android - FirebaseInstanceIdService onTokenRefresh() 是否仅在应用程序运行时调用？

Question

正如标题所暗示的那样，如果我为 FCM 通知注册了一个 Android 应用程序并且该应用程序在后台运行或有一段时间没有启动并且 token 发生变化，onTokenRefresh()调用？

它会唤醒应用程序以调用 onTokenRefresh() 还是仅在应用程序下次启动时调用？

谢谢

Answer 1

触发onTokenRefresh() 时的事件已包含在FirebaseInstanceIdService documentation 中:

Called when the system determines that the tokens need to be refreshed. The application should call getToken() and send the tokens to all application servers.

This will not be called very frequently, it is needed for key rotation and to handle Instance ID changes due to:

• App deletes Instance ID
• App is restored on a new device
• User uninstalls/reinstall the app
• User clears app data

The system will throttle the refresh event across all devices to avoid overloading application servers with token updates.

另外，FirebaseInstanceIdService 类扩展了 Service类，无论应用程序是在前台还是后台，它都可以运行。