Flutter | Create a list view with application users

create_channel_view.dart

Widget body(BuildContext context) {
return ListView.builder(
    itemCount: _availableUsers.length,
    itemBuilder: (context, index) {
      User user = _availableUsers[index];
      return CheckboxListTile(
        title: Text(user.nickname.isEmpty ? user.userId : user.nickname,
            style: TextStyle(color: Colors.black)),
        controlAffinity: ListTileControlAffinity.platform,
        value: _selectedUsers.contains(user),
        // value: SendbirdSdk().currentUser.userId == user.userId,
        activeColor: Theme.of(context).primaryColor,
        onChanged: (bool value) {
          // Using a set to store which users we want to create
          // a channel with.
          setState(() {
            if (value) {
              _selectedUsers.add(user);
            } else {
              _selectedUsers.remove(user);
            }
            print(
                'create_channel_view: on change for: ${user.nickname} _selectedUsers: $_selectedUsers');
          });
        },
        secondary: user.profileUrl.isEmpty
            ? CircleAvatar(
                child: Text(
                (user.nickname.isEmpty ? user.userId : user.nickname)
                    .substring(0, 1)
                    .toUpperCase(),
              ))
            : CircleAvatar(
                backgroundImage: NetworkImage(user.profileUrl),
              ),
      );
    });
}