How do I retrieve the data from AsyncTasks doInBackground()?

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The only way to do this is using a CallBack. You can do something like this:

new CallServiceTask(this).execute(request, url);

Then in your CallServiceTask add a local class variable and call a method from that class in your onPostExecute:

private class CallServiceTask extends AsyncTask<Object, Void, Object[]>
{
    RestClient caller;

    CallServiceTask(RestClient caller) {
        this.caller = caller;
    }


    protected Object[] doInBackground(Object... params) 
    {
        HttpUriRequest req = (HttpUriRequest) params[0];
        String url = (String) params[1];
        return executeRequest(req, url);
    }

    protected onPostExecute(Object result) {
        caller.onBackgroundTaskCompleted(result);
    }
}

Then simply use the Object as you like in the onBackgroundTaskCompleted() method in your RestClient class.

A more elegant and extendible solution would be to use interfaces. For an example implementation see this library. I’ve just started it but it has an example of what you want.

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