Android下按钮的使用方法

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
    @Override
    public void onClick(View v) {                                             //按钮事件
        // TODO Auto-generated method stub
        setTitle("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>