Question

我在片段中使用Viewpager，并且viewpager在其片段中有一个listview。因此，当单击列表项时，它将被重定向到同一活动中的另一个片段。所以当我回到我之前的片段（viewpager）时，viewpager是空白的！为什么会如此我迫切需要解决方案。任何建议都将不胜感激。

//tabs inside the fragment
public class TabsPagerAdapter extends FragmentStatePagerAdapter {
public TabsPagerAdapter(FragmentManager fm) {
super(fm);
}

/* @Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
return PageFragment.newInstance(position + 1);
}

@Override
public int getCount() {
return 3;
}

@Override
public CharSequence getPageTitle(int position) {
return "TAB " + (position + 1);
}*/
@Override
public Fragment getItem(int position) {

Fragment frag = null;
switch (position) {
case 0:
frag = new Full_Roaster_Fragment();
break;
case 1:
frag = new By_Sport_Fragment();
break;
case 2:
frag = new By_Team_Fragment();
break;
case 3:
frag = new Video_Critique_Fragment();
break;
}
return frag;
}

@Override
public int getCount() {
return 4;
}

@Override
public CharSequence getPageTitle(int position) {
String title=" ";
switch (position){
case 0:
title="Full Roaster";
break;
case 1:
title="By Sport";
break;
case 2:
title="By Team";
break;
case 3:
title="For Video Critique";
break;
}

return title;
}
}

// Viewpager的子片段

public class Full_Roaster_Fragment extends Fragment implements AdapterView.OnItemClickListener {

private View rootView;
public static ListView Analystslist;
public static FullRoasterAdapter full_Roaster_adapter;
public static ArrayList<ics.com.ics_app.Beans.AnalystSearchBean.Teams> analysts_search_arraylist1 = new ArrayList<>();

@Override
public View onCreateView(LayoutInflater inflater,

ViewGroup container, Bundle savedInstanceState) {

rootView = inflater.inflate(R.layout.fragment_full_roaster, container, false);
initialization();

full_Roaster_adapter = new FullRoasterAdapter(getActivity(), ApplicationGlobalClass.analysts_search_arraylist);
full_Roaster_adapter.notifyDataSetChanged();
Analystslist.setAdapter(full_Roaster_adapter);
return rootView;
}

@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
full_Roaster_adapter = new FullRoasterAdapter(getActivity(), ApplicationGlobalClass.analysts_search_arraylist);
full_Roaster_adapter.notifyDataSetChanged();
Analystslist.setAdapter(full_Roaster_adapter);
}

@Override
public void onActivityCreated(Bundle savedInstanceState)
{
super.onActivityCreated(savedInstanceState);
Toast.makeText(getActivity(), "Full Roaster on Activity Created", Toast.LENGTH_SHORT).show();

// Populates list with our static array
full_Roaster_adapter = new FullRoasterAdapter(getActivity(), ApplicationGlobalClass.analysts_search_arraylist);
full_Roaster_adapter.notifyDataSetChanged();
Analystslist.setAdapter(full_Roaster_adapter);
Log.e("sizeee",String.valueOf(ApplicationGlobalClass.analysts_search_arraylist.size()));
}

private void initialization() {

Analystslist = (ListView)rootView.findViewById(R.id.Analysts_listview);


Analystslist.setOnItemClickListener(this);
}

@Override
public void onResume() {
super.onResume();
// if (ApplicationGlobalClass.flag) {

Toast.makeText(getActivity(), "full Roaster on Resume", Toast.LENGTH_SHORT).show();
full_Roaster_adapter = new
..
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {

ApplicationGlobalClass.user_id=ApplicationGlobalClass.analysts_search_arraylist.get(i).get(i).getId();
Log.e("userid",String.valueOf(ApplicationGlobalClass.user_id));
Log.e("userid2",String.valueOf(ApplicationGlobalClass.analysts_search_arraylist.get(i).get(i).getId()));
//here new fragment is calling from this fragment
getActivity().getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,new FlexibleSpaceWithImageWithViewPagerTab2Activity()).addToBackStack("profile1").commit();

}

Answer 1

您需要覆盖托管片段的活动中的onBackPressed()，如下所示：

  public void onBackPressed() {
          int = count = getFragmentManager().getBackStackEntryCount();

        if (count == 0) {
            super.onBackPressed();
            //additional code
        } else {
            getFragmentManager().popBackStack();
        }

当单击其中的listiview项目并将其重定向到另一个片段时，片段内的Viewpager为空白

1 个答案: