages to be dispatched by a Looper. Messages are not added directly to a MessageQueue, but rather throughMessageQueue.IdleHandler objects

Class Overview A Handler allows you to send and process Message and Runnable objects associated with a thread's MessageQueue. Each Handler instance is associated with a single thread and that

Android uses a file system that's similar to disk-based file systems on other platforms. This lesson describes how to work with the Android file system to read and write files with the FileAPIs. A 

Overview An asynchronous callback-based Http client for Android built on top of Apache’s HttpClient libraries. All requests are made outside of your app’s main UI thread, but any callback logic w

Class Overview Class used to run a message loop for a thread. Threads by default do not have a message loop associated with them; to create one, call prepare() in the thread that is to run the

Get the Android SDK The Android SDK provides you the API libraries and developer tools necessary to build, test, and debug apps for Android. If you're a new Android developer, we recommend you downl

As a user navigates through, out of, and back to your app, theActivity instances in your app transition between different states in their lifecycle. For instance, when your activity starts for the f