UX Design for Mobile Developers: Learn to Design a 5-Star Android App is an Udacity course about how to design your user experience for Android apps.
The course page suggest 6 weeks with about 6 hours per week.
Personally, I took the course in about 3 hours, but I mostly avoided using Prezi for the assignments. Prezi is used on the course to design cute boxes with the persona, their attributes, use cases and flows (how a user would perform a use case in the app). It looks like it would be lovely to wireframe the whole app and share with your team or clients, but for the flows it is actually used in the course, I think it is a whole lot simpler and faster to just use text.
I also had a rather simple app in mind for some of the assignments – a STG FolderPrint Plus extension for Android (yes, I realize for most people this doesn't make sense, I'd love to have a decent file catalog of my phone I can easily view and some people actually asked for it in the last survey). For anyone interested, I plan on making it for FPP 5.0, eventually.
There were some useful stuff in the course. They cover personas, use cases, several concrete ways to improve user flow (such as dropping forms entirely when possible) and the important constraints for mobile design.
The thing is, last year I saw another course that covered most of this elements and much more – App Making: Designing & Marketing Successful Apps (not an affiliate link).
So effectively, what I learned in this course was fairly minimal. I was really hoping for more of best practices UI coverage of examples.
Overall, not bad for a free course, but if you'd like more on how to design and market your apps, App Making: Designing & Marketing Successful Apps (not an affiliate link) is a much better resource – but you will pay for the difference.
PS: The course videos supported speeding up (1.25x feels great) and the closed captions are near perfect. Udacity also has an iOS/Android app, but it lacks those features on iOS so I didn't use it.