What is the difference between File, Class, and Activity in android?

Answer

The difference between them are as follows:

• File is a block of arbitrary information or resources for storing information. It can be any file type.
• Class is a compiled from of .Java file which Android uses to produce an executable apk.
• Activity is the equivalent of a Frame/Window in GUI toolkits. It is not a file or a file type but just a class that can be extended in Android to load UI elements on view.