我注意到它必须显示一次的TabLayout唯一负载，因此当我替换包含并切换回它时，它不会重新创建它所持有的内容，因此它们不再显示任何内容。这是这样的设计还是我做错了什么？我在 a 中使用外部，当用户切换到另一个并返回时，选项卡是空的，因为它们没有被重新创建。我还注意到，在我切换回包含它们的片段后，选项卡的行为非常奇怪（它们下方的白线跳转，您可以将其保持在两个选项卡之间而无需触摸屏幕）FragmentsFragmentTabLayoutFragmentsFragmentNavigationDrawerFragmentFragments
我正在使用的代码：
public class Fragment1 extends Fragment {
private static ViewPager viewPager;
private static TabLayout tabLayout;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
Utils.changeLanguage(getActivity());
final Context contextThemeWrapper = new ContextThemeWrapper(getActivity(), R.style.LinesOverlay);
LayoutInflater localInflater = inflater.cloneInContext(contextThemeWrapper);
View view = localInflater.inflate(R.layout.fragment1, container, false);
viewPager = (ViewPager) view.findViewById(R.id.viewpager);
tabLayout = (TabLayout) view.findViewById(R.id.tabs);
return view;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
setupViewPager(viewPager);
tabLayout.setupWithViewPager(viewPager);
}
private void setupViewPager(ViewPager viewPager) {
LinesTabsAdapter adapter = new LinesTabsAdapter(getActivity().getSupportFragmentManager());
adapter.addFragment(new Fragment2(), "Fragment 1");
adapter.addFragment(new Fragment3(), "Fragment 2");
viewPager.setAdapter(adapter);
}
public static class Fragment2 extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.activity_lines_driving, container, false);
return view;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
}
public static class Fragment3 extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.activity_lines_all, container, false);
return view;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
}
LinesTabsAdapter：
public class LinesTabsAdapter extends FragmentPagerAdapter {
private final List<Fragment> fragments = new ArrayList<>();
private final List<String> fragmentTiles = new ArrayList<>();
public LinesTabsAdapter(FragmentManager fm) {
super(fm);
}
public void addFragment(Fragment fragment, String title) {
fragments.add(fragment);
fragmentTiles.add(title);
}
@Override
public Fragment getItem(int position) {
return fragments.get(position);
}
@Override
public int getCount() {
return fragments.size();
}
@Override
public CharSequence getPageTitle(int position) {
return fragmentTiles.get(position);
}
}