import java.beans.PropertyChangeEvent;

import java.beans.PropertyChangeListener;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.TextView;

import com.example.propertytest.bean.MainBean;


// 调用的时候必须实现PropertyChangeListener接口

public class MainActivity extends Activity implements PropertyChangeListener{

    private TextView text;

    MainBean mBean;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        text = (TextView) findViewById(R.id.textview);

        
　　　　// 创建Bean的实例且添加属性监听器

        mBean = new MainBean();

        mBean.addPropertyChangeListener(this);

    }

    public void btn(View v){

        // 触发属性改动的方法

        mBean.setName("yoyo");

    }


　　// 这个方法被通知属性改变

    @Override

    public void propertyChange(PropertyChangeEvent event) {

        System.out.println(event.getNewValue().toString());

        System.out.println(event.getOldValue().toString());

    }

    @Override

    protected void onDestroy() {

        // TODO Auto-generated method stub

        mBean.removePropertyChangeListener(this);

        super.onDestroy();

    }

}

import java.beans.PropertyChangeListener;

import java.beans.PropertyChangeSupport;

public class MainBean {

    private String name = "123";

    public String getName() {

        return name;

    }

    public void setName(String name_) {

        String oldValue = name;

        name = name_;  
　　　　 // 向外通知属性改变方法，会自动调用propertyChange方法

        changeSupport.firePropertyChange("name", oldValue, name);

    }

    
　　// 创建一个PropertyChangeSupport实例

    private PropertyChangeSupport changeSupport = new PropertyChangeSupport(this);

    
　　// 添加属性监听器

    public void addPropertyChangeListener(PropertyChangeListener l) {

        changeSupport.addPropertyChangeListener(l);

    }

    
　　 // 移除属性监听器

    public void removePropertyChangeListener(PropertyChangeListener l) {

        changeSupport.removePropertyChangeListener(l);

    }

}