Question

Now I’m solving the

android.os.NetworkOnMainThreadException

I put the connect method into separated thread, but when the thread starts, the start() method doesn’t invoke the Run(),
– and also using the AsyncTask, the task doesn’t invoke the doInBackground() method!

---

// For The AsyncTask my code was

public class ConnectTask extends AsyncTask<URL, Integer, HttpEntity> {

    HttpEntity entity;
    String  statue;
    LogInJSONActivity mainActivity;
    @Override
    protected HttpEntity doInBackground(URL... arg0) {
        // TODO Auto-generated method stub
         mainActivity.setString("Inside Do in background");
         entity = connect(arg0[0]);
         mainActivity.setHttp(entity);
        return entity;
    }

    public  HttpEntity connect(String url) {

        statue= "Inside Connect";
        HttpClient httpclient = new DefaultHttpClient();
        // Prepare a request object
        HttpGet httpget = new HttpGet(url);
        // Execute the request
        HttpResponse response;
        HttpEntity entity = null;
        try {
            response = httpclient.execute(httpget);
            entity = response.getEntity();
        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return entity;
    }
    public void setActivity(LogInJSONActivity act){
        mainActivity = act;
    }
}

-> In The Main Activity

URL url = null;
        try {
            url = new URL("http://www.flickr.com/photos/51469488@N03/");
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        ConnectTask backgroundTask = (ConnectTask) new ConnectTask();
        backgroundTask.setActivity(this);
        backgroundTask.execute(url);

---

// For The Thread My code Was :-

public class ConnectThread extends Thread {

    HttpEntity entity;
    String  statue;
    LogInJSONActivity mainActivity;
    @Override
    public void run() {
        // TODO Auto-generated method stub
         mainActivity.setString("Inside Run");
         entity = connect("http://www.flickr.com/photos/51469488@N03/");
         mainActivity.setHttp(entity);
         super.run();   
    }

    public  HttpEntity connect(String url) {

        statue= "Inside Connect";
        HttpClient httpclient = new DefaultHttpClient();
        // Prepare a request object
        HttpGet httpget = new HttpGet(url);
        // Execute the request
        HttpResponse response;
        HttpEntity entity = null;
        try {
            response = httpclient.execute(httpget);
            entity = response.getEntity();
        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        if(entity !=null)
            System.out.print("Valid Entity");
        else
            System.out.print("Null Entity");


        return entity;
    }
    public void setActivity(LogInJSONActivity act){
        mainActivity = act;
    }      
}

---

-> In the MainActivity

ConnectThread t = new ConnectThread();
        t.setActivity(this);
        t.start();

Answer 1

Your error is probably because you are doing some Network Operation on your UI thread, which is not allowed from API 11.I would say not to create a seperate Thread, just use AsyncTask class to execute your Network operation. Just do your Network Operation in doInBackground() and call the AsyncTask class from the UI thread as,

new YourAsyncTask().execute(url);

Thats all no need to put much efforts by creating a seperate Thread class and making it more complicated.