Android Wear 开发入门——怎样创建一个手机与可穿戴设备关联的通知(Notification)

时间:2022-01-12 06:39:39

创建通知

为了创建在手机与可穿戴设备中都能展现的通知,能够使用 NotificationCompat.Builder。通过该类创建的通知,系统会处理该通知是否展如今手机或者穿戴设备中。

导入必要的类库

在开发之前首先须要导入下面类库

importandroid.support.v4.app.NotificationCompat;
importandroid.support.v4.app.NotificationManagerCompat;
importandroid.support.v4.app.NotificationCompat.WearableExtender;

使用Notification Builder创建通知

v4 support library 库同意开发人员使用最新的通知特性,如action button或者large
icons,编译环境须要在4以上。

使用支持库开发的通知,须要创建NotificationCompat.Builder实例,公布通知使用notify(),例如以下代码所看到的:

int notificationId = 001;
// Build intent for notification content
Intent viewIntent = new Intent(this,ViewEventActivity.class);
viewIntent.putExtra(EXTRA_EVENT_ID, eventId);
PendingIntent viewPendingIntent =
PendingIntent.getActivity(this,0, viewIntent,0); NotificationCompat.BuildernotificationBuilder=
new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_event)
.setContentTitle(eventTitle)
.setContentText(eventLocation)
.setContentIntent(viewPendingIntent); // Get an instance of the NotificationManager service
NotificationManagerCompat notificationManager =
NotificationManagerCompat.from(this); // Build the notification and issues it with notification manager.
notificationManager.notify(notificationId,notificationBuilder.build());

当这条通知出如今手机上是,使用者能够指定PendingIntent通过使用setContentIntent()方法触发这条通知,当通知出如今手机中时,使用者何以向左滑动来销毁出现的通知。

加入Action Button

除了定义的setcontentintent()主要内容的行为,你能够通过传递一个PendingIntent到addaction()方法加入其它行动。

比如,以下的代码展示了与上面代码同样类型的通知,可是加入了一个动作在view的上面。

// Build an intent for an action to view a map
Intent mapIntent = new Intent(Intent.ACTION_VIEW);
Uri geoUri = Uri.parse("geo:0,0?q=" + Uri.encode(location));
mapIntent.setData(geoUri);
PendingIntent mapPendingIntent =
PendingIntent.getActivity(this, 0, mapIntent, 0); NotificationCompat.Builder notificationBuilder =
new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_event)
.setContentTitle(eventTitle)
.setContentText(eventLocation)
.setContentIntent(viewPendingIntent)
.addAction(R.drawable.ic_map,
getString(R.string.map), mapPendingIntent);

在手机上,该action是以button形式附加在notification一起,在穿戴设备中,该action是以一个大button形式出现的,当用户单击该button,intent中的内容将在手机中被调起。

指定可穿戴设备独有的行为

假设希望可穿戴设备中的行为有别于手机,使用WearableExtender.addAction().当使用该方法,穿戴设备中将不再展现使用NotificationCompat.Builder.addAction().的行为,也就是仅仅显示其在可穿戴设备中。

// Create an intent for the reply action
Intent actionIntent = new Intent(this, ActionActivity.class);
PendingIntent actionPendingIntent =
PendingIntent.getActivity(this, 0, actionIntent,
PendingIntent.FLAG_UPDATE_CURRENT); // Create the action
NotificationCompat.Action action =
new NotificationCompat.Action.Builder(R.drawable.ic_action,
getString(R.string.label, actionPendingIntent))
.build(); // Build the notification and add the action via WearableExtender
Notification notification =
new NotificationCompat.Builder(mContext)
.setSmallIcon(R.drawable.ic_message)
.setContentTitle(getString(R.string.title))
.setContentText(getString(R.string.content))
.extend(new WearableExtender().addAction(action))
.build();

加入Big View

开发人员能够插入一个Big View形式的内容进入通知,在手机中,用户能够通过展开通知来查看该Big View,在可穿戴设备中,该Big View是默认可见的。

加入这样的可展开的内容作为通知,使用 NotificationCompat.Builder 对象中的setStyle() 方法,传递给实例BigTextStyle 或者 InboxStyle样式。

比如以下代码是加入了BigTextStyle 到通知中。

// Specify the 'big view' content to display the long
// event description that may not fit the normal content text.
BigTextStyle bigStyle = new NotificationCompat.BigTextStyle();
bigStyle.bigText(eventDescription); NotificationCompat.Builder notificationBuilder =
new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_event)
.setLargeIcon(BitmapFractory.decodeResource(
getResources(), R.drawable.notif_background))
.setContentTitle(eventTitle)
.setContentText(eventLocation)
.setContentIntent(viewPendingIntent)
.addAction(R.drawable.ic_map,
getString(R.string.map), mapPendingIntent)
.setStyle(bigStyle);

为通知加入可穿戴设备特性

假设想加入可穿戴设备中特有的特性,如语音输入等,能够使用NotificationCompat.WearableExtender 类,使用该类分下面几步。

1 创建WearableExtender实例,设置可穿戴设备特有的特性

2 创建NotificationCompat.Builder实例,设置如前文所述

3 调用extend()方法,传递给WearableExtender

4 调用build()创建通知

以下代码使用 setHintHideIcon()移除通知卡片中的图标

// Create a WearableExtender to add functionality for wearables
NotificationCompat.WearableExtender wearableExtender =
new NotificationCompat.WearableExtender()
.setHintHideIcon(true); // Create a NotificationCompat.Builder to build a standard notification
// then extend it with the WearableExtender
Notification notif = new NotificationCompat.Builder(mContext)
.setContentTitle("New mail from " + sender)
.setContentText(subject)
.setSmallIcon(R.drawable.new_mail);
.extend(wearableExtender)
.build();

假设想在后面读取特有的特性的值,能够例如以下代码所看到的

NotificationCompat.WearableExtender wearableExtender =
new NotificationCompat.WearableExtender(notif);
boolean hintHideIcon = wearableExtender.getHintHideIcon();

传送通知

当须要传递通知时,使用 NotificationManagerCompat API取代NotificationManager:

// Get an instance of the NotificationManager service
NotificationManagerCompat notificationManager =
NotificationManagerCompat.from(mContext); // Issue the notification with notification manager.
notificationManager.notify(notificationId, notif);

当使用NotificationManager,一些 NotificationCompat.WearableExtender 的特性不能工作

NotificationCompat.WearableExtender wearableExtender =
new NotificationCompat.WearableExtender(notif);
boolean hintHideIcon = wearableExtender.getHintHideIcon();