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Retrieve Logged In User Details

You can get the details of the logged-in user using the getLoggedInUser() method. This method can also be used to check if the user is logged in or not. If the method returns null, it indicates that the user is not logged in and you need to log the user into CometChat. 
User user = await CometChat.getLoggedInUser()
This method will return a User object containing all the information related to the logged-in user.

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Retrieve List of Users

In order to fetch the list of users, you can use the UsersRequest class. To use this class i.e to create an object of the UsersRequest class, you need to use the UsersRequestBuilder class. The UsersRequestBuilder class allows you to set the parameters based on which the users are to be fetched. The UsersRequestBuilder class allows you to set the below parameters:

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Set Limit

This method sets the limit i.e. the number of users that should be fetched in a single iteration. 
UsersRequest usersRequest = (UsersRequestBuilder()
  ..limit = 50
  ).build();

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Set Search Keyword

This method allows you to set the search string based on which the users are to be fetched. 
UsersRequest usersRequest = (UsersRequestBuilder()
  ..limit = 50
	..searchKeyword = "abc"
  ).build();

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Set Status

The status based on which the users are to be fetched. The status parameter can contain one of the below two values:
  • CometChatUserStatus.online - will return the list of only online users.
  • CometChatUserStatus.offline - will return the list of only offline users.
If this parameter is not set, will return all the available users. 
UsersRequest usersRequest = (UsersRequestBuilder()
  ..limit = 50
	..userStatus = CometChatUserStatus.online
  ).build();
If this parameter is not set, will return all users.

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Hide Blocked Users

This method is used to determine if the blocked users should be returned as a part of the user list. If set to true, the user list will not contain the users blocked by the logged-in user. 
UsersRequest usersRequest = (UsersRequestBuilder()
  ..limit = 50
	..hideBlockedUsers = true
  ).build();

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Set Roles

This method allows you to fetch the users based on multiple roles. 
List<String> roles = [];
roles.add("role1");
roles.add("role2");
UsersRequest usersRequest = (UsersRequestBuilder()
  ..limit = 50
	..roles = roles
  ).build();

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Friends Only

This property when set to true will return only the friends of the logged-in user. 
UsersRequest usersRequest = (UsersRequestBuilder()
  ..limit = 50
	..friendsOnly = true
  ).build();

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Set Tags

This method accepts a list of tags based on which the list of users is to be fetched. The list fetched will only contain the users that have been tagged with the specified tags. 
List<String> tags = [];
tags.add("tag1");
tags.add("tag2");
UsersRequest usersRequest = (UsersRequestBuilder()
  ..limit = 50
	..tags = tags
  ).build();

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With Tags

This property when set to true will fetch tags data along with the list of users. 
List<String> tags = [];
tags.add("tag1");
tags.add("tag2");
UsersRequest usersRequest = (UsersRequestBuilder()
  ..limit = 50
	..withTags = true
  ).build();

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Set UIDs

This method accepts a list of UIDs based on which the list of users is fetched. A maximum of 25 users can be fetched. 
List<String> uids = [];
uids.add("UID1");
uids.add("UID2");
UsersRequest usersRequest = (UsersRequestBuilder()
  ..limit = 25
	..uids = uids
  ).build();
Finally, once all the parameters are set to the builder class, you need to call the build() method to get the object of the UsersRequest class. Once you have the object of the UsersRequest class, you need to call the fetchNext() method. Calling this method will return a list of User objects containing ‘n’ number of users depending on the limit set. 
UsersRequest usersRequest = (UsersRequestBuilder()
  ..limit = 25
  ).build();

usersRequest.fetchNext(onSuccess: (List<User> userList){
    debugPrint("User List Fetched Successfully : $userList");
  },onError: (CometChatException e){
    debugPrint("User List Fetch Failed: ${e.message}");
  });

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Retrieve Particular User Details

To get the information of a user, you can use the getUser() method. 
String UID = "UID";
  
CometChat.getUser(UID, onSuccess: (User user){
    debugPrint("User Fetched Successfully : $user");
  }, onError: (CometChatException e){
    debugPrint("User Fetch Failed: ${e.message}");
  });
The getUser() method takes the following parameters:
ParameterDescription
UIDThe UID of the user for whom the details are to be fetched
On success, the User object containing the details of the user is returned.

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Get online user count

To get the total count of online users for your app, you can use the getOnlineUserCount() method. 
CometChat.getOnlineUserCount(onSuccess: (int count){
    debugPrint("Online User Count: $count"); 
  }, onError: (CometChatException e){
    debugPrint("User Count Fetch Failed: ${e.message}");
  });