selector is not working

Question

I uses its selection for the list

Answer 1

a selector is a 'state-list-drawable', ie it 'selects' depending upon the state of the view it is applied to.

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. For example, a Button widget can exist in one of several different states (pressed, focused, or niether) and, using a state list drawable, you can provide a different background image for each state.

Here is the syntax, as in the docs :

notice the attributes you can set in the the .

here is an example of a typical selector..