how to make check box check on button click in different activity in android

in my android app there is terms and condition fragment and in that there are two buttons accept and decline, the scenario is when user click on terms and condition the fragment open and user have two options accept and declined and when he press the accept button it return to main activity and there is one checkbox that should be check when user click on accept button in the fragment,So can anyone tell me how should i do that?