adapter.notifyDataSetChanged（）not working

Question

私はこのコードを書いています。どういうわけか、notifyDatasetChangedを私のアダプタに呼び出すと動作しません。誰も私がなぜこれがうまくいかないのか説明できませんでしたか？

の作成時に私は別の質問がありますが、私はこれを別の方法で行うことができます。なぜなら、私がこれを行うとき、Spinnerの最初の項目を選択できないからです。

package com.example.sander.app; 

import android.app.Fragment; 
import android.app.FragmentManager; 
import android.app.FragmentTransaction; 
import android.content.Context; 
import android.location.Location; 
import android.os.Bundle; 
import android.support.v7.widget.LinearLayoutManager; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.AdapterView; 
import android.widget.ArrayAdapter; 
import android.widget.LinearLayout; 
import android.widget.Spinner; 

import com.android.volley.Request; 
import com.android.volley.RequestQueue; 
import com.android.volley.Response; 
import com.android.volley.VolleyError; 
import com.android.volley.toolbox.StringRequest; 
import com.android.volley.toolbox.Volley; 
import com.jjoe64.graphview.GraphView; 
import com.jjoe64.graphview.LegendRenderer; 
import com.jjoe64.graphview.helper.StaticLabelsFormatter; 
import com.jjoe64.graphview.series.BarGraphSeries; 
import com.jjoe64.graphview.series.DataPoint; 
import com.jjoe64.graphview.series.DataPointInterface; 
import com.jjoe64.graphview.series.LineGraphSeries; 
import com.jjoe64.graphview.series.OnDataPointTapListener; 
import com.jjoe64.graphview.series.Series; 

import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import java.util.ArrayList; 
import android.R.layout.*; 
import android.widget.Toast; 

/** 
* Created by Sander on 8-4-2017. 
*/ 

public class GraphFrame extends Fragment implements AdapterView.OnItemSelectedListener { 
    Integer hoodSelector = 27; 
    ArrayList<HoodData> hoodDataList = new ArrayList<>(); 
    ArrayList<String> hoodList = new ArrayList<>(); 

    Context mContext; 

    @Override 
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { 

    } 

    @Override 
    public void onNothingSelected(AdapterView<?> parent) { 

    } 
    public void refreshFragment(){ 
     hoodDataList.clear(); 
     FragmentTransaction transaction = getFragmentManager().beginTransaction(); 
     transaction.detach(this).attach(this).commit(); 
    } 
    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     final View view = inflater.inflate(R.layout.fragment_graph, 
       container, false); 
     //API Request for all the hoods 

     getDataFromApi((GraphView) view.findViewById(R.id.graph)); 
     getDataForSpinner((Spinner) view.findViewById(R.id.spinner)); 
     return view; 
    } 

    public void setHoodId(Integer hood){ 
     hoodSelector = hood; 
    } 



    public void getDataFromApi(final GraphView graph) { 
     RequestQueue rq = Volley.newRequestQueue(getActivity().getApplicationContext()); 
     String url= "http://test.dontstealmywag.ga/api/damage_or_theft_car_wijk.php?hood_id=" + hoodSelector; 
     StringRequest stringRequest = new StringRequest(Request.Method.GET, url, 
       new Response.Listener<String>() { 
        @Override 
        public void onResponse(String response) { 
         // Do something with the response 
         try{ 
          JSONObject o = new JSONObject(response); 
          JSONArray values=o.getJSONArray(""); 
          for (int i = 0; i < values.length(); i++) { 
           JSONObject jsonObject = values.getJSONObject(i); 
           hoodDataList.add(new HoodData(jsonObject.getDouble("percentage"), jsonObject.getInt("hood_id"), jsonObject.getInt("year"), jsonObject.getString("hood_name"))); 
          } 

         } catch (JSONException ex){} 
         StaticLabelsFormatter staticLabelsFormatter = new StaticLabelsFormatter(graph); 

         LineGraphSeries<DataPoint> series = new LineGraphSeries<>(new DataPoint[] { 
           new DataPoint(1, hoodDataList.get(0).getPercentage()), 
           new DataPoint(2, hoodDataList.get(1).getPercentage()), 
           new DataPoint(3, hoodDataList.get(2).getPercentage()), 
           new DataPoint(4, hoodDataList.get(3).getPercentage()), 
           new DataPoint(5, hoodDataList.get(4).getPercentage()) 
           //new DataPoint(12, 0) 
         }); 

         // set manual x bounds 
         staticLabelsFormatter.setHorizontalLabels(new String[] {"2006", "2007","2008","2009","2011"}); 
         //creates custom x-axis 
         graph.getGridLabelRenderer().setLabelFormatter(staticLabelsFormatter); 
         graph.setTitle("Wijk " + hoodSelector + " - " + hoodDataList.get(0).getHood_name()); 
         //set nice background color :) 
         series.setDrawBackground(true); 
         //shows points at datapoints 
         series.setDrawDataPoints(true); 
         //size of the points 
         series.setDataPointsRadius(10.0f); 
         series.setOnDataPointTapListener(new OnDataPointTapListener() { 
          @Override 
          public void onTap(Series series, DataPointInterface dataPoint) { 
           Toast.makeText(getActivity(), "Punt "+ dataPoint, Toast.LENGTH_SHORT).show(); 
          } 
         }); 
         series.setTitle("%"); 
         series.setAnimated(true); 
         graph.getLegendRenderer().setVisible(true); 
         graph.getLegendRenderer().setAlign(LegendRenderer.LegendAlign.TOP); 
         graph.addSeries(series); 



        } 
       }, 
       new Response.ErrorListener() { 
        @Override 
        public void onErrorResponse(VolleyError error) { 
         // Handle error 
        } 
       }); 


     rq.add(stringRequest); 
    } 
    public void getDataForSpinner(final Spinner spinner){ 
     RequestQueue rq = Volley.newRequestQueue(getActivity().getApplicationContext()); 
     String url= "http://test.dontstealmywag.ga/api/damage_or_theft_car_wijk.php"; 
     StringRequest stringRequest = new StringRequest(Request.Method.GET, url, 
       new Response.Listener<String>() { 
        @Override 
        public void onResponse(String response) { 
         // Do something with the response 

         try{ 
          JSONObject o = new JSONObject(response); 
          JSONArray values=o.getJSONArray(""); 
          for (int i = 0; i < values.length(); i++) { 
           JSONObject jsonObject = values.getJSONObject(i); 
           if (!hoodList.contains(jsonObject.getString("hood_name"))) { 
            hoodList.add(jsonObject.getString("hood_name")); 
           } 
          } 
         } catch (JSONException ex){} 

         final ArrayAdapter<String> adapter = new ArrayAdapter<String>(spinner.getContext(), android.R.layout.simple_spinner_item, hoodList); 
         // Specify the layout to use when the list of choices appears 
         adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
         // Apply the adapter to the spinner 
         spinner.setPrompt("Title"); 
         spinner.setAdapter(adapter); 

         spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
          @Override 
          public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { 
           String item = parent.getItemAtPosition(position).toString(); 
           // Showing selected spinner item 
           for(int i = 1; i < hoodList.size(); i++) { 
            if (item.equals(hoodList.get(i))) { 
             setHoodId(i + 27); 
             adapter.notifyDataSetChanged(); 
            } 
           } 
          } 

          @Override 
          public void onNothingSelected(AdapterView<?> parent) { 

          } 
         }); 


        } 
       }, 
       new Response.ErrorListener() { 
        @Override 
        public void onErrorResponse(VolleyError error) { 
         // Handle error 
        } 
       }); 


     rq.add(stringRequest); 
    } 


} 

Answer 1

宣言

private GraphView mGraphView; private Spinner mSpinner; private ArrayAdapter<String> adapter;

そして方法getDataFromApiとgetDataForSpinnerでパラメータを削除します。

代わりadapter.notifyDataSetChanged();

のリコールgetDataFromApiあなたはadapter.notifyItemChanged（位置）を試すことができgetDataFromApi