如何在扩展列表视图中绑定Json数据？

Question

我想在Android中将json数据绑定到可扩展列表视图。 所示

错误以下错误：

Error:(175, 65) error: incompatible types: MainActivity.ExecuteTask cannot be converted to Context 

JSON数据：

[{"PART_ID":"01684.021","SHIFT_DATE":"20-SEP-17","PLAN_QTY":"2","ACTUAL_QTY":"2"}, 
{"PART_ID":"0346001.020","SHIFT_DATE":"20-SEP-17","PLAN_QTY":"4","ACTUAL_QTY":"4"}, 
{"PART_ID":"01068.021","SHIFT_DATE":"20-SEP-17","PLAN_QTY":"7","ACTUAL_QTY":"7"}] 

ExpandableListAdapter.java

package com.example.saravanakumars.expandable_listview; 

import android.content.Context; 
import android.graphics.Typeface; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseExpandableListAdapter; 
import android.widget.TextView; 
import java.util.HashMap; 
import java.util.List; 
/** 
* Created by saravanakumars on 10/3/2017. 
*/ 

public class ExpandableListAdapter extends BaseExpandableListAdapter { 
    private Context _context; 
    private List<String> _listDataHeader; // header titles 
    // child data in format of header title, child title 
    private HashMap<String, List<String>> _listDataChild; 

// ArrayList<TerbaruModel>ListTerbaru; 
// ArrayList<ArrayList<ChildTerbaru>> ListChildTerbaru; 
// int count; 
    public ExpandableListAdapter(Context context, List<String> listDataHeader, 
           HashMap<String, List<String>> listChildData) { 
     this._context = context; 
     this._listDataHeader = listDataHeader; 
     this._listDataChild = listChildData; 
    } 

    @Override 
    public Object getChild(int groupPosition, int childPosititon) { 
     return this._listDataChild.get(this._listDataHeader.get(groupPosition)) 
       .get(childPosititon); 
    } 

    @Override 
    public long getChildId(int groupPosition, int childPosition) { 
     return childPosition; 
    } 

    @Override 
    public View getChildView(int groupPosition, final int childPosition, 
          boolean isLastChild, View convertView, ViewGroup parent) { 

     final String childText = (String) getChild(groupPosition, childPosition); 

     if (convertView == null) { 
      LayoutInflater infalInflater = (LayoutInflater) this._context 
        .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      convertView = infalInflater.inflate(R.layout.list_item, null); 
     } 

     TextView txtListChild = (TextView) convertView 
       .findViewById(R.id.lblListItem); 

     txtListChild.setText(childText); 
     return convertView; 
    } 

    @Override 
    public int getChildrenCount(int groupPosition) { 
     return this._listDataChild.get(this._listDataHeader.get(groupPosition)) 
       .size(); 
    } 

    @Override 
    public Object getGroup(int groupPosition) { 
     return this._listDataHeader.get(groupPosition); 
    } 

    @Override 
    public int getGroupCount() { 
     return this._listDataHeader.size(); 
    } 

    @Override 
    public long getGroupId(int groupPosition) { 
     return groupPosition; 
    } 

    @Override 
    public View getGroupView(int groupPosition, boolean isExpanded, 
          View convertView, ViewGroup parent) { 
     String headerTitle = (String) getGroup(groupPosition); 
     if (convertView == null) { 
      LayoutInflater infalInflater = (LayoutInflater) this._context 
        .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      convertView = infalInflater.inflate(R.layout.list_group, null); 
     } 

     TextView lblListHeader = (TextView) convertView 
       .findViewById(R.id.lblListHeader); 
     lblListHeader.setTypeface(null, Typeface.BOLD); 
     lblListHeader.setText(headerTitle); 

     return convertView; 
    } 

    @Override 
    public boolean hasStableIds() { 
     return false; 
    } 

    @Override 
    public boolean isChildSelectable(int groupPosition, int childPosition) { 
     return true; 
    } 
} 

MainActivity.java

package com.example.saravanakumars.expandable_listview; 

import android.app.ProgressDialog; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.widget.ExpandableListView; 

import org.apache.http.HttpEntity; 
import org.apache.http.HttpResponse; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.entity.UrlEncodedFormEntity; 
import org.apache.http.client.methods.HttpPost; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.apache.http.message.BasicNameValuePair; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import java.io.BufferedReader; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 

public class MainActivity extends AppCompatActivity{ 

    ExpandableListAdapter listAdapter; 
    ExpandableListView expListView; 
    List<String> listDataHeader; 
    HashMap<String, List<String>> listDataChild; 


    String s1 = "CLASIFICACION"; 
    String s2 = "ONE PIECE"; 
    String s3 = "159-OP SHERIDAN"; 


    private String TAG = MainActivity.class.getSimpleName(); 
    private ProgressDialog pDialog; 
    private static String url = "http://113.193.30.155/MobileService/MobileService.asmx/GetPartbyProcessFamilyModel"; 

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

//  expListView = (ExpandableListView) findViewById(R.id.lvExp); 
// 
//  // preparing list data 
//  prepareListData(); 
// 
//  listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild); 
// 
//  // setting list adapter 
//  expListView.setAdapter(listAdapter); 


     new ExecuteTask().execute(s1, s2, s3); 


    } 

    /* 
    * Preparing the list data 
//  */ 
// private void prepareListData() { 
//  listDataHeader = new ArrayList<String>(); 
//  listDataChild = new HashMap<String, List<String>>(); 
// 
//  // Adding child data 
//  listDataHeader.add("Defect"); 
//  listDataHeader.add("Production"); 
//  listDataHeader.add("Report"); 
// 
//  // Adding child data 
//  List<String> Defect = new ArrayList<String>(); 
//  Defect.add("Defect-1"); 
//  Defect.add("Defect-2"); 
//  Defect.add("Defect-3"); 
//  Defect.add("Defect-4"); 
//  Defect.add("Defect-5"); 
// 
// 
//  List<String> Production = new ArrayList<String>(); 
//  Production.add("Production-1"); 
//  Production.add("Production-2"); 
//  Production.add("Production-3"); 
//  Production.add("Production-4"); 
//  Production.add("Production-5"); 
// 
// 
//  List<String> Report = new ArrayList<String>(); 
//  Report.add("Report-1"); 
//  Report.add("Report-2"); 
//  Report.add("Report-3"); 
//  Report.add("Report-4"); 
//  Report.add("Report-5"); 
// 
//  listDataChild.put(listDataHeader.get(0), Defect); // Header, Child data 
//  listDataChild.put(listDataHeader.get(1), Production); 
//  listDataChild.put(listDataHeader.get(2), Report); 
// } 

    class ExecuteTask extends AsyncTask<String, Integer, String> { 

     @Override 
     protected String doInBackground(String... params) { 

      String res = PostData(params); 

      return res; 

     } 

     @Override 
     protected void onPostExecute(String result) { 
      super.onPostExecute(result); 
//    Toast.makeText(getApplicationContext(), 
//      result,Toast.LENGTH_LONG) 
//      .show(); 

      fetchResponse(result.replace("\n", "").trim()); 
      pDialog.dismiss(); 

     } 

     private void fetchResponse(String result) { 
      if (!result.equals("")) { 
       try { 
        JSONArray jsonArray = new JSONArray(result); 

        expListView = (ExpandableListView) findViewById(R.id.lvExp); 

        listDataHeader = new ArrayList<String>(); 
        listDataChild = new HashMap<String, List<String>>(); 

        // Adding child data 
        listDataHeader.add("SHIFT_DATE"); 
        listDataHeader.add("PART_ID"); 
        listDataHeader.add("PLAN_QTY"); 

        // Adding child data 
        List<String> SHIFT_DATE = new ArrayList<String>(); 
        for (int i = 0; i < jsonArray.length(); i++) { 

         JSONObject jsonObject = jsonArray.getJSONObject(i); 
         jsonObject = jsonArray.getJSONObject(i); 
         SHIFT_DATE.add(jsonObject.getString("SHIFT_DATE")); 
        } 

        List<String> PART_ID = new ArrayList<String>(); 
        for (int i = 0; i < jsonArray.length(); i++) { 

         JSONObject jsonObject1 = jsonArray.getJSONObject(i); 
         jsonObject1 = jsonArray.getJSONObject(i); 
         PART_ID.add(jsonObject1.getString("PART_ID")); 
        } 


        List<String> PLAN_QTY = new ArrayList<String>(); 
        for (int i = 0; i < jsonArray.length(); i++) { 

         JSONObject jsonObject2 = jsonArray.getJSONObject(i); 
         jsonObject2 = jsonArray.getJSONObject(i); 
         PLAN_QTY.add(jsonObject2.getString("PLAN_QTY")); 
        } 

        listDataChild.put(listDataHeader.get(0), SHIFT_DATE); // Header, Child data 
        listDataChild.put(listDataHeader.get(1), PART_ID); 
        listDataChild.put(listDataHeader.get(2), PLAN_QTY); 

// 
         listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild); 

        // setting list adapter 
        expListView.setAdapter(listAdapter); 

       } catch (JSONException e) { 
        e.printStackTrace(); 
       } 
      } 
     } 


     public String PostData(String[] valuse) { 
      String s = ""; 
      try { 
       HttpClient httpClient = new DefaultHttpClient(); 
       HttpPost httpPost = new HttpPost("http://113.193.30.155/MobileService/MobileService.asmx/GetPartbyProcessFamilyModel"); 

       List<BasicNameValuePair> list = new ArrayList<BasicNameValuePair>(); 
       list.add(new BasicNameValuePair("strProcess", s1)); 
       list.add(new BasicNameValuePair("strFamily", s2)); 
       list.add(new BasicNameValuePair("strModel", s3)); 
       httpPost.setEntity(new UrlEncodedFormEntity(list)); 
       HttpResponse httpResponse = httpClient.execute(httpPost); 

       HttpEntity httpEntity = httpResponse.getEntity(); 

       s = readResponse(httpResponse); 

//   HttpEntity entity = httpResponse.getEntity(); 
// 
//   s = EntityUtils.toString(entity); 

      } catch (Exception exception) { 
      } 
      return s; 


     } 

     public String readResponse(HttpResponse res) { 
      InputStream is = null; 
      String return_text = ""; 
      try { 
       is = res.getEntity().getContent(); 
       BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(is)); 
       String line = ""; 
       StringBuffer sb = new StringBuffer(); 
       while ((line = bufferedReader.readLine()) != null) { 
        sb.append(line); 
       } 
       return_text = sb.toString(); 
      } catch (Exception e) { 

      } 
      return return_text; 

     } 

    } 
} 

帮我解决这个问题。

Answer 1

更改此：

listAdapter = new ExpandableListAdapter(this,listDataHeader,listDataChild); 

到：

listAdapter = new ExpandableListAdapter(MainActivity.this, listDataHeader, listDataChild);