Best way to Handle FragmentTransaction in AsyncTask.onPostExecute after onDestroy is called

Question

In my application, I always need to execute some stuff at the first time the app is open. When user opens it, the app shows a dialog with a progressbar, while executes an AsyncTask on background, and after (on onPostExecute()) i need to commit a Fragment.

So, in my Main Activity's onCreate() method, I have:

public class InitialActivity extends SherlockFragmentActivity{

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_initial);
        if(savedInstanceState == null) //Executes just at the firstTime
        {
            //ApplicationStarter -> It manages all execution to start my app, executes asynctask, shows dialogs..
            ApplicationStarter starter = new ApplicationStarter(this) {

                @Override
                public void afterFinish() {
                    //It Executes at onPostExecute when doInBackground() finishes
                    ItensFragment itensfrag = new ItensFragment();
                    frag.setTargetFragment(itensfrag , 0);
                    android.support.v4.app.FragmentTransaction ft = getSupportFragmentManager()
                            .beginTransaction();
                    ft.replace(R.id.simple_fragment, itensfrag);
                    ft.commitAllowingStateLoss();   

                }
            };
            starter.start();
        }
    }
}

So, everything goes Ok, but the app crashes if user rotates the device or after onDestroy() method is called. The following exception is launched:

java.lang.IllegalStateException: Activity has been destroyed

at ft.commitAllowingStateLoss();

I searched around and I found on this post that it isn't a good practice to perform a Fragment transiction inside asynchronous callback methods like i am trying to do. And i saw this answer too, that maybe i could adapt to my case. But before that, i would like to know if anyone has a better way or suggestion for what i'm trying to do.
Thanks in advance.

happens bcoz when orientation changes your activity is destroyed and recreated. Asynctask as the name suggests is asynchronous — Raghunandan, Jan 11 '14 at 15:47
you could check this blog if it helps. http://www.androiddesignpatterns.com/2013/04/retaining-objects-across-config-changes.html — Raghunandan, Jan 11 '14 at 15:50

score 0 · Accepted Answer · answered Jan 12 '14 at 11:52

How @Raghunandan suggested, i followed this post and everything worked fine. The big difference is that now i call my ApplicationStarter on onCreate of my Fragment which is set to setRetainInstance(true). The InitialActivity has an instance of ItensFragment. The code in my InitialActivity's onCreate() is:

public class InitialActivity extends SherlockFragmentActivity {
private ItensFragment itensfrag;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_inicial);
    FragmentManager fm = getSupportFragmentManager();
    itensfrag= (ItensFragment) fm.findFragmentByTag("itensfrag");
    if (savedInstanceState == null) {
        if (itensfrag== null) {
            itensfrag= new ItensFragment();
          fm.beginTransaction().replace(R.id.simple_fragment, itensfrag, "itensfrag").commit();
        }
    }
}
}

Best way to Handle FragmentTransaction in AsyncTask.onPostExecute after onDestroy is called

1 Answers1