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Description

Following feature allows users to follow other users they are interested in, so they can timely receive the latest news, feeds, or event information of these users. The system can provide personalized content recommendations based on the user's following list.
Followers feature refers to the state of a user being followed by others. When user A follows user B, A becomes a follower of B. Users can view the count of followers, followers list, or profile of followers on their own profile page.
Through the features, you can create an active, interconnected user network, promoting the spread of information and the building of the community.
Note:
This feature is available only in SDK v7.8 or later.
This feature is only supported by the premium edition. Please purchase the premium edition to use it.

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API Description

Follow user

You can call the followUser API to follow specified users.
Sample code:
V2TimValueCallback<List<V2TimFollowOperationResult>> followResults = await friendshipManager.followUser(userIDList: ['user1']);
if (followResults.code == 0) {
    // Follow users successfully
    followResults.data?.forEach((element) {
        element?.userID;
        element?.resultCode;
        element.resultInfo;
    });
}
Note:
This API supports following up to 20 users at a time (excluding yourself, you can follow any other user).
The maximum number of followers per user is 5000, and there is no limit on the number of fan users.

Unfollow user

You can call the unfollowUser API to unfollow the specified users.
Sample code:
V2TimValueCallback<List<V2TimFollowOperationResult>> unfollowResults = await friendshipManager.unFollowUser(userIDList: ['user1']);
if (unfollowResults.code == 0) {
        // Unfollow users successfully
        unfollowResults.data?.forEach((element) {
        element?.userID;  // User ID
        element?.resultCode;  // Operation result code
        element?.resultInfo;  // Operation result information
    });
}
Note: This API supports unfollowing up to 20 users at a time.

Get my following list

You can use the getMyFollowingList API to pull the list of users you are following.
Sample code:
V2TimValueCallback<V2TimUserInfoResult> userInfoListRes = await friendshipManager.getMyFollowingList(nextCursor: "");
if (userInfoListRes.code == 0) {
    // Get following list successfully
    userInfoListRes.data?.nextCursor;  // The next cursor for paging pull
    userInfoListRes.data?.userFullInfoList?.forEach((element) {
        element?.userID;  // User ID
        element?.nickName;  // User nick name
        element?.faceUrl;  // User avatar url
        element?.selfSignature;  // User signature
        element?.gender;  // User gender
        element?.allowType;  // User option for allowing others to add friends
        element?.customInfo;  // User coustom info
        element?.role;  // User role
        element?.level;  // User level
        element?.birthday;  // User birthday
    });
}
Note:
This API returns a maximum of 500 users at a time.
When pulling the API for the first time, you can enter the nextCursor parameter of the API as "". If the returned nextCursor is not "" after the callback is successful, you can pass this value and pull it again until nextCursor returns "", indicating that the pull is complete.

Get my followers list

You can use the getMyFollowersList API to fetch your own list of follower users.
Sample code:
V2TimValueCallback<V2TimUserInfoResult> userInfoListRes = await friendshipManager.getMyFollowersList(nextCursor: "");
if (userInfoListRes.code == 0) {
    // Get followers list successfully
    userInfoListRes.data?.nextCursor;  // The next cursor for paging pull
    userInfoListRes.data?.userFullInfoList?.forEach((element) {
        element?.userID;  // User ID
        element?.nickName;  // User nick name
        element?.faceUrl;  // User avatar url
        element?.selfSignature;  // User signature
        element?.gender;  // User gender
        element?.allowType;  // User option for allowing others to add friends
        element?.customInfo;  // User coustom info
        element?.role;  // User role
        element?.level;  // User level
        element?.birthday;  // User birthday
    });
}
Note:
This API returns a maximum of 500 users at a time.
For the first fetch, you can fill the nextCursor parameter of the API with "". After a successful callback, if the returned nextCursor is not "", you can input this value to fetch again, until nextCursor returns "", indicating that the fetch is complete.

Get mutual followers list

You can call the getMutualFollowersList API to pull the list of users who mutually follow each other (Users who mutually follow can find each other in their following and followers lists).
Sample code:
V2TimValueCallback<V2TimUserInfoResult> userInfoListRes = await friendshipManager.getMutualFollowersList(nextCursor: "");
if (userInfoListRes.code == 0) {
    // Get mutual followers list successfully
    userInfoListRes.data?.nextCursor;  // The next cursor for paging pull
    userInfoListRes.data?.userFullInfoList?.forEach((element) {
        element?.userID;  // User ID
        element?.nickName;  // User nick name
        element?.faceUrl;  // User avatar url
        element?.selfSignature;  // User signature
        element?.gender;  // User gender
        element?.allowType;  // User option for allowing others to add friends
        element?.customInfo;  // User coustom info
        element?.role;  // User role
        element?.level;  // User level
        element?.birthday;  // User birthday
    });
}
Note:
This API returns a maximum of 500 users at a time.
For the first fetch, you can fill the nextCursor parameter of the API with "". After a successful callback, if the returned nextCursor is not "", you can input this value to fetch again, until nextCursor returns "", indicating that the fetch is complete.

Get the count of following/followers/mutual followers

You can call the getUserFollowInfo API to get the count of following/followers/mutual followers for specific users.
Sample code:
V2TimValueCallback<List<V2TimFollowInfo>> userFollowInfoListRes = await friendshipManager.getUserFollowInfo(userIDList:  ['user1']);
if (userFollowInfoListRes.code == 0) {
    // Obtained successfully
    userFollowInfoListRes.data?.forEach((element) {
        element?.resultCode;  // Result code: 0 indicates success, while any other value indicates failure
        element?.resultInfo;  // Result information
        element?.userID;  // User ID
        element?.followingCount;  // The count of users this user is following
        element?.followersCount;  // The count of followers for this user
        element?.mutualFollowersCount;  // The count of mutual followers for this user
    });
}

Check follow type

You can call the checkFollowType API to check your following relationship with specified users.
In the successful callback, you can obtain your relationship with the specified user through the followType of V2TimFollowTypeCheckResul:
V2TimFollowTypeCheckResult.followType
Relationship with yourself

V2TIM_FOLLOW_TYPE_NONE = 0

No following relationship

V2TIM_FOLLOW_TYPE_IN_MY_FOLLOWING_LIST = 1

The user is only in my following list

V2TIM_FOLLOW_TYPE_IN_MY_FOLLOWERS_LIST = 2

The user is only in my followers list

V2TIM_FOLLOW_TYPE_IN_BOTH_FOLLOWERS_LIST = 3

Mutually follow with the user (the user is both in my following list and in my followers list)
Sample code:
V2TimValueCallback<List<V2TimFollowTypeCheckResult>> followTypeCheckRes = await friendshipManager.checkFollowType(userIDList:  ['user1']);
if (followTypeCheckRes.code == 0) {
    // Checked the follow relationship successfully
    followTypeCheckRes.data?.forEach((element) {
        element?.resultCode;  // Result code: 0 indicates success, while any other value indicates failure
        element?.resultInfo;  // Result information
        element?.userID;  // User ID
        element?.followType;  // Type of following relationship
    });
}
Note:
The frequency limit of checkFollowType API is up to 20 calls within 5 seconds, and each call can support up to 100 users.

Notifications

The specific list change notifications are as follows:
List Change Notification
Description
Follow List Change Notification
onMyFollowingListChanged
When the isAdd in the notification is true, it signifies a notification for adding a user to the list, and at this time, the complete user profile is returned
When the isAdd in the notification is false, it signifies a notification for deleting a user from the list, and at this time, only the user ID is included in the returned user profile
Followers List Change Notification
onMyFollowersListChanged
Mutual Followers List Change Notification
onMutualFollowersListChanged
Note:
To receive notifications for the aforementioned events, please call addFriendListener beforehand to add a relationship event listener.

Notifications of adding users to a list

Suppose there are two users Alice and Bob. During the process of mutual following, the related list change notifications and relationship changes are as follows:
Event
Alice
Bob
Notifications received
Relationship with Bob
Notifications received
Relationship with Alice
Alice follows Bob
Follow
Follower
Bob follows Alice


Notifications of deleting users from a list

Assuming there are two users, Alice and Bob, who are mutual followers, during the process of mutually unfollowing, the related list change notifications and relationship changes are as follows:
Event
Alice
Bob
Notifications received
Relationship with Bob
Notifications received
Relationship with Alice
Alice unfollows Bob

Follower

Follow
Bob unfollows Alice
Sample code:
V2TimFriendshipListener listener = V2TimFriendshipListener(
    OnMyFollowingListChanged: (List<V2TimUserFullInfo> userInfoList, bool isAdd) async {
       if (isAdd) {
            // Receive notification of users added to following list
        } else {
            // Receive notification of users deleted from following list
        }
    },
    OnMyFollowersListChanged: (List<V2TimUserFullInfo> userInfoList, bool isAdd) async {
        if (isAdd) {
            // Receive notification of users added to followers list
        } else {
            // Receive notification of users deleted from followers list
        }
    },
    OnMutualFollowersListChanged: (List<V2TimUserFullInfo> userInfoList, bool isAdd) async {
        if (isAdd) {
            // Receive notification of users added to  mutual followers list
        } else {
            // Receive notification of users deleted from mutual follow list
        }
    }

    // Other member functions ...
);

// Add a relationship chain listener
TencentImSDKPlugin.v2TIMManager.getFriendshipManager().addFriendListener(listener: listener);

// Remove a relationship chain listener
friendshipManager.removeFriendListener(listener : friendshipListener);

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