Android开发心得(二) 通知

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通知(Notification)是Android系统中比较有特色的一个功能。《第一行代码》中关于通知的例子如下：

    NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    Notification notification = new Notification(R.drawable.ic_launcher, "This is ticker text", System.currentTimeMillis());

    notification.ledARGB = Color.GREEN;
    notification.ledOnMS = 1000;
    notification.ledOffMS = 1000;
    notification.flags = Notification.FLAG_SHOW_LIGHTS;
    Intent intent = new Intent(this, NotificationActivity.class);
    PendingIntent pi = PendingIntent.getActivity(this, 0, intent,
                PendingIntent.FLAG_CANCEL_CURRENT);
    notification.setLatestEventInfo(this, "This is content title",
                "This is content text", pi);
    manager.notify(1, notification);

低于API Level 11版本，也就是Android 2.3.3以下的系统中，setLatestEventInfo()函数是唯一的实现方法。

高于API Level 11，低于API Level 16 (Android 4.1.2)版本的系统中，可使用Notification.Builder来构造函数。但要使用getNotification()来使notification实现。此时，前面版本在notification中设置的Flags，icon等属性都已经无效，要在builder里面设置。

高于API Level 16的版本，就可以用Builder和build()函数来配套的方便使用notification了。

例子如下：

            NotificationCompat.Builder notificationBuilder=new NotificationCompat.Builder(MainActivity.this);
            notificationBuilder.setContentTitle(Build.PRODUCT);
            notificationBuilder.setContentText(Build.MANUFACTURER);
            notificationBuilder.setWhen(System.currentTimeMillis());
            notificationBuilder.setSmallIcon(R.mipmap.ic_launcher);
            notificationBuilder.setAutoCancel(true);
            notificationBuilder.setContentIntent(pi);

            Notification notification=notificationBuilder.build();
            notification.ledARGB= Color.GREEN;
            notification.ledOnMS=1000;
            notification.ledOffMS=1000;
            notification.sound= Uri.fromFile(new File("/system/media/audio/ringtones/Basic_tone.ogg"));

            manager.notify(1,notification);

参考链接：http://blog.csdn.net/vipzjyno1/article/details/25248021
http://www.piaoyi.org/mobile-app/Android-setLatestEventInfo-Handler-SimpleDateFormat.html