View navigation

Figure 1. Back button

Summary: Two main navigation structures: Drill down. Category selection. Combining category selection and drill down navigation is possible. No history based navigation.

Java: List CategoryBar

Patterns

Drill down
Figure 2. Drill down structure	User can drill down in application hierarchy. Drill down navigation is usually done with List views; the user chooses the wanted item group, and eventually gets the item details they were looking for. Back navigation is always to the next higher hierarchy level.

Category selection
Figure 3. Category selection structure	Category bar holds categories, not actions. Selecting a category opens that category content, and changes the Category bar highlight to the selected category. Back navigation takes the user out from the application. No history based back navigation.

Category selection + drill down
Figure 4. Category selection + drill down structure	User can drill down from category content. Category bar content is not duplicated to lower hierarchies. Lower hierarchy levels can have their own Category bar with categories related to that level. Back works between hierarchy levels, not between categories (i.e. no history based back navigation).