Android之Bean属性通知类

调用：

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(); } }

Bean类：

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);      }}

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