posted 14 years ago
Gingerbread mostly adds new UI metaphors and performance improvements. In some cases, such as with the use of sensors and media, there are several new features in Gingerbread. For example Gingerbread now allows you to support multiple cameras, video chat would be one use case, were previous versions did not. They have also made the complete transition to a new media player and we document these changes.
As for Flex, HTML 5, etc we do not specifically cover Flex but Adobe has some great articles on working with AIR, HTML, and Flex on Android. As for HTML 5 Frank wrote a great chapter on build web applications in the book. I hope that helps.
Cheers,
Robi