使用BigView样式
编写:fastcome1985 - 原文: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
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。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.
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);
