Why I can't Connect My node.js Server from My Android Java Project?

Question

I can connect to server from my java console app but I can't connect to server from my android project, I have Internet and Acces Network permissions on AndroidManifest.xml

Here is my Activity;

public class MainActivity extends Activity 
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        try
        {
            Socket s = new Socket("127.0.0.1", 3619);
        }
        catch (IOException e)
        {}
    }
}