clear method
Implementation
@override
void clear() {
_applicationList.clear();
_groupList.clear();
_blockList.clear();
_contactList.clear();
_userStatus.clear();
_friendGroup.clear();
_groupApplicationList.clear();
_searchUserList.clear();
_applicationUnreadCount = 0;
_deleteConversationCode = 0;
_applicationCode = 0;
_applicationUserID = "";
}