In order to develop apps for Android you will need a good understanding of Java. Since it sounds like you have some previous programming experience from Code Academy (I used there Python track as a basis for learning Python and it was great), I would recommend checking out this great free course from Udemy, (Free and material is self paced) on the basics of Java development. To move on to Android then I would recommend checking out the official Android developer training and documentation. Also XDA's app development forum section has a wealth of information for Android app development. Let me know if you still have questions.
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