我想在Android中将json数据绑定到可扩展列表视图。 显示以下错误
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;
}
}
}
帮助我解决这个问题。
答案 0 :(得分：1)
改变这个：
listAdapter = new ExpandableListAdapter(this,listDataHeader,listDataChild);
到：
listAdapter = new ExpandableListAdapter(MainActivity.this, listDataHeader, listDataChild);