Although Fragments have been part of the Android API for nearly three years, I find that developers still often struggle to understand their value and purpose.
A common explanation of Fragments, and one I sometimes even use myself, is:
Fragments group user interface components and their associated logic.
That explanation is accurate. However, if someone is struggling with how to apply Fragments in a practical sense, that explanation is about as useful as teaching someone how to tell time by explaining the finer details of Swiss watch construction … sometimes you just want to know what time it is…