These seem to be more than one way to program for the Android devices.
The first and the most common way is by using the Software Development Kit (SDK) using Java Syntax. This is what I have been talking about in all the earlier posts and tutorials.
The other 3 interesting ways, I believe, are:
2. Native Development Kit using C / C ++. This I am sure many are aware of and would be using to some extent. This is a little more closer to the OS, not running on top of the virtual Machine.
3. RenderScript using C99 - used to write faster graphics code like the Google Books page turn animation etc.
4. Android Scripting Layer using Python etc.
Interesting options, right?