XHGroupManager groupManager = XHClient.getInstance().getGroupManager();
groupManager.addListener(new IXHGroupManagerListener() {
	@Override
	public void onMembersUpdeted(String groupID, int number) {
		//member number change
	}

	@Override
	public void onSelfKicked(String groupID) {
		//You are removed from the current group 
	}

	@Override
	public void onGroupDeleted(String groupID) {
		//Group deleted notification  
	}

	@Override
	public void onReceivedMessage(XHIMMessage message) {
		//Receive group message
	}
	
});

/**
 * Add listener
 * @param groupManagerListener IXHGroupManagerListener Group event listener
 */
void addListener(IXHGroupManagerListener groupManagerListener);

/**
 * Create a group
 * @param groupName Group name
 * @param callback result callback
 */
void createGroup(String groupName,IXHResultCallback callback);

/**
 * Delete the group
 * @param groupID group ID
 * @param callback result callback
 */
void deleteGroup(String groupID,IXHResultCallback callback);

/**
 Add group members
 @param memberIds the array of Member ID 
 @param groupID group ID
 @param callback result callback
 */
void addGroupMembers(String groupID, ArrayList<String> memberIDs, IXHResultCallback callback);

/**
 Delete group member
 @param memberIds the array of Member ID
 @param groupID group ID
 @param callback result callback
 */
void deleteGroupMembers(String groupID,ArrayList<String> memberIDs, IXHResultCallback callback);

/**
 * Set push switch
 * @param groupID group ID
 * @param enable Whether to push group messages
 * @param callback result callback
 */
void setPushEnable(String groupID,Boolean enable,IXHResultCallback callback);

/**
 *Send a message，and Offline users can receive historical messages after going online。
 * @param groupID group ID
 * @param atUserIDs @user
 * @param Message message cotent
 * @param callback result callback
 * @return  message object
 */
XHIMMessage sendMessage(String groupID, ArrayList<String> atUserIDs, String Message, IXHResultCallback callback);

/**
 *Send group online message, which only the current online user can receive, and offline users who go online again can't receive the history message.
 * @param groupID group ID
 * @param atUserIDs @user
 * @param Message message cotent
 * @param callback result callback
 * @return message object
 */
XHIMMessage sendOnlineMessage(String groupID, ArrayList<String> atUserIDs, String Message, IXHResultCallback callback);