It works like this:
Items are organized in groups (often by category) in a two-level list. Groups can individually be expanded to show its children. Expandable lists are able to show an indicator beside each item, indicating the current state of the item:
N.B. dependent of the device the indicators are positioned on the right or on the left side of the list item, and pointing in the collapsed state to the right or down.
Expandable lists are useful when you want the user to find the content on the same screen. The content can be grouped in categories covering two levels.
When a group has many child items, consider using a drill down, to prevent extensive scrolling.
- Information can be compared more easy
- A lot of information is on one screen, so scrolling is inevitable
Browser (Samsung Galaxy S)