can not connect my app to web service

Question

can not work my android app when connect web service and can not connect to web service

     public class Rgister extends Activity {
        private Spinner spinner1, spinner2, spinner3, spinner4;
            public  static String res="";
            private Button mButton;
            static final String AB = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
            static Random rnd = new Random();

            public void onCreate(Bundle savedInstanceState) {
                requestWindowFeature(Window.FEATURE_NO_TITLE);
                super.onCreate(savedInstanceState);
                setContentView(R.layout.register);
                ImageView v = (ImageView) findViewById(R.id.image_2);
                v.setImageResource(R.drawable.logo_);
                new GetData("","feri").execute();
            }
}

Answer 1

and GetData class:

class GetData extends AsyncTask {


    private String Link = "";

    private String User = "";

    public GetData(String link, String user) {

        Link = link;
        User = user;

    }


    @Override
    protected String doInBackground(Object[] params) {

        try {
            String data= URLEncoder.encode("user", "UTF8")+"="+URLEncoder.encode(User,"UTF8");
            URL mylink = new URL(Link);
            URLConnection connect = mylink.openConnection();


            connect.setDoOutput(true);
            OutputStreamWriter wr=new OutputStreamWriter(connect.getOutputStream());
            wr.write(data);
            wr.flush();
            BufferedReader reader = new BufferedReader(
                    new InputStreamReader(connect.getInputStream()));
            StringBuilder sb = new StringBuilder();

            String line = null;
            while ((line = reader.readLine()) != null) {

                sb.append("line");


            }
            Rgister.res=sb.toString();
        } catch (Exception e) {

        }

        return "";


    }
}