To write a job winning Android Developer resume consider the following:
List your portfolio clearly at the top. It can be your Github, FOSS or any other project you did.
In your experience explain how you implement clean code, follow architectural patterns, your experience with reactive programming, testability of your code and what scale of performance you served.
Adding certifications like Google certified Android developer can help you get entry-level Android roles, but won’t carry the same weight for senior Android roles.