Retrieving Json Array

Posted by Rahul Varma on Stack Overflow See other posts from Stack Overflow or by Rahul Varma
Published on 2010-04-30T07:56:16Z Indexed on 2010/04/30 10:47 UTC
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Hi, I am trying to retrieve the values from the following url: http://rentopoly.com/ajax.php?query=Bo. I want to get the values of all the suggestions to be displayed in a list view one by one. This is how i want to do...

public class AlertsAdd {
public ArrayList<JSONObject> retrieveJSONArray(String urlString) {
    String result = queryRESTurl(urlString);
    ArrayList<JSONObject> ALERTS = new ArrayList<JSONObject>();
    if (result != null) {

        try {
            JSONObject json = new JSONObject(result);
            JSONArray alertsArray = json.getJSONArray("suggestions");
            for (int a = 0; a < alertsArray.length(); a++) {
                JSONObject alertitem = alertsArray.getJSONObject(a);
                ALERTS.add(alertitem);
            }
            return ALERTS;
        } catch (JSONException e) {
            Log.e("JSON", "There was an error parsing the JSON", e);                
        }           
    }
    JSONObject myObject = new JSONObject();
    try {
        myObject.put("suggestions",myObject.getJSONArray("suggestions"));
        ALERTS.add(myObject);
    } catch (JSONException e1) {
        Log.e("JSON", "There was an error creating the JSONObject", e1);
    }
    return ALERTS;
}
private String queryRESTurl(String url) {
    // URLConnection connection;
    HttpClient httpclient = new DefaultHttpClient();
    HttpGet httpget = new HttpGet(url);
    HttpResponse response;
    try {           
        response = httpclient.execute(httpget);
        HttpEntity entity = response.getEntity();
    if (entity != null) {
            InputStream instream = entity.getContent();
            String result = convertStreamToString(instream);
            instream.close();
            return result;
        }
    } catch (ClientProtocolException e) {
        Log.e("REST", "There was a protocol based error", e);
    } catch (IOException e) {
        Log.e("REST", "There was an IO Stream related error", e);           
    }
    return null;
}

/**
 * To convert the InputStream to String we use the
 * BufferedReader.readLine() method. We iterate until the BufferedReader
 * return null which means there's no more data to read. Each line will
 * appended to a StringBuilder and returned as String.
 */
private String convertStreamToString(InputStream is) {
    BufferedReader reader = new BufferedReader(new InputStreamReader(is));
    StringBuilder sb = new StringBuilder();

    String line = null;
    try {
        while ((line = reader.readLine()) != null) {
            sb.append(line + "\n");
        }
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        try {
            is.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return sb.toString();
}

}

Here's the adapter code...

public class AlertsAdapter extends ArrayAdapter<JSONObject> {
public AlertsAdapter(Activity activity, List<JSONObject> alerts) {
    super(activity, 0, alerts);
}
 @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        Activity activity = (Activity) getContext();
        LayoutInflater inflater = activity.getLayoutInflater();
        View rowView = inflater.inflate(R.layout.list_text, null);
        JSONObject imageAndText = getItem(position);
        TextView textView = (TextView) rowView.findViewById(R.id.last_build_stat);
        try {
            textView.setText((String)imageAndText.get("suggestions"));
        } catch (JSONException e) {
            textView.setText("JSON Exception");
        }
        return rowView;
    }

}

Here's the logcat...

 04-30 13:09:46.656: INFO/ActivityManager(584): Starting activity: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.WorldToyota/.Alerts }

04-30 13:09:50.417: ERROR/JSON(924): There was an error parsing the JSON 04-30 13:09:50.417: ERROR/JSON(924): org.json.JSONException: JSONArray[0] is not a JSONObject. 04-30 13:09:50.417: ERROR/JSON(924): at org.json.JSONArray.getJSONObject(JSONArray.java:268) 04-30 13:09:50.417: ERROR/JSON(924): at com.WorldToyota.AlertsAdd.retrieveJSONArray(AlertsAdd.java:30) 04-30 13:09:50.417: ERROR/JSON(924): at com.WorldToyota.Alerts.onCreate(Alerts.java:20) 04-30 13:09:50.417: ERROR/JSON(924): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123) 04-30 13:09:50.417: ERROR/JSON(924): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364) 04-30 13:09:50.417: ERROR/JSON(924): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417) 04-30 13:09:50.417: ERROR/JSON(924): at android.app.ActivityThread.access$2100(ActivityThread.java:116) 04-30 13:09:50.417: ERROR/JSON(924): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794) 04-30 13:09:50.417: ERROR/JSON(924): at android.os.Handler.dispatchMessage(Handler.java:99) 04-30 13:09:50.417: ERROR/JSON(924): at android.os.Looper.loop(Looper.java:123) 04-30 13:09:50.417: ERROR/JSON(924): at android.app.ActivityThread.main(ActivityThread.java:4203) 04-30 13:09:50.417: ERROR/JSON(924): at java.lang.reflect.Method.invokeNative(Native Method) 04-30 13:09:50.417: ERROR/JSON(924): at java.lang.reflect.Method.invoke(Method.java:521) 04-30 13:09:50.417: ERROR/JSON(924): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) 04-30 13:09:50.417: ERROR/JSON(924): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549) 04-30 13:09:50.417: ERROR/JSON(924): at dalvik.system.NativeStart.main(Native Method) 04-30 13:09:50.688: ERROR/JSON(924): There was an error creating the JSONObject 04-30 13:09:50.688: ERROR/JSON(924): org.json.JSONException: JSONObject["suggestions"] not found. 04-30 13:09:50.688: ERROR/JSON(924): at org.json.JSONObject.get(JSONObject.java:287) 04-30 13:09:50.688: ERROR/JSON(924): at org.json.JSONObject.getJSONArray(JSONObject.java:362) 04-30 13:09:50.688: ERROR/JSON(924): at com.WorldToyota.AlertsAdd.retrieveJSONArray(AlertsAdd.java:41) 04-30 13:09:50.688: ERROR/JSON(924): at com.WorldToyota.Alerts.onCreate(Alerts.java:20) 04-30 13:09:50.688: ERROR/JSON(924): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123) 04-30 13:09:50.688: ERROR/JSON(924): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364) 04-30 13:09:50.688: ERROR/JSON(924): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417) 04-30 13:09:50.688: ERROR/JSON(924): at android.app.ActivityThread.access$2100(ActivityThread.java:116) 04-30 13:09:50.688: ERROR/JSON(924): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794) 04-30 13:09:50.688: ERROR/JSON(924): at android.os.Handler.dispatchMessage(Handler.java:99) 04-30 13:09:50.688: ERROR/JSON(924): at android.os.Looper.loop(Looper.java:123) 04-30 13:09:50.688: ERROR/JSON(924): at android.app.ActivityThread.main(ActivityThread.java:4203) 04-30 13:09:50.688: ERROR/JSON(924): at java.lang.reflect.Method.invokeNative(Native Method) 04-30 13:09:50.688: ERROR/JSON(924): at java.lang.reflect.Method.invoke(Method.java:521) 04-30 13:09:50.688: ERROR/JSON(924): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) 04-30 13:09:50.688: ERROR/JSON(924): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549) 04-30 13:09:50.688: ERROR/JSON(924): at dalvik.system.NativeStart.main(Native Method)

Plz help me parsing this script and displaying the values in list format....

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