Android:如何避免开始已经在堆栈中的活动? [英] Android: How do I avoid starting activity which is already in stack?

问题描述

让我们尝试解释我的问题: 我有一个应用程序和服务. 该应用程序以活动A启动. 该服务发送广播，该广播将使应用程序启动活动B 现在，用户开始活动C.

Lets try to explain my question: I got an application and a service. The application is started with activity A. The service sends a broadcast that will let the application start Activity B Now the user starts activity C.

现在，该服务希望再次开始活动B.但是我如何让他知道活动仍在堆栈中，或者是否有意图标记?

Now the service wants to start activity B again. But how do I let him know that the activity is still on the stack, or is there an intent flag for this?

如何避免由于活动B已经在堆栈中而启动活动B?

How do I avoid that it will launch activity B because its already in the stack?

推荐答案

我认为您需要进行活动B singleInstance，如果活动B已创建，则您不想再创建，即android:launchMode中定义http://developer.android.com/guide/topics/manifest/activity-element.html#lmode"rel =" noreferrer>活动的启动模式，该清单定义了如何活动将被实例化..

I think you need to make your activity B singleInstance that if it's already create you don't want to create again, that is launch mode of the activity can be defined in manifest android:launchMode that defines how the activity will be instanciated.

在您的情况下，请使用android:launchMode="singleInstance"

in your case use android:launchMode="singleInstance"

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