douyin_demo/lib/providers/AtUserProvider.dart

import 'package:collection/collection.dart';
import 'package:flutter/material.dart';
import 'package:lpinyin/lpinyin.dart';

class AtUserProvider with ChangeNotifier {
  int curTop = 0;

  double appBtmHeight = 40;
  bool ifStick = true;

  AppBar appBar = AppBar();
  double appHeight = 0;

  List<Key> keys = <Key>[];
  ScrollController controller = ScrollController();

  List<Contact> contacts = <Contact>[];
  List<Map<String, dynamic>> dataMap = <Map<String, dynamic>>[];
  late Map<dynamic, List<dynamic>> result;
  List<String> groupList = [];

  AtUserProvider() {
    appHeight = appBar.preferredSize.height;
    for (var item in data) {
      contacts.add(Contact(
          avatarUrl: item["avatar_url"].toString(),
          userName: item["name"].toString(),
          desc: item["headline"].toString()));
      String startText = item["name"].toString();
      if (startText == "") {
        startText = " ";
      } else {
        startText = startText[0];
      }
      if (RegExp("^[\u4e00-\u9fa5]").firstMatch(startText) != null) {
        contacts.last.groupCode =
            PinyinHelper.getShortPinyin(startText)[0].toLowerCase();
      } else if (RegExp("^[a-zA-Z]").firstMatch(startText) != null) {
        contacts.last.groupCode = startText.toLowerCase();
      } else {
        contacts.last.groupCode = "#";
      }
      groupList.add(contacts.last.groupCode);
      dataMap.add(Contact.toMap(contacts.last));
    }
    groupList = groupList.toSet().toList();
    groupList.sort((a, b) => a.toString().compareTo(b.toString()));
    dataMap.sort((a, b) =>
        a["groupCode"].toString().compareTo(b["groupCode"].toString()));
    result = groupBy(dataMap, (o) => o["groupCode"]);
    // print(result);
    print('done');
  }

  setIfStick(stick) {
    ifStick = stick;
    notifyListeners();
  }
}

class ContactResult {
  String key = "";
  List<dynamic> value = [];
}

class Contact {
  String avatarUrl = "";
  String userName = "";
  String desc = "";
  String groupCode = "";

  static Map<String, dynamic> toMap(Contact item) {
    return {
      "avatarUrl": item.avatarUrl,
      "userName": item.userName,
      "desc": item.desc,
      "groupCode": item.groupCode
    };
  }

  Contact(
      {required this.avatarUrl, required this.desc, required this.userName});
}

List data = [
  {
    "id": "2149cbd6f1fbd070ff9045e648764ab6",
    "url_token": "ji-yi-85-34",
    "name": "记忆",
    "use_default_avatar": false,
    "avatar_url":
        "https://pic1.zhimg.com/v2-0aa271fdadb3130a549af500c4d4569a_is.jpg",
    "avatar_url_template":
        "https://pic1.zhimg.com/v2-0aa271fdadb3130a549af500c4d4569a_{size}.jpg",
    "is_org": false,
    "type": "people",
    "url": "https://www.zhihu.com/people/ji-yi-85-34",
    "user_type": "people",
    "headline": "",
    "gender": -1,
    "is_advertiser": false,
    "vip_info": {"is_vip": false, "rename_days": "60"},
    "badge": [],
    "is_following": false,
    "is_followed": true,
    "follower_count": 0,
    "answer_count": 0,
    "articles_count": 0
  },
  {
    "id": "04d44e85c074c4b22775375886576303",
    "url_token": "leyls-50",
    "name": "Leyls",
    "use_default_avatar": false,
    "avatar_url":
        "https://pic2.zhimg.com/v2-d2f3715564b0b40a8dafbfdec3803f97_is.jpg",
    "avatar_url_template":
        "https://pic2.zhimg.com/v2-d2f3715564b0b40a8dafbfdec3803f97_{size}.jpg",
    "is_org": false,
    "type": "people",
    "url": "https://www.zhihu.com/people/leyls-50",
    "user_type": "people",
    "headline": "",
    "gender": -1,
    "is_advertiser": false,
    "vip_info": {"is_vip": false, "rename_days": "60"},
    "badge": [],
    "is_following": false,
    "is_followed": true,
    "follower_count": 0,
    "answer_count": 0,
    "articles_count": 0
  },
  {
    "id": "8fbf538ae273714fc51df3e845edb22b",
    "url_token": "yong-hu-6198445175",
    "name": "用户6198445175",
    "use_default_avatar": true,
    "avatar_url": "https://pic4.zhimg.com/da8e974dc_is.jpg",
    "avatar_url_template": "https://pic4.zhimg.com/da8e974dc_{size}.jpg",
    "is_org": false,
    "type": "people",
    "url": "https://www.zhihu.com/people/yong-hu-6198445175",
    "user_type": "people",
    "headline": "",
    "gender": -1,
    "is_advertiser": false,
    "vip_info": {"is_vip": false, "rename_days": "60"},
    "badge": [],
    "is_following": false,
    "is_followed": true,
    "follower_count": 0,
    "answer_count": 0,
    "articles_count": 0
  },
  {
    "id": "a91ae701e3a5907caa2e9b391aa2ffed",
    "url_token": "maybe-15-63",
    "name": "Maybe",
    "use_default_avatar": false,
    "avatar_url":
        "https://pic4.zhimg.com/v2-0edac6fcc7bf69f6da105fe63268b84c_is.jpg",
    "avatar_url_template":
        "https://pic4.zhimg.com/v2-0edac6fcc7bf69f6da105fe63268b84c_{size}.jpg",
    "is_org": false,
    "type": "people",
    "url": "https://www.zhihu.com/people/maybe-15-63",
    "user_type": "people",
    "headline": "",
    "gender": -1,
    "is_advertiser": false,
    "vip_info": {"is_vip": false, "rename_days": "60"},
    "badge": [],
    "is_following": false,
    "is_followed": true,
    "follower_count": 0,
    "answer_count": 0,
    "articles_count": 0
  },
  {
    "id": "ea9806c42cc0b02f5f2bd059777724fd",
    "url_token": "du-ji-57-59-74",
    "name": "嘟唧",
    "use_default_avatar": false,
    "avatar_url":
        "https://pic2.zhimg.com/v2-bd46162e4c96d4046ec27a7cf48536cb_is.jpg",
    "avatar_url_template":
        "https://pic2.zhimg.com/v2-bd46162e4c96d4046ec27a7cf48536cb_{size}.jpg",
    "is_org": false,
    "type": "people",
    "url": "https://www.zhihu.com/people/du-ji-57-59-74",
    "user_type": "people",
    "headline": "",
    "gender": -1,
    "is_advertiser": false,
    "vip_info": {"is_vip": false, "rename_days": "60"},
    "badge": [],
    "is_following": false,
    "is_followed": true,
    "follower_count": 0,
    "answer_count": 0,
    "articles_count": 0
  },
  {
    "id": "62f34d1e4fb40d0d5b908aa35bb95459",
    "url_token": "she-yu-79-9",
    "name": "舍予",
    "use_default_avatar": false,
    "avatar_url":
        "https://pic1.zhimg.com/v2-f8c95bf6807a3773eb5679aae2892960_is.jpg",
    "avatar_url_template":
        "https://pic1.zhimg.com/v2-f8c95bf6807a3773eb5679aae2892960_{size}.jpg",
    "is_org": false,
    "type": "people",
    "url": "https://www.zhihu.com/people/she-yu-79-9",
    "user_type": "people",
    "headline": "",
    "gender": -1,
    "is_advertiser": false,
    "vip_info": {"is_vip": false, "rename_days": "60"},
    "badge": [],
    "is_following": false,
    "is_followed": true,
    "follower_count": 0,
    "answer_count": 0,
    "articles_count": 0
  },
  {
    "id": "294db0cf83ea2625c09e098a3bcb0d5f",
    "url_token": "govern-89-70",
    "name": "govern",
    "use_default_avatar": false,
    "avatar_url":
        "https://pic4.zhimg.com/v2-5f8e42cfb17988e013b9bf76153da7be_is.jpg",
    "avatar_url_template":
        "https://pic4.zhimg.com/v2-5f8e42cfb17988e013b9bf76153da7be_{size}.jpg",
    "is_org": false,
    "type": "people",
    "url": "https://www.zhihu.com/people/govern-89-70",
    "user_type": "people",
    "headline": "",
    "gender": -1,
    "is_advertiser": false,
    "vip_info": {"is_vip": false, "rename_days": "60"},
    "badge": [],
    "is_following": false,
    "is_followed": true,
    "follower_count": 0,
    "answer_count": 0,
    "articles_count": 0
  },
  {
    "id": "7d54c9819b6cec2a47518e37be7e0dfa",
    "url_token": "melody-48-78",
    "name": "melody",
    "use_default_avatar": false,
    "avatar_url":
        "https://pic4.zhimg.com/v2-8824912d536a4c3185ed0a33453b87c0_is.jpg",
    "avatar_url_template":
        "https://pic4.zhimg.com/v2-8824912d536a4c3185ed0a33453b87c0_{size}.jpg",
    "is_org": false,
    "type": "people",
    "url": "https://www.zhihu.com/people/melody-48-78",
    "user_type": "people",
    "headline": "",
    "gender": -1,
    "is_advertiser": false,
    "vip_info": {"is_vip": false, "rename_days": "60"},
    "badge": [],
    "is_following": false,
    "is_followed": true,
    "follower_count": 0,
    "answer_count": 0,
    "articles_count": 0
  },
  {
    "id": "017090d3fbbcba60b16f2e28ff6a78c2",
    "url_token": "na-4jia-ha-will",
    "name": "那4家哈will",
    "use_default_avatar": true,
    "avatar_url": "https://pic4.zhimg.com/da8e974dc_is.jpg",
    "avatar_url_template": "https://pic4.zhimg.com/da8e974dc_{size}.jpg",
    "is_org": false,
    "type": "people",
    "url": "https://www.zhihu.com/people/na-4jia-ha-will",
    "user_type": "people",
    "headline": "",
    "gender": -1,
    "is_advertiser": false,
    "vip_info": {"is_vip": false, "rename_days": "60"},
    "badge": [],
    "is_following": false,
    "is_followed": true,
    "follower_count": 0,
    "answer_count": 0,
    "articles_count": 0
  },
  {
    "id": "8e88f077f33d1c9a368a2829293214c8",
    "url_token": "susu-35-99",
    "name": "susu",
    "use_default_avatar": false,
    "avatar_url":
        "https://pic1.zhimg.com/v2-0246f15a0edea34ad0fa426cef107cca_is.jpg",
    "avatar_url_template":
        "https://pic1.zhimg.com/v2-0246f15a0edea34ad0fa426cef107cca_{size}.jpg",
    "is_org": false,
    "type": "people",
    "url": "https://www.zhihu.com/people/susu-35-99",
    "user_type": "people",
    "headline": "",
    "gender": -1,
    "is_advertiser": false,
    "vip_info": {"is_vip": false, "rename_days": "60"},
    "badge": [],
    "is_following": false,
    "is_followed": true,
    "follower_count": 0,
    "answer_count": 0,
    "articles_count": 0
  },
  {
    "id": "bcb3809c512bc3f5ce266790a2d69eb9",
    "url_token": "an-an-zai-zhe-li",
    "name": "安安在这里",
    "use_default_avatar": false,
    "avatar_url":
        "https://pic3.zhimg.com/v2-e76b43292c40d3888d55644c75cb1a9d_is.jpg",
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    "is_org": false,
    "type": "people",
    "url": "https://www.zhihu.com/people/an-an-zai-zhe-li",
    "user_type": "people",
    "headline": "",
    "gender": -1,
    "is_advertiser": false,
    "vip_info": {"is_vip": false, "rename_days": "60"},
    "badge": [],
    "is_following": false,
    "is_followed": true,
    "follower_count": 0,
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    "articles_count": 0
  },
  {
    "id": "2780e8e9169704de47fdaca88747cfbe",
    "url_token": "xuan-yun-51-6",
    "name": "轩云",
    "use_default_avatar": false,
    "avatar_url":
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    "headline": "",
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    "vip_info": {"is_vip": false, "rename_days": "60"},
    "badge": [],
    "is_following": false,
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  },
  {
    "id": "13b23e127a897838fa372bcb33a83fa1",
    "url_token": "wei-feng-qing-yu-99",
    "name": "微风清雨",
    "use_default_avatar": false,
    "avatar_url":
        "https://pic4.zhimg.com/v2-f60459b992aa3df8ecf313db0451c48c_is.jpg",
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    "is_org": false,
    "type": "people",
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    "user_type": "people",
    "headline": "",
    "gender": -1,
    "is_advertiser": false,
    "vip_info": {"is_vip": false, "rename_days": "60"},
    "badge": [],
    "is_following": false,
    "is_followed": true,
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    "answer_count": 0,
    "articles_count": 0
  },
  {
    "id": "0f8bc9f18b249c7d214582dc40a81800",
    "url_token": "present-2-45",
    "name": "PRESENT",
    "use_default_avatar": false,
    "avatar_url":
        "https://pic2.zhimg.com/v2-ab4e823f1d9610dc2eff629948cdfea6_is.jpg",
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    "is_org": false,
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    "user_type": "people",
    "headline": "",
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    "vip_info": {"is_vip": false, "rename_days": "60"},
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    "articles_count": 0
  },
  {
    "id": "dff166d133b4a3ce4967871873b95403",
    "url_token": "yu-xi-4-89",
    "name": "玉璽",
    "use_default_avatar": true,
    "avatar_url": "https://pic4.zhimg.com/da8e974dc_is.jpg",
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  },
  {
    "id": "6775f0f8abefef670cd748fd4bdc98fb",
    "url_token": "a-bai-7-98",
    "name": "阿白",
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    "avatar_url":
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  },
  {
    "id": "a3e583a3cf456e911e7744b4bc5ffe1e",
    "url_token": "wan-ju-gong-han",
    "name": "玩具工厂",
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    "avatar_url":
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  },
  {
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    "url_token": "a-jun-82-48-57",
    "name": "阿军",
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    "avatar_url":
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  },
  {
    "id": "b8bfdb6901403ff5d7ab490c6ccddff0",
    "url_token": "a-qiang-15-57-64",
    "name": "阿强",
    "use_default_avatar": false,
    "avatar_url":
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  {
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    "url_token": "qing-yu-42-55-23",
    "name": "轻语",
    "use_default_avatar": false,
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  },
  {
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    "url_token": "bai-ying-64-30",
    "name": "白影",
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  {
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