Book websitesFor all matters related to the technical content of Java Programming for Android Developers For Dummies, 2nd Edition, visit www.allmycode.com/Java4Android.
For business issues (for example, “How can I purchase 100 copies of Java Programming for Android Developers For Dummies, 2nd Edition?”), simply go to Dummies.com and type Java programming for Android developers in the Search box.
The horse's mouthSome information is just best from the horse’s mouth. Give these a try.
Oracle's official website for Java is a good resource.
Programmers and developers interested in sharing Java technology can go to Java’s website.
If you are an Android developer, go to Android’s Developer site for everything you need to know.
Finding news and reviewsFor the latest info about Android, visit Android Authority.
For discussions by everyone (including many very smart people), visit JavaRanch.
Check it out!