Save Fragment state across config changes

MainActivity.java

public class MainActivity extends AppCompatActivity {
    private Fragment savedFragment;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if (savedInstanceState != null) {
            savedFragment = getSupportFragmentManager().getFragment(savedInstanceState, "content");
        } else {
            savedFragment = new UserInfoFragment();
            getSupportFragmentManager()
                    .beginTransaction()
                    .replace(R.id.content_frame, savedFragment)
                    .commit();
        }
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        getSupportFragmentManager().putFragment(outState, "content", savedFragment);
    }
}