Android：如何处理多项任务

Question

I want to perform multiple tasks in Android. I know I can use AsyncTask for this. But my requirement is I want to execute second task only completion of first task. Then will execute the third task only after completion of second task. How it could be possible. For this I am thinking to use multiple AsyncTasks i mean inside doInBackground of first AsynTask I want to start second AsyncTask. Similarly inside doInBackground of secondAsynTask I want to start third AsyncTask and so on.... Is it ok if I implement like this with out any performance issue or is there any other way of doing this. Please share your thoughts on this.

Answer 1

Create multiple AsyncTasks and call them in a chain.

Eg:

Call the first task:

new FirstTask().execute();

Then FirstTask class overrides onPostExecute where it calls the second class:

new SecondTask().execute()

and so on.

Answer 2

If you don't want to reinvent the wheel you could use concat () operator of rxjava.

https://github.com/ReactiveX/RxJava/wiki/Mathematical-and-Aggregate-Operators#concat