Implent An Asynctask Callback Function Returning Multiple Values?

I'm trying to understand how AsyncTask callbacks work. This is how my MainActivity looks so far: @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(save

Solution 1:

Your structure is not completely correct because you have 3 parameters in the Activity usage, but your AsyncTask should be "calling back" to the interface listener with some result.

For example

@Override
public void onPostExecute(Result result) {
    if (listener != null) {
        listener.onTaskCompleted(result);
    } 
}

So, you need to update the interface method to accept a parameter.

Then you need to pass in an implementation of that interface & method (or anonymous class) to the AsyncTask, then you have a callback.

Regarding the calling of multiple methods, you can use multiple callbacks for different tasks, but it really depends on your end goal.