Метод активности доступа от адаптера
if (mContext instanceof YourActivityName) {
((YourActivityName)mContext).yourDesiredMethod();
Sparkling Salmon
if (mContext instanceof YourActivityName) {
((YourActivityName)mContext).yourDesiredMethod();
if (mContext instanceof YourActivityName) {
((YourActivityName)mContext).yourDesiredMethod();
}