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Learn Android application development by Video Tutorials. Please visit http://webtech-training.blogspot.in/2013/12/learn-android-development-ba...
There are many online tutorials available online for free to learn how to build a mobile app. As a mobile app developer, i'm taking this oppertunity to sahre the link where I found many online sites to learn about mobile application. Please use the below link
Here you will get many tutorial links where you can learn about building android and iPhone apps. Thansk for this question as I get an opportunity to help many beginners.
I think Treehouse is great. They have a lot of resources available to users, and are a good place to start. It isn't free, but I do think that you get what you pay for with Treehouse.
Codecademy might be of interest to you as well to hone your Java skills, plus as far as I know Codecademy is free.
I know this sounds like a public service announcement, but you might also want to check your local library. I prefer having a book for reference most of the time.