在 Android 中:如何从服务调用活动的功能? [英] In Android: How to Call Function of Activity from a Service?

问题描述

我有一个活动 (A) 和一个由 A 启动的服务 (S)，如下所示:

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 中有这样一个函数:

A have a function like this one in A:

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

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等的版本......请帮忙！

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:另一种方式(轮询 S 获取新信息)不是我需要的.我找到了足够的关于如何做到这一点的信息.

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

一种选择是从 startService() 切换到 bindService() 并使用本地绑定模式.然后，您需要让 A 在某个时刻调用 S 上的方法以注册侦听器或回调方法.然后，当一些信息到达时，S 将有一些可以调用 A 的东西.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，您可以保留 startService() 并使用广播 Intent 让 S 告诉 A 一些信息到达.您可以看到一个示例项目演示了这样的广播 Intent 这里.

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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