Android : I'm having trouble communicating between android and nodejs! please help me

I'm having trouble sharing data between android and nodejs server.

When nodejs server emits data to android, i wanna put this data into edittext by using setText() but it doesn't work.... please help me!!

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    button = (Button)findViewById(R.id.button1);
    editText1 = (EditText)findViewById(R.id.editText1);
    editText2 = (EditText)findViewById(R.id.editText2);

    socket_initialize();

    button.setOnClickListener(new OnClickListener(){

        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            socket.emit("adr_msg", editText2.getText().toString());

        }
    });

}

private void socket_initialize() {
    // TODO Auto-generated method stub
     try {
        socket = new SocketIO("http://192.168.219.100:3000");
        socket.connect(new IOCallback(){

            public void on(String arg0, IOAcknowledge arg1, Object... arg2) {
                // TODO Auto-generated method stub
                if("gogo".equals(arg0)){
                    Log.d("see this:","working");
                }
                else if("serv_msg".equals(arg0)){
                    //Toast.makeText(getApplicationContext(), "working: "+arg2[0].toString(), Toast.LENGTH_SHORT).show();
                    Log.d("testing : ",arg2[0].toString());

                   -->  editText1.setText(arg2[0].toString()); 
                  // this code occurs an error!


                }
            }