Jijiji ...... how to judge an Activity is not in operation? ? ?

As the title ...... I have a timer, 10 seconds to start an Activity, and now want to determine, if not then, then you start running, if not running, then it starts Activity. All starts with an Activity.

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Activity attributes that you set in AndroidManifest.xml inside: android: launchMode = "singleInstance"
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You're running, it should be activity in the foreground it
By ActivityManager of getRunningTasks, the first task of the judge is not what you are looking for topActivity activity can
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reference to the second floor of the reply:

you say running, should be the activity in the foreground it
By ActivityManager of getRunningTasks, the first task of the judge is not what you are looking for topActivity activity can

+1
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cited a floor reply:

Activity attributes that you set in AndroidManifest.xml inside: android: launchMode = "singleInstance"

+1 Do not forget to add permissions XML inside oh
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Nothing their play ......
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There is a better way ah, isTaskRoot () This method is to determine the activity is not in the top level