dictionary - 数据未在 Text() 小部件中呈现，我如何在 Flutter 应用程序中查看数据

Question

    Map data = {
      'acc_name': 'guru',
    };

    List<eos.Action> actions = [
      eos.Action()
        ..account = 'guru11111111'
        ..name = 'getborrower'
        ..authorization = auth
        ..data = data
    ];

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

我的数据是trx可变的，它在我的颤振控制台中以这种方式出现

I/flutter ( 8554): {transaction_id: ed53dd56e76a313ad95fda218bb5061e995844e46f7d8ad613e944bc26cb297d, processed: {id: ed53dd56e76a313ad95fda218bb5061e995844e46f7d8ad613e944bc26cb297d, block_num: 51263066, block_time: 2019-09-24T06:29:57.000, producer_block_id: null, receipt: {status: executed, cpu_usage_us: 173, net_usage_words: 13}, elapsed: 173, 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: 488200462, recv_sequence: 216, auth_sequence: [[guru11111111, 286]], code_sequence: 25, abi_sequence: 14}, 接收者: guru11111111, act: {account: guru11111111, name: getborrower, 授权: [{actor:guru11111111，权限：活动}]，数据：{acc_name：guru}，hex_data：0000000000a0af66}，context_free：false，经过：51，控制台：借款人姓名：guru ID：1 地点：varanasi 电话号码：8563070443

**我尝试对上述数据进行一些序列化**

**我要打印的内容简而言之，在此之后您将查看完整数据**

processed{

                                action_traces
                                            [
                                                {
                                                    console: 
                                                    Borrower Name: guru
                                                    ID: 1
                                                    Location: varanasi
                                                    Phone Number: 8563070443, 
                                                    Loan Amount:465200 
                                                }
                                            ]
                             }

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 
                        }

我想在我的屏幕上查看粗体数据请帮助我我已经尝试过这种方式但它不起作用

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]}'),
                        ],
                      );
                    }),
              ),
            ],
          ),
        ),
      ),
    );
  }

我还能做什么或我做错了什么请帮助实际上我的数据正在获取但当时当我按下ctrl+s并且我的小部件刷新它在屏幕上显示数据时它没有得到渲染然后我该如何改进呢？

标签： dictionarylistviewflutter

Answer 1

我会将 setState 移动到then你的未来。

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

      print('hiiiii');
  });