问题描述

FirebaseMessagingService 是否像 IntentService 一样在后台运行?

Does the FirebaseMessagingService run in the background similar to how an IntentService operates?

我看到 FirebaseMessagingService 范围 Service 不在后台运行，但我想确定我是否应该在FirebaseMessagingService 异步或同步.

I see that FirebaseMessagingService extents Service which does not run in the background, but I'd like to be sure whether or not I should be doing any work inside the FirebaseMessagingService asynchronously or synchronously.

谢谢

回答:

FirebaseMessagingService 的方法 onMessageReceived(RemoteMessage message) NOT 在主线程上调用 - 所以所有工作都应该同步进行.

FirebaseMessagingService's method onMessageReceived(RemoteMessage message) is NOT called on the main thread - so all work should be synchronously.

推荐答案

FirebaseMessagingService 的方法 onMessageReceived(RemoteMessage message) 被在后台"调用(不在UI/主线程).如果您尝试在 onMessageReceived(RemoteMessage message) 中进行异步工作，您将收到一条错误消息:

FirebaseMessagingService's method onMessageReceived(RemoteMessage message) is called "in the background" (not on the UI/Main thread). If you try do asynchronous work inside onMessageReceived(RemoteMessage message) you will receive an error saying:

方法execute必须从主线程调用，当前推断线程为worker.

Method execute must be called from the main thread, currently inferred thread is worker.

所以在 onMessageReceived(RemoteMessage message) 内完成的所有工作都应该同步完成，因为它在自己的后台工作线程中.

So all work that is done within onMessageReceived(RemoteMessage message) should be done synchronously because it's in its own background worker thread.

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