我的onResume依赖于`onViewCreated`。 我该如何重新设计呢？

Question

I have a fragment and onViewCreated an AsyncTask is started that loads some data in the background and in onPostExecute it loads the data to an ArrayAdapter to be displayed to a list in the UI.
Now onResume I need to load some other data that needs to be loaded in a background thread. So I can use start an AsyncTask for that.
This second background task loads some other data from another data source.

Problem: Once these data are loaded and before finishing process I need to do access the data loaded in the ArrayAdapter from the AsyncTask of onViewCreated .
Taking into account that:
1) I should not access the ArrayAdapter from a non-UI thread and
2) I can't be sure that the AsyncTask of onViewCreated has already been finished (I recently was informed that AsyncTasks are actually run one after the other)
How can I fix my design so that this works?
Please note that the data loaded onViewCreated are much much more than the data loaded onResume so preferably I would not want to reload them on each resume

Answer 1

You can check the status of your AsyncTask with a call to .getStatus() and see if it's ie finished ( AsyncTask.Status.FINISHED ). As for accessing the adapter from inside the asyncTask, you need to use onProgressUpdate , which is triggered on every update of the task, or in case you don't update the progress, it can be wrapped inside a Runnable like so:

//Inside doInBackground
runOnUiThread(new Runnable() {
    public void run() {
        //Your logic
    }
});

The difference is that if your code is something like downloading an image, or a file, that will be run inside a loop, reading n bytes everytime. You can call publishProgress(Progress...) to trigger the onProgressUpdate method and show feedback to the user, as in 50% downloaded.