Representing hierarchy in a mobile app

Normally to represent hierarchy of items (parent-child) we use a tree control.

But on mobile devices it may be inconvenient. I have hardly seen any app that shows tree controls. Is there any alternative UI design that can represent hierarchy?

Thanks.

Regards, Gautam Jain

First thing that comes to mind would be like a menu. You would see a list of items and every time you click on one, the list would be replaced by the child list. You could use a back button to move back up the levels. This would make it easy to navigate at the disadvantage of not being able to see the whole structure at one time.