chore: update to androidx , update gradle file sdk to 28#45

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mohamedagamy wants to merge 2 commits intothe-blue-alliance:masterfrom mohamedagamy:master

+209-136

Commits on Jul 25, 2019

chore: update to androidx , update gradle file sdk to 28
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committed
refactor: make function that save selection in sharedprefs and retrieve it.
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committed