Android的系统通知栏小例子

package com.example.notification;import android.app.Activity;import android.app.Notification;import android.app.NotificationManager;import android.app.PendingIntent;import android.content.Context;import android.content.Intent;import android.os.Bundle;import android.view.Menu;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);create();}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.activity_main, menu);return true;}private void create(){String ns = Context.NOTIFICATION_SERVICE;NotificationManager mNotificationManager = (NotificationManager) getSystemService(ns);//2-实例化Notification：int icon = R.drawable.ic_launcher;CharSequence tickerText = "Hello";long when = System.currentTimeMillis();Notification notification = new Notification(icon, tickerText, when);Context context = getApplicationContext();CharSequence contentTitle = "My notification";CharSequence contentText = "Hello World!";Intent notificationIntent = new Intent(this, MainActivity.class);PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);notification.setLatestEventInfo(context, contentTitle, contentText, contentIntent);final int HELLO_ID = 1;mNotificationManager.notify(HELLO_ID, notification);}}