JSON Parsing works on Android 4.0 but not on Android < 4.0 [duplicate]

Question

Possible Duplicate:
JSON parsing problem

I am parsing a JSON file (Which is valid). It works on Android 4.0 - 4.0.4 but not on older Android versions. This is a part of my Manifest:

<uses-sdk
    android:minSdkVersion="7"
    android:targetSdkVersion="14" />

And this is my parsing code:

public JSONObject getJSONFromUrl(String url) {
    try {
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost(url);

        HttpResponse httpResponse = httpClient.execute(httpPost);
        HttpEntity httpEntity = httpResponse.getEntity();
        is = httpEntity.getContent();

    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    try {
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                is, "UTF-8"), 8);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) {
            sb.append(line + "\n");
        }
        is.close();
        json = sb.toString();
    } catch (Exception e) {
        Log.e("Buffer Error", "Error converting result " + e.toString());
    }

    try {
        jObj = new JSONObject(json);
    } catch (JSONException e) {
        Log.e("JSON Parser", "Error parsing data " + e.toString());
    }

    return jObj;

}

And on the older devices I get the following error message (But as I said not on new Android devices):

org.json.JSONException: Value of type java.lang.String cannot be converted to JSONObject

I have absolutely no idea why it does work on Android 4 but not on older devices.

Find the Json from here

Answer 1

It is possible that the JSONObject parser has been made more lenient in newer Android releases. The error message you are getting appears to be due to dubiously-legal JSON, particularly on the receiving side:

• Issue initializing a JSONObject
• JSON parsing problem

I would suggest that you write your downloaded JSON out to a file and compare it with your original to see if there is a problem with the download logic.

---

UPDATE

I cannot reproduce your problem. Loading that JSON off of external storage works perfectly fine on Android 4.0.3., 2.3.3, 2.2, and 2.1, using the following activity (note: I was lazy and hard-wired in the path to external storage):

package com.commonsware.jsontest;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import org.json.JSONException;
import org.json.JSONObject;

public class JSONTestActivity extends Activity {
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    try {
      BufferedReader in=
          new BufferedReader(new FileReader("/mnt/sdcard/test.json"));
      String str;
      StringBuilder buf=new StringBuilder();

      while ((str=in.readLine()) != null) {
        buf.append(str);
        buf.append("\n");
      }

      in.close();
      JSONObject json=new JSONObject(buf.toString());

      ((TextView)findViewById(R.id.stuff)).setText(json.toString());
    }
    catch (IOException e) {
      Log.e(getClass().getSimpleName(), "Exception loading file", e);
    }
    catch (JSONException e) {
      Log.e(getClass().getSimpleName(), "Exception parsing file", e);
    }
  }
}

Answer 2

Usually these are the following steps to create json object through the Http connection in android.

1. open the connection and get the response.
2. get the content and create a string builder.
3. make the string builder into json array object (this step you have not done)
4. get json object from the json array object.

I think you missed to convert String Buffer(sb) into json array object. Instead of that you directly create the json object from string buffer. I dont know how its was worked in android 4.0. The modified code is

public JSONObject getJSONFromUrl(String url) {
    try {
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost(url);

        HttpResponse httpResponse = httpClient.execute(httpPost);
        HttpEntity httpEntity = httpResponse.getEntity();
        is = httpEntity.getContent();

    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    try {
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                is, "UTF-8"), 8);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) {
            sb.append(line + "\n");
        }
        is.close();
        json = sb.toString();
    } catch (Exception e) {
        Log.e("Buffer Error", "Error converting result " + e.toString());
    }

    try {
       JSONArray jObj = new JSONArray(json);
    } catch (JSONException e) {
        Log.e("JSON Parser", "Error parsing data " + e.toString());
    }

    return jObj;

}

And you can get the json object by passing index value like,

jObj.getJSONObject(i); /*i is a integer, index value*/

Answer 3

Hello i used the following code and i did not get any errors in 2.2, 2.3.3 code is very simple.

import java.io.IOException;

import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;

public class NannuExpActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        try {
            JSONObject jo = getJSONObjectFromUrl("http://pastebin.com/raw.php?i=Jp6Z2wmX");
            for(int i=0;i<jo.getJSONArray("map_locations").length();i++)
            Log.d("Data",jo.getJSONArray("map_locations").getJSONObject(i).getString("title"));
        } catch (ClientProtocolException 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();
        }


    }

    public JSONObject getJSONObjectFromUrl(String url) throws ClientProtocolException, IOException, JSONException{
        JSONObject jobj = null;
        HttpClient hc = new DefaultHttpClient();
        HttpGet hGet = new HttpGet(url);
        ResponseHandler<String> rHand = new BasicResponseHandler();
        String resp = "";
        resp = hc.execute(hGet,rHand);
        jobj = new JSONObject(resp);    
        return jobj;
    }
}

Hope it helps.