Android Expresso - wait for async task to finish

Question

I have a number of screens with a spinner on the actionbar. When the user changes the spinner option, the list below refreshes with the appropriate data. The activity spawns an async task whenever the user changes the spinner option. But my expresso test seems to fail whenever the option is clicked as the test is looking for a specific post in the list. If I add a sleep, it works fine and finds the post. How do I make the expresso test wait for that async task ?

Answer 1

Use the get method for an AsyncTask which (from the docs):

Waits if necessary for the computation to complete, and then retrieves its result.

Should be something like:

try {
  MyAsyncTask myTask = new MyAsyncTask();
  myTask.execute(myParamObject);
  MyResultObject result = myTask.get();
} catch (CancellationException e) {
    Log.e("TAG", e.getMessage(), e);
} catch (InterruptedException e) {
    Log.e("TAG", e.getMessage(), e);
} catch (ExecutionException e) {
    Log.e("TAG", e.getMessage(), e);
}