Android中使用Notification实现状态栏的通知

package com.example.notification; 
import android.os.Bundle; 
import android.app.Activity; 
import android.app.Notification; 
import android.app.Notification.Builder; 
import android.app.NotificationManager; 
import android.app.PendingIntent; 
import android.content.Context; 
import android.content.Intent; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
public class MainActivity extends Activity implements OnClickListener{ 
 private NotificationManager manager; 
 private Button button1; 
 private Button button2; 
 private int Notification_ID; 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
 super.onCreate(savedInstanceState); 
 setContentView(R.layout.activity_main); 
 manager=(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); 
 button1=(Button) findViewById(R.id.button1); 
 button2=(Button) findViewById(R.id.button2); 
 button1.setOnClickListener(this); 
 button2.setOnClickListener(this); 
 } 
 @Override 
 public void onClick(View v) { 
 // TODO Auto-generated method stub 
 switch(v.getId()){ 
 case R.id.button1:{ 
 showNotification(); 
 break; 
 } 
 case R.id.button2:{ 
 manager.cancel(Notification_ID); 
 break; 
 } 
 } 
 } 
 private void showNotification() { 
 // TODO Auto-generated method stub 
 Notification.Builder builder=new Builder(this); 
 builder.setSmallIcon(R.drawable.ic_launcher);//设置图标 
 builder.setTicker("通知来啦");//手机状态栏的提示 
 builder.setContentTitle("我是通知标题");//设置标题 
 builder.setContentText("我是通知内容");//设置通知内容 
 builder.setWhen(System.currentTimeMillis());//设置通知时间 
 Intent intent=new Intent(this,MainActivity.class); 
 PendingIntent pendingIntent=PendingIntent.getActivity(this, 0, intent, 0); 
 builder.setContentIntent(pendingIntent);//点击后的意图 
 builder.setDefaults(Notification.DEFAULT_LIGHTS);//设置指示灯 
 builder.setDefaults(Notification.DEFAULT_SOUND);//设置提示声音 
 builder.setDefaults(Notification.DEFAULT_VIBRATE);//设置震动 
 Notification notification=builder.build();//4.1以上，以下要用getNotification() 
 manager.notify(Notification_ID, notification); 
 } 
} 

<uses-permission android:name="android.permission.VIBRATE" /> 
<uses-permission android:name="android.permission.FLASHLIGHT" />