使用BigView风格
最后更新于:2022-04-01 01:43:50
> 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
![fragments-screen-mock](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2015-07-28_55b72476e99f5.png)
图1 Normal view notification.
这是一个 big view的例子
![fragments-screen-mock](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2015-07-28_55b72476f0946.png)
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);
~~~