Waiting for asynchronous callback in Android's IntentService

Question

I have an IntentService that starts an asynchronous task in another class and should then be waiting for the result.

The problem is that the IntentSer

Answer 1

My favorite option is to expose two similar methods, for example:

public List getDogsSync();
public void getDogsAsync(DogCallback dogCallback);

Then the implementation could be as follows:

public List getDogsSync() {
    return database.getDogs();
}

public void getDogsAsync(DogCallback dogCallback) {
    new AsyncTask>() {
        @Override
        protected List doInBackground(Void... params) {
            return getDogsSync();
        }

        @Override
        protected void onPostExecute(List dogs) {
            dogCallback.success(dogs);
        }
    }.execute();
}

Then in your IntentService you can call getDogsSync() because it's already on a background thread.