[android-developers] how to show a dialog when a activity is running and game is over ?

I want to show a dialog to ask player "play again ?" when the game is
over.I find the code can only add in a activity for dialog is a part
of activity,But I should show the dialog when the game is over,in
other words ,I should know the time game is over.how can I do this?

any advices or example code with be appreciate.

notenking

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