(We all know that Android UI is not thread safe. If you want to perform UI operations in sub threads, you need to rely on Android's asynchronous message management mechanism. I also wrote an article before that which analyzed the asynchronous message management mechanism of Android from the source code level. If you are interested, you can refer to the complete analysis of Android Handler and Message to guide you to fully understand it from the source code point of view. However, in order to make it easier for us to update UI elements in the sub thread, Android has introduced an AsyncTask class since version 1.5. With this class, we can switch from the sub thread to the UI thread in a very flexible and convenient way. It is also the protagonist of this article. AsyncTask has appeared in the Android API for a long time, so I believe most friends have fully understood its usage. But today I'm going to start with the basic usage of AsyncTask. Then let's analyze the source code of AsyncTask and see how it is implemented. Finally, I'll introduce some secrets about AsyncTask that you don't know.)
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