安卓：我怎样才能获得当前的前台活动（从服务）？ [英] Android: How can I get the current foreground activity (from a service)?

问题描述

有没有一种原生的Andr​​oid方式来获得一个服务的引用，当前运行的活动？

我在后台运行的服务，我想，当一个事件发生时（在服务）来更新我的当前活动。有没有一种简单的方法来做到这一点（如我上述建议）？

解决方案

  

有没有一种原生的Andr​​oid方式来获得一个服务的引用，当前运行的活动？

您可能没有自己的当前正在运行的活动。

  

我在后台运行的服务，我想，当一个事件发生时（在服务）来更新我的当前活动。有没有一种简单的方法来做到这一点（如我上述建议）？

1. 发送广播意图的活动 - 的这里是证明这个模式
2. 有活动提供一个 PendingIntent （例如，通过 createPendingResult（）），该服务调用
3. 有活动通过注册服务的回调或侦听器对象bindService（），并有服务调用的回调/监听器对象上的事件方法
4. 发送有序广播意图的活动，具有低优先级的的BroadcastReceiver 备份（提高一通知如果该活动没有在屏幕上） - 的这里是一个博客帖子有更多关于这个模式

Is there a native android way to get a reference to the currently running Activity from a service?

I have a service running on the background, and I would like to update my current Activity when an event occurs (in the service). Is there a easy way to do that (like the one I suggested above)?

解决方案

Is there a native android way to get a reference to the currently running Activity from a service?

You may not own the "currently running Activity".

I have a service running on the background, and I would like to update my current Activity when an event occurs (in the service). Is there a easy way to do that (like the one I suggested above)?

1. Send a broadcast Intent to the activity -- here is a sample project demonstrating this pattern
2. Have the activity supply a PendingIntent (e.g., via createPendingResult()) that the service invokes
3. Have the activity register a callback or listener object with the service via bindService(), and have the service call an event method on that callback/listener object
4. Send an ordered broadcast Intent to the activity, with a low-priority BroadcastReceiver as backup (to raise a Notification if the activity is not on-screen) -- here is a blog post with more on this pattern

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