Change food details title to "Edit food details" when editing food. FoodDbAdapter is now created in the main activity to avoid re-creating it every time the "All foods" tab is activated.
Added up navigation from the FoodDetails activity. Also changed launchMode to "singleTop" to prevent re-creating the main activity. Changed food details OK button to "save" when editing food details.
Now supports removal of items. Replaced Cancel button with Remove button.
Moved remove button to menu.