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Flutter

Feature Description
A community is a large group of people brought together by common topics, and multiple topics can be created under the same community based on different interests.
Community groups are used to manage group members. All topics under the same community group are shared among members, who can send and receive messages within each topic independently.
See use cases of community groups here.
Community and topic management APIs are in the TencentImSDKPlugin.v2TIMManager.getGroupManager() core class.
Topic message APIs are in the TencentImSDKPlugin.v2TIMManager.getMessageManager() core class.
Note: 
 This feature is supported by Flutter SDK v4.0.0 or later. To use it, you need to purchase the Ultimate edition, go to the console, choose Feature Configuration > Group configuration > Group feature configuration > Community, and enable the community feature.
Community Group Management
Creating a community group
Call the createCommunity (Details) API to create the community group.
Sample code:
// Create a topic-enabled community
final info = V2TimGroupInfo(
  groupID: "",
  groupType: GroupType.Community,
  isSupportTopic: true,
  groupName: "testGroup",
);
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await TencentImSDKPlugin.v2TIMManager.getCommunityManager().createCommunity(
  info: info,
  memberList: memberList,
);
Getting the list of community groups joined
You can call getJoinedCommunityList(Details) to get the list of community groups joined.
Sample code:
// Getting the list of community groups joined
V2TimValueCallback<List<V2TimGroupInfo>> groupList = await TencentImSDKPlugin.v2TIMManager.getCommunityManager().getJoinedCommunityList();
Other management APIs
Other features can be used in the same way as an ordinary group feature and involve the following APIs:
Category
Feature
API
Community group management
Joining a group
joinGroup (dart)
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Leaving a group
quitGroup (dart)
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Disbanding a group
dismissGroup (dart)
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Getting the group profile
getGroupsInfo (dart)
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Modifying the group profile
setGroupInfo (dart)
Community group member management
Getting the group member list
getGroupMemberList (dart)
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Getting the profile of a group member
getGroupMembersInfo (dart)
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Modifying the profile of a group member
setGroupMemberInfo (dart)
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Removing a group member
kickGroupMember (dart)
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Topic Management
Multiple topics can be created under the same community group. All the topics are shared among group members, who can send and receive messages within each topic independently.
Note: 
To use the feature, you need to go to the console, choose Feature Configuration > Group configuration > Group feature configuration > Community, enable the community feature and then enable the topic feature.
Creating a topic
You need to perform two steps to create a topic:
1. Create a V2TIMTopicInfo (Details) object.
2. Call the createTopicInCommunity (Details) API to create a topic.
Sample code:
// Create a topic
communityManager.createTopicInCommunity(groupID: "groupID", topicInfo: V2TimTopicInfo.fromJson({
    "topicName":"topic"
}));
Deleting a topic
You can call the deleteTopicFromCommunity(Details) API to delete a topic.
Sample code:
// Delete a topic
communityManager.deleteTopicFromCommunity(groupID: "",topicIDList:["topicID"]);
Modifying topic information
You need to perform two steps to modify the information of a topic:
1. Create a V2TIMTopicInfo (Details) object and modify fields as needed.
2. Call the setTopicInfo (Details) API to modify topic information.
Sample code:
// Modify topic information
communityManager.setTopicInfo(topicInfo:V2TimTopicInfo.fromJson({
    "topicName":"topicName"
}));
Getting the topic list
You can call the getTopicInfoList (Details) API to get the topic list.
If topicIDList is an empty array, the list of all topics of the community group will be got.
If topicIDList is the ID of specified topics, the list of the specified topics will be got.
Sample code:
// Get the topic list
groupManager.getTopicInfoList(groupID: "",topicIDList: ['topicID']);
Topic groups
The community is a new powerful tool for entertainment collaboration and supports the community-group-topic hierarchy to isolate messages.
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The customInfo of a community saves the topic group list of the community, while the customString field of each topic stores the topic group.
When a community is loaded, the customInfo field for the topic group list of the community (group) is used to display the group list. We recommend you store the field in the List<String> format.
To get the topics in each group, traverse the topic list and get the group of each topic through the customString of V2TimTopicInfo.
Note: 
You can customize the key value of the customInfo field for the topic group list of the community (group).
The following sample code names it topic_category.
Getting the list of groups in the community
Call the getCommunityCategoryList(String groupID) method. Sample code:
getCommunityCategoryList(String groupID) async {
    final Map<String, String>? customInfo = await getCommunityCustomInfo(groupID);
    if(customInfo != null){
      final String? categoryListString = customInfo["topic_category"];
      if(categoryListString != null && categoryListString.isNotEmpty){
        return jsonDecode(categoryListString);
      }
    }
  }
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 Future<Map<String, String>?> getCommunityCustomInfo(String groupID) async {
    V2TimValueCallback<List<V2TimGroupInfoResult>> res =
        await TencentImSDKPlugin.v2TIMManager
            .getGroupManager().getGroupsInfo(groupIDList: [groupID]);
    if(res.code != 0){
      final V2TimGroupInfoResult? groupInfo = res.data?[0];
      if(groupInfo != null){
        Map<String, String>? customInfo = groupInfo.groupInfo?.customInfo;
        return customInfo;
      }
    }
    return null;
  }
Configuring the group list for the community
You just need to modify the customInfo in groupInfo. Here is a Map, and the key value is the name of the field for the topic group list you defined.
The getCommunityCustomInfo method is implemented in the above section. Sample code:
setCommunityCategoryList(String groupID, String groupType, List<String> newCategoryList) async {
    final Map<String, String>? customInfo = await getCommunityCustomInfo(groupID);
    customInfo?["topic_category"] = jsonEncode(newCategoryList);
    TencentImSDKPlugin.v2TIMManager
        .getGroupManager()
        .setGroupInfo(info: V2TimGroupInfo(
      customInfo: customInfo,
      groupID: groupID,
      groupType: groupType,
      // ...Other profiles
    ));
  }
Adding a topic to a group
It is recommended that you pass in JSON strings into V2TimTopicInfo customString.
For example, the recommended format for categoryName in the code below is {"category":"Group 1"}.
Sample code:
addCategoryForTopic(String groupID, String categoryName) {
    TencentImSDKPlugin.v2TIMManager.getGroupManager().setTopicInfo(
      topicInfo: V2TimTopicInfo(
        customString: categoryName
      ),
      groupID: groupID, // Group ID of the topic
    );
  }
Getting the topic group
Use the customString after getting the topic list.
Listening for topic callbacks
In V2TIMCommunityListener (Details), topic related callback methods onCreateTopic，onDeleteTopic，onChangeTopicInfo are added for topic event listening. 
Sample code:
V2TIMCommunityListener v2TIMCommunityListener = new V2TIMCommunityListener() {
 onCreateTopic(String groupID, String topicID) {
      // Listen for topic creation notifications
  }
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  onDeleteTopic(String groupID, List<String> topicIDList) {
      // Listen for topic deletion notifications
  }
    onChangeTopicInfo(String groupID, V2TIMTopicInfo topicInfo) {
      // Listen for topic information update notifications
  }
};
TencentImSDKPlugin.v2TIMManager.getCommunityManager().addCommunityListener(listener: v2TIMCommunityListener);
Topic Messages
Topic messages can be used in the same way as ordinary messages and involve the following APIs:
Feature
API
Description
Sends a message
sendMessage (dart)
Set `groupID` to the topic ID.
Receives a message
`onRecvNewMessage` method in `V2TIMAdvancedMsgListener` (dart)
Set `groupID` in the message to the topic ID.
Marks a message as read
cleanConversationUnreadMessageCount  (dart)
Set `groupID` to the topic ID.
Gets historical messages
getGroupHistoryMessageList (dart)
Set `groupID` to the topic ID.
Recalls a message
revokeMessage (dart)
Set `groupID` to the topic ID.
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Category	Feature	API
Community group management	Joining a group	joinGroup (dart)
		Leaving a group	quitGroup (dart)
		Disbanding a group	dismissGroup (dart)
		Getting the group profile	getGroupsInfo (dart)
		Modifying the group profile	setGroupInfo (dart)
Community group member management	Getting the group member list	getGroupMemberList (dart)
		Getting the profile of a group member	getGroupMembersInfo (dart)
		Modifying the profile of a group member	setGroupMemberInfo (dart)
		Removing a group member	kickGroupMember (dart)

Feature	API	Description
Sends a message	sendMessage (dart)	Set `groupID` to the topic ID.
Receives a message	`onRecvNewMessage` method in `V2TIMAdvancedMsgListener` (dart)	Set `groupID` in the message to the topic ID.
Marks a message as read	cleanConversationUnreadMessageCount (dart)	Set `groupID` to the topic ID.
Gets historical messages	getGroupHistoryMessageList (dart)	Set `groupID` to the topic ID.
Recalls a message	revokeMessage (dart)	Set `groupID` to the topic ID.