桌面通知

NotificationManager mNotificationManager=(NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
    int icon=android.R.drawable.sym_action_email;
    long when=System.currentTimeMillis();
    
    Notification notification=new Notification(icon,null,when);
    
    notification.defaults=Notification.DEFAULT_SOUND;
    PendingIntent contentIntent=PendingIntent.getActivity(MainActivity.this, 0, null, 0);
    notification.setLatestEventInfo(MainActivity.this, "开会通知", "今天下午四点开会", contentIntent);
    mNotificationManager.notify(0, notification);