Android Button

main.xml文件

<?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"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
    <Button
    android:id="@+id/btn1"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="点我1"
    />
    <Button
    android:id="@+id/btn2"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="点我2"
    />
</LinearLayout>

strings.xml文件

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">按钮的设置!</string>
    <string name="app_name">ButtonDemo</string>
</resources>

MainActivity.java文件

package com.xuefei.button.activity;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends Activity {
    /** Called when the activity is first created. */
 private Button btn1=null;
 private Button btn2=null;
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  btn1=(Button)findViewById(R.id.btn1);
  btn2=(Button)findViewById(R.id.btn2);
  btn1.setOnClickListener(listener);
  btn2.setOnClickListener(listener);
 }
//    @Override
//    public void onCreate(Bundle savedInstanceState) {
//        super.onCreate(savedInstanceState);
//        setContentView(R.layout.main);
//        btn1=(Button)findViewById(R.id.btn1);
//        btn2=(Button)findViewById(R.id.btn2);
//        btn1.setOnClickListener(new OnClickListener()
//        { 
//   @Override
//   public void onClick(View v) {
//    // TODO Auto-generated method stub
//    Toast.makeText(MainActivity.this, "你点击了按钮1。",Toast.LENGTH_SHORT ).show(); 
//    
//   }
//        });
//        btn2.setOnClickListener(new OnClickListener()
//        { 
//   @Override
//   public void onClick(View v) {
//    // TODO Auto-generated method stub
//    Toast.makeText(MainActivity.this, "你点击了按钮2。",Toast.LENGTH_SHORT ).show(); 
//    
//   }
//        });
// 
//class ButtonClick implements OnClickListener
//{
// public void onClick(View v)
// {
//  System.out.println("你点击了按钮！");
// }
//}
//内部匿名类
  private OnClickListener listener=new OnClickListener()
  {
   @Override
   public void onClick(View v)
   {
    Button btn=(Button)v;
    switch (btn.getId())
    {
    case R.id.btn1:
     Toast.makeText(MainActivity.this, "你点击了按钮1。",Toast.LENGTH_SHORT ).show(); 
     break;
    case R.id.btn2:
     Toast.makeText(MainActivity.this, "你点击了按钮2。",Toast.LENGTH_SHORT ).show(); 
     break;
   }
   }
  };
}