Change CheckBox text on select event

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >/*  w  w w. j a  v a  2s. c  om*/
    <CheckBox
        android:id="@+id/check"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="This checkbox is: unchecked" />

</LinearLayout>

package com.java2s.app;
//  ww w .  java  2 s . c  o m
import android.app.Activity;
import android.os.Bundle;
import android.widget.CheckBox;
import android.widget.CompoundButton;

public class MainActivity extends Activity
        implements CompoundButton.OnCheckedChangeListener {
    CheckBox cb;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        cb = (CheckBox) findViewById(R.id.check);
        cb.setOnCheckedChangeListener(this);
    }

    public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
        if (isChecked) {
            cb.setText("This checkbox is: checked");
        } else {
            cb.setText("This checkbox is: unchecked");
        }
    }
}