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Los datos de ViewPager se pierden al volver de la siguiente pantalla

Estoy utilizando un ViewPager en mi aplicación y tengo tres pestañas en él; Estoy utilizando ViewPager dentro de un fragmento. Ahora mi problema aquí es, estoy recibiendo datos correctamente al cargar la aplicación, pero cuando voy a la página siguiente y luego de nuevo a ViewPager, los datos se pierden y las pestañas no funcionan. Por favor, ayúdame. A continuación se muestra mi código:

import com.devpoint.rprtjobs.R; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentTabHost; import android.support.v4.view.ViewPager; import android.support.v4.view.ViewPager.OnPageChangeListener; import android.support.v7.app.ActionBarActivity; import android.support.v7.widget.Toolbar; import android.os.Bundle; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.support.design.widget.TabLayout; public class MainActivity extends Fragment { // Declaring Your View and Variables Toolbar toolbar; ViewPager pager; SwipeViewPagerAdapter adapter; SlidingTabLayout tabs; CharSequence Titles[]={"OnGoing","UpComing","Expired"}; int Numboftabs =3; private View rootView; @SuppressWarnings("deprecation") public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { try { rootView = inflater.inflate(R.layout.activity_main, container, false); adapter = new SwipeViewPagerAdapter(getActivity().getSupportFragmentManager(),Titles,Numboftabs); // Assigning ViewPager View and setting the adapter pager = (ViewPager) rootView.findViewById(R.id.pager); pager.setAdapter(adapter); // Assiging the Sliding Tab Layout View tabs = (SlidingTabLayout) rootView.findViewById(R.id.tabs); tabs.setDistributeEvenly(true); // To make the Tabs Fixed set this true, This makes the tabs Space Evenly in Available width // Setting Custom Color for the Scroll bar indicator of the Tab View tabs.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() { @Override public int getIndicatorColor(int position) { return getResources().getColor(R.color.tabsScrollColor); } }); // Setting the ViewPager For the SlidingTabsLayout tabs.setViewPager(pager); pager.setOffscreenPageLimit(3); pager.setOnPageChangeListener(new OnPageChangeListener() { public void onPageScrollStateChanged(int state) {} public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {} public void onPageSelected(int position) { if(position ==0) { SwipeViewPagerAdapter.Pagename = "ListOnGoing"; } else if(position ==1) { SwipeViewPagerAdapter.Pagename = "ListUpComing"; } else if(position ==2) { SwipeViewPagerAdapter.Pagename = "ListExpired"; } } }); } catch(Exception e) { e.printStackTrace(); } return rootView; } } 

Aquí está mi adaptador:

 import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentPagerAdapter; import android.support.v4.app.FragmentStatePagerAdapter; /** * Created by Edwin on 15/02/2015. */ public class SwipeViewPagerAdapter extends FragmentPagerAdapter { CharSequence Titles[]; // This will Store the Titles of the Tabs which are Going to be passed when ViewPagerAdapter is created int NumbOfTabs; // Store the number of tabs, this will also be passed when the ViewPagerAdapter is created public static String Pagename="ListOnGoing"; // Build a Constructor and assign the passed Values to appropriate values in the class public SwipeViewPagerAdapter(FragmentManager fm,CharSequence mTitles[], int mNumbOfTabsumb) { super(fm); this.Titles = mTitles; this.NumbOfTabs = mNumbOfTabsumb; } //This method return the fragment for the every position in the View Pager @Override public Fragment getItem(int position) { switch (position) { case 0: //Pagename = "ListOnGoing"; ListOnGoing mListOnGoing = new ListOnGoing(); return mListOnGoing; case 1: //Pagename = "ListUpComing"; ListUpComing mListUpComing = new ListUpComing(); return mListUpComing; case 2: //Pagename = "ListExpired"; ListExpaire mListExpaire = new ListExpaire(); return mListExpaire; default: return null; } } // This method return the titles for the Tabs in the Tab Strip @Override public CharSequence getPageTitle(int position) { return Titles[position]; } // This method return the Number of tabs for the tabs Strip @Override public int getCount() { return NumbOfTabs; } } 

Y aquí está uno de mis fragmentos:

 import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.concurrent.CopyOnWriteArrayList; @SuppressLint("ShowToast") public class ListOnGoing extends Fragment implements OnItemClickListener { Boolean isInternetPresent = false; ConnectionDetector connectdetector; public static ListView swipelisview; Activity activity; public static ProductListAdapter productListAdapter; SharedPreference sharedPreference; String LoggedIn; boolean fragmentAlreadyLoaded = false; @SuppressWarnings("deprecation") @Override public void onAttach(Activity activity) { super.onAttach(activity); this.listener = (FragmentActivity) activity; } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); } @Override public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { try { super.onViewCreated(view, savedInstanceState); swipelisview = (ListView) rootView.findViewById(R.id.list); View emptyView = rootView.findViewById(R.id.emptyView); swipelisview.setEmptyView(emptyView); if (savedInstanceState == null && !fragmentAlreadyLoaded) { fragmentAlreadyLoaded = true; repoObject = SplashScreen.getRepo(); session = new SessionManager(getActivity()); HashMap<String, String> Radious = session.getRadiousName(); Radiosname = Radious.get(SessionManager.KEY_RadiousName); //LoadActivity.Status=""; GPlaces = new GetAllGooglePlaces(); GPlaces.GetOpportunityList("", Radiosname, getActivity()); DisPlayOppList(); } productListAdapter = new ProductListAdapter(getActivity(), GetAllGooglePlaces.ArrayListOngoing); swipelisview.setAdapter(productListAdapter); productListAdapter.notifyDataSetChanged(); session = new SessionManager(getActivity()); HashMap<String, String> Radious = session.getRadiousName(); Radiosname = Radious.get(SessionManager.KEY_RadiousName); searchedit = (EditText) rootView.findViewById(R.id.searchbox); Button searchbtn = (Button) rootView.findViewById(R.id.searchbtn); searchedit = (EditText) rootView.findViewById(R.id.searchbox); clearbtn = (Button) rootView.findViewById(R.id.clearbtn); searchedit.addTextChangedListener(watch); clearbtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { LoadActivity.Status=""; searchedit.setText(""); GPlaces.GetOpportunityList("", Radiosname, getActivity()); DisPlayOppList(); } }); searchbtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { getActivity().runOnUiThread(new Runnable() { public void run() { multipleCat = ""; GetAllGooglePlaces.ArrayListOngoing = new CopyOnWriteArrayList<>(); SearchText = searchedit.getText() .toString(); LoadActivity.Status = "Search"; if (LoadActivity.isOnline) { GPlaces.GetOpportunityList(SearchText, Radiosname, getActivity()); DisPlayOppList(); } else { List<OpportunityTable> alloffers = repoObject.roffertable .getAlloffersbySearchKeyword(SearchText); if (alloffers != null) { GPlaces.FillArrayListOffline(alloffers,"OnGoing"); } } } }); } }); HashMap<String, String> user = session.getLogin(); LoggedIn = user.get(SessionManager.KEY_Login); if (LoggedIn == null) { LoggedIn = ""; } connectdetector = new ConnectionDetector(getActivity()); try { // Check if Internet present isInternetPresent = connectdetector.isConnectingToInternet(); } catch (Exception e) { e.printStackTrace(); PostLogcatErrors ple = new PostLogcatErrors(); ple.PostLogcatErorrs(e); } footerlayout = (LinearLayout) rootView.findViewById(R.id.footerlayout); footerlayout.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { swipelisview.requestDisallowInterceptTouchEvent(true); return true; } }); swipelisview.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView<?> arg0, View v, final int position, long id) { InputMethodManager imm = (InputMethodManager) getActivity() .getSystemService(Context.INPUT_METHOD_SERVICE); imm.hideSoftInputFromWindow(swipelisview.getWindowToken(), 0); try { final DetailsViewpagerFragment mDetailsViewpagerFragment = new DetailsViewpagerFragment(); String url; if (LoadActivity.isOnline) { progresdialog = new ProgressDialog(getActivity()); progresdialog.setMessage(Html .fromHtml("<b>Search</b><br/>Loading Details...")); progresdialog.setIndeterminate(false); progresdialog.setCancelable(false); progresdialog.show(); ListDetails product = GetAllGooglePlaces.ArrayListOngoing .get(position); OpportunityID = product.getOfferID(); url = LoadActivity.BaseUri + "SaveUserViewedOpportunities"; JsonObjectRequest jsObjRequest; jsObjRequest = new JsonObjectRequest( Request.Method.POST, url, getSaveViewUserParams(), new Response.Listener<JSONObject>() { @Override public void onResponse(JSONObject response) { pagename = "Userplaceslist"; mDetailsViewpagerFragment .setClickList(position); FragmentManager fragment = getFragmentManager(); fragment.beginTransaction() .replace(R.id.frame_container, mDetailsViewpagerFragment) .commit(); LoadActivity.CURRENTFRAGMENT = EnumModuleTags.SinglePlaceActivity; ModuleFragmentBackStackingClass .AddtoStack( mDetailsViewpagerFragment, EnumModuleTags.SinglePlaceActivity, getString(R.string.mainfrgment_rprt)); LoadActivity.updateActionbarMenu(); progresdialog.dismiss(); } }, new Response.ErrorListener() { @Override public void onErrorResponse( VolleyError error) { Toast.makeText(getActivity(), "False", Toast.LENGTH_LONG).show(); progresdialog.dismiss(); } }); AppController.getInstance().addToRequestQueue( jsObjRequest); } else { mDetailsViewpagerFragment.setClickList(position); FragmentManager fragment = getFragmentManager(); fragment.beginTransaction() .replace(R.id.frame_container, mDetailsViewpagerFragment).commit(); LoadActivity.CURRENTFRAGMENT = EnumModuleTags.SinglePlaceActivity; ModuleFragmentBackStackingClass.AddtoStack( mDetailsViewpagerFragment, EnumModuleTags.SinglePlaceActivity, getString(R.string.mainfrgment_rprt)); } } catch (Exception e) { e.printStackTrace(); PostLogcatErrors ple = new PostLogcatErrors(); ple.PostLogcatErorrs(e); } } private JSONObject getSaveViewUserParams() { JSONObject params = new JSONObject(); HashMap<String, String> UserId = session.getUserID(); String UserIdVal = UserId.get(SessionManager.KEY_UserID); if (!(UserIdVal == null)) { UserIdVal = UserId.get(SessionManager.KEY_UserID); } else { UserIdVal = "0"; } try { params.put("UserId", UserIdVal); params.put("OpportunityID", OpportunityID); params.put("UserViewedID", 0); params.put("Shortlisted", true); params.put("KeyValue", null); } catch (JSONException e) { e.printStackTrace(); PostLogcatErrors ple = new PostLogcatErrors(); ple.PostLogcatErorrs(e); } return params; } }); // Click The FavoritesItem on LongPress swipelisview.setOnItemLongClickListener(new OnItemLongClickListener() { @Override public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) { InputMethodManager imm; imm = (InputMethodManager) getActivity() .getSystemService(Context.INPUT_METHOD_SERVICE); imm.hideSoftInputFromWindow(swipelisview.getWindowToken(), 0); try { ImageView button; button = (ImageView) view .findViewById(R.id.fav_checkbox); String tag = button.getTag().toString(); if (tag.equals(getString(R.string.grey_favcolor))) { sharedPreference.addFavorite(activity, GetAllGooglePlaces.ArrayListOngoing.get(position)); button.setTag(getString(R.string.red_favcolor)); button.setImageResource(R.drawable.checked); } else if (tag.equals(getString(R.string.red_favcolor))){ sharedPreference.removeFavorite(activity, GetAllGooglePlaces.ArrayListOngoing.get(position)); button.setTag(getString(R.string.grey_favcolor)); button.setImageResource(R.drawable.unchecked); } return true; } catch (NotFoundException e) { e.printStackTrace(); PostLogcatErrors ple = new PostLogcatErrors(); ple.PostLogcatErorrs(e); Toast.makeText(getActivity(), e.getMessage(), Toast.LENGTH_LONG).show(); e.printStackTrace(); } return true; } }); // Code placed here will be executed even when the fragment comes from // backstack } catch (Exception e) { e.printStackTrace(); PostLogcatErrors ple = new PostLogcatErrors(); ple.PostLogcatErorrs(e); } } // String APIkey ="AIzaSyCAekTB0o1MuSYvUb-8HTZxhlJHE8yBUfI"; @Override public void onCreate(Bundle savedInstanceState) { try { super.onCreate(savedInstanceState); activity = getActivity(); sharedPreference = new SharedPreference(); //setRetainInstance(true); } catch (Exception e) { e.printStackTrace(); PostLogcatErrors ple = new PostLogcatErrors(); ple.PostLogcatErorrs(e); } } @SuppressWarnings("static-access") @SuppressLint({ "CutPasteId", "ClickableViewAccessibility" }) @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { try { //setRetainInstance(true); try { Tracker t = ((Analytics) getActivity().getApplication()).getTracker( TrackerName.APP_TRACKER); t.setScreenName("UserPlaces Listview"); t.send(new HitBuilders.AppViewBuilder().build()); } catch(Exception e) { Toast.makeText(getActivity().getApplication(), "Error"+e.getMessage(), 1).show(); } rootView = inflater.inflate(R.layout.user_places_listview, container, false); swipelisview = (ListView) rootView.findViewById(R.id.list); View emptyView = rootView.findViewById(R.id.emptyView); swipelisview.setEmptyView(emptyView); return rootView; } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } return rootView; } TextWatcher watch = new TextWatcher(){ @Override public void afterTextChanged(Editable arg0) { } @Override public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) { } @Override public void onTextChanged(CharSequence s, int a, int b, int c) { if(c == 0){ clearbtn.setVisibility(View.GONE); } else { clearbtn.setVisibility(View.VISIBLE); } }}; protected void LoadSearchPlaces(String searchparam) { try { if (LoadActivity.isOnline) { JsonArrayRequest movieReq = new JsonArrayRequest("http://192.168.2.10/RPRT.WebApi/api/RPRT/" + "SearchPlaces/"+searchparam, new Response.Listener<JSONArray>() { @Override public void onResponse(JSONArray response) { List<HashMap<String, String>> aList = new ArrayList<>(); for (int i = 0; i < response.length(); i++) { JSONObject json_data; try { json_data = response.getJSONObject(i); HashMap<String, String> hm = new HashMap<>(); hm.put("Address", json_data.getString("Address")); hm.put("City", json_data.getString("City")); hm.put("Latitude", json_data.getString("Latitude")); hm.put("Longitude", json_data.getString("Longitude")); aList.add(hm); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } } String[] from = { "Address"} ; int[] to = { R.id.tv }; SimpleAdapter adapterId = new SimpleAdapter(getActivity(), aList, R.layout.user_places_dropdown_listitem, from, to); //final AutoCompleteTextView autoCompView = (AutoCompleteTextView) rootView.findViewById(R.id.autoCompleteTextView); autoCompView.setAdapter(adapterId); autoCompView.setThreshold(1); // Pname.setThreshold(1); autoCompView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @SuppressWarnings("unchecked") @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { HashMap<String, String> hm = (HashMap<String, String>) parent .getAdapter().getItem(position); autoCompView.setText(hm.get("Address")); SplashScreen.nwLocation.setLatitude(Double.parseDouble(hm.get("Latitude"))); SplashScreen.nwLocation.setLongitude(Double.parseDouble(hm.get("Longitude"))); HashMap<String, String> Radious = session.getRadiousName(); final String Radiosname; Radiosname = Radious.get(SessionManager.KEY_RadiousName); multipleCat=""; ProgressDialog progresdialog = new ProgressDialog(getActivity()); progresdialog.setMessage(Html .fromHtml("<b>Search</b><br/>Loading Details...")); progresdialog.setIndeterminate(false); progresdialog.setCancelable(false); //progresdialog.show(); LoadActivity.Status=""; GPlaces.GetOpportunityList(SearchText, Radiosname, getActivity()); DisPlayOppList(); searchdialog.cancel(); } }); } }, new com.android.volley.Response.ErrorListener() { @Override public void onErrorResponse( VolleyError error) { } }); AppController.getInstance().addToRequestQueue(movieReq); } } catch (Exception e) { e.printStackTrace(); } } private void DisPlayOppList() { try { pdialog = new ProgressDialog(getActivity()); pdialog.setMessage(Html.fromHtml("<b>Search</b><br/>Loading Details...")); pdialog.setIndeterminate(false); pdialog.setCancelable(false); if(LoadActivity.Status.equals("Slidemenulist")) { int CategoryId = 0; switch (CopyOfListOnGoing.multipleCat) { case "Books": CategoryId = 1; break; case "BeautyandFashion": CategoryId = 2; break; case "Electronic": CategoryId = 3; break; case "Food": CategoryId = 4; break; case "HomeService": CategoryId = 5; break; case "Jobs": CategoryId = 6; break; case "RealEstate": CategoryId = 7; break; case "Vehicles": CategoryId = 8; break; } List<OpportunityTable> alloffers = repoObject.roffertable .getAllCatOpp(CategoryId , Radiosname); if (alloffers != null) { GPlaces.FillArrayListOffline(alloffers,"OnGoing"); } } else { List<OpportunityTable> alloffers = repoObject.roffertable .getAlloffers(Integer.parseInt(Radiosname)); if (alloffers != null) { GPlaces.FillArrayListOffline(alloffers,"OnGoing"); } } } catch (Exception e) { e.printStackTrace(); PostLogcatErrors ple = new PostLogcatErrors(); ple.PostLogcatErorrs(e); } } public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) { InputMethodManager imm = (InputMethodManager) getActivity().getSystemService(Context.INPUT_METHOD_SERVICE); imm.hideSoftInputFromWindow(getActivity().getCurrentFocus().getWindowToken(), 0); multipleCat = ""; DisPlayOppList(); } /* @Override public void onResume() { Log.e("DEBUG", "onResume of Userplace ListView"); super.onResume(); }*/ @Override public void onPause() { Log.e("DEBUG", "OnPause of Userplace ListView"); super.onPause(); } } 

Y los fragmentos restantes parecen iguales. Por favor, ayúdame.

4 Solutions collect form web for “Los datos de ViewPager se pierden al volver de la siguiente pantalla”

Después de un poco reasearch tengo solución para mi problema, que acabo de llamar getChildFragmentManager () en lugar de getactivity (). GetSupportFragmentmanager (). Esto resolvió mi problema.Gracias StackOverFlow

En su adaptador extienda FragmentStatePagerAdapter en lugar de FragmentPagerAdapter, resolverá su problema y si está usando ViewPager dentro de un fragmento, entonces necesita usar getChildFragmentManager () en lugar de getActivity (). GetSupportFragmentManager (). Hágamelo saber si usted tiene cualquier problema.

Espero que esto te ayude 🙂

 public float getPageWidth(int position) { if (position == 0 || position == 2) { return 0.8f; } return 1f; } 
 pager = (ViewPager) rootView.findViewById(R.id.pager); pager.setOffscreenPageLimit(2);// no of fragments 
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