Learn Android asynctask together

In Android development, in order to facilitate us to perform operations in the background thread, and then send the results to the main thread, so as to perform UI update and other operations in the main thread, anddroid development framework provides a helper class asynctask, which encapsulates thread and handler for our use.

Asynctask provides four callback methods, which are called at different times, as follows:

As shown in the figure below:

Define the subclass of asynctask and implement the callback function in the subclass. The source code is as follows:

Declare a subclass object and call the execute () method. The source code is as follows:

The call log is as follows:

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