Dictionary 数据未在Text（）小部件中呈现，我如何在我的Flatter应用程序中查看数据_Dictionary_Listview_Flutter

Dictionary 数据未在Text（）小部件中呈现，我如何在我的Flatter应用程序中查看数据

dictionary listview flutter

Dictionary 数据未在Text（）小部件中呈现，我如何在我的Flatter应用程序中查看数据,dictionary,listview,flutter,Dictionary,Listview,Flutter,我想在我的屏幕上查看粗体数据，请帮助我我试过这种方法，但它不起作用 processed: { id: c459d2da5100afb1b4ab0352debfa4736aadd8c2e36529fe0861c9c8cadddeae, block_num: 51299894, block_time: 2019-09-24T11:40:11.500, producer_block_id: null, recei

我想在我的屏幕上查看粗体数据，请帮助我我试过这种方法，但它不起作用

processed: {
        id: c459d2da5100afb1b4ab0352debfa4736aadd8c2e36529fe0861c9c8cadddeae, 
        block_num: 51299894, 
        block_time: 2019-09-24T11:40:11.500, 
        producer_block_id: null, 
        receipt: {
            status: executed, 
            cpu_usage_us: 226, 
            net_usage_words: 13
        }, 
        elapsed: 226, 
        net_usage: 104, 
        scheduled: false, 
        action_traces: [
                        {
                            action_ordinal: 1, 
                            creator_action_ordinal: 0, 
                            closest_unnotified_ancestor_action_ordinal: 0, 
                            receipt: {
                                        receiver: guru11111111, 
                                        act_digest: 55e9b8f98bde721c3f3e53cf98a20814a5d426290b0bf55f842d97866bc71f6c, 
                                        global_sequence: 488304782, 
                                        recv_sequence: 329, 
                                        auth_sequence: [
                                            [guru11111111, 399]
                                        ], 
                                        code_sequence: 25, 
                                        abi_sequence: 14
                                        }, 
                            receiver: guru11111111, 
                            act: {
                                    account: guru11111111, 
                                    name: getborrower, 
                                    authorization: [
                                                        {
                                                            actor: guru11111111, 
                                                            permission: active
                                                        }
                                                    ], 
                                    data: 
                                        {
                                            acc_name: guru
                                        }, 
                                    hex_data: 0000000000a0af66
                                }, 
                            context_free: false, 
                            elapsed: 60, 
                            console: 
                            Borrower Name: guru
                            ID: 1
                            Location: varanasi
                            Phone Number: 8563070443, 
                            Loan Amount:465200 
                        }


进口“包装：颤振/材料.省道”；
导入“package:shared_preferences/shared_preferences.dart”；
导入“包：eosdart/eosdart.dart”作为eos；
SharedReferences SharedReferences；
getCredential（）异步{
SharedReferences=等待SharedReferences.getInstance（）；
}
void main（）=>runApp（get借款人（））；
类GetFrooder扩展StatefulWidget{
@凌驾
_GetFrooderState createState（）=>\u GetFrooderState（）；
}
类_getFrowerState扩展状态{
eos.账户_账户；
eos.EOSClient _EOSClient=eos.EOSClient(
'http://jungle2.cryptolions.io:80","v1",，
私钥：[“5JFVW2PTRKACLBLETEVXCWAQUT8NNWVP2BYCRPRKPBWDGZDEO1]”）；
Map fetch=newmap（）；
//列表获取；
作废(){
列表验证=[
eos.Authorization（）
…演员='guru11111'
…权限='活动'
];
//
地图数据={
“acc_name”：“guru”，
};
列出操作=[
eos.行动（）
..账户='guru11111'
..名称='Get借款人'
…授权=auth
…数据=数据
];
设置状态（）{
eos.Transaction事务=eos.Transaction（）…操作=操作；
_eosClient.pushTransaction（事务，广播：true）。然后（（trx）{
打印（trx）；
fetch=trx；
});
打印（“hiiiii”）；
});
//fetch=json.decode（trx）.toString（）作为映射；
//打印（'Loaded${fetch.length}'）；
}
fetchdata（）{
扩大回报(
弹性：4，
子项：新建ListView.builder(
itemCount:fetch.length，
itemBuilder:（构建上下文，int索引）{
String key=fetch.keys.elementAt（索引）；
返回列(
儿童：[
//文本（“$key”），
文本（“${fetch[key]}”），
],
);
}),
);
}
@凌驾
小部件构建（构建上下文）{
返回材料PP(
家：脚手架(
背景颜色：Colors.teal，
正文：安全区(
子：列(
儿童：[
文本（“hi”），
扁平按钮(
颜色：颜色，白色，
child:Text（'get-border'），
已按下：（）{
_获取借款人（）；
},
),
灵活的(
子项：新建ListView.builder(
itemCount:fetch.length，
itemBuilder:（构建上下文，int索引）{
String key=fetch.keys.elementAt（索引）；
返回列(
儿童：[
//文本（“$key”），
文本（“${fetch[key]}”），
],
);
}),
),
],
),
),
),
);
}

我还能做什么或者我做错了什么请帮助实际上，我的数据是通过获取的，但当我按下ctrl+s时，它没有得到渲染，我的小部件得到刷新，然后在屏幕上显示数据

如何改进此功能？

我会将设置状态移动到

中，然后移动到您的未来


import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:eosdart/eosdart.dart' as eos;

SharedPreferences sharedPreferences;
getCredential() async {
  sharedPreferences = await SharedPreferences.getInstance();
}

void main() => runApp(GetBorrower());

class GetBorrower extends StatefulWidget {
  @override
  _GetBorrowerState createState() => _GetBorrowerState();
}

class _GetBorrowerState extends State<GetBorrower> {
  eos.Account _account;
  eos.EOSClient _eosClient = eos.EOSClient(
      'http://jungle2.cryptolions.io:80', 'v1',
      privateKeys: ["5JfVW2PtRkAcLbLETevxCwaQuT8NNWvP2eBYCrPRKPBWDgZDEo1"]);


  Map fetch = new Map();
//  List fetch;
  void _fetchborrower() {
    List<eos.Authorization> auth = [
      eos.Authorization()
        ..actor = 'guru11111111'
        ..permission = 'active'
    ];
//
    Map data = {
      'acc_name': 'guru',
    };

    List<eos.Action> actions = [
      eos.Action()
        ..account = 'guru11111111'
        ..name = 'getborrower'
        ..authorization = auth
        ..data = data
    ];
    setState(() {
      eos.Transaction transaction = eos.Transaction()..actions = actions;
      _eosClient.pushTransaction(transaction, broadcast: true).then((trx) {
        print(trx);
        fetch = trx;
      });

      print('hiiiii');
    });

//      fetch = json.decode(trx).toString() as Map;
//      print('Loaded ${fetch.length}');
  }

  fetchdata() {
    return Expanded(
      flex: 4,
      child: new ListView.builder(
          itemCount: fetch.length,
          itemBuilder: (BuildContext context, int index) {
            String key = fetch.keys.elementAt(index);
            return Column(
              children: <Widget>[
//                          Text('$key'),
                Text('${fetch[key]}'),
              ],
            );
          }),
    );
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        backgroundColor: Colors.teal,
        body: SafeArea(
          child: Column(
            children: <Widget>[
              Text('hi'),
              FlatButton(
                color: Colors.white,
                child: Text('get borrower'),
                onPressed: () {
                  _fetchborrower();
                },
              ),
              Flexible(
                child: new ListView.builder(
                    itemCount: fetch.length,
                    itemBuilder: (BuildContext context, int index) {
                      String key = fetch.keys.elementAt(index);
                      return Column(
                        children: <Widget>[
//                          Text('$key'),
                          Text('${fetch[key]}'),
                        ],
                      );
                    }),
              ),
            ],
          ),
        ),
      ),
    );
  }






如果您有任何建议，我们将不胜感激。请帮助我了解它的工作原理。但是您能告诉我为什么它在我的案例中不起作用，因为它已经在setState（）中了在此之前，另一件事是我只想打印我的控制台中显示的粗体数据。你能帮我解决这个问题吗？我只需将控制台数据更改为串行数据，这样很容易查看。你不应该将未来放在设置状态中。如果这解决了你的问题，请标记为接受答案
processed: {
        id: c459d2da5100afb1b4ab0352debfa4736aadd8c2e36529fe0861c9c8cadddeae, 
        block_num: 51299894, 
        block_time: 2019-09-24T11:40:11.500, 
        producer_block_id: null, 
        receipt: {
            status: executed, 
            cpu_usage_us: 226, 
            net_usage_words: 13
        }, 
        elapsed: 226, 
        net_usage: 104, 
        scheduled: false, 
        action_traces: [
                        {
                            action_ordinal: 1, 
                            creator_action_ordinal: 0, 
                            closest_unnotified_ancestor_action_ordinal: 0, 
                            receipt: {
                                        receiver: guru11111111, 
                                        act_digest: 55e9b8f98bde721c3f3e53cf98a20814a5d426290b0bf55f842d97866bc71f6c, 
                                        global_sequence: 488304782, 
                                        recv_sequence: 329, 
                                        auth_sequence: [
                                            [guru11111111, 399]
                                        ], 
                                        code_sequence: 25, 
                                        abi_sequence: 14
                                        }, 
                            receiver: guru11111111, 
                            act: {
                                    account: guru11111111, 
                                    name: getborrower, 
                                    authorization: [
                                                        {
                                                            actor: guru11111111, 
                                                            permission: active
                                                        }
                                                    ], 
                                    data: 
                                        {
                                            acc_name: guru
                                        }, 
                                    hex_data: 0000000000a0af66
                                }, 
                            context_free: false, 
                            elapsed: 60, 
                            console: 
                            Borrower Name: guru
                            ID: 1
                            Location: varanasi
                            Phone Number: 8563070443, 
                            Loan Amount:465200 
                        }




import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:eosdart/eosdart.dart' as eos;

SharedPreferences sharedPreferences;
getCredential() async {
  sharedPreferences = await SharedPreferences.getInstance();
}

void main() => runApp(GetBorrower());

class GetBorrower extends StatefulWidget {
  @override
  _GetBorrowerState createState() => _GetBorrowerState();
}

class _GetBorrowerState extends State<GetBorrower> {
  eos.Account _account;
  eos.EOSClient _eosClient = eos.EOSClient(
      'http://jungle2.cryptolions.io:80', 'v1',
      privateKeys: ["5JfVW2PtRkAcLbLETevxCwaQuT8NNWvP2eBYCrPRKPBWDgZDEo1"]);


  Map fetch = new Map();
//  List fetch;
  void _fetchborrower() {
    List<eos.Authorization> auth = [
      eos.Authorization()
        ..actor = 'guru11111111'
        ..permission = 'active'
    ];
//
    Map data = {
      'acc_name': 'guru',
    };

    List<eos.Action> actions = [
      eos.Action()
        ..account = 'guru11111111'
        ..name = 'getborrower'
        ..authorization = auth
        ..data = data
    ];
    setState(() {
      eos.Transaction transaction = eos.Transaction()..actions = actions;
      _eosClient.pushTransaction(transaction, broadcast: true).then((trx) {
        print(trx);
        fetch = trx;
      });

      print('hiiiii');
    });

//      fetch = json.decode(trx).toString() as Map;
//      print('Loaded ${fetch.length}');
  }

  fetchdata() {
    return Expanded(
      flex: 4,
      child: new ListView.builder(
          itemCount: fetch.length,
          itemBuilder: (BuildContext context, int index) {
            String key = fetch.keys.elementAt(index);
            return Column(
              children: <Widget>[
//                          Text('$key'),
                Text('${fetch[key]}'),
              ],
            );
          }),
    );
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        backgroundColor: Colors.teal,
        body: SafeArea(
          child: Column(
            children: <Widget>[
              Text('hi'),
              FlatButton(
                color: Colors.white,
                child: Text('get borrower'),
                onPressed: () {
                  _fetchborrower();
                },
              ),
              Flexible(
                child: new ListView.builder(
                    itemCount: fetch.length,
                    itemBuilder: (BuildContext context, int index) {
                      String key = fetch.keys.elementAt(index);
                      return Column(
                        children: <Widget>[
//                          Text('$key'),
                          Text('${fetch[key]}'),
                        ],
                      );
                    }),
              ),
            ],
          ),
        ),
      ),
    );
  }






  eos.Transaction transaction = eos.Transaction()..actions = actions;
  _eosClient.pushTransaction(transaction, broadcast: true).then((trx) {
      print(trx);
      setState(() {
        fetch = trx;
      });

      print('hiiiii');
  });