Appel de plusieurs services à l'aide de Volley

Question

J'ai une MainActivity dans laquelle les onglets Swipeable sont créés et à partir de là, deux fragments sont appelés. J'ai 2 webservice pour le fragment A et le fragment B où je dois analyser les données provenant du serveur. J'utilise volley. Quand je suis dans le premier fragment; les services Web sont appelés et les données ne sont pas chargées pour la première fois. Mais dans la deuxième fois, cela se voit correctement, mais cela devrait être ainsi que lorsque je suis dans le fragment A, le service du fragment A devrait être appelé et quand je suis dans le fragment B, le service du fragment B devrait être appelé. J'attache les extraits de code.

MainActivity.java

public class MainActivity extends AppCompatActivity { 
    DrawerLayout mDrawerLayout; 
    NavigationView mNavigationView; 
    FragmentManager mFragmentManager; 
    FragmentTransaction mFragmentTransaction; 

    int status = 0 ; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     /** 
     *Setup the DrawerLayout and NavigationView 
     */ 

     mDrawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout); 
     mNavigationView = (NavigationView) findViewById(R.id.shitstuff); 
     android.support.v7.widget.Toolbar toolbar = (android.support.v7.widget.Toolbar) findViewById(R.id.toolbar); 
     // Show menu icon 

     setSupportActionBar(toolbar); 
     getSupportActionBar().setDisplayShowHomeEnabled(true); 

     /** 
     * Lets inflate the very first fragment 
     * Here , we are inflating the NewsFragment as the first Fragment 
     */ 

     mFragmentManager = getSupportFragmentManager(); 
     mFragmentTransaction = mFragmentManager.beginTransaction(); 
     mFragmentTransaction.replace(R.id.containerView, new NewsFragment()).commit(); 

//  mNavigationView.setBackgroundColor(Color.parseColor("#CFCFCF")); 
     /** 
     * Setup click events on the Navigation View Items. 
     */ 

     mNavigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() { 
      @Override 
      public boolean onNavigationItemSelected(MenuItem menuItem) { 
       mDrawerLayout.closeDrawers(); 


       if (menuItem.getItemId() == R.id.nav_item_sent) { 
        FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction(); 
        fragmentTransaction.replace(R.id.containerView, new SportsFragment()).commit(); 

        status = 1; 

        if (status == 1){ 

        } 

       } 

       if (menuItem.getItemId() == R.id.nav_item_inbox) { 
        FragmentTransaction xfragmentTransaction = mFragmentManager.beginTransaction(); 
        xfragmentTransaction.replace(R.id.containerView, new NewsFragment()).commit(); 
       } 

       if (menuItem.getItemId() == R.id.nav_item_sent){ 
        FragmentTransaction xfragmentTransaction = mFragmentManager.beginTransaction(); 
        xfragmentTransaction.replace(R.id.containerView, new VideosFragment()).commit(); 
       } 

       if (menuItem.getItemId() == R.id.nav_item_draft) { 
        FragmentTransaction xfragmentTransaction = mFragmentManager.beginTransaction(); 
        xfragmentTransaction.replace(R.id.containerView, new OpinionFragment()).commit(); 
       } 

       if (menuItem.getItemId() == R.id.nav_item_sports) { 
        FragmentTransaction xfragmentTransaction = mFragmentManager.beginTransaction(); 
        xfragmentTransaction.replace(R.id.containerView, new SportsFragment()).commit(); 
       } 

       if (menuItem.getItemId() == R.id.nav_item_weather) { 
        FragmentTransaction xfragmentTransaction = mFragmentManager.beginTransaction(); 
        xfragmentTransaction.replace(R.id.containerView, new NewsFragment()).commit(); 
       } 

       return false; 
      } 

     }); 

     /** 
     * Setup Drawer Toggle of the Toolbar 
     */ 



    ActionBarDrawerToggle mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, toolbar, R.string.app_name, 
      R.string.app_name); 

    mDrawerLayout.setDrawerListener(mDrawerToggle); 

    mDrawerToggle.syncState(); 

} 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.menu_main, menu); 

     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     switch (item.getItemId()) { 
      case R.id.action_about_us: 
       Intent intent = new Intent(MainActivity.this, AboutUs.class); 
       startActivity(intent); 
       return true; 

      case R.id.action_terms_of_use: 
       Intent intent_two = new Intent(MainActivity.this, TermsUse.class); 
       startActivity(intent_two); 
       return true; 

      case R.id.action_privacy_policy: 
       Intent intent_three = new Intent(MainActivity.this, PrivacyPolicy.class); 
       startActivity(intent_three); 
       return true; 

      case R.id.action_contact_us: 
       Intent intent_four = new Intent(MainActivity.this, ContactUs.class); 
       startActivity(intent_four); 

      case R.id.search: 
//    hidetext(); 
       Toast.makeText(MainActivity.this, "In the development Phase... Thank You...", Toast.LENGTH_SHORT).show(); 
       return true; 
      default: 
       return super.onOptionsItemSelected(item); 
     } 
    } 

// private void hidetext() { 
// 
//  Intent i = new Intent(MainActivity.this, SearchResultActivity.class); 
//  startActivity(i); 
// } 
} 

TopNewsFragment

public class TopNewsFragment extends Fragment { 

    // Log tag 
    private static final String TAG = MainActivity.class.getSimpleName(); 

    private static final String url = "http://sikkimexpress.itstunner.com/api/homenewslist/topnews"; 
    private ProgressDialog pDialog; 
    private List<Movie> movieList = new ArrayList<Movie>(); 
    Movie movie; 
    private ListView listView; 
    private CustomListAdapter adapter; 
    String imageURL = "", title = "", description = ""; 
    public static final String KEY_ID = "news_id"; 
    public static final String KEY_HEADURL = "news_url"; 
    public static final String KEY_DETAILS = "news_details"; 
    public static final String KEY_TITLE = "news_title"; 

    RequestQueue requestQueue; 

    public TopNewsFragment() { 
     // Required empty public constructor 
    } 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     final View rootView = inflater.inflate(R.layout.fragment_news, container, false); 

     listView = (ListView) rootView.findViewById(R.id.list); 

     listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 

      @Override 
      public void onItemClick(AdapterView<?> adapterView, View view, int Position, 
            long offset) { 
       // TODO Auto-generated method stub 
       Movie item = (Movie) adapter.getItem(Position); 
       Intent intent = new Intent(rootView.getContext(), DetailsPage.class); 
       intent.putExtra(KEY_ID, item.getNewsId()); 
       intent.putExtra(KEY_HEADURL, item.getThumbnailUrl()); 
       intent.putExtra(KEY_TITLE, item.getTitle()); 
       intent.putExtra(KEY_DETAILS, item.getDescription()); 

       startActivity(intent); 


      } 
     }); 

//  requestQueue = Volley.newRequestQueue(getActivity()); 
     adapter = new CustomListAdapter(getActivity(), movieList); 
     listView.setAdapter(adapter); 

     pDialog = new ProgressDialog(getActivity()); 
     pDialog.setMessage("Loading...Please Wait..."); 
     pDialog.setCancelable(false); 
     pDialog.show(); 

     Volley.newRequestQueue(getActivity()).add(new JsonObjectRequest(Request.Method.GET, url, new Response.Listener<JSONObject>() { 
      @Override 
      public void onResponse(JSONObject response) { 
       hidePDialog(); 
       try { 
        JSONArray jsonArray = response.getJSONArray("HomeNews"); 

//     if (jsonArray.length() == 0) { 
//      new AlertDialog.Builder(getActivity()) 
//        .setTitle("Alert") 
//        .setMessage("No Items found...") 
//        .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() { 
//         public void onClick(DialogInterface dialog, int which) { 
//          // continue with delete 
//         } 
//        }) 
//        .setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() { 
//         public void onClick(DialogInterface dialog, int which) { 
//          // do nothing 
//         } 
//        }) 
//        .setIcon(android.R.drawable.ic_dialog_alert) 
//        .show(); 
//     } 

        for (int i = 0; i < jsonArray.length(); i++) { 
         JSONObject homenews = jsonArray.getJSONObject(i); 
         Movie movie = new Movie(); 
         movie.setNewsId(homenews.getString("NewsId")); 
         movie.setDateTime(homenews.getString("DateTime")); 
         movie.setNewsType(homenews.getString("NewsType")); 
         movie.setTitle(homenews.getString("Title")); 
         title = movie.setTitle(homenews.getString("Title")); 
         description = movie.setDescription(homenews.getString("Description")); 
         movie.setDescription(homenews.getString("Description")); 
         imageURL = movie.setThumbnailUrl(homenews.getString("MainImageThumbnail")); 
         movie.setThumbnailUrl(homenews.getString("MainImageThumbnail")); 

         movieList.add(movie); 

         System.out.println("Setting up in ListView"); 
//      System.out.println("Result:- " + newsId + " " + dateTime + " " + newsType + " " + title + " " + description + " " + mainImageURL); 
        } 
       } catch (JSONException e) { 
        e.printStackTrace(); 
       } 
       adapter.notifyDataSetChanged(); 
      } 
     }, new Response.ErrorListener() { 
      @Override 
      public void onErrorResponse(VolleyError error) { 
//    new AlertDialog.Builder(getActivity()) 
//      .setTitle("No Connectivity ") 
//      .setMessage("Please check your internet connectivity!") 
//      .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() { 
//       public void onClick(DialogInterface dialog, int which) { 
//        // continue with delete 
//       } 
//      }) 
//        //.setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() { 
//        //public void onClick(DialogInterface dialog, int which) { 
//        // do nothing 
//        //} 
//        //}) 
//      .setIcon(android.R.drawable.ic_dialog_alert) 
//      .show(); 
       hidePDialog(); 
      } 
     })); 

//  AppController.getInstance().addToRequestQueue(jsonObjectRequest); 
//  requestQueue.add(jsonObjectRequest); 
     return rootView; 
    } 

    @Override 
    public void onAttach(Activity activity) { 
     super.onAttach(activity); 
    } 

    @Override 
    public void onDetach() { 
     super.onDetach(); 
    } 

    private void hidePDialog() { 
     if (pDialog != null) { 
      pDialog.dismiss(); 
      pDialog = null; 
     } 
    } 
} 

LatestNewsFragment.java

public class LatestNewsFragment extends Fragment { 

    // Log tag 
    private static final String TAG = MainActivity.class.getSimpleName(); 

    private static final String url = "http://sikkimexpress.itstunner.com/api/homenewslist/latest"; 
    private ProgressDialog pDialog; 
    private List<Movie> movieList = new ArrayList<Movie>(); 
    private ListView listView; 
    private CustomListAdapter adapter; 
    // contacts JSONArray 
    private JSONArray users = null; 
    RequestQueue requestQueue; 
    public static final String KEY_HEADURL="news_url"; 
    public static final String KEY_DETAILS="news_details"; 
    public static final String KEY_TITLE = "news_title"; 

    public LatestNewsFragment() { 
     // Required empty public constructor 
    } 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     final View rootView = inflater.inflate(R.layout.fragment_news, container, false); 

     listView = (ListView) rootView.findViewById(R.id.list); 

//  requestQueue = Volley.newRequestQueue(getActivity()); 
     adapter = new CustomListAdapter(getActivity(), movieList); 
     listView.setAdapter(adapter); 

     listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 

      @Override 
      public void onItemClick(AdapterView<?> adapterView, View view, int Position, 
            long offset) { 
       // TODO Auto-generated method stub 
       Movie item = (Movie) adapter.getItem(Position); 
       Intent intent = new Intent(rootView.getContext(), DetailsPage.class); 
//    intent.putExtra("URL", movie.getThumbnailUrl()); 
//    intent.putExtra("title", movie.getTitle()); 
//    intent.putExtra("description", movie.getDescription()); 

       intent.putExtra(KEY_HEADURL, item.getThumbnailUrl()); 
       intent.putExtra(KEY_TITLE, item.getTitle()); 
       intent.putExtra(KEY_DETAILS, item.getDescription()); 

       startActivity(intent); 


      } 
     }); 

     pDialog = new ProgressDialog(getActivity()); 
     // Showing progress dialog before making http request 
     pDialog.setMessage("Loading...Please Wait..."); 
     pDialog.setCancelable(false); 
     pDialog.show(); 

     Volley.newRequestQueue(getActivity()).add(new JsonObjectRequest(Request.Method.GET, url, new Response.Listener<JSONObject>() { 
//   JsonObjectRequest jsonObjectRequest = 

      @Override 
      public void onResponse(JSONObject response) { 
       try { 
        hidePDialog(); 

        JSONArray jsonArray = response.getJSONArray("HomeNews"); 

//     if (jsonArray.length() == 0){ 
//      new AlertDialog.Builder(getActivity()) 
//        .setTitle("Alert") 
//        .setMessage("No Items found...") 
//        .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() { 
//         public void onClick(DialogInterface dialog, int which) { 
//          // continue with delete 
//         } 
//        }) 
//        .setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() { 
//         public void onClick(DialogInterface dialog, int which) { 
//          // do nothing 
//         } 
//        }) 
//        .setIcon(android.R.drawable.ic_dialog_alert) 
//        .show(); 
//     } 

        for (int i = 0; i < jsonArray.length(); i++) { 
         JSONObject homenews = jsonArray.getJSONObject(i); 
         Movie movie = new Movie(); 
         movie.setNewsId(homenews.getString("NewsId")); 
         movie.setDateTime(homenews.getString("DateTime")); 
         movie.setNewsType(homenews.getString("NewsType")); 
         movie.setTitle(homenews.getString("Title")); 
         movie.setDescription(homenews.getString("Description")); 
         movie.setThumbnailUrl(homenews.getString("MainImageThumbnail")); 

         movieList.add(movie); 
         System.out.println("Setting up in ListView"); 
        } 
       } catch (JSONException e) { 
        e.printStackTrace(); 
       } 
       adapter.notifyDataSetChanged(); 
      } 
     }, 

       new Response.ErrorListener() { 
        @Override 
        public void onErrorResponse(VolleyError error) { 
//      new AlertDialog.Builder(getActivity()) 
//        .setTitle("No Connectivity ") 
//        .setMessage("Please check your internet connectivity!") 
//        .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() { 
//         public void onClick(DialogInterface dialog, int which) { 
//          // continue with delete 
//         } 
//        }) 
//          //.setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() { 
//          //public void onClick(DialogInterface dialog, int which) { 
//          // do nothing 
//          //} 
//          //}) 
//        .setIcon(android.R.drawable.ic_dialog_alert) 
//        .show(); 
         hidePDialog(); 
        } 
       })); 

//  AppController.getInstance().addToRequestQueue(jsonObjectRequest); 
//  requestQueue.add(jsonObjectRequest); 
     return rootView; 
    } 

    @Override 
    public void onAttach(Activity activity) { 
     super.onAttach(activity); 
    } 

    @Override 
    public void onDetach() { 
     super.onDetach(); 
    } 

    private void hidePDialog() { 
     if (pDialog != null) { 
      pDialog.dismiss(); 
      pDialog = null; 
     } 
    } 
} 

Answer 1

Ce qui se produit probablement, c'est que les deux fragments sont tous deux chargés même si vous ne regardez qu'un fragment à la fois. Au lieu de créer un nouveau RequestQueue à chaque demande, vous ne devriez en avoir qu'un. Par exemple créer une classe d'application comme ceci:

public class MyApp extends Application { 

    private RequestQueue mRequestQueue; 

    private static MyApp mInstance; 

    @Override 
    public void onCreate() { 
     super.onCreate(); 
     mInstance = this; 
    } 

    public static synchronized MyApp getInstance() { 
     return mInstance; 
    } 

    public RequestQueue getRequestQueue() { 
     if (mRequestQueue == null) { 
     mRequestQueue = Volley.newRequestQueue(getApplicationContext()); 
     } 

     return mRequestQueue; 
    } 

    public <T> void addToRequestQueue(Request<T> req) { 
     req.setTag(TAG); 
     getRequestQueue().add(req); 
    } 
} 

Ne pas oublier d'ajouter votre classe d'application à votre manifeste dans la balise <activity>:

<application 
    android:name=".MyApp" 

Maintenant, vous pouvez mettre des demandes sur cette file d'attente de votre fragments:

JsonObjectRequest req = new JsonObjectRequest(Request.Method.GET, 
      URL, null, new Response.Listener<JSONObject>() { 

     @Override 
     public void onResponse(JSONObject response) { 
      //Do something with response 
     } 
    }, new Response.ErrorListener() { 

     @Override 
     public void onErrorResponse(VolleyError error) { 
      //Do something with error 
     } 
    }); 

    //Put the actual request on the queue 
    MyApp.getInstance().addToRequestQueue(req);