JSONException：其中;串GT;不能转换为JSONObject的使用JSON阵列的帮助 [英] JSONException:<String>cannot be converted to JSONObject with helps of JSON Array

问题描述

  

$ 错误 :: JSONException：JSON字符串不能转换为
  JSONObject的与帮助JSON阵列

这是导入库

 进口java.io.BufferedReader中;
进口java.io.IOException异常;
进口的java.io.InputStream;
进口java.io.InputStreamReader中;
进口的java.util.ArrayList;
进口的java.util.HashMap;
进口的java.util.Map;进口org.apache.http.Htt presponse;
进口org.apache.http.client.ClientProtocolException;
进口org.apache.http.client.HttpClient;
进口org.apache.http.client.methods.HttpPost;
进口org.apache.http.impl.client.DefaultHttpClient;
进口org.json.JSONArray;
进口org.json.JSONException;
进口org.json.JSONObject;进口android.os.AsyncTask;
进口android.os.Bundle;
进口android.annotation.Sup pressLint;
进口android.app.Activity;
进口android.util.Log;
进口android.view.Menu;
进口android.widget.ListView;
进口android.widget.SimpleAdapter;
进口android.widget.Toast;
 

activity_main.xml中文件

 ＆LT;的RelativeLayout的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    的xmlns：工具=htt​​p://schemas.android.com/tool​​s
    机器人：layout_width =match_parent
    机器人：layout_height =match_parent
    机器人：paddingBottom会=@扪/ activity_vertical_margin
    机器人：paddingLeft =@扪/ activity_horizo​​ntal_margin
    机器人：paddingRight =@扪/ activity_horizo​​ntal_margin
    机器人：paddingTop =@扪/ activity_vertical_margin
    工具：上下文=MainActivity。＆GT;＆LT; ListView控件
    机器人：ID =@ + ID / ListView1的
    机器人：layout_width =match_parent
    机器人：layout_height =WRAP_CONTENT
    机器人：layout_alignParentTop =真
    机器人：layout_centerHorizo​​ntal =真
    机器人：layout_marginTop =14dp＆GT;
＆LT; /＆的ListView GT;
 

Internet权限是这里

 ＆LT;使用许可权的android：NAME =android.permission.INTERNET对/＆GT;
 

错误请给我答案如何获得多个值使用这种code，并显示到我的ListView

这是我MainActivity.java类文件。

 公共类MainActivity扩展活动
{
    私人字符串jsonResult;
    私人字符串URL =YOUR_PHP_FILE_URL;
    私人的ListView ListView的;
    @覆盖
    保护无效的onCreate（捆绑savedInstanceState）
    {
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.activity_main）;
        ListView控件=（ListView控件）findViewById（R.id.listView1）;
        accessWebService（）;
     }     @覆盖
     公共布尔onCreateOptionsMenu（菜单菜单）
     {
          //充气菜单;如果是present这增加了项目操作栏。
          。getMenuInflater（）膨胀（R.menu.main，菜单）;
          返回true;
     }     //异步任务访问Web
     @燮pressLint（NewApi）
    私有类JsonReadTask扩展的AsyncTask＆LT;弦乐，太虚，字符串＆GT;
     {
         @覆盖
         保护字符串doInBackground（字符串... PARAMS）
         {
             HttpClient的HttpClient的=新DefaultHttpClient（）;
             HttpPost httppost =新HttpPost（PARAMS [0]）;
             尝试
             {
                 HTT presponse响应= httpclient.execute（httppost）;
                 。jsonResult = inputStreamToString（response.getEntity（）的getContent（））的toString（）;
             }
             赶上（ClientProtocolException E）
             {
                 e.printStackTrace（）;
             }
             赶上（IOException异常E）
             {
                 e.printStackTrace（）;
             }
             返回null;
         }         私人的StringBuilder inputStreamToString（InputStream为）
         {
             串rLine =;
             StringBuilder的答案=新的StringBuilder（）;
             RD的BufferedReader =新的BufferedReader（新的InputStreamReader（是））;             尝试
             {
                 而（（rLine = rd.readLine（））！= NULL）
                 {
                     answer.append（rLine）;
                     Log.d（answer.toString（），字符串生成器类的中频环）;
                 }
             }
             赶上（IOException异常E）
             {
                 // e.printStackTrace（）;
                 Toast.makeText（getApplicationContext（），错误...+ e.toString（），Toast.LENGTH_LONG）.show（）;
                 Log.d（answer.toString（），字符串生成器类中的其他部分）;
             }
             返回的答案;
         }         @覆盖
         保护无效onPostExecute（字符串结果）
         {
             ListDrwaer（）;
         }
     } //结束异步任务     公共无效accessWebService（）
     {
         JsonReadTask任务=新JsonReadTask（）;
          //通行证的URL字符串数组值
          task.execute（新的String [] {URL}）;
     }     //建立列表视图哈希集合
     公众和LT; jsonResult＆GT;无效ListDrwaer（）
     {
         ArrayList的＆LT;地图＆LT;字符串，字符串＆GT;＆GT;用户列表=新的ArrayList＆LT;地图＆LT;字符串，字符串＆GT;＆GT;（）;
         Log.d（userList.toString（）启动的JSONObject）;         尝试
         {
             Log.d（启动试块，以前的JSONObject）;             JSONObject的jsonResponse =新的JSONObject（jsonResult）;
             JSONArray jsonMainNode = jsonResponse.getJSONArray（USER_INFO）;             Log.d（jsonMainNode.toString（）启动的JSONObject）;             的for（int i = 0; I＆LT; jsonMainNode.length（）;我++）
             {
                 JSONObject的jsonChildNode = jsonMainNode.getJSONObject（I）
                 字符串ID = jsonChildNode.optString（ID）;
                 字符串名称= jsonChildNode.optString（姓名：）;
                 字符串email = jsonChildNode.optString（电子邮件：）;
                 字符串手机= jsonChildNode.optString（手机）;
                 字符串密码= jsonChildNode.optString（密码）;
                 字符串输出= ID + - +姓名+ - +电子邮件+ - +手机+ - +密码;
                 userList.add（在CreateEmployee（USER_INFO，输出））;
                 Log.d（jsonChildNode.toString（）内启动的JSONObject For循环）;
             }
         }
         赶上（JSONException E）
         {
             Toast.makeText（getApplicationContext（），错误+ e.toString（），Toast.LENGTH_SHORT）.show（）;
             Log.e（log_tag，失败的数据：\\ n+ jsonResult）;
         }         SimpleAdapter simpleAdapter =新SimpleAdapter（这一点，用户列表，android.R.layout.simple_list_item_1，新的String [] {USER_INFO}，新的INT [] {android.R.id.text1}）;
         listView.setAdapter（simpleAdapter）;
     }     私人的HashMap＆LT;字符串，字符串＆GT;在CreateEmployee（字符串名称，串号）
     {
      HashMap的＆LT;字符串，字符串＆GT; employeeNameNo =新的HashMap＆LT;字符串，字符串＆GT;（）;
      employeeNameNo.put（姓名，号码）;
      返回employeeNameNo;
     }
}
 

解决方案

确定你所得到的错误是很普通的，错误本身会告诉你在做什么错

  

$错误:: JSONException：JSON字符串不能转换为JSONObject的使用JSON阵列的帮助，

我相信你在JSON数据串，伪数据，因为它是在你试图读出双引号中的 JSONObject的。
这不是一个的JSONObject 但字符串基本类型，

在解析 JSON 你需要发挥注意什么是对象，阵列和基本型

 的JSONObject
 

总是会在封闭式{} 所以这次再presents一个括号内的数据是一个JSONObject，
例如===>

  JSONObject的JSON = jsonArray.getJSONObject（I）
 

或

  JSONObject的JSON =新的JSONObject（JSON数据）;
JSONArray
 

将始终放在 [] 所以这次再presents一个方括号内的数据是一个JSONArray，
例如==>`json.getJSONArray（jsonArray的名字）;

 原始型
 

布尔想这

 isSelected：真
要么
isSelected：假的
 

整数想这

 someInt：12
 

字符串想这

 someString：字符串值
 

你可以看到你的问题是，你需要从 JSON对象 JSON 字符串区分p>

$ Error:: JSONException:json string cannot be converted to JSONObject with helps of JSON Array

This is Import libraries

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.os.AsyncTask;
import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;

activity_main.xml file

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

<ListView
    android:id="@+id/listView1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="14dp" >
</ListView>

Internet Permission is Here

<uses-permission android:name="android.permission.INTERNET" />

error Please give me Answer How to get Multiple Values Using this Code and show into my ListView

This Is my MainActivity.java class file.

public class MainActivity extends Activity
{
    private String jsonResult;
    private String url = "YOUR_PHP_FILE_URL";
    private ListView listView;
    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView = (ListView) findViewById(R.id.listView1);
        accessWebService();
     }

     @Override
     public boolean onCreateOptionsMenu(Menu menu)
     {
          // Inflate the menu; this adds items to the action bar if it is present.
          getMenuInflater().inflate(R.menu.main, menu);
          return true;
     }

     // Async Task to access the web
     @SuppressLint("NewApi")
    private class JsonReadTask extends AsyncTask<String, Void, String>
     {
         @Override
         protected String doInBackground(String... params) 
         {
             HttpClient httpclient = new DefaultHttpClient();
             HttpPost httppost = new HttpPost(params[0]);
             try
             {
                 HttpResponse response = httpclient.execute(httppost);
                 jsonResult = inputStreamToString(response.getEntity().getContent()).toString();
             }
             catch (ClientProtocolException e) 
             {
                 e.printStackTrace();
             } 
             catch (IOException e)
             {
                 e.printStackTrace();
             }
             return null;
         }

         private StringBuilder inputStreamToString(InputStream is) 
         {
             String rLine = "";
             StringBuilder answer = new StringBuilder();
             BufferedReader rd = new BufferedReader(new InputStreamReader(is));

             try 
             {
                 while ((rLine = rd.readLine()) != null)
                 {
                     answer.append(rLine);
                     Log.d(answer.toString(), "String Builder Class in IF Loop");
                 }
             }
             catch (IOException e)
             {
                 // e.printStackTrace();
                 Toast.makeText(getApplicationContext(),"Error..." + e.toString(), Toast.LENGTH_LONG).show();
                 Log.d(answer.toString(), "String Builder Class in Else Part");
             }
             return answer;
         }

         @Override
         protected void onPostExecute(String result)
         {
             ListDrwaer();
         }
     }// end async task

     public void accessWebService()
     {
         JsonReadTask task = new JsonReadTask();
          // passes values for the urls string array
          task.execute(new String[] { url });
     }

     // build hash set for list view
     public <jsonResult> void ListDrwaer() 
     {
         ArrayList<Map<String,String>> userList = new ArrayList<Map<String, String>>();
         Log.d(userList.toString(), "Starting JSONObject");

         try 
         {             
             Log.d("Starting Try Block", "Before JSONObject");

             JSONObject jsonResponse = new JSONObject(jsonResult);
             JSONArray jsonMainNode = jsonResponse.getJSONArray("user_info");

             Log.d(jsonMainNode.toString(), "Starting JSONObject");

             for (int i = 0; i < jsonMainNode.length(); i++) 
             {
                 JSONObject jsonChildNode = jsonMainNode.getJSONObject(i);
                 String id = jsonChildNode.optString("Id:");
                 String name = jsonChildNode.optString("Name:");
                 String email = jsonChildNode.optString("Email:");
                 String phone = jsonChildNode.optString("Phone:");
                 String password = jsonChildNode.optString("Password");
                 String outPut = id + "-" + name+ "-" + email+ "-" + phone+ "-" + password;
                 userList.add(createEmployee("user_info", outPut));
                 Log.d(jsonChildNode.toString(), "Starting JSONObject inside For Loop");
             }
         } 
         catch (JSONException e)
         {
             Toast.makeText(getApplicationContext(), "Error" + e.toString(),Toast.LENGTH_SHORT).show();
             Log.e("log_tag", "Failed data was:\n" + jsonResult);
         }

         SimpleAdapter simpleAdapter = new SimpleAdapter(this, userList,android.R.layout.simple_list_item_1,new String[] { "user_info" }, new int[] { android.R.id.text1 });
         listView.setAdapter(simpleAdapter);
     }

     private HashMap<String, String> createEmployee(String name, String number) 
     {
      HashMap<String, String> employeeNameNo = new HashMap<String, String>();
      employeeNameNo.put(name, number);
      return employeeNameNo;
     }
}

解决方案

ok the error you are getting is very generic, error itself tells what you are doing wrong

$ Error:: JSONException:json string cannot be converted to JSONObject with helps of JSON Array,

I believe you have string in the JSON data, "dummy data" as it is in double quotes which you are trying to read as a JSONObject. It is not a JSONObject but a String primitive type,

while parsing JSON you need to play attention to what is a Object, Array and primitive-type

JSONObject 

will always be enclosed in { } so this represents that data inside a parentheses is a JSONObject, Example===>

JSONObject json = jsonArray.getJSONObject(i) 

or

 JSONObject json = new JSONObject("JSON DATA");


JSONArray 

will always be enclosed in [ ] so this represents that data inside a square bracket is a JSONArray, Example==> `json.getJSONArray("name of jsonArray");

Primitive-type

Boolean would like this

"isSelected":true
or
"isSelected":false

Integer would like this

"someInt":12

String would like this

"someString":"String value" 

as you can see where your problem is, you need to distinguish between JSON String from JSON Object

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