singleTask or singleInstance in games - Android

My question is really short. I have a game which has a reset class that resets all the objects. If I understand it correctly I only need one instance of the game activity at the same time. Since if Android created multiple instances of the activity it would be a waste of resources.

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Is the changing of launchMode in Android a way to achieve this. Is it safe to use launchMode="singleInstance" to achieve this?

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Check out the answer at Android singleTask or singleInstance launch mode? - which does a good job if explaining the documentation and refers on to an excellent blog / android app (at http://blog.akquinet.de/2010/02/17/android-activites-and-tasks-series-an-introduction-to-androids-ui-component-model/).

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I am not sure what launchMode="singleInstance" does, but you could achieve what you are trying to do by using the Singleton Pattern:

http://www.javabeginner.com/learn-java/java-singleton-design-pattern

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I think singleTop is what you are looking for. singleTask and singleInstance should only be used in rare cases.

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If i'm right, singleTop will do the thing only if you have only 1 Activity so it's always on the top of the stack. Otherwise you can try to use Intent.FLAG_ACTIVITY_REORDER_TO_FRONT flag while sending an intent.