I want to develop a new Android app. Design guidelines for Droid 3.0+ encourage the use of fragments to create a UI that better utilizes tablets' screen space. Also, from Droid 3.0+ I have read that a menu bar should exist on every activity that has a menu instead of using the plain old menu key
These features are supported by SDK 11+, but I want to support SDK 8 as minimum SDK in order to achieve best market share (see here).
How can I achieve both of my objectives?
You have two possibilities:
Google provide support library for developing apps with using fragments and action bars with support of old android versions.
There is great tool Action Bar Sherlock.