我正在使用viewpager和tabs，我添加了4个片段，每个片段都有一个recyclerveiw，我想让它更新，而用户正在创建新项目以存储在recycler视图中我的问题是oncreateview()我只调用一次，当我在这些视图之间滑动时，onresume()也没有被调用，所以我应该覆盖哪种方法，每次滑动都会调用，以便能够更新ui？我已经坐了2天了，如果有人可以帮助我，我找不到答案是我的代码。
public class SectionsPagerAdapter extends FragmentStatePagerAdapter {
private final List<Fragment> mFragments = new ArrayList<>();
private final List<String> mFragmentTitles = new ArrayList<>();
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
public void addFragment(Fragment fragment, String title) {
mFragments.add(fragment);
mFragmentTitles.add(title);
}
@Override
public Fragment getItem(int position) {
return mFragments.get(position);
}
@Override
public int getCount() {
tabCount = mFragments.size();
return mFragments.size();
}
@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitles.get(position);
}
}
private void setupViewPager(ViewPager viewPager) {
SectionsPagerAdapter adapter = new SectionsPagerAdapter(getSupportFragmentManager());
Bundle args = new Bundle();
PlaceholderFragment todayLayout = new PlaceholderFragment();
args.putInt(PlaceholderFragment.ARG_LAYOUT_TYPE, PlaceholderFragment.LAYOUT_TYPE_TODAY);
todayLayout.setArguments(args);
Bundle args1 = new Bundle();
PlaceholderFragment archiveLayout = new PlaceholderFragment();
args1.putInt(PlaceholderFragment.ARG_LAYOUT_TYPE, PlaceholderFragment.LAYOUT_TYPE_ARCHIVE);
archiveLayout.setArguments(args1);
Bundle args2 = new Bundle();
PlaceholderFragment helpLayout = new PlaceholderFragment();
args2.putInt(PlaceholderFragment.ARG_LAYOUT_TYPE, PlaceholderFragment.LAYOUT_TYPE_HELP);
helpLayout.setArguments(args2);
Bundle args3 = new Bundle();
PlaceholderFragment notDoneLayout = new PlaceholderFragment();
args3.putInt(PlaceholderFragment.ARG_LAYOUT_TYPE, PlaceholderFragment.LAYOUT_TYPE_NOT_DONE);
notDoneLayout.setArguments(args3);
adapter.addFragment(todayLayout, "Do Today");
adapter.addFragment(archiveLayout, "Archive");
adapter.addFragment(helpLayout, "Help");
adapter.addFragment(notDoneLayout, "Not Done");
viewPager.setAdapter(adapter);
}
public class PlaceholderFragment extends Fragment {
public static final int LAYOUT_TYPE_TODAY = 1;
public static final int LAYOUT_TYPE_ARCHIVE = 2;
public static final int LAYOUT_TYPE_HELP = 3;
public static final int LAYOUT_TYPE_NOT_DONE = 4;
public static final String ARG_LAYOUT_TYPE = "layout_arg_type";
private int thisLayoutType = 0;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.recycler_for_layouts, container, false);
recyclerView =(RecyclerView) view.findViewById(R.id.recycler_view);
setUpAdepter();
thisLayoutType = getArguments().getInt(ARG_LAYOUT_TYPE, 0);
setUpRecycler(recyclerView);
return view;
}
@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
super.setUserVisibleHint(isVisibleToUser);
// Make sure that we are currently visible
if (this.isVisible()) {
helpAdepter.addItems(saveHelp);
if (!isVisibleToUser) {
}
}
}
private void setUpAdepter() {
todayAdepter= new ViewListAdepters(getContext(),new ViewListAdepters.ItemClickListener() {
@Override
public void onItemClicked(TodoDaily daily, int icon) {
switch (icon){
case 0:
break;
case 1:
setPopUpForEdit(daily);
//here i want to update the ui
break;
case 2:
setPopUpForDone(daily);
break;
case 3:
setPopUpForHelp();
break;
case 4:
setPopUpForNotDone();
break;
case 5:
setPopUpForShift();
break;
default:
break;
}
}
});
archiveAdepter= new ArchiveAdepter(getContext(),new ArchiveAdepter.ItemClickListener() {
@Override
public void onItemClicked(TodoDaily daily, int icon) {
switch (icon){
case 0:
break;
case 1:
setPopUpForEdit(daily);
break;
case 2:
setPopUpForDone(daily);
break;
case 3:
setPopUpForHelp();
break;
case 4:
setPopUpForNotDone();
break;
case 5:
setPopUpForShift();
break;
default:
break;
}
}
});
helpAdepter= new HelpAdepter(getContext(),new HelpAdepter.ItemClickListener() {
@Override
public void onItemClicked(TodoDaily daily, int icon) {
switch (icon){
case 0:
break;
case 1:
setPopUpForDone(daily);
break;
case 2:
setPopUpForNotDone();
break;
case 3:
setPopUpForShift();
break;
default:
break;
}
}
});
notDoneAdepter= new NotDoneAdepter(getContext(),new NotDoneAdepter.ItemClickListener() {
@Override
public void onItemClicked(TodoDaily daily, int icon) {
switch (icon){
case 0:
break;
case 1:
setPopUpForDone(daily);
break;
case 2:
setPopUpForHelp();
break;
case 3:
setPopUpForShift();
break;
default:
break;
}
}
});
todayAdepter= new ViewListAdepters(getContext(),new ViewListAdepters.ItemClickListener() {
@Override
public void onItemClicked(TodoDaily daily, int icon) {
switch (icon){
case 0:
break;
case 1:
setPopUpForEdit(daily);
break;
case 2:
setPopUpForDone(daily);
break;
case 3:
setPopUpForHelp();
break;
case 4:
setPopUpForNotDone();
break;
case 5:
setPopUpForShift();
break;
default:
break;
}
}
});
}
private void setUpRecycler(RecyclerView recyclerView) {
switch (thisLayoutType){
case (LAYOUT_TYPE_TODAY):
recyclerView.setAdapter(todayAdepter);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
break;
case (LAYOUT_TYPE_ARCHIVE):
recyclerView.setAdapter(archiveAdepter);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
break;
case (LAYOUT_TYPE_HELP):
recyclerView.setAdapter(helpAdepter);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
break;
case (LAYOUT_TYPE_NOT_DONE):
recyclerView.setAdapter(notDoneAdepter);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
break;
}
}
private void showEmptyView(boolean isEmpty) {
if(isEmpty){
emptyText.setVisibility(View.VISIBLE);
recyclerView.setVisibility(View.GONE);
}else {
emptyText.setVisibility(View.GONE);
recyclerView.setVisibility(View.VISIBLE);
}
}
}
答案 0 :(得分：2)
我创建了一个简单的项目，演示了如何在ViewPager中更新RecycleView
您可以找到View Pager update with RecycleView
您可以在日志项目中看到FragmentStatePagerAdapter中的Lifecyrcle片段。
您可以使用ViewPager.OnPageChangeListener来了解现在选择的页面。
我希望这有帮助。