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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;
    });
}

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
    });
}

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
    });
}

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
    });
}

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
    });
}

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
    });
}

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
    });
}

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);