[英]Content of ViewPager disappears when navigating back and forth using Navigation Components
將導航遷移到新的Jetpack導航組件后,我發現使用庫來回導航后,ViewPager中前兩個片段的內容/布局消失了。 單擊選項卡后,它又回來了。
起初我以為是因為我在logcat中看到了錯誤,但是修復它們之后,問題仍然存在。
這是我的MainActivity的代碼:
private Toolbar toolbar;
private NavigationView navigationView;
private DrawerLayout drawerLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bindResources();
// Setup Toolbar & Navigation Component
setSupportActionBar(toolbar);
setupNavigation();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu_options, menu);
return super.onCreateOptionsMenu(menu);
}
private void setupNavigation() {
NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
AppBarConfiguration appBarConfiguration = new AppBarConfiguration.Builder(navController.getGraph())
.setDrawerLayout(drawerLayout)
.build();
NavigationUI.setupWithNavController(toolbar, navController, appBarConfiguration);
NavigationUI.setupWithNavController(navigationView, navController);
}
這是我的ViewPagerAdapter的代碼:
private final List<Fragment> fragmentList = new ArrayList<>();
private final List<String> fragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(@NonNull FragmentManager fm) {
super(fm);
}
public void addFragment(@NonNull Fragment fragment, String title) {
fragmentList.add(fragment);
fragmentTitleList.add(title);
}
@NonNull
@Override
public Fragment getItem(int position) {
return fragmentList.get(position);
}
@Override
public int getCount() {
return fragmentList.size();
}
@Nullable
@Override
public CharSequence getPageTitle(int position) {
return fragmentTitleList.get(position);
}
這是我的HomeFragment:
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
bindResources(view);
// ViewPager
ViewPagerAdapter viewPagerAdapter = new ViewPagerAdapter(getActivity().getSupportFragmentManager());
viewPagerAdapter.addFragment(new TodayFragment(), getString(R.string.tab_today_title));
viewPagerAdapter.addFragment(new PriorityFragment(), getString(R.string.tab_priority_title));
viewPagerAdapter.addFragment(new PlannedFragment(), getString(R.string.tab_planned_title));
viewPagerAdapter.addFragment(new TasksFragment(), getString(R.string.tab_tasks_title));
viewPager.setAdapter(viewPagerAdapter);
// TabLayout
tabLayout.setupWithViewPager(viewPager);
}
Java:我通過替換解決了問題
= new ViewPagerAdapter(getActivity().getSupportFragmentManager());
同
= new ViewPagerAdapter(getChildFragmentManager());
Kotlin:通過替換
= ViewPagerAdapter(fragmentManager)
同
= ViewPagerAdapter(childFragmentManager)
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