Android development isn’t really that hard.
For the past 8 months I’ve been studying and practicing android development and it hasn’t been neither too easy and neither too difficult.
How should I study?
In those 8 months I could developed around 4–5 apps. I started learning Java and basic Object Oriented programming. It was hard to understand at first but then you get the hang of it. I recommend studying 2–3 hours a day.
I started learning through Udacity, FreecodeCamp, Platzi, Coursera and other platforms.
Learning is great. You just need to have passion.