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A good practice in creating responsive applications is to make sure your main UI thread does the minimum amount of work. Any potentially long task that may hang your application should be handled in a different thread. Typical examples of such tasks are network operations, which involve unpredictable delays. Users will tolerate some pauses, especially if you provide feedback that something is in progress, but a frozen application gives them no clue.

In this article, we will create a simple image downloader that illustrates this pattern. We will populate a ListView with thumbnail images downloaded from the internet. Creating an asynchronous task that downloads in the background will keep our application fast.



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