Android下按扭的使用方法

package com.hangsheng.button;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.Button;public class Ex07_WidgetButtonActivity extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);   //关联布局模板文件main.xml        find_and_modify_button();        //调用成员函数find_and_modity_button    }   private void find_and_modify_button(){   Button button =(Button)findViewById(R.id.button);        //通过资源内ID为button的资源来实例化button对象   button.setOnClickListener(button_listener);              //设置对象button的监听器      };   private Button.OnClickListener button_listener =new Button.OnClickListener(){  //成员按钮监听对象@Overridepublic void onClick(View v) {                                             //按钮事件// TODO Auto-generated method stubsetTitle("button被点击了一下");}   };}

布局模板文件main.xml:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="@string/hello" />    <Button        android:id="@+id/button"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="这是Button" /></LinearLayout>