只显示如果活动没有显示通知 [英] Show a notification only if Activity is not showing

问题描述

我有一个后台任务，我想处理。问题是，在任务完成时，我想调用一个新的活动显示结果给用户，只有当我的主要活动是展示，否则我想送只是一个通知，使用户可以看到的动作完成，并能够每当他喜欢将其打开。

I have a background task I would like to handle. The thing is that when the task completes, I would like to call a new Activity to show the result to the user, only if my main Activity is showing, otherwise I would like to send just a notification so the user can see that the action completed, and be able to open it whenever he likes.

我在考虑使用一个服务来处理后台任务的开始和终止，并当它完成广播消息的，但在这种情况下，我别无选择知道活动是否被示出或广播没有处理和我应该发送通知。

I was thinking of using a service to handle the start and termination of the background task and broadcast a message when it finishes, but in this case I have no option to know whether the Activity was shown or the broadcast was not processed and I should send a notification.

因此​​，这是我的问题，因为我的知识和后台任务和服务的经验是有限的，我决定寻求帮助。

So this is my problem, and because my knowledge and experience in background tasks and services is limited I decided to ask for some help.

在此先感谢您阅读我的情况下，希望有一定的帮助！

Thanks in advance for reading my case, hope for some help!

推荐答案

下面是一个很好的文章，描述了如何实现你想要的东西：的Activity或通过有序广播的通知。

Here's a good article which describes how to implement what you want: Activity or Notification via Ordered Broadcast.

其主要思想是利用有序的广播。您应该创建一个的BroadcastReceiver 将生活在没有任何活动。为了做到这一点，你应该在的Andr​​oidManifest.xml 文件声明。该接收器将显示一个通知。你也应该注册另一个的BroadcastReceiver 与您的主要活动更高的优先级，这将显示屏幕上的内容。然后你只需要发送一个有序的广播。

The main idea is to use ordered broadcasts. You should create a BroadcastReceiver which will live without any activities. In order to do that you should declare it in the AndroidManifest.xml file. This receiver will show a Notification. Also you should register another BroadcastReceiver with higher priority in your main activity which will display something on the screen. Then you just need to send an ordered broadcast.

这篇关于只显示如果活动没有显示通知的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！