Quote (carteblanche @ Oct 15 2016 12:34pm)
tbh if you've worked for 4 years as a java developer you should be able to spend an hour skimming documentation / videos / sample project and determine how hard the transition is yourself.
obviously it'll involve learning the android framework. if you already have a solid understanding of java, it's not a steep learning curve.
This. Programming android IS programming java. You just need to learn about the android lifecycle, transition screens, and you need to learn how design the UI. You can either do that via xml or android studio has a good designer tool.