Context.startForegroundService() 然后没有调用 Service.startForeground() [英] Context.startForegroundService() did not then call Service.startForeground()

问题描述

我在 Android O 操作系统上使用 Service 类.

I am using Service Class on the Android O OS.

我打算在后台使用Service.

Android 文档指出

如果您的应用面向 API 级别 26 或更高级别，系统会对使用或创建后台服务施加限制，除非应用本身处于前台.如果应用需要创建前台服务，应用应调用startForegroundService().

If your app targets API level 26 or higher, the system imposes restrictions on using or creating background services unless the app itself is in the foreground. If an app needs to create a foreground service, the app should call startForegroundService().

如果使用 startForegroundService()，Service 会抛出以下错误.

If you use startForegroundService(), the Service throws the following error.

Context.startForegroundService() did not then call
Service.startForeground() 

这是怎么回事?

推荐答案

来自 Google 在 Android 8.0 行为变化:

From Google's docs on Android 8.0 behavior changes:

即使应用程序在后台，系统也允许应用程序调用 Context.startForegroundService().但是，应用程序必须在服务创建后的五秒内调用该服务的 startForeground() 方法.

The system allows apps to call Context.startForegroundService() even while the app is in the background. However, the app must call that service's startForeground() method within five seconds after the service is created.

解决办法:在 onCreate() 中为您使用的 Service 调用 startForeground() Context.startForegroundService()

Solution: Call startForeground() in onCreate() for the Service which you use Context.startForegroundService()

另请参阅:后台执行限制，适用于 Android 8.0 (Oreo)

See also: Background Execution Limits for Android 8.0 (Oreo)

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