Presentation topics on Android (urgent)

Hello guys,
I am sorry for posting wrong question here but i have a class presentation on Android and i cannot find something good to talk about. Can you guys please suggest me some good topic on Android which i can show some code about during the presentation and it would make like a 10-15 mins talk. We are working on Android project in that class so it also requires some topic that everyone is not really familiar with.

Thank you all in advance
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