片段在屏幕旋转时被调用两次

Question

我是Android新手，更改屏幕方向后会遇到此问题。 只要屏幕方向改变，该fragment就会被调用两次。 以下是我的代码示例。 我检查了其他帖子，但找不到答案。 有人指导我。

public class SampleFragment extends Fragment {

    static final String TAG_NAME = SampleFragment.class.getSimpleName();


    List<PhrToolBar> mToolBarList;


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        DaggerHelper.getAppProviderComponent().inject(this);

        mRootView = null;

        getActivity().setTitle("Personal Health Records");

        mRootView = inflater.inflate(R.layout.sample_phr_main_fragment, container, false);

        mBinding = DataBindingUtil.bind(mRootView);
        mBinding.setViewModel(mViewModel);

        setHasOptionsMenu(true);

        return mRootView;

    }

Answer 1

简单添加此代码

 if (savedInstanceState == null) {
// only create fragment if activity is started for the first time
  mFragmentManager = getSupportFragmentManager();
   FragmentTransaction fragmentTransaction =    mFragmentManager.beginTransaction();

 FragmentOne fragment = new FragmentOne();

fragmentTransaction.add(R.id.fragment_container, fragment);
fragmentTransaction.commit();
 } else {        
// do nothing - fragment is recreated automatically
}