リストビューにオートリフレッシュリストアダプターを追加したい

Question

私はリストビューに設定しているリストアダプターを持っています。リストビューとアダプターを組み合わせるレイアウトが1つあります。このリストに値の自動更新がある可能性はありますか？

はここでまた、私はこの

Fragment mFragment = new VehicleListMapFragment(getActivity(), getActivity()); 
              getFragmentManager().beginTransaction().addToBackStack("sd").replace(R.id.mainLayout, mFragment).commit(); 

は、私はちょうどそのコードを使用してレイアウトを交換しています次のフラグメントに行かなければならない私のコード

class VehicleListFragment extends Fragment { 

    private ProgressDialog pDialog; 
    private ListView lv; 

    public static String baseUrl = "http://mark.journeytech.com.ph/mobile_api/"; 
    public static NetworkAPI networkAPI; 

    public ArrayList<HashMap<String, String>> vehicle = new ArrayList<>(); 
    String a = ""; 

    ArrayList pna; 

    public interface NetworkAPI { 
     @POST("vehicle_details.php") 
     @Headers({"Content-Type:application/json; charset=UTF-8"}) 
     Call<JsonElement> loginRequest(@Body VehicleRequestPojo body); 
    } 

    public static class VehicleRequestPojo { 
     String ucsi_num; 
     String client_table; 
     String markutype; 

     public VehicleRequestPojo(String ucsi_num, String client_table, String markutype) { 
      this.ucsi_num = ucsi_num; 
      this.client_table = client_table; 
      this.markutype = markutype; 
     } 
    } 

    @Override 
    public void onAttach(Context context) { 
     super.onAttach(context); 

     searchItem.setVisible(false); 
    } 

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

     MainActivity csActivity; 
     csActivity = (MainActivity) getActivity(); 
     csActivity.getSupportActionBar().setTitle("Vehicle List"); 

    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     // Inflate the layout for this fragment 
     View v = inflater.inflate(R.layout.fragment_vehicle, container, false); 
     lv = (ListView) v.findViewById(R.id.list); 

     new GetVehicles().execute(); 

     return v; 
    } 

    private class GetVehicles extends AsyncTask<Void, Void, Void> { 

     @Override 
     protected void onPreExecute() { 
      super.onPreExecute(); 

      // Showing progress dialog 
      pDialog = new ProgressDialog(getActivity()); 
      pDialog.setMessage("Please wait..."); 
      pDialog.setCancelable(false); 
      pDialog.show(); 
     } 

     @Override 
     protected Void doInBackground(Void... arg0) { 
      HttpLoggingInterceptor logging = new HttpLoggingInterceptor(); 

      logging.setLevel(HttpLoggingInterceptor.Level.BODY); 
      OkHttpClient.Builder httpClient = new OkHttpClient.Builder(); 

      httpClient.addInterceptor(logging); 
      Retrofit retrofit = new Retrofit.Builder() 
        .baseUrl(baseUrl) 
        .addConverterFactory(GsonConverterFactory.create()) 
        .client(httpClient.build()) 
        .build(); 

      networkAPI = retrofit.create(NetworkAPI.class); 

      VehicleRequestPojo loginRequest = new VehicleRequestPojo(MainActivity.ucsi_num, client_table, markutype); 

      Call<JsonElement> call = networkAPI.loginRequest(loginRequest); 

      call.enqueue(new Callback<JsonElement>() { 
       @Override 
       public void onResponse(Call<JsonElement> call, Response<JsonElement> response) { 
        // success response 
        if (response.body().isJsonArray()) { 
         JsonArray objectWhichYouNeed = response.body().getAsJsonArray(); 
         System.out.println(objectWhichYouNeed); 

         for (int i = 0; i < response.body().getAsJsonArray().size(); i++) { 
          JsonElement je = response.body().getAsJsonArray().get(i); 
          JsonObject jo = je.getAsJsonObject(); 

          String plate_n = jo.get("plate_num").toString(); 
          String plate_nString = plate_n; 
          plate_nString = plate_nString.replace("\"", ""); 
          String plate_num = String.valueOf(plate_nString); 

          String gps_n = jo.get("gps_num").toString(); 
          String gps_nString = gps_n; 
          gps_nString = gps_nString.replace("\"", ""); 
          String gps_num = String.valueOf(gps_nString); 

          String locat = jo.get("location").toString(); 
          String locatString = locat; 
          locatString = locatString.replace("\"", ""); 
          String location = String.valueOf(locatString); 

          String da = jo.get("date").toString(); 
          String daString = da; 
          daString = daString.replace("\"", ""); 
          String date = String.valueOf(daString); 

          String ti = jo.get("time").toString(); 
          String tiString = ti; 
          tiString = tiString.replace("\"", ""); 
          String time = String.valueOf(tiString); 

          String lati = jo.get("lat").toString(); 
          String latiString = lati; 
          latiString = latiString.replace("\"", ""); 
          String lat = String.valueOf(latiString); 

          String longi = jo.get("lng").toString(); 
          String longiString = longi; 
          longiString = longiString.replace("\"", ""); 
          String lng = String.valueOf(longiString); 

          String en = jo.get("engine").toString(); 
          String enString = en; 
          enString = enString.replace("\"", ""); 
          String engine = String.valueOf(enString); 

          String re = jo.get("remarks").toString(); 
          String reString = re; 
          reString = reString.replace("\"", ""); 
          String remarks = String.valueOf(reString); 

          if (lat != null && !lat.equals("null") || (lng != null && !lng.equals("null"))) { 
           // tmp hash map for detail [single] 
           HashMap<String, String> details = new HashMap<>(); 

           // adding each child node to HashMap key => value 
           details.put("plate_num", plate_num); 
           details.put("gps_num", gps_num); 
           details.put("location", location); 
           details.put("date", date); 
           details.put("time", time); 
           details.put("lat", lat); 
           details.put("lng", lng); 
           details.put("engine", engine); 
           details.put("remarks", remarks); 

           a = details.get("date"); 

           // adding vehicle to vehicle list 
           vehicle.add(details); 

           /** 
           * Updating parsed JSON data into ListView 
           * */ 
           final ListAdapter adapter = new SimpleAdapter(getContext(), vehicle, 
             R.layout.list_vehicle, new String[]{"plate_num", 
             "location", "date", "time", "lat", "lng", "engine", 
             "remarks",}, 
             new int[]{R.id.plate_num, R.id.location, R.id.date, R.id.time, R.id.latitude, R.id.longitude, 
               R.id.engine, R.id.remarks}); 

//        lv.setAdapter(adapter); 

           lv.invalidateViews(); 
           lv.refreshDrawableState(); 

           lv.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
            @Override 
            public void onItemClick(AdapterView<?> adapterView, View v, int position, long l) { 

             TextView plate_n = (TextView) v.findViewById(R.id.plate_num); 
             TextView dat = (TextView) v.findViewById(R.id.date); 
             TextView tim = (TextView) v.findViewById(R.id.time); 
             TextView loc = (TextView) v.findViewById(R.id.location); 
             TextView lat = (TextView) v.findViewById(R.id.latitude); 
             TextView lng = (TextView) v.findViewById(R.id.longitude); 
             TextView eng = (TextView) v.findViewById(R.id.engine); 
             TextView rem = (TextView) v.findViewById(R.id.remarks); 

             String plate_num = plate_n.getText().toString(); 
             String date = dat.getText().toString(); 
             String time = tim.getText().toString(); 
             String location = loc.getText().toString(); 
             String latitude = lat.getText().toString(); 
             String longitude = lng.getText().toString(); 
             String engine = eng.getText().toString(); 
             String remarks = rem.getText().toString(); 

             Bundle bundle = new Bundle(); 
             bundle.putString("plate_num", plate_num); 
             bundle.putString("date", date); 
             bundle.putString("time", time); 
             bundle.putString("location", location); 
             bundle.putString("latitude", latitude); 
             bundle.putString("longitude", longitude); 
             bundle.putString("engine", engine); 
             bundle.putString("remarks", remarks); 


             if ((!latitude.equals("") && latitude != null) || (!longitude.equals("") && longitude != null)) { 
              Fragment mFragment = new VehicleListMapFragment(getActivity(), getActivity()); 
              getFragmentManager().beginTransaction().addToBackStack("sd").replace(R.id.mainLayout, mFragment).commit(); 

              mFragment.setArguments(bundle); 
             } else { 
              Toast.makeText(getContext(), "Invalid Data.", Toast.LENGTH_LONG).show(); 
             } 

            } 
           }); 

          } 

         } 

        } else { 
         System.out.println("Not a JSONArray."); 
        } 

       } 


       @Override 
       public void onFailure(Call<JsonElement> call, Throwable t) { 
        // failure response 
        System.out.println(call.toString()); 
       } 

      }); 
      return null; 
     } 

     @Override 
     protected void onPostExecute(Void result) { 
      super.onPostExecute(result); 

      // Dismiss the progress dialog 
      if (pDialog.isShowing()) 
       pDialog.dismiss(); 
     } 
    } 

} 

です。次のフラグメントに移動して戻るボタンを押すたびに、このレイアウトの値が倍になります。あなたはplsできますか？これに解決策を説明してください。答えに感謝しています。

Answer 1

オブジェクトを追加する前に、車両 ArrayListをクリアしてください。あなたはそれがするアダプタを作成している場合

vehicle.clear(); 

そして

、

vehicle.add(details); 

とあなたのListView