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4 <p>This article discusses the threading model used by Android applications and how applications can ensure best UI performance by spawning worker threads to handle long-running operations, rather than handling them in the main thread. The article also explains the API that your application can use to interact with Android UI toolkit components running on the main thread and spawn managed worker threads. </p>
20 <p>This single-thread model can yield poor performance unless your application
24 can be dispatched, including drawing events, while the long operation
29 <p>If you want to see how bad this can look, write a simple application
57 <code>ImageView</code> is manipulated on a worker thread, which can cause really
58 weird problems. Tracking down and fixing such bugs can be difficult and
72 <p>You can use any of these classes and methods to correct the previous code example:</p>
104 you. Our previous example can easily be rewritten with
121 <p>As you can see, <code>AsyncTask</code> <em>must</em> be used by subclassing
123 instance has to be created on the UI thread and can be executed only once. You
124 can read the <a
130 <li>You can specify the type, using generics, of the parameters, the progress values and the final value of the task</li>
134 <li>You can call <a href="http://developer.android.com/reference/android/os/AsyncTask.html#publishProgress%28Progress...%29">publishProgress()</a> at anytime in <a href="http://developer.android.com/reference/android/os/AsyncTask.html#doInBackground%28Params...%29">doInBackground()</a> to execute <a href="http://developer.android.com/reference/android/os/AsyncTask.html#onProgressUpdate%28Progress...%29">onProgressUpdate()</a> on the UI thread</li><li>You can cancel the task at any time, from any thread</li>
137 <p>In addition to the official documentation, you can read several complex examples in the source code of Shelves (<a href="http://code.google.com/p/shelves/source/browse/trunk/Shelves/src/org/curiouscreature/android/shelves/activity/ShelvesActivity.java">ShelvesActivity.java</a> and <a href="http://code.google.com/p/shelves/source/browse/trunk/Shelves/src/org/curiouscreature/android/shelves/activity/AddBookActivity.java">AddBookActivity.java</a>) and Photostream (<a href="http://code.google.com/p/apps-for-android/source/browse/trunk/Photostream/src/com/google/android/photostream/LoginActivity.java">LoginActivity.java</a>, <a href="http://code.google.com/p/apps-for-android/source/browse/trunk/Photostream/src/com/google/android/photostream/PhotostreamActivity.java">PhotostreamActivity.java</a> and <a href="http://code.google.com/p/apps-for-android/source/browse/trunk/Photostream/src/com/google/android/photostream/ViewPhotoActivity.java">ViewPhotoActivity.java</a>). We highly recommend reading the source code of <a href="http://code.google.com/p/shelves/">Shelves</a> to see how to persist tasks across configuration changes and how to cancel them properly when the activity is destroyed.</p>
