Using the Android Eclipse plugin is the fastest and easiest way
to start creating a new Android application. The plugin automatically generates
the correct project structure for your application, and keeps the resources
compiled for you automatically.
It is still a good idea to know what is going on though. Take a look at
Overview of an Android Application to understand
the basics of how an Android application works.
It is also recommended that you take a look at the
ApiDemos application and the other
sample applications in the samples/ folder in the SDK.
Finally, a great way to started with Android development in Eclipse is to
follow both the Hello Android and
Notepad code tutorials. In particular, the start
of the Hello Android tutorial is an excellent introduction to creating a new
Android application in Eclipse.