fix bug

lib/src/models/conversation_info.dart

@@ -0,0 +1,77 @@
+import 'dart:convert';
+
+import 'package:flutter_openim_sdk/flutter_openim_sdk.dart';
+
+class ConversationInfo {
+  String conversationID;
+  int? conversationType;
+  String? userID;
+  String? groupID;
+  String? showName;
+  String? faceUrl;
+  int? recvMsgOpt;
+  int? unreadCount;
+  Message? latestMsg;
+  int? latestMsgSendTime;
+  String? draftText;
+  int? draftTimestamp;
+  dynamic isPinned;
+
+  ConversationInfo(
+      {required this.conversationID,
+      this.conversationType,
+      this.userID,
+      this.groupID,
+      this.showName,
+      this.faceUrl,
+      this.recvMsgOpt,
+      this.unreadCount,
+      this.latestMsg,
+      this.latestMsgSendTime,
+      this.draftText,
+      this.draftTimestamp,
+      this.isPinned});
+
+  ConversationInfo.fromJson(Map<String, dynamic> json)
+      : conversationID = json['conversationID'] {
+    // conversationID = json['conversationID'];
+    conversationType = json['conversationType'];
+    userID = json['userID'];
+    groupID = json['groupID'];
+    showName = json['showName'];
+    faceUrl = json['faceUrl'];
+    recvMsgOpt = json['recvMsgOpt'];
+    unreadCount = json['unreadCount'];
+    // latestMsg = json['latestMsg'];
+    // if (null != json['latestMsg']) {
+    if (json['latestMsg'] is String) {
+      latestMsg = Message.fromJson(jsonDecode(json['latestMsg']));
+    } else if (json['latestMsg'] is Map) {
+      latestMsg = Message.fromJson(json['latestMsg']);
+    }
+    // }
+
+    latestMsgSendTime = json['latestMsgSendTime'];
+    draftText = json['draftText'];
+    draftTimestamp = json['draftTimestamp'];
+    isPinned = json['isPinned'];
+  }
+
+  Map<String, dynamic> toJson() {
+    final Map<String, dynamic> data = new Map<String, dynamic>();
+    data['conversationID'] = this.conversationID;
+    data['conversationType'] = this.conversationType;
+    data['userID'] = this.userID;
+    data['groupID'] = this.groupID;
+    data['showName'] = this.showName;
+    data['faceUrl'] = this.faceUrl;
+    data['recvMsgOpt'] = this.recvMsgOpt;
+    data['unreadCount'] = this.unreadCount;
+    data['latestMsg'] = this.latestMsg?.toJson();
+    data['latestMsgSendTime'] = this.latestMsgSendTime;
+    data['draftText'] = this.draftText;
+    data['draftTimestamp'] = this.draftTimestamp;
+    data['isPinned'] = this.isPinned;
+    return data;
+  }
+}