public class XXXFragment extends BaseFragment implements XXXClick{
    method(){
        ABC.method(this);
    }
}
public class XXXActivity extends BaseActivity implements XXXClick{
    method(){
        ABC.method(this);
    }
}
XXXFragment 是Fragment的子类；XXXActivity 是Activity的子类
public class ABC{
    method(Object obj){
        if(obj instanceof Activity){
            ...
        }else{
             if(obj instanceof Fragment){
                ...
             }
        }

    }
}