• FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which means that the View wants to be as big as its parent (minus padding)
•WRAP_CONTENT, which means that the View wants to be just big enough to enclose its content (plus padding)
Either attribute can be applied to View's (visual control) horizontal or vertical size. It's used to set a View or Layouts size based on either it's contents or the size of it's parent layout rather than explicitly specifying a dimension.
fill_parent
(deprecated and renamed MATCH_PARENT in API Level 8 and higher)
Setting the layout of a widget to fill parent will force it to expand to take up as much space as is available within the layout element it's been placed in. It's roughly equivalent of setting the dock style of a Windows Form Control to Fill.
Setting a top level layout or control to fill parent will force it to take up the whole screen.
wrap_content
Setting a View's size to wrap content will force it to expand only far enough to contain the values (or child controls) it contains. For controls -- like text boxes (TextView) or images (ImageView) -- this will wrap the text or image being shown. For layout elements it will resize the layout to fit the controls / layouts added as its children.
It's roughly the equivalent of setting a Windows Form Control's Auto size property to True.
Online Documentation
There's some details in the Android code documentation here
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