How clear markDate setOnDateClickListener? #90

Hello, about setOnDateClickListener , it date's listener,
when I chose one day(2021/02/23) and all I want to do is only change text's color,
then if I chose other day(2021/02/24) , I hope 2021/02/23 will unMarked and 2021/02/24 will be Marked.
Thanks