Datas repeated in my ListFragment - android-fragments

Question

I encounter a problem with my ListFragment provided by Volley Library and hosted by a ViewPager ! So when i swipe follow Fragment and back to my previous ListFragment, datas are repeated again ! Why ? Please help me !
This my code :
Code for bind ListFragment:
public class AllConferencesFragment extends ListFragment {
// Variables
final String URL_ALL_CONFERENCES = "http://192.168.43.246/android_christEvent/all_events_conference.php";
//final String URL_ALL_CONFERENCES = "http://7avecdieu.org/android_christEvent/all_events_conference.php";
//private static String TAG = ConferenceActivity.class.getSimpleName();
ListView listView;
View view;
List<Event> eventLists = new ArrayList<Event>();
CustomListEventsAdapter customListEventsAdapter;
CircularProgressView circularProgressView;
// Contructeur
public AllConferencesFragment() {
}
// Creation du fragment
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
// Creation de la vue
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
view = inflater.inflate(R.layout.conferences_frag, container, false);
circularProgressView = (CircularProgressView) view.findViewById(R.id.circular_progress);
return view;
}
// Activité gestionnaire du fragment créé
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
circularProgressView.setVisibility(View.VISIBLE);
circularProgressView.startAnimation();
getListView();
//listView = (ListView) view.findViewById(R.id.list);
customListEventsAdapter = new CustomListEventsAdapter(getActivity(), eventLists);
//listView.setAdapter(customListEventsAdapter);
setListAdapter(customListEventsAdapter);
// On check si la cache est vide
Cache cache = AppController.getInstance().getRequestQueue().getCache();
Cache.Entry entry = cache.get(URL_ALL_CONFERENCES);
if (entry != null) {
circularProgressView.setVisibility(View.VISIBLE);
// Parcours des données de la cache de cette url passée en parametre
try {
String data = new String(entry.data, "UTF-8");
try {
parseJsonFeed(new JSONObject(data));
// notify data changes to list adapater
customListEventsAdapter.notifyDataSetChanged();
}
catch (JSONException e) {
e.printStackTrace();
}
}
catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
else {
JsonObjectRequest jsonReq = new JsonObjectRequest(Request.Method.GET,
URL_ALL_CONFERENCES,
null,
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
VolleyLog.d("Resultats ----> ", "Response: " + response.toString());
if (response != null) {
parseJsonFeed(response);
// notify data changes to list adapater
customListEventsAdapter.notifyDataSetChanged();
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d("Resultats ----> ", "Error: " + error.getMessage());
//progressBar.setVisibility(View.GONE);
circularProgressView.setVisibility(View.GONE);
}
});
// Adding request to volley request queue
AppController.getInstance().addToRequestQueue(jsonReq);
}
// Au Cliq sur un iem
getListView().setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent intent = new Intent(getContext(), DetailsEventsActivity.class);
intent.putExtra("position", position);
startActivity(intent);
}
});
}
/**
* Parsing json reponse and passing the data to event view list adapter
**/
private void parseJsonFeed(JSONObject response) {
try {
JSONArray eventArray = response.getJSONArray("events");
for (int i = 0; i < eventArray.length(); i++) {
JSONObject eventObj = (JSONObject) eventArray.get(i);
Event evt = new Event();
evt.setPriceEvent(eventObj.getString("event_price"));
// Image might be null sometimes
String image = eventObj.isNull("event_thumb") ? null : eventObj.getString("event_thumb");
evt.setThumbEvent(image);
evt.setNameEvent(eventObj.getString("event_name"));
evt.setPlaceEvent(eventObj.getString("event_place"));
evt.setHourEvent(eventObj.getString("event_hour"));
evt.setDateEvent(eventObj.getString("event_date"));
eventLists.add(evt);
}
circularProgressView.setVisibility(View.GONE);
}
catch (JSONException e) {
e.printStackTrace();
}
}
#Override
public void onDestroy() {
super.onDestroy();
//progressBar.setVisibility(View.GONE);
}
}
Code for Volley Application :
public class AppController extends Application {
public static final String TAG = AppController.class.getSimpleName();
private RequestQueue mRequestQueue;
private ImageLoader mImageLoader;
private static AppController mInstance;
#Override
public void onCreate() {
super.onCreate();
mInstance = this;
}
public static synchronized AppController getInstance() {
return mInstance;
}
public RequestQueue getRequestQueue() {
if(mRequestQueue == null) {
mRequestQueue = Volley.newRequestQueue(getApplicationContext());
}
return mRequestQueue;
}
public ImageLoader getImageLoader() {
getRequestQueue();
if (mImageLoader == null) {
mImageLoader = new ImageLoader(this.mRequestQueue, new LruBitmapCache());
}
return this.mImageLoader;
}
public <T> void addToRequestQueue(Request<T> req, String tag) {
// Set the default tag if tag is empty
req.setTag(TextUtils.isEmpty(tag) ? TAG : tag);
getRequestQueue().add(req);
}
public <T> void addToRequestQueue(Request<T> req) {
req.setTag(TAG);
getRequestQueue().add(req);
}
public void cancelPendingRequests(Object tag) {
if (mRequestQueue != null) {
mRequestQueue.cancelAll(tag);
}
}
}
My parseJsonEvent :
private void parseJsonEvent(JSONObject response) {
try {
JSONArray eventArray = response.getJSONArray(TAG_EVENTS);
// Loop Json node
for (int i = 0; i < eventArray.length(); i++) {
JSONObject eventObj = (JSONObject) eventArray.get(i);
// Create event object
Event evt = new Event();
evt.setIdEvent(eventObj.getInt(TAG_EVENT_ID));
evt.setDateEvent(eventObj.getString(TAG_EVENT_DATE));
evt.setPriceEvent(eventObj.getString(TAG_EVENT_PRICE));
evt.setNameEvent(eventObj.getString(TAG_EVENT_NAME));
evt.setCountryEvent(eventObj.getString(TAG_EVENT_COUNTRY));
evt.setPlaceEvent(eventObj.getString(TAG_EVENT_PLACE));
evt.setTypeEvent(eventObj.getString(TAG_EVENT_TYPE));
// event thumbnail
String eventUrl = eventObj.isNull(TAG_EVENT_THUMB) ? null : eventObj.getString(TAG_EVENT_THUMB);
evt.setThumbEvent(eventUrl);
// Adding in the list object
eventList.add(evt);
// notify list view to adding
}
adapter.notifyDataSetChanged();
}
catch (JSONException e) {
e.printStackTrace();
}
}
My Main Activity :
public class ConferenceActivity extends AppCompatActivity {
private Toolbar toolbarConference;
private TabLayout tabLayoutConference;
private ViewPager viewPagerConference;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Typeface tf = Typeface.createFromAsset(getAssets(), fontPath);
//getSupportActionBar().setDisplayHomeAsUpEnabled(true);
toolbarConference = (Toolbar) findViewById(R.id.toolbar_conference);
setSupportActionBar(toolbarConference);
viewPagerConference = (ViewPager) findViewById(R.id.viewpager_conference);
setupViewPager(viewPagerConference);
tabLayoutConference = (TabLayout) findViewById(R.id.tabs_conference);
tabLayoutConference.setupWithViewPager(viewPagerConference);
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new AllEventsConferenceFragments(), "TOUS");
adapter.addFragment(new ThisWeekFragment(), "AUJOURD'HUI");
adapter.addFragment(new TodayEventFragment(), "CETTE SEMAINE");
adapter.addFragment(new AllEventsConferenceFragments(), "SEMAINE PROCHAINE");
adapter.addFragment(new ThisWeekFragment(), "CE MOIS CI");
adapter.addFragment(new TodayEventFragment(), "MOIS PROCHAIN");
adapter.addFragment(new AllEventsConferenceFragments(), "ANNEE EN COURS");
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
}

Answer 1

public class AllConferencesFragment extends ListFragment {
private boolean loaded = false;
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
if(loaded){
return;
}
loaded = true;
JsonObjectRequest jsonReq = new JsonObjectRequest(Request.Method.GET,
URL_ALL_CONFERENCES,
null,
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
VolleyLog.d("Resultats ----> ", "Response: " + response.toString());
if (response != null) {
parseJsonFeed(response);
// notify data changes to list adapater
customListEventsAdapter.notifyDataSetChanged();
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d("Resultats ----> ", "Error: " + error.getMessage());
//progressBar.setVisibility(View.GONE);
circularProgressView.setVisibility(View.GONE);
}
});
// Adding request to volley request queue
AppController.getInstance().addToRequestQueue(jsonReq);
}
}