Answer 1

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https://www.udemy.com/android-tutorial/

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UPDATES: https://www.udacity.com/courses/android
https://developer.android.com/develop/index.html
http://www.learntocodewith.me/programming/android/beginner-app-development/
https://developer.android.com/training/basics/firstapp/index.html
https://developer.android.com/studio/index.html