android 显示通知栏

NotificationCompat.Builder实现手机自带的显示通知栏
1.可以显示图片（.setSmallIcon(android.R.drawable.ic_lock_idle_alarm);）
2.可以显示文字（.setContentText(“一大波僵尸正在门口”);）
1.可以显示音乐

  NotificationCompat.Builder notificationCompat=new NotificationCompat.Builder(this);
        //设置参数
        notificationCompat.setDefaults(NotificationCompat.DEFAULT_ALL);
        notificationCompat.setContentTitle("提醒");
        notificationCompat.setContentText("一大波僵尸正在门口");
        notificationCompat.setSmallIcon(android.R.drawable.ic_lock_idle_alarm);
        Notification notification=notificationCompat.build();


        //通知管理器
        NotificationManager notificationManager= (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);