Question

Here is what I am trying to do :
When my application starts, it directly starts an asynchronous call to get some data from a WebService.
Then, I open a second Activity that displays that data.
Simplified code :
Activity 1 :

OnPostExecute()
{               
for (int i = 0; i < jsonArray.length(); ++i)
    { JSONObject jsonTrack = jsonTrackArray.getJSONObject(i);
                JSONObject jsonObject = jsonArray.getJSONObject(i);
                Content content = new Content(jsonObject.getString("content"),
                MyApp.contentList.add(Content);
         }
}

Second Activity :

doSomething (contentList.get(0));

How can I make sure that when I try to access to contentList(0) that it has already been fetched by the AsynTask ?

Answer 1

You’ll probably want to either leave in user in the first activity until the operation is complete or move this logic to a service and broadcast upon completion and set some flag the second activity can check on its lifecycle creation methods.

scenario 1:
activity1 starts service then launches activity2.
Service completes, saves a preference, and broadcasts a success message.
activity2 receives this and does its thing.

scenario 2:
User comes back later to activity2, it's onResume checks a preference flag and knows the data exists, so it does its thing.