Why my java app for android not connect to server ?

I run the aplication in android emulator, and the server wich port 9999 and host 127.0.0.1 in my pc, but just not connect and i think this method isn't good for android app.

It is my source code:

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
//Java imports
//import android.util.Log;
import java.io.*;
import java.net.*;
import java.util.*;
import java.util.logging.Level;
import java.util.logging.Logger;


public class MainActivity extends Activity
{
    //Variaveis Interface
    private Button ligar;
private Button enviar;
private EditText text1;
private TextView text2;
    //Variaveis
    static Socket cSocket;
    static PrintWriter out;
    static BufferedReader in;


/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    //Declaração butões
    ligar = (Button) findViewById(R.id.ligar);
    enviar = (Button) findViewById(R.id.enviar);
    text1 = (EditText) findViewById(R.id.text1);
    text2 = (TextView) findViewById(R.id.text2);

    //Interacao
    ligar.setOnClickListener(new OnClickListener(){
        public void onClick(View arg0){

             connect();   


        }
    });
    enviar.setOnClickListener(new OnClickListener(){
        public void onClick(View arg0){

               out.println("Hello");
               text2.setText(""); 

        }
    });  
  }
  //Outras Funcoes

public void connect(){
//Funcao ligar
cSocket = null;
out = null;
in = null;

try 
   {

    cSocket = new Socket("127.0.0.1",9999);

    out = new PrintWriter(cSocket.getOutputStream(), true);
    in = new BufferedReader(new InputStreamReader(cSocket.getInputStream()));

    text2.setText("Estas conectado com sucesso.");
    }
    catch (IOException ex) {
    //Logger.getLogger(client.class.getName()).log(Level.SEVERE, null, ex);
    text2.setText("Erro! Na conexão");
    }                
   }
//  
}