升级到 Android 8.1 后 startForeground 失败

本文介绍了升级到 Android 8.1 后 startForeground 失败的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

将我的手机升级到 8.1 Developer Preview 后，我的后台服务无法正常启动.

After upgrading my phone to 8.1 Developer Preview my background service no longer starts up properly.

在我长期运行的服务中，我实现了一个 startForeground 方法来启动在创建时调用的正在进行的通知.

In my long-running service I've implemented a startForeground method to start the ongoing notification which is called in on create.

@TargetApi(Build.VERSION_CODES.O) private fun startForeground() { // Safe call, handled by compat lib. val notificationBuilder = NotificationCompat.Builder(this, DEFAULT_CHANNEL_ID) val notification = notificationBuilder.setOngoing(true) .setSmallIcon(R.drawable.ic_launcher_foreground) .build() startForeground(101, notification) }

错误信息:

11-28 11:47:53.349 24704-24704/$PACKAGE_NAMEE/AndroidRuntime: FATAL EXCEPTION: main Process: $PACKAGE_NAME, PID: 24704 android.app.RemoteServiceException: Bad notification for startForeground: java.lang.RuntimeException: invalid channel for service notification: Notification(channel=My channel pri=0 contentView=null vibrate=null sound=null defaults=0x0 flags=0x42 color=0x00000000 vis=PRIVATE) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1768) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loop(Looper.java:164) at android.app.ActivityThread.main(ActivityThread.java:6494) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

服务通知的无效频道，显然我的旧频道 DEFAULT_CHANNEL_ID 不再适用于我假设的 API 27.什么是合适的渠道?我试图查看文档

invalid channel for service notification, apparently my old channel the DEFAULT_CHANNEL_ID is no longer appropriate for API 27 I assume. What would be the proper channel? I've tried to look through the documentation

推荐答案

在对不同的解决方案进行了一段时间的修补后，我发现必须在 Android 8.1 及更高版本中创建通知渠道.

After some tinkering for a while with different solutions i found out that one must create a notification channel in Android 8.1 and above.

private fun startForeground() { val channelId = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { createNotificationChannel("my_service", "My Background Service") } else { // If earlier version channel ID is not used // developer.android/reference/android/support/v4/app/NotificationCompat.Builder.html#NotificationCompat.Builder(android.content.Context) "" } val notificationBuilder = NotificationCompat.Builder(this, channelId ) val notification = notificationBuilder.setOngoing(true) .setSmallIcon(R.mipmap.ic_launcher) .setPriority(PRIORITY_MIN) .setCategory(Notification.CATEGORY_SERVICE) .build() startForeground(101, notification) } @RequiresApi(Build.VERSION_CODES.O) private fun createNotificationChannel(channelId: String, channelName: String): String{ val chan = NotificationChannel(channelId, channelName, NotificationManager.IMPORTANCE_NONE) chan.lightColor = Color.BLUE chan.lockscreenVisibility = Notification.VISIBILITY_PRIVATE val service = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager service.createNotificationChannel(chan) return channelId }

据我所知，后台服务现在显示为普通通知，然后用户可以通过取消选择通知渠道来选择不显示.

From my understanding background services are now displayed as normal notifications that the user then can select to not show by deselecting the notification channel.

更新:另外不要忘记根据Android P的要求添加前台权限:

Update: Also don't forget to add the foreground permission as required Android P:

<uses-permission android:name="android.permission.FOREGROUND_SERVICE" />