how to use google play services with multiple Activities

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http://stackoverflow.com – I have been reading lots of material to understard how to implement signin Leaderboard and Achievements into my simple game. The Base Game Activity used from google-play-services sample make use of fragments, it does not support multiple activities. when signed in i just want to submit score from my last activity to Leaderboards when submit score is clicked and get leaderboards when Show Leaderboards button is clicked. Same with achievements. pls pls pls someone show me the simplest way pissible to do it. il be extreamly thankful to u. (HowTos)