convert JSON String to the list object in flutter

问题

I'm still new to the dart flutter. now I'm trying to pull data from the REST API. following the script that I have made:

class ChatCard {
  final String chatdetail_id;
  final String chatdetail_userfullname;
  final String chatdetail_userurlphoto;
  final String chatdetail_message;
  final int chatdetail_isread;
  final String chatdetail_datetime;

  ChatCard({
    this.chatdetail_id,
    this.chatdetail_userfullname,
    this.chatdetail_userurlphoto,
    this.chatdetail_message,
    this.chatdetail_isread,
    this.chatdetail_datetime
  });

  factory ChatCard.fromJson(Map<String, dynamic> json) {
    return new ChatCard(
      chatdetail_id : json['chatdetail_id'] as String,
      chatdetail_userfullname : json['chatdetail_userfullname'] as String,
      chatdetail_userurlphoto : json['chatdetail_userurlphoto'] as String,
      chatdetail_message : json['chatdetail_message'] as String,
      chatdetail_isread : json['chatdetail_isread'] as int,
      chatdetail_datetime : json['chatdetail_datetime'] as String
    );
  }
}

class ChatCardList extends StatefulWidget {

  List<ChatCard> chatcard;

  ChatCardList({Key key, this.chatcard}) : super(key: key);

  @override
  _ChatCardListState createState() => new _ChatCardListState(chatcard:chatcard);

  ChatCardList.tambah(String message) {
    print("RESULT MESSAGE = " + message); //result on console : [{"createdAt":"2018-08-16T02:38:37.757Z","is_read":1,"_id":"5b74e3ad26c7de02ed664dd2","from_id":"5b74d3f5e0da63027ab03664","from_name":"Ahmad Adiwijaya","from_photo":"","from_device":"Mobile Phone","text":"Kami dari sekolah tinggi yg hanya satu prodi. Apakah lembaga penjaminan mutuh harus 2, yaitu LPM pada level institusi dan UPM pada level prodi?"},{"from_id":"SystemDate","from_name":"System","from_photo":"","text":"2018-08-23T11:26:53.968Z"}]

  }
}

My question is, how do I input the 'RESULT MESSAGE' result data above to class List<ChatCard> chatcard?

many thank,

回答1:

Are you expecting some like this,

ChatCardList.tambah(String message) {
  List<ChatCard> chatCardList = message
    .map((chatCardJson) => ChatCard.fromJson(chatCardJson))
    .toList();
  print(chatCardList); // [Instance of 'ChatCard', Instance of 'ChatCard']
}

Note: But the keys in the json printed in the console and in the keys in the ChatCard are different. You might have to revisit that.

来源：https://stackoverflow.com/questions/52225846/convert-json-string-to-the-list-object-in-flutter

标签

android

dart

Flutter