About
An element state is implemented through a Drawable State List.
A StateListDrawable is a drawable object defined in XML that uses a several different images to represent the same graphic, depending on the state of the object.
See also: bundle stateSavedInstance
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Example
For example, a Button widget can exist in one of several different states:
- pressed,
- focused,
- or neither
and, using a state list drawable, you can provide a different background image for each state.