> 编写:[fastcome1985](https://github.com/fastcome1985) - 原文:[http://developer.android.com/training/notify-user/expanded.html](http://developer.android.com/training/notify-user/expanded.html) Notification抽屉中的Notification主要有两种视觉展示形式，normal view（平常的视图，下同） 与 big view（大视图，下同）。Notification的 big view样式只有当Notification被扩展时才能出现。当Notification在Notification抽屉的最上方或者用户点击Notification时才会展现大视图。 Big views在Android4.1被引进的，它不支持老版本设备。这节课叫你如何让把big view notifications合并进你的APP，同时提供normal view的全部功能。更多信息请见[Notifications API guide](#) 。 这是一个 normal view的例子  图1 Normal view notification. 这是一个 big view的例子  图2 Big view notification. 在这节课的例子应用中， normal view 与 big view给用户相同的功能： - 继续小睡或者消除Notification - 一个查看用户设置的类似计时器的提醒文字的方法， - normal view 通过当用户点击Notification来启动一个新的[activity](# "An activity represents a single screen with a user interface.")的方式提供这些特性，记住当你设计你的notifications时，首先在normal view 中提供这些功能，因为很多用户会与notification交互。 ### 设置Notification用来登陆一个新的[Activity](# "An activity represents a single screen with a user interface.") 这个例子应用用[IntentService](#)的子类（PingService）来构造以及发布notification。 在这个代码片段中，[IntentService](#)中的方法[onHandleIntent()](#)) 指定了当用户点击notification时启动一个新的[activity](# "An activity represents a single screen with a user interface.")。方法[setContentIntent()](#))定义了pending intent在用户点击notification时被激发，因此登陆这个[activity](# "An activity represents a single screen with a user interface."). ~~~ Intent resultIntent = new Intent(this, ResultActivity.class); resultIntent.putExtra(CommonConstants.EXTRA_MESSAGE, msg); resultIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK); // Because clicking the notification launches a new ("special") activity, // there's no need to create an artificial back stack. PendingIntent resultPendingIntent = PendingIntent.getActivity( this, 0, resultIntent, PendingIntent.FLAG_UPDATE_CURRENT ); // This sets the pending intent that should be fired when the user clicks the // notification. Clicking the notification launches a new activity. builder.setContentIntent(resultPendingIntent); ~~~ ### 构造big view 这个代码片段展示了如何在big view中设置buttons ~~~ // Sets up the Snooze and Dismiss action buttons that will appear in the // big view of the notification. Intent dismissIntent = new Intent(this, PingService.class); dismissIntent.setAction(CommonConstants.ACTION_DISMISS); PendingIntent piDismiss = PendingIntent.getService(this, 0, dismissIntent, 0); Intent snoozeIntent = new Intent(this, PingService.class); snoozeIntent.setAction(CommonConstants.ACTION_SNOOZE); PendingIntent piSnooze = PendingIntent.getService(this, 0, snoozeIntent, 0); ~~~ 这个代码片段展示了如何构造一个[Builder](#)对象，它设置了big view 的样式为"big text",同时设置了它的内容为提醒文字。它使用[addAction()](#))方法来添加将要在big view中出现的Snooze与Dismiss按钮（以及它们相关联的pending intents). ~~~ // Constructs the Builder object. NotificationCompat.Builder builder = new NotificationCompat.Builder(this) .setSmallIcon(R.drawable.ic_stat_notification) .setContentTitle(getString(R.string.notification)) .setContentText(getString(R.string.ping)) .setDefaults(Notification.DEFAULT_ALL) // requires VIBRATE permission /* * Sets the big view "big text" style and supplies the * text (the user's reminder message) that will be displayed * in the detail area of the expanded notification. * These calls are ignored by the support library for * pre-4.1 devices. */ .setStyle(new NotificationCompat.BigTextStyle() .bigText(msg)) .addAction (R.drawable.ic_stat_dismiss, getString(R.string.dismiss), piDismiss) .addAction (R.drawable.ic_stat_snooze, getString(R.string.snooze), piSnooze); ~~~