Android implements image asynchronous loading and local caching

It is very common to access network pictures in Android projects. If we have to access the network to obtain pictures every time we request, it will consume a lot of traffic, and pictures occupy a large memory space. If there are too many pictures and they are not released, it is easy to cause memory overflow. For the above two problems, first of all, it consumes traffic. We can load the pictures locally for the first time, and then directly load them locally if there is one. Memory overflow caused by too many pictures is the most difficult to solve. To think of some good caching strategies, such as LRU caching strategy or lazy loading caching strategy for large pictures, first introduce the local cached pictures.

First, take a look at the asynchronous load cache native code:

This is an encapsulated asynchronous loading picture class. Two copies are cached. One is cached in memory by using soft reference, and the other is cached in the local SD card. If there is no picture in memory, it will be searched locally. If there is no picture in the local memory, it will be obtained from the network.

This is an access network access class. I won't elaborate. Here's how to use the encapsulated class to load pictures asynchronously:

This is done. If the network cannot get the bitmap, the default picture will be displayed.

This is a very practical method. Let's try it ourselves!

I hope this article will help you learn Android Software Programming.