title: Fragment, Volley and RecyclerView
body: <p>I hope someone out there can help me solve my problem. I have android app that have 3 tabs, i use fragment, first tab is recyclerView list, second tabs is map. the problem is in tabs 1, i need to fetch data with volley to recyclerView on tabs 1, if run fine but i cannot see the data on first app start, but when i change tab and back to tab 1 again it will refresh the data and show the data on recyclerView. </p>
  
  <p>Adapter.java</p>
  
  <pre><code>public class CustomListAdapterWarkop extends RecyclerView.Adapter&lt;RecyclerView.ViewHolder&gt; {
  
      private Context context;
      private List&lt;Warkop&gt; mWarkop;
      private LayoutInflater inflater;
  
  
      public CustomListAdapterWarkop(Context context, List&lt;Warkop&gt; mWarkop) {
          this.context=context;
          inflater= LayoutInflater.from(context);
          this.mWarkop = mWarkop;
      }
  
      @Override
      public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
          View view = inflater.inflate(R.layout.list_warkop_row, parent, false);
          ItemViewHolder holder = new ItemViewHolder(view);
  
          return holder;
      }
  
      @Override
      public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
          ItemViewHolder viewHolder = (ItemViewHolder) holder;
          Warkop current = mWarkop.get(position);
  
          viewHolder.tvNamaWarkop.setText(current.getNamaWarkop());
  
  
          ImageLoader imageLoader = ImageLoader.getInstance();
          DisplayImageOptions options = new DisplayImageOptions.Builder().cacheInMemory(true)
                  .cacheOnDisc(true).resetViewBeforeLoading(true)
                  .showImageForEmptyUri(R.drawable.noimage)
                  .showImageOnFail(R.drawable.noimage)
                  .showImageOnLoading(R.drawable.noimage).build();
          imageLoader.displayImage(current.getFotoWarkop(), viewHolder.ivFotoWarkop, options);
  
      }
  
      @Override
      public int getItemCount() {
          return mWarkop.size();
      }
  
  }
  </code></pre>
  
  <p>ItemHolder.java</p>
  
  <pre><code>package com.andylah.warkopedia;
  
  import android.support.v7.widget.RecyclerView;
  import android.view.View;
  import android.widget.ImageView;
  import android.widget.TextView;
  
  /**
   * Created by andylah on 11/3/2017.
   */
  
  public class ItemViewHolder extends RecyclerView.ViewHolder {
  
      public ImageView ivFotoWarkop;
      public TextView tvNamaWarkop;
  
      public ItemViewHolder(View itemView) {
          super(itemView);
  
          tvNamaWarkop = itemView.findViewById(R.id.nama_warkop);
          ivFotoWarkop = itemView.findViewById(R.id.image_warkop);
  
      }
  }
  </code></pre>
  
  <p>Tab 1.java</p>
  
  <pre><code>public class tabSatu extends Fragment {
  
      private static final String TAG = tabDua.class.getSimpleName();
      public static final int CONNECTION_TIMEOUT = 10000;
      public static final int READ_TIMEOUT = 15000;
      private boolean isFragmentLoaded = false;
      View vTabSatu;
      private RecyclerView recyclerView;
      public static List&lt;Warkop&gt; warkopList = new ArrayList&lt;Warkop&gt;();
      private CustomListAdapterWarkop warkopAdapter;
  
      public tabSatu(){
  
      }
  
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
  
      }
  
      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container,
                               Bundle savedInstanceState) {
  
          new AsyncFetch().execute();
  
          vTabSatu = inflater.inflate(R.layout.tabsatu_view, container, false);
  
          recyclerView = vTabSatu.findViewById(R.id.warkop_container);
  
          LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
  
          recyclerView.setLayoutManager(layoutManager);
  
          Log.d("LOG : ", "onCreatedView Run");
  
          // Inflate the layout for this fragment
          return vTabSatu;
      }
  
      @Override
      public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
          super.onViewCreated(view, savedInstanceState);
  
          warkopAdapter = new CustomListAdapterWarkop(getActivity(), warkopList);
  
          warkopAdapter.notifyDataSetChanged();
  
          recyclerView.setAdapter(warkopAdapter);
  
          Log.d("LOG : ", "onViewCreated Run");
      }
  
      @Override
      public void setUserVisibleHint(boolean isVisibleToUser) {
          super.setUserVisibleHint(isVisibleToUser);
          if (isVisibleToUser &amp;&amp; !isFragmentLoaded ) {
              // Load your data here or do network operations here
              isFragmentLoaded = true;
              //new AsyncFetch().execute();
          }else{
              isFragmentLoaded = false;
  
  
              Log.d("LOG : ", "isFragmentLoaded = false");
          }
      }
  
      private class AsyncFetch extends AsyncTask&lt;String, String, String&gt; {
  
          ProgressDialog pDialog = new ProgressDialog(getActivity());
  
          HttpURLConnection conn;
          URL url = null;
  
          @Override
          protected void onPreExecute() {
              super.onPreExecute();
  
              pDialog.setMessage("Loading list warkop ...");
              pDialog.setCancelable(false);
              pDialog.show();
          }
  
          @Override
          protected String doInBackground(String... strings) {
              try {
  
                  // Enter URL address where your json file resides
                  // Even you can make call to php file which returns json data
                  url = new URL(AppConfig.LOAD_WARKOP);
  
              } catch (MalformedURLException e) {
                  // TODO Auto-generated catch block
                  e.printStackTrace();
                  return e.toString();
              }
              try {
  
                  // Setup HttpURLConnection class to send and receive data from php and mysql
                  conn = (HttpURLConnection) url.openConnection();
                  conn.setReadTimeout(READ_TIMEOUT);
                  conn.setConnectTimeout(CONNECTION_TIMEOUT);
                  conn.setRequestMethod("POST");
  
                  // setDoOutput to true as we recieve data from json file
                  conn.setDoOutput(true);
  
              } catch (IOException e1) {
                  // TODO Auto-generated catch block
                  e1.printStackTrace();
                  return e1.toString();
              }
              try {
  
                  int response_code = conn.getResponseCode();
  
                  // Check if successful connection made
                  if (response_code == HttpURLConnection.HTTP_OK) {
  
                      // Read data sent from server
                      InputStream input = conn.getInputStream();
                      BufferedReader reader = new BufferedReader(new InputStreamReader(input));
                      StringBuilder result = new StringBuilder();
                      String line;
  
                      while ((line = reader.readLine()) != null) {
                          result.append(line);
                      }
  
                      // Pass data to onPostExecute method
                      return (result.toString());
  
                  } else {
  
                      return ("unsuccessful");
                  }
  
              } catch (IOException e) {
                  e.printStackTrace();
                  return e.toString();
              } finally {
                  conn.disconnect();
              }
          }
  
          @Override
          protected void onPostExecute(String result) {
              pDialog.dismiss();
  
              try{
                  JSONObject object = new JSONObject(result);
                  String getObject = object.getString("warkop");
                  JSONArray jsonArray = new JSONArray(getObject);
                  boolean error = object.getBoolean("error");
  
                  if(!error){
                      for (int i = 0; i &lt; jsonArray.length(); i++) {
                          JSONObject jsonObject = jsonArray.getJSONObject(i);
  
                          Warkop warkop = new Warkop();
  
                          warkop.setNamaWarkop(jsonObject.getString("nama_warkop"));
                          warkop.setAlamatWrkop(jsonObject.getString("alamat_warkop"));
                          warkop.setKotaWarkop(jsonObject.getString("kota_warkop"));
                          warkop.setLatWarkop(Double.parseDouble(jsonObject.getString("lat_warkop")));
                          warkop.setLangWarkop(Double.parseDouble(jsonObject.getString("long_warkop")));
                          warkop.setIsWifi(Integer.parseInt(jsonObject.getString("is_wifi")));
                          warkop.setIsToilet(Integer.parseInt(jsonObject.getString("is_toilet")));
                          warkop.setIsTv(Integer.parseInt(jsonObject.getString("is_tv")));
                          warkop.setIsColokan(Integer.parseInt(jsonObject.getString("is_colokan")));
                          warkop.setIsParkir(Integer.parseInt(jsonObject.getString("is_parkir")));
                          warkop.setFotoWarkop(jsonObject.getString("foto_warkop"));
  
                          warkopList.add(warkop);
                      }
                  }else{
                      String errorMsg = object.getString("error_msg");
                      Toast.makeText(getContext(),
                              errorMsg, Toast.LENGTH_LONG).show();
                  }
  
              }catch (JSONException e) {
  
                  e.printStackTrace();
                  Toast.makeText(getActivity(), "Json error: " + e.getMessage(), Toast.LENGTH_LONG).show();
              }
  
          }
      }
  
  }
  </code></pre>