[英]Value connected of type java.lang.string cannot be converted to jsonobject [Android Volley Library]
[英]Value Connected of type java.lang.String cannot be converted to JSONObject
我有一个 PHP 文件,当我运行它时,它会从数据库中获取所有员工,以 JSON 格式访问所有员工。
Android Studio 中的此代码通过 php 文件从数据库中获取所有员工
当我运行应用程序时,我没有在 Android Studio 中获取数据。
它返回此错误:
java.lang.String 类型的值 Connected 无法转换为 JSONObject
在图像中
这是 Android Studio 中的 Java 代码:
package com.example.ibrahim.samplecrud;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.HashMap;
public class ViewAllEmployee extends AppCompatActivity implements ListView.OnItemClickListener {
private ListView listView;
private String JSON_STRING;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_all_employee);
listView = (ListView) findViewById(R.id.listView);
listView.setOnItemClickListener(this);
getJSON();
}
private void showEmployee(){
JSONObject jsonObject = null;
ArrayList<HashMap<String,String>> list = new ArrayList<HashMap<String, String>>();
try {
jsonObject = new JSONObject(JSON_STRING);
JSONArray result = jsonObject.getJSONArray(Config.TAG_JSON_ARRAY);
for(int i = 0; i<result.length(); i++){
JSONObject jo = result.getJSONObject(i);
String id = jo.getString(Config.TAG_ID);
String name = jo.getString(Config.TAG_NAME);
HashMap<String,String> employees = new HashMap<>();
employees.put(Config.TAG_ID,id);
employees.put(Config.TAG_NAME,name);
list.add(employees);
}
} catch (JSONException e) {
e.printStackTrace();
}
ListAdapter adapter = new SimpleAdapter(
ViewAllEmployee.this, list, R.layout.list_item,
new String[]{Config.TAG_ID,Config.TAG_NAME},
new int[]{R.id.id, R.id.name});
listView.setAdapter(adapter);
}
private void getJSON(){
class GetJSON extends AsyncTask<Void,Void,String>{
ProgressDialog loading;
@Override
protected void onPreExecute() {
super.onPreExecute();
loading = ProgressDialog.show(ViewAllEmployee.this,"Fetching Data","Wait...",false,false);
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
loading.dismiss();
JSON_STRING = s;
showEmployee();
}
@Override
protected String doInBackground(Void... params) {
RequestHandler rh = new RequestHandler();
String s = rh.sendGetRequest(Config.URL_GET_ALL);
return s;
}
}
GetJSON gj = new GetJSON();
gj.execute();
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent intent = new Intent(this, ViewEmployee.class);
HashMap<String,String> map =(HashMap)parent.getItemAtPosition(position);
String empId = map.get(Config.TAG_ID).toString();
intent.putExtra(Config.EMP_ID,empId);
startActivity(intent);
}
}
目前,您从服务器接收的String
是
Connection sucessful{"result":[{"id":2,"name":A"},{"id","pop"},...]}
它不是有效的 JSON 格式
因此,您应该编辑服务器代码以返回正确的 JSON 格式,例如
{"result":[{"id":2,"name":A"},{"id","pop"},...]}
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