Obviously, this book does not cover everything. And while your primary resource (besides the book) is the Android SDK documentation, you are likely to need information from additional sources.
Searching online for "android" and a class name is a good way to locate tutorials that reference a given Android class. However, bear in mind that tutorials written before late August 2008 are probably written for the M5 SDK and, as such, will require considerable adjustment to work properly in current SDKs.
Instead of randomly hunting around for tutorials, you can use some of the resources outlined in this chapter to narrow your search.
The official places to get assistance with Android ...