Maintaining savedInstanceState in a fragment. Source: http://stackoverflow.com/a/13306633

MainActivity.java

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Only set fragment when saved instance is null
        if(savedInstanceState==null) {
            FragmentManager fragmentManager = getSupportFragmentManager();
            FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
            fragmentTransaction.replace(R.id.frame_layout_main,
                MainActivityFragment.newInstance(),
                MainActivityFragment.class.getSimpleName());
            fragmentTransaction.commit();
        }
    }
}

MainActivityFragment.java

public class MainActivityFragment extends Fragment {
    private static final String ARG_TEXT="TEXT";
    
    private TextView mTxtView;

    public static MainActivityFragment newInstance() {
        MainActivityFragment fragment = new MainActivityFragment();
        return fragment;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(inflater, R.layout.fragment_main, container, false);
        bindViews(view);
        return view;
    }
    
    private void bindViews(View view){
        mTxtView=(TextView)view.findViewById(R.id.text_view);
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        // Check if the text is already available in the savedInstanceState bundle, if available
        // set it on the textView.
        if(savedInstanceState!=null){
            String text=savedInstanceState.getString(ARG_TEXT);
            mTxtView.setText(text);
        }else {
            mTxtView.setText("No data available");
        }
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putString(ARG_TEXT, "hello fragment !");
    }
}