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Sto utilizzando un ViewPager nella mia applicazione e ho tre schede al suo interno; Sto usando ViewPager all'interno di un frammento. Ora il mio problema qui è che sto ricevendo dati correttamente durante il caricamento dell'applicazione, ma quando vado alla pagina successiva e poi di nuovo a ViewPager, i dati vengono persi e le schede non funzionano. Per favore aiutami. Qui di seguito è il mio codice:I dati di ViewPager sono andati persi al ritorno dalla schermata successiva
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;
}
}
Ecco il mio adattatore:
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;
}
}
E qui è uno dei miei frammenti:
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();
}
}
E i frammenti rimasti lo stesso aspetto. Mi aiuti per favore.
Ho provato sia 'getSupportFragmentManager()' che 'getFragmentManager()' ma ho perso 'getChildFragmentManager()' e ha funzionato. Grazie! A volte lo sviluppo di Android è un disastro. – nilsi
Grazie funziona bene. –