Android implementation of listview asynchronously loading pictures

This article describes the method of implementing listview to load pictures asynchronously with an example. Share with you for your reference. The details are as follows:

Listview asynchronously loading pictures is a very practical method. Generally, it is better to use this method to obtain picture resources through the network. It has a good user experience and does not need users to wait. The implementation method is described below, and the code of the main method is pasted first:

The above code is the main method to obtain pictures asynchronously. Softreference is a soft reference for better system recycling variables. Repeated URLs directly return existing resources and implement callback functions to update the data to the UI thread after success.

Several auxiliary class files:

Viewcache is the layout of the child elements that help get the adapter:

Imageandtextlistadapter is an adapter to implement listview. One trick is ImageView. Settag (imageurl). Settag stores data. This is to ensure that listview updates its corresponding item when calling back the function. You can read it carefully.

Finally, paste the layout file:

The screenshot of operation effect is as follows:

I hope this article is helpful to your c# program design.