Accept a friend request

OpenIMClient.getInstance().friendshipManager.acceptFriendApplication(
    new OnBase<String>() {
        @Override
        public void onSuccess(String data) {
            markApplicationAccepted(applicantUserID);
        }

        @Override
        public void onError(int code, String error) {
            recordApplicationAcceptFailure(code, error);
        }
    },
    applicantUserID,
    "Accepted"
);