xml - clickable and unclickable button android Studio -


this screenshot of appi making small application , want do: every time click on "+" button, want increment counter have done. every time click "-" button, want decrement counter again, have done. however, when value of counter reaches 0, want button "-" no longer clickable , greyed out, how able this?

what can in oncreate method 

button fewer=(button)findviewbyid(r.id.fewer);

and can use .setclickable(false);


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