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Additional info for Android Fragmentation Management How-to

Example text

This is because setImageBitmap() is executed in the thread created by us and not in the UI thread, violating the second rule expressed above (this is not allowed since the UI thread is not thread-safe, that is, it is not assured that concurrent access to an element doesn't cause problems). Before we solve this problem, let me show you the innermost structures introduced by the Android system to manage threads—the Looper and Handler classes. An instance of the first class is simply used to run a message loop in a thread that will be handled by an instance of the second class.

A widget here is, a visual element that can be expanded to occupy all the available space of the ActionBar; in the following code, we will implement a fake search entry—initially on the ActionBar there is only the Search button: After selecting this element, it will appear expanded, as shown in the following screenshot: 1. info Instant Android Fragmentation Management How-to 2. getActionView(); return true; } 3. com/apk/res/android">

4.

Another important class, available since API level 3, is AsyncTask. If you have worked on an application using background threads, it is probable that you have used it since it is intended for this purpose; to facilitate the managing of the threads, and to avoid all the headache and the error-prone code of the Looper and Handler classes. Its definition is particular. It uses generics; that is, there are some parameters indicated with Params, Progress, and Result that identify the signature of some functions used internally to manage threads.

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