See the Google IO 2011 App
The ActionBar at the type
It is divided into three sections, with the actions on the right.
There is a separate API
THeme.Holo for SDK 11 or above
You can split an action bar into two levels
Helpful on big screens like a tablet
Stretch, Stack, Expand/Collapse, Show/Hide
You should have the same features in portrait and landscape.
Fragments and Multi-pane
The Fragment Class or Fragment Tag.
These are fragments of an Activity
Unit of reuse between Activities
Separation of concerns
Fragments don't necessarily have views.
Fragments are backward compatible with even 1.0?
drawable-ldpi/mdpi/hdpi is low density, medium density, high density
Activities can inflate layouts with different gragment configurations. You ahve layout-xlarge, layout-medium, etc.
Use CarouselView, but avoid Gallery. Use FragmentPager, Workspace for showing one item at a time.
Everyone uses fragments, but Phones tend to use SessionsActivity, while tablets use SessionsMultiPaneActivity
Phones: 10dp, 18sp, 36dp, Tablets: different sizes.