在Android中：如何调用服务的活动功能？ [英] In Android: How to Call Function of Activity from a Service?

问题描述

我有一个活动（A）和服务（S），由A开始，像这样：

I have an Activity (A) and a Service (S) which gets started by A like this:

Intent i = new Intent();
i.putExtra("updateInterval", 10);
i.setClassName("com.blah", "com.blah.S");
startService(i);

A在A中有这样的功能：

A have a function like this one in A:

public void someInfoArrived(Info i){...}

$ b b

现在我想从S.内部调用A.someInfoArrived（i）。
Intent.putExtra没有可以传递对象引用的版本...
请帮助！

Now I want to call A.someInfoArrived(i) from within S. Intent.putExtra has no version where I could pass an Object reference etc ... Please help!

PS：另一种方法（A轮询S的新信息）不是我需要的。我发现了足够的信息，如何做到这一点。

PS: The other way around (A polling S for new info) is NOT what I need. I found enough info about how to do that.

推荐答案

一个选项是从 startService（）切换到 bindService（）并使用本地绑定模式。然后，你需要在S上调用一个方法来注册一个监听器或回调方法。然后，S将有一些东西，当一些信息到达时，它可以调用A。您可以在此处查看示例项目

One option is to switch from startService() to bindService() and use the local binding pattern. Then, you need to have A call a method on S at some point to register a listener or callback method. Then, S will have something it can call on A when some info arrives. You can see a sample project for that here.

或者，您可以留下 startService（），并使用广播 Intent 让S告诉A一些信息到达。您可以看到一个演示此类广播的示例项目 Intent 此处。

Alternatively, you could leave startService() in place and use a broadcast Intent to let S tell A about some info arriving. You can see a sample project demonstrating such a broadcast Intent here.

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