I have a Tabbed Activity hosting a viewpager (auto-generated with eclipse wizard). I slightly modified just the auto generated FragmentPagerAdapter in order to instantiate a specific fragment on each tab. Initially i had 4 tab, 3 fragments for the first tabs and still the auto generated placeholder in the last one, and they worked. When i replaced the last placeholder with an instance of one of my Fragment i faced the following problem: the fragment in one of the last two tabs stays blank, as follow:
_____1st TAB___|____2nd TAB_|___3rd TAB_____|____4th TAB____|
[MasterFragment][RequestMap][MasterFragment][MasterFragment]
This stays blank_____________________|
Moreover, if i make a "random" sequence of actions (change tabs, click on the buttons to perform some actions,...) the fragment that doesn't show up swaps, and becomes the last one as follow:
_____1st TAB___|____2nd TAB_|___3rd TAB_____|____4th TAB____|
[MasterFragment][RequestMap][MasterFragment][MasterFragment]
This stays blank__________________________________|
Here's the code for my FragmentPagerAdapter:
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
switch (position) {
case REQUEST_TAB:
masterFragment = new MasterFragment(MasterFragment.ALL_REQUEST);
return masterFragment;
case MAP_TAB:
requestMap = new RequestMap();
return requestMap;
case OWNER_TAB:
masterFragmentOwner = new MasterFragment(MasterFragment.OWNER_REQUEST);
System.out.println("I should have created the Owner MasterFragment");
return masterFragmentOwner;
case JOINED_TAB:
masterFragmentJoined = new MasterFragment(MasterFragment.JOINED_REQUEST);
return masterFragmentJoined;
}
return null;
}
@Override
public int getCount() {
return 4;
}
@Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case REQUEST_TAB:
return getString(R.string.request_tab_title).toUpperCase(l);
case MAP_TAB:
return getString(R.string.map_tab_title).toUpperCase(l);
case OWNER_TAB:
return getString(R.string.owner_tab_title).toUpperCase(l);
case JOINED_TAB:
return getString(R.string.joined_tab_title).toUpperCase(l);
default:
return "";
}
}
}
I omit the code regarding the setup of the viewPager because is the same auto generated from the eclipse wizard. While here's the code for the MasterFragment class:
package it.polimi.frontend.fragment;
import it.polimi.appengine.entity.manager.model.Request;
import it.polimi.appengine.entity.manager.model.User;
import it.polimi.frontend.activity.R;
import it.polimi.frontend.util.QueryManager;
import it.polimi.frontend.util.QueryManager.OnRequestLoadedListener;
import java.util.ArrayList;
import java.util.List;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.view.InflateException;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class MasterFragment extends Fragment implements OnRequestLoadedListener, RequestList.OnRequestSelectedListener, RequestDetail.OnUserClickedListener{
private boolean twoPane;
private static View view;
public final static int ALL_REQUEST=0;
public final static int OWNER_REQUEST=1;
public final static int JOINED_REQUEST=2;
private int mode;
public MasterFragment(){
this.mode=0;
}
public MasterFragment(int mode){
this.mode=mode;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
QueryManager.getInstance().addListener(this);
if (view != null) {
ViewGroup parent = (ViewGroup) view.getParent();
if (parent != null)
parent.removeView(view);
}
try {
view = inflater.inflate(R.layout.fragment_master,container, false);
List<Request> requests = new ArrayList<Request>();
RequestList requestListFragment = null;
switch (mode) {
case OWNER_REQUEST:
requests = QueryManager.getInstance().getCurrentUser().getRequests();
System.out.println("Dovrei aver recuperato le richieste dell'owner");
break;
case JOINED_REQUEST:
String mail=null;
if (QueryManager.getInstance().getCurrentUser()!=null){
User current =QueryManager.getInstance().getCurrentUser();
mail = current.getPwAccount() != null ?
current.getPwAccount()
: current.getGmailAccount() != null ?
current.getGmailAccount()
: current.getFbAccount() != null ?
current.getFbAccount()
: null;
requests = QueryManager.getInstance().getUserPartecipation(mail);
}
else
requests = new ArrayList<Request>();
break;
default: //ALL_REQUEST case and all the other possibilities
requests = QueryManager.getInstance().getRequests();
break;
}
requestListFragment = new RequestList(requests, mode);
if (view.findViewById(R.id.detail_container) != null) {//TABLET CASE
twoPane = true;
getChildFragmentManager().beginTransaction()
.replace(R.id.request_list_container,requestListFragment,RequestList.ID)
.commit();
} else { //PHONE CASE:
getChildFragmentManager().beginTransaction()
.replace(R.id.container,requestListFragment,RequestList.ID)
.commit();
}
} catch (InflateException e) {
// is already there, just return view as it is
e.printStackTrace();
}
return view;
}
@Override
public void onRequestSelected(int position, Request request) {
if (twoPane) {
DetailContainerFragment detailContFrag = new DetailContainerFragment(request,mode);
getChildFragmentManager().beginTransaction()
.replace(R.id.detail_container, detailContFrag, DetailContainerFragment.ID).commit();
} else {
switch (mode) {//This empty switch if for future changes
case OWNER_REQUEST:
break;
case JOINED_REQUEST:
break;
default://ALL_REQUEST
break;
}
RequestDetail fragment = new RequestDetail(request,mode);
Fragment reqList=getChildFragmentManager().findFragmentByTag(RequestList.ID);
getChildFragmentManager().beginTransaction()
.hide(reqList)
.addToBackStack(RequestDetail.ID)
.add(R.id.container,fragment,RequestDetail.ID)
.commit();
}
}
@Override
public void onUserClicked(User user,String requestId) {
if (!twoPane) {
FeedbackDetail fragment = new FeedbackDetail(user,this.mode,requestId);
Fragment reqDetail=getChildFragmentManager().findFragmentByTag(RequestDetail.ID);
getChildFragmentManager().beginTransaction()
.hide(reqDetail)
.addToBackStack(FeedbackDetail.ID)
.add(R.id.container,fragment,FeedbackDetail.ID)
.commit();
} else {
/*DetailContainerFragment should take care of it*/
}
}
@Override
public void onRequestLoaded(List<Request> requests) {
System.out.println("Ho caricato: "+requests.size());
RequestList requestListFragment = (RequestList)getChildFragmentManager().findFragmentByTag(RequestList.ID);
switch (mode) {//Also this switch is for future changes, but the requests list is anyway fetched and assigned to RequestList above
case OWNER_REQUEST:
//TODO
break;
case JOINED_REQUEST:
//TODO
break;
default: //ALL_REQUEST
if (requestListFragment!=null)
requestListFragment.setRequestAdapter(requests);
break;
}
}
}
If i'm missing something important please, let me know. Thank you all in advance
EDIT: I forgot to say that the System.out that i placed show up in the console, so the "blank" fragment should have been created, and it should have passed through his onCreateView().
