[英]TabLayout shows a blank fragment, the second time
在我的Android應用程序中,我使用帶有FragmentStatePagerAdapter
的TabLayout
來顯示動態生成的片段。 第一次可以正確顯示片段,但是當返回到已經查看但不是相鄰的片段時,它將顯示空白頁面。
我研究了這個問題,似乎有兩種方法可以解決此問題:
使用FragmentStatePagerAdapter
而不是FragmentPagerAdapter
,我已經做到了,並且沒有任何改變。
更改
adapter = new FragmentStatePagerAdapter(*getSupportFragmentManager*());
成:
adapter = new FragmentStatePagerAdapter(*getChildFragmentManager*());
因為我在AppCompatActivity
並且此方法在Fragment中所以無法執行...
有沒有一種方法可以解決此問題,而無需將此活動擴展到FragmentActivity
,而這會使我項目中的其他內容搞砸了?
碼:
private class SubsPagerAdapter extends FragmentStatePagerAdapter {
private final ArrayList<Fragment> fragmentsList = new ArrayList<>();
private final ArrayList<String> titleList = new ArrayList<>();
SubsPagerAdapter(FragmentManager manager) {
super(manager);
}
@Override
public Fragment getItem(int position) {
return fragmentsList.get(position);
}
@Override
public int getCount() {
return fragmentsList.size();
}
void addFragment(Fragment fragment, String title) {
fragmentsList.add(fragment);
titleList.add(title);
}
@Override
public CharSequence getPageTitle(int position) {
return titleList.get(position);
}
@Override
public Parcelable saveState() {
return null;
}
}
執行:
subsPager = (ViewPager) findViewById(R.id.subsPager);
tabLayout = (TabLayout) findViewById(R.id.tabs_view);
subsPager.setAdapter(adapter);
tabLayout.setupWithViewPager(subsPager)
編輯-片段代碼:
public class PostsListFragment extends Fragment {
private ArrayList<CustomPost> posts;
private Sorting sorting;
private String name;
private RecyclerView recyclerView;
private SubPostsAdapter adapter;
private LinearLayoutManager linearLayoutManager;
private Fetcher fetcher
public PostsListFragment() {
this.posts = new ArrayList<>();
}
public static Fragment newInstance(String name) {
PostsListFragment pf = new PostsListFragment();
pf.name = name;
return pf;
}
@Override
public View onCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
recyclerView = (RecyclerView) inflater.inflate(R.layout.posts_list_holder, container, false);
//default sorting
this.sorting = Sorting.HOT;
this.fetcher = new Fetcher(name);
loadItems();
return recyclerView;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
setHasOptionsMenu(true);
}
private void loadItems() {
if (posts.size() == 0) {
new Thread() {
@Override
public void run() {
posts.addAll(fetcher.fetchPosts(sorting));
new Thread() {
@Override
public void run() {
linearLayoutManager = new LinearLayoutManager(recyclerView.getContext());
adapter = new SubPostsAdapter(posts, getActivity());
getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
recyclerView.setLayoutManager(linearLayoutManager);
recyclerView.setAdapter(adapter);
}
});
}
}.start();
}
}.start();
}
}
}
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