回收器视图在片段之间切换之前不会显示项目

Question

我正在设计一个应用程序，该应用使用底部划分在家庭反应性上有4个不同的片段，以在它们之间和我用作新闻feed的第一页上切换，直到直到我切换到不同的片段，然后再次返回。我了解与此类似的问题，但是在我的情况下似乎没有解决方案有帮助。我认为问题与片段中的ongreate（）和oncreateview的差异有关。

任何帮助都将不胜感激。

public class HomeFragment extends Fragment {
View v;
private RecyclerView recyclerView;
private List<Drink> drinksList;
RecyclerViewAdapter recyclerViewAdapter;
public HomeFragment() {
    // Required empty public constructor
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    v =  inflater.inflate(R.layout.fragment_home, container, false);

    return v;
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    drinksList = new ArrayList<>();
    drinksList.add(new Drink("Latte",999,"Coffee","test",1.99,77,R.drawable.latte));
    drinksList.add(new Drink("Black Tea",123,"Tea", "test", 1.50,11,R.drawable.blacktea));
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    recyclerView = v.findViewById(R.id.recyclerView);
    recyclerViewAdapter = new RecyclerViewAdapter(drinksList,getContext());
    recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
    recyclerView.setAdapter(recyclerViewAdapter);
    recyclerViewAdapter.notifyDataSetChanged();
}

}

编辑添加寄宿家庭

public void setupmenunav（）{

    mMainFrame = findViewById(R.id.mainFrame);
    bottomNavigationView = findViewById(R.id.bottomNaviationView);
    homeFragment = new HomeFragment();
    socialFragment = new SocialFragment();
    trackingFragment = new TrackingFragment();
    locationFragment = new LocationFragment();
    bottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
        @Override
        public boolean onNavigationItemSelected(@NonNull MenuItem item) {
            switch (item.getItemId()) {
                case R.id.navHome:
                    setFragment(homeFragment);
                    return true;
                case R.id.navSocial:
                    setFragment(socialFragment);
                    return true;
                case R.id.navTracking:
                    setFragment(trackingFragment);
                    return true;
                case R.id.navLocation:
                    setFragment(locationFragment);
                    return true;
                default:
                    return false;
            }
        }
    });
}

    private void setFragment(Fragment fragment) {
    FragmentTransaction fragmentTransaction =  getSupportFragmentManager().beginTransaction();
    fragmentTransaction.replace(R.id.mainFrame, fragment);
    fragmentTransaction.commit();
}

然后在onCreate（）方法

Answer 1

onCreate()上的 HomeActivity添加 setFragment(new HomeFragment())上的方法。那应该可以解决问题。