I've done a bit of tinkering with Android - even wrote a
blog post about my experience here. It's not much, but if you want to get into Android builds I'd suggest starting with something like Cordova (phonegap), where you can basically build your whole app in HTML5/CSS and JavaScript and still take advantage of mobile features such as the camera and gyroscope without worrying too much about dealing with the underlying Java and Android SDK.
It also adds a little bonus that you can port your app to iPhone quite easily if you so wish.
I've done some work in comparing and contrasting development platforms so if you want to know more details let me know and I can give you a run-down of the pros and cons of some of the more popular ones.