在android中解析来自url的JSON响应

Question

我遇到一个问题，我正在解析 JSON 响应，但它返回一个错误：

cannot be converted into JSONArray

可能的解决方案是什么？

我的 JSON 响应：

BIZRATE.Suggest.callback({
 "results":{
    "status":200,
    "keyword":"iphone",
    "suggestions":[  
       "<b>iphone<\/b>",
       "<b>iphone<\/b> cover",
       "<b>iphone<\/b> 4",
       "<b>iphone<\/b> case",
       "rhinestone <b>iphone<\/b> cases",
       "bling <b>iphone<\/b> case",
       "glitter <b>iphone<\/b> case",
       "<b>iphone<\/b> 3g",
       "purple <b>iphone<\/b> case",
       "<b>iphone<\/b> 4 cases"
      ]
    }
  })

我的代码：

package com.ex.test;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;

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

import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class test extends Activity {

    /** Called when the activity is first created. */
    @SuppressWarnings({ "rawtypes", "unchecked" })
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        ListView lv = (ListView)findViewById(R.id.listView1);

        lv.setAdapter(new ArrayAdapter(this, android.R.layout.simple_list_item_1, this.fetchTwitterPublicTimeline()));        
    }

    public ArrayList<String> fetchTwitterPublicTimeline()
    {
        ArrayList<String> listItems = new ArrayList<String>();

        try {
            URL twitter = new URL(
                    "http://suggest.bizrate.com/app/search?countryCode=US&numResult=10&callback=BIZRATE.Suggest.callback&keyword=iphone&format=json");
            URLConnection tc = twitter.openConnection();
            BufferedReader in = new BufferedReader(new InputStreamReader(
                    tc.getInputStream()));

            String line;
            while ((line = in.readLine()) != null) {
                JSONArray ja = new JSONArray(line);

                for (int i = 0; i < ja.length(); i++) {
                    JSONObject jo = (JSONObject) ja.get(i);
                    System.out.println("value----"+jo.getString("suggestions"));
                    listItems.add(jo.getString("suggestions"));
                }
            }
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return listItems;
    }
}

我的错误：

05-03 10:22:44.955: WARN/System.err(427): org.json.JSONException: Value BIZRATE.Suggest.callback( of type java.lang.String cannot be converted to JSONArray
05-03 10:22:44.965: WARN/System.err(427):     at org.json.JSON.typeMismatch(JSON.java:107)
05-03 10:22:44.965: WARN/System.err(427):     at org.json.JSONArray.<init>(JSONArray.java:91)
05-03 10:22:44.974: WARN/System.err(427):     at org.json.JSONArray.<init>(JSONArray.java:103)
05-03 10:22:44.974: WARN/System.err(427):     at com.ex.test.test.fetchTwitterPublicTimeline(test.java:47)
05-03 10:22:44.974: WARN/System.err(427):     at com.ex.test.test.onCreate(test.java:31)
05-03 10:22:44.984: WARN/System.err(427):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
05-03 10:22:44.984: WARN/System.err(427):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
05-03 10:22:44.984: WARN/System.err(427):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
05-03 10:22:44.984: WARN/System.err(427):     at android.app.ActivityThread.access$2300(ActivityThread.java:125)
05-03 10:22:44.984: WARN/System.err(427):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
05-03 10:22:44.994: WARN/System.err(427):     at android.os.Handler.dispatchMessage(Handler.java:99)
05-03 10:22:44.994: WARN/System.err(427):     at android.os.Looper.loop(Looper.java:123)
05-03 10:22:44.994: WARN/System.err(427):     at android.app.ActivityThread.main(ActivityThread.java:4627)
05-03 10:22:45.004: WARN/System.err(427):     at java.lang.reflect.Method.invokeNative(Native Method)
05-03 10:22:45.004: WARN/System.err(427):     at java.lang.reflect.Method.invoke(Method.java:521)
05-03 10:22:45.004: WARN/System.err(427):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
05-03 10:22:45.004: WARN/System.err(427):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
05-03 10:22:45.004: WARN/System.err(427):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

您提到 JSON 响应如下：

> BIZRATE.Suggest.callback({"results":{"status":200,"keyword":"iphone","suggestions":["iphone<\/b>","iphone<\/b>
> cover","iphone<\/b> 4","iphone<\/b>
> case","rhinestone iphone<\/b>
> cases","bling iphone<\/b>
> case","glitter iphone<\/b>
> case","iphone<\/b> 3g","purple
> iphone<\/b> case","iphone<\/b> 4
> cases"]}})

这不是有效的 JSON。您应该切断第一部分，直到（并包括）第一个括号。您还需要删除末尾的括号。这应该会给你一些有效的 JSON。

还要注意的另一件事是斜线在 html 中是如何转义的。根据您使用此数据的方式，您可能不希望它被转义。

以下站点可以帮助您验证 json：
http://www.jsonlint.com/

Answer 2

我可以看到两个问题：

1. 您正在使用 in.readline 读取每行的输出。首先，尝试将整个输出读入 String 对象，以确保您可以使用有效的 JSON。

2. 您的结果最初不是 JSON 数组；它是一个 JSON 对象。我将按如下方式阅读：

   字符串 myUrlResult = ****
   JSONObject j = jo.getJSONObject("结果");
   JSONArray ja = j.getJSONArray("建议");
   

Answer 3

Note: get the response in form of string not in JSON.then use this function.   

/*
 * convert the JSONP (JSON call back function) to JSON.
 * it will split the function name from the string.
 * calculate the length of function +1 (it will include the parenthesis "(" 
   with function name, now terminate the loop.          
 * split the string starting from calculated length and string length -1 (to  remove the ending parenthesis ")".
*/
public static String jsonCallbackToJson(String stringValue){
    String jsonData=null;
    String functionName=null;
    StringTokenizer st = new StringTokenizer(stringValue, "()");
    while (st.hasMoreElements()){
        functionName = st.nextToken();

        break;
        //Log.d("kam","==jsondata=="+jsonData);
    }
    jsonData= stringValue.substring(functionName.length()+1,stringValue.length()-1);
    return jsonData;
}