我正在玩Wear OS上的通知,并在使用Android API 28的Fossil Falster 3上进行测试。
为什么在一个独立的应用程序中,以下通知没有被触发。谷歌文档.
button_in.setOnClickListener {
val notificationId = 1
// The channel ID of the notification.
val id = "my_channel_01"
// Build intent for notification content
val viewPendingIntent = Intent(this, MainActivity::class.java).let { viewIntent ->
PendingIntent.getActivity(this, 0, viewIntent, 0)
}
// Notification channel ID is ignored for Android 7.1.1
// (API level 25) and lower.
val notificationBuilder = NotificationCompat.Builder(this, id)
.setLocalOnly(true)
.setSmallIcon(R.drawable.ic_launcher_foreground)
.setContentTitle("TITLE")
.setContentText("TEXT")
.setContentIntent(viewPendingIntent)
NotificationManagerCompat.from(this).apply {
notify(notificationId, notificationBuilder.build())
}
Log.d(TAG, "button was pressed!")
}
我可以看到 "按钮被按下!"的文字,但我没有收到任何通知。
Watch应用需要一个通知通道,不像Android应用这样工作。
在你的代码中。val notificationId = 1
指的是通知通道ID。
您可以构建一个 NotificationChannel
并像这样注册。
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
// Create the NotificationChannel
val name = getString(R.string.channel_name)
val descriptionText = getString(R.string.channel_description)
val importance = NotificationManager.IMPORTANCE_DEFAULT
val mChannel = NotificationChannel(1, name, importance) // 1 is the channel ID
mChannel.description = descriptionText
// Register the channel with the system; you can't change the importance
// or other notification behaviors after this
val notificationManager = getSystemService(NOTIFICATION_SERVICE) as NotificationManager
notificationManager.createNotificationChannel(mChannel)
}
注意在注释的代码中,在 val mChannel = ...
,你可以看到第一个参数值 1
指的是通道ID,正如您在上位机中的代码所指定的那样。
你可以在这里阅读更多关于通知渠道的内容。https:/developer.android.comtrainingnotify-userchannels。