(Android loads pictures asynchronously. To demonstrate the function of ListView to load pictures asynchronously, the method of reading the picture return stream based on the url is the first. In order to facilitate the demonstration, the link of the solicitation image is fixed first, and it will be updated every time a picture is read. The interface is relatively simple. Of course, you can make it better. For example, many good software have this effect. First, a loading effect. Once there is a picture, remove loading and display the picture.)
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