I would like to review the course “Android Development for Beginners | Udacity”. It is built by Google and offered by Kunal Chawla, Katherine Kuan and Lyla Fujiwara. It is a 4 week course (6hrs per week/ work at your own pace) and is extremely informative.
I had completed the Free version which includes the Instructor videos, Learn by doing exercises and viewing project instructions. The paid enrolled version also includes Projects with reviews, Getting help from Coaches and a Verified Certificate.