How to properly retain state of fragments in back stack without using setRetainInstance(true).

StatefulFragment.txt

/**
 * @author Igor Oliveira
 */
public abstract class StatefulFragment extends Fragment {

	private Bundle savedState;
	private boolean saved;
	private static final String _FRAGMENT_STATE = "FRAGMENT_STATE";

	@Override
	public void onSaveInstanceState(Bundle state) {
		if (getView() == null) {
			state.putBundle(_FRAGMENT_STATE, savedState);
		} else {
			Bundle bundle = saved ? savedState : getStateToSave();

			state.putBundle(_FRAGMENT_STATE, bundle);
		}

		saved = false;

		super.onSaveInstanceState(state);
	}

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

		if (state != null) {
			savedState = state.getBundle(_FRAGMENT_STATE);
		}
	}

	@Override
	public void onDestroyView() {
		savedState = getStateToSave();
		saved = true;

		super.onDestroyView();
	}

	protected Bundle getSavedState() {
		return savedState;
	}

	protected abstract boolean hasSavedState();

	protected abstract Bundle getStateToSave();

}

1. Extend this class;

2. In your Fragment, you must have this:

	@Override
	protected boolean hasSavedState() {
		Bundle sate = getSavedState();

		if (sate == null) {
			return false;
		}
  
	  	//restore your data here

		return true;
	}
	
3. For example, you can call hasSavedState in onActivityCreated:

	@Override
	public void onActivityCreated(Bundle state) {
		super.onActivityCreated(state);

		if (hasSavedState()) {
			return;
		}

		//your code here
	}