Interface ChatMessageEventListener

消息事件监听器。

该监听器用于监听消息变更状态：

• 消息成功发送到对方后，发送方会收到送达回执（需开启送达回执功能，详见 (boolean)）。

• 对方阅读了这条消息，发送方会收到已读回执（发送消息时需将 ChatMessage.isNeedReadReceipt 设置为 true）。

发送消息过程中，消息 ID 会从最初本地生成的 uuid 变更为服务器端生成的全局唯一 ID，该 ID 在使用 SDK 的所有设备上均唯一。

添加消息事件监听器：

let msgListener = new (class ss implements ChatMessageEventListener {
  onMessagesReceived(messages: ChatMessage[]): void {
    chatlog.log('ConnectScreen.onMessagesReceived', messages);
  }
  onCmdMessagesReceived(messages: ChatMessage[]): void {
    chatlog.log('ConnectScreen.onCmdMessagesReceived', messages);
  }
  onMessagesRead(messages: ChatMessage[]): void {
    chatlog.log('ConnectScreen.onMessagesRead', messages);
  }
  onGroupMessageRead(groupMessageAcks: ChatGroupMessageAck[]): void {
    chatlog.log('ConnectScreen.onGroupMessageRead', groupMessageAcks);
  }
  onMessagesDelivered(messages: ChatMessage[]): void {
    chatlog.log('ConnectScreen.onMessagesDelivered', messages);
  }
  onMessagesRecalledInfo(messages: ChatRecalledMessageInfo[]): void {
    chatlog.log('ConnectScreen.onMessagesRecalledInfo', messages);
  }
  onConversationsUpdate(): void {
    chatlog.log('ConnectScreen.onConversationsUpdate');
  }
  onConversationRead(from: string, to?: string): void {
    chatlog.log('ConnectScreen.onConversationRead', from, to);
  }
})();
ChatClient.getInstance().chatManager.addListener(msgListener);
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移除消息事件监听器：

ChatClient.getInstance().chatManager.delListener(this.msgListener);
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