片段在屏幕旋转上被调用两次

Question

我是android新手，当屏幕方向改变时我面临这个问题。当屏幕方向改变时，fragment会被调用两次。以下是我的代码示例。我查了其他帖子，但无法找到答案。任何人都可以通过此指导我

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

简单添加以下代码

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 
}