I know many of us here on XDA would like to get into Android development but quickly lose focus with all the conflicting tutorials and guides out there on the internet.
I've joined an online course, a MOOC that helped learn the basics of Android development. It's pretty quick and straightforward, and project centered so you won't get a whole bunch of theoretical lessons and you'll learn by doing.
Here's the link: coursera.org/learn/android-app
I'll be finishing the MOOC soon, so if you have any questions, feel free to ask me.