Issue with JSONArray parsing

Question

I'm newbye in android world and I'm trying to retrieve a JSONArray from this URL: http://www.softmarketing.it/json/view/azienda/7

TabHostExample.java:

public class TabHostExample extends TabActivity {

private static String url = "http://www.softmarketing.it/json/view/azienda/7";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_tab_host_example);

    //JSONParser parser= new JSONParser();
    //JSONObject myJSON= parser.makeHttpRequest(url, "POST", null);
    try{
        // Create a new HTTP Client
        DefaultHttpClient defaultClient = new DefaultHttpClient();
        // Setup the get request
        HttpGet httpGetRequest = new HttpGet("http://www.softmarketing.it/json/view/azienda/7");

        // Execute the request in the client
        HttpResponse httpResponse = defaultClient.execute(httpGetRequest);
        // Grab the response
        BufferedReader reader = new BufferedReader(new InputStreamReader(httpResponse.getEntity().getContent(), "UTF-8"));
        String json = reader.readLine();

        // Instantiate a JSON object from the request response
        JSONObject jsonObject = new JSONObject(json);

    } catch(Exception e){
        // In your production code handle any errors and catch the individual exceptions
        e.printStackTrace();
    }

           .....

In the LogCat I see this:

12-16 08:14:41.987: E/MYAPP(1183): exception: null
12-16 08:21:34.927: E/MYAPP(1245): exception: null

and the variable e has these values:

e: cause: NetworkOnMainThreadEception

and others values...

Could you help me please? It's been three days that I'm trying to solve the parsing...Thanks

Answer 1

So, you will need to get the json content in a separate thread than the UI... and then parse it.

You can use an Asynctask and HttpGetClient

Or

You can use Android Asynchronous Http Client library. Very simple lib, tiny size (25kb), easy to use and Asynchronous The code will be something like :

AsyncHttpClient client = new AsyncHttpClient();
client.get("http://www.softmarketing.it/json/view/azienda/7", new AsyncHttpResponseHandler() {
    @Override
    public void onSuccess(String response) {
      // Here is your content !
      // now you have to parse it
      System.out.println(response);
    }
});

Available here

Then, you will have to parse to file as you want.(If it's json format I recommend you Gson library)

The rest is on you !

Answer 2

Android doesn't allow you to perform slow operations on the main thread (GUI thread), these include IO operations such as network activity.

If this wasn't the case and your android app was posting to an online service, because the thread would be busy waiting for the server response, the GUI would lock up, and user input would be ignored until the thread had finished sending and receiving the response to the web service. If this goes on for too long, I think around 5 seconds, your application would show up an ANR message (Application Not Responding). This will allow the user to either wait, and hope your app recovers, or force stop the app, this is the most likely option.

You also need to ensure that you have the android:name="android.permission.INTERNET" within your projects AndroidManifest file.