IllegalStateException: Fragment <ThisFragment> is not currently in the FragmentManager

Question

I have trouble of tracing the cause of the crash in my app. I have a fragment that displays a ListView, I also have SlidingMenu for a search field. And when I search, the ListView items are repopulated basing from the search results. Now, my app crashes when I try to open a ListView item from the new populated result.

The exception is triggered here:

@Override
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    getSupportFragmentManager().putFragment(outState, "mContent", mContent); //Exception made here
}

Is this because of the support library? How do I resolve this?

EDIT:

Here's the stack trace:

02-05 12:51:53.941: E/AndroidRuntime(11638): FATAL EXCEPTION: main
02-05 12:51:53.941: E/AndroidRuntime(11638): java.lang.IllegalStateException: Fragment MyFragment{436749b0} is not currently in the FragmentManager
02-05 12:51:53.941: E/AndroidRuntime(11638):    at android.support.v4.app.FragmentManagerImpl.putFragment(FragmentManager.java:546)
02-05 12:51:53.941: E/AndroidRuntime(11638):    at com.sample.android.app.SearchListActivity.onSaveInstanceState(SearchListActivity.java:118)
02-05 12:51:53.941: E/AndroidRuntime(11638):    at android.app.Activity.performSaveInstanceState(Activity.java:1137)
02-05 12:51:53.941: E/AndroidRuntime(11638):    at android.app.Instrumentation.callActivityOnSaveInstanceState(Instrumentation.java:1215)
02-05 12:51:53.941: E/AndroidRuntime(11638):    at android.app.ActivityThread.performStopActivityInner(ActivityThread.java:2972)
02-05 12:51:53.941: E/AndroidRuntime(11638):    at android.app.ActivityThread.handleStopActivity(ActivityThread.java:3031)
02-05 12:51:53.941: E/AndroidRuntime(11638):    at android.app.ActivityThread.access$900(ActivityThread.java:138)
02-05 12:51:53.941: E/AndroidRuntime(11638):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
02-05 12:51:53.941: E/AndroidRuntime(11638):    at android.os.Handler.dispatchMessage(Handler.java:99)
02-05 12:51:53.941: E/AndroidRuntime(11638):    at android.os.Looper.loop(Looper.java:213)
02-05 12:51:53.941: E/AndroidRuntime(11638):    at android.app.ActivityThread.main(ActivityThread.java:4787)
02-05 12:51:53.941: E/AndroidRuntime(11638):    at java.lang.reflect.Method.invokeNative(Native Method)
02-05 12:51:53.941: E/AndroidRuntime(11638):    at java.lang.reflect.Method.invoke(Method.java:511)
02-05 12:51:53.941: E/AndroidRuntime(11638):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
02-05 12:51:53.941: E/AndroidRuntime(11638):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
02-05 12:51:53.941: E/AndroidRuntime(11638):    at dalvik.system.NativeStart.main(Native Method)

EDIT 2: Here's my Activity:

private Fragment mFragment;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

            ..........

    params = new Bundle();
    params.putInt("id", id);

    // set the Above View Fragment
    if (savedInstanceState != null)
        mFragment = getSupportFragmentManager().getFragment(
                savedInstanceState, "mFragment");
    else {
        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager
                .beginTransaction();
        SampleListFragment fragment = new SampleListFragment();
        fragment.setArguments(params);
        fragmentTransaction.add(R.id.list_fragment, fragment);
        fragmentTransaction.commit();
    }

    if (mFragment == null) {
        mFragment = new SampleListFragment();
        mFragment.setArguments(params);
    }
    getSupportFragmentManager().beginTransaction()
            .replace(R.id.list_fragment, mFragment).commit();

    // set the Behind View Fragment
    Fragment searchFragment = new SampleSearchFragment();
    searchFragment.setArguments(params);

    getSupportFragmentManager().beginTransaction()
            .replace(R.id.activity_search, searchFragment)
            .commit();
}


@Override
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    getSupportFragmentManager().putFragment(outState, "mFragment",
            mFragment);
}

And in my SampleListFragment, I have this method:

public static boolean isNetworkAvailable(Activity activity) {
    ConnectivityManager connectivity = (ConnectivityManager) activity
            .getSystemService(Context.CONNECTIVITY_SERVICE);
    if (connectivity == null) {
        return false;
    } else {
        NetworkInfo[] info = connectivity.getAllNetworkInfo();
        if (info != null) {
            for (int i = 0; i < info.length; i++) {
                if (info[i].getState() == NetworkInfo.State.CONNECTED) {
                    return true;
                }
            }
        }
    }
    return false;
}

Inside of Asynctask:

..........
@Override
protected void onPostExecute(String result) {
    super.onPostExecute(null);

    if (null != pDialog && pDialog.isShowing()) {
        pDialog.dismiss();
    }

    if (isNetworkAvailable(getActivity())) { //Triggered NPE

From here, how do I know if getActivity() is now attached to the parent activity before calling it?

Answer 1

Before saving the fragment in onSaveInstanceState make sure to check if fragment is added to fragment manager

@Override 
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    if (mFragment.isAdded()){
        getSupportFragmentManager().putFragment(outState, "mFragment", mFragment); 
    }
}