Access single xml file using different activity in android -

Access single xml file using different activity in android -

now develop multiplayer (in single device) game , countdown timer seperatly. game have 1 activity , 1 xml,and countdown timer have 1 activity , 1 xml. want add together timer within game , in new project design new xml file containing game board , timer.how access single xml file using game activity , countdown timer activity?

android-layout android-intent