将字符串解析为JSONObject时出现错误 - Android

嗨我得到的字符串由JSONobject组成，并将其转换为JSON时出现错误。有时候它有效，有时候不会......我不知道为什么。将字符串解析为JSONObject时出现错误 - Android

这是我的代码。我试图赶上后请愿的回应：

public class DBupload { 

public JSONObject UploaData(ArrayList<NameValuePair> nvp, String url) { 
    try { 

     DefaultHttpClient client = new DefaultHttpClient(); 
     HttpPost hpost = new HttpPost(url); 
     hpost.setEntity(new UrlEncodedFormEntity(nvp)); 
     HttpResponse response = client.execute(hpost); 

     HttpEntity entity = response.getEntity(); 
     InputStream is = entity.getContent(); 

     BufferedReader reader = new BufferedReader(new InputStreamReader(
       is, "iso-8859-1"), 8); 
     StringBuilder sb = new StringBuilder(); 
     String line = null; 
     while ((line = reader.readLine()) != null) { 
      sb.append(line + "\n"); 
     } 
     is.close(); 
     String result = sb.toString(); 

     JSONObject jobject = new JSONObject(result); 

     return jobject; 

    } catch (Exception ex) { 
     ex.printStackTrace(); 
     return null; 
    } 

}

}

然后返回jobject：

JSONObject json2 = upload.UploaData(nvp, 
        "http://anonyme.mariomontes.es/geolocation/insert"); 

      try { 
       if (json2.getInt("error") == 1) { 
        Log.i("************", 
          "You have an error while uploading Location"); 
       }

它给我的错误：

> 07-10 16:33:34.225: W/System.err(13028): org.json.JSONException: Value Class of type java.lang.String cannot be converted to JSONObject 
07-10 16:33:34.230: W/System.err(13028): at org.json.JSON.typeMismatch(JSON.java:111) 
07-10 16:33:34.230: W/System.err(13028): at org.json.JSONObject.<init>(JSONObject.java:158) 
07-10 16:33:34.230: W/System.err(13028): at org.json.JSONObject.<init>(JSONObject.java:171) 
07-10 16:33:34.230: W/System.err(13028): at com.background.DBupload.UploaData(DBupload.java:39) 
07-10 16:33:34.230: W/System.err(13028): at com.extract.MyLocation.mostrarPosicion(MyLocation.java:107) 
07-10 16:33:34.230: W/System.err(13028): at com.extract.MyLocation$1.onLocationChanged(MyLocation.java:59) 
07-10 16:33:34.230: W/System.err(13028): at android.location.LocationManager$ListenerTransport._handleMessage(LocationManager.java:227) 
07-10 16:33:34.230: W/System.err(13028): at android.location.LocationManager$ListenerTransport.access$000(LocationManager.java:160) 
07-10 16:33:34.230: W/System.err(13028): at android.location.LocationManager$ListenerTransport$1.handleMessage(LocationManager.java:176) 
07-10 16:33:34.230: W/System.err(13028): at android.os.Handler.dispatchMessage(Handler.java:99) 
07-10 16:33:34.230: W/System.err(13028): at android.os.Looper.loop(Looper.java:137) 
07-10 16:33:34.230: W/System.err(13028): at android.app.ActivityThread.main(ActivityThread.java:4507) 
07-10 16:33:34.230: W/System.err(13028): at java.lang.reflect.Method.invokeNative(Native Method) 
07-10 16:33:34.230: W/System.err(13028): at java.lang.reflect.Method.invoke(Method.java:511) 
07-10 16:33:34.230: W/System.err(13028): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790) 
07-10 16:33:34.230: W/System.err(13028): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557) 
07-10 16:33:34.230: W/System.err(13028): at dalvik.system.NativeStart.main(Native Method) 
07-10 16:33:34.230: D/AndroidRuntime(13028): Shutting down VM 
07-10 16:33:34.230: W/dalvikvm(13028): threadid=1: thread exiting with uncaught exception (group=0x40c341f8) 
07-10 16:33:34.235: E/AndroidRuntime(13028): FATAL EXCEPTION: main 
07-10 16:33:34.235: E/AndroidRuntime(13028): java.lang.NullPointerException 
07-10 16:33:34.235: E/AndroidRuntime(13028): at com.extract.MyLocation.mostrarPosicion(MyLocation.java:111) 
07-10 16:33:34.235: E/AndroidRuntime(13028): at com.extract.MyLocation$1.onLocationChanged(MyLocation.java:59) 
07-10 16:33:34.235: E/AndroidRuntime(13028): at android.location.LocationManager$ListenerTransport._handleMessage(LocationManager.java:227) 
07-10 16:33:34.235: E/AndroidRuntime(13028): at android.location.LocationManager$ListenerTransport.access$000(LocationManager.java:160) 
07-10 16:33:34.235: E/AndroidRuntime(13028): at android.location.LocationManager$ListenerTransport$1.handleMessage(LocationManager.java:176) 
07-10 16:33:34.235: E/AndroidRuntime(13028): at android.os.Handler.dispatchMessage(Handler.java:99) 
07-10 16:33:34.235: E/AndroidRuntime(13028): at android.os.Looper.loop(Looper.java:137) 
07-10 16:33:34.235: E/AndroidRuntime(13028): at android.app.ActivityThread.main(ActivityThread.java:4507) 
07-10 16:33:34.235: E/AndroidRuntime(13028): at java.lang.reflect.Method.invokeNative(Native Method) 
07-10 16:33:34.235: E/AndroidRuntime(13028): at java.lang.reflect.Method.invoke(Method.java:511) 
07-10 16:33:34.235: E/AndroidRuntime(13028): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790) 
07-10 16:33:34.235: E/AndroidRuntime(13028): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557) 
07-10 16:33:34.235: E/AndroidRuntime(13028): at dalvik.system.NativeStart.main(Native Method)

来源

2012-07-10 Marc Ortiz

我建议你做一个''result''的输出 - 当它引发错误时，查看它实际是什么。 – ninetwozero 2012-07-10 14:41:26

我第二@ninetwozero建议，我不认为结果包含有效的JSON – 2012-07-10 14:44:10

谢谢@ninetwozero错误whas那里:) – 2012-07-10 14:44:34

<exported from="comments"> 
    I'd recommend you do an output of the result-variable 
    to see what it actually is when it sparks an error. 
</exported>

来源

2012-07-10 14:46:27 ninetwozero

将字符串解析为JSONObject时出现错误 - Android

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