方法'[]'在null上被调用。接收方：空尝试调用：[]（“状态”）

Question

════════ Exception caught by widgets library ═══════════════════════════════════════════════════════
The method '[]' was called on null.
Receiver: null
Tried calling: []("status")
The relevant error-causing widget was: 
  StreamBuilder<DocumentSnapshot> file:///H:/Logos/Flutter-project-multi-store-master/lib/tiles/stores_tile.dart:97:12
════════════════════════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by widgets library ═══════════════════════════════════════════════════════
The method '[]' was called on null.
Receiver: null
Tried calling: []("status")
The relevant error-causing widget was: 
  StreamBuilder<DocumentSnapshot> file:///H:/Logos/Flutter-project-multi-store-master/lib/tiles/stores_tile.dart:8:12
════════════════════════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by widgets library ═══════════════════════════════════════════════════════
The method '[]' was called on null.
Receiver: null
Tried calling: []("status")
The relevant error-causing widget was: 
  StreamBuilder<DocumentSnapshot> file:///H:/Logos/Flutter-project-multi-store-master/lib/tiles/stores_tile.dart:52:12

这是路径文件夹代码

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:delivery_morenope/tabs/stores_tab.dart';
import 'package:flutter/material.dart';

class ApalhocaTile extends StatelessWidget {
  @override
  Widget build(BuildContext context) { 
    return StreamBuilder<DocumentSnapshot>(
        stream: Firestore.instance
            .collection('statusStore')
            .document('statusLoja01')
            .snapshots(),
        builder: (context, snapshot) {
          if (!snapshot.hasData) {
            return Center(
              child: CircularProgressIndicator(),
            );
          } else {
            return Column(
              children: <Widget>[
                Padding(
                  padding: EdgeInsets.only(left: 10, top: 4, right: 10),
                  child: InkWell(
                      onTap: snapshot.data['status'] == false
                          ? null
                          : () {
                              Navigator.of(context).push(MaterialPageRoute(
                                  builder: (context) => StorePalhocaTab()));
                            },
                      child: _buildItens(context, 'images/lojaA.jpg',
                          'Restaurante e Pizzaria', 'O Palhoção')),
                ),
                Text(
                  snapshot.data['status'] == true
                      ? 'Estabelecimento ABERTO'
                      : 'Estabelecimento FECHADO',
                  style: TextStyle(
                      color: snapshot.data['status'] == true
                          ? Colors.greenAccent[700]
                          : Colors.red),
                )
              ],
            );
          }
        });
  }
}

class DeliciaTile extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return StreamBuilder<DocumentSnapshot>(
        stream: Firestore.instance
            .collection('statusStore')
            .document('statusLoja02')
            .snapshots(),
        builder: (context, snapshot) {
          if (!snapshot.hasData) {
            return Center(
              child: CircularProgressIndicator(),
            );
          } else {
            return Column(
              children: <Widget>[
                Padding(
                  padding: EdgeInsets.only(left: 10, top: 4, right: 10),
                  child: InkWell(
                    onTap: snapshot.data['status'] == false
                        ? null
                        : () {
                            Navigator.of(context).push(MaterialPageRoute(
                                builder: (context) => StoreDeliciaTab()));
                          },
                    child: _buildItens(context, 'images/lojaB.jpg',
                        'Restaurante e Pizzaria', 'Pizzaria Deliciosa'),
                  ),
                ),
                Text(
                  snapshot.data['status'] == true
                      ? 'Estabelecimento ABERTO'
                      : 'Estabelecimento FECHADO',
                  style: TextStyle(
                      color: snapshot.data['status'] == true
                          ? Colors.greenAccent[700]
                          : Colors.red),
                )
              ],
            );
          }
        });
  }
}

class OboticarioTile extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return StreamBuilder<DocumentSnapshot>(
        stream: Firestore.instance
            .collection('statusStore')
            .document('statusLoja03')
            .snapshots(),
        builder: (context, snapshot) {
          if (!snapshot.hasData) {
            return Center(child: CircularProgressIndicator());
          } else {
            return Column(
              children: <Widget>[
                Padding(
                  padding: EdgeInsets.only(left: 10, top: 4, right: 10),
                  child: InkWell(
                      onTap: snapshot.data['status'] == false
                          ? null
                          : () {
                              Navigator.of(context).push(MaterialPageRoute(
                                  builder: (context) => StoreBoticarioTab()));
                            },
                      child: _buildItens(context, 'images/lojaC.jpg',
                          'Perfumaria', 'O Boticário')),
                ),
                Text(
                  snapshot.data['status'] == true
                      ? 'Estabelecimento ABERTO'
                      : 'Estabelecimento FECHADO',
                  style: TextStyle(
                      color: snapshot.data['status'] == true
                          ? Colors.greenAccent[700]
                          : Colors.red),
                )
              ],
            );
          }
        });
  }
}

class MinhaCoxinhaFavoritaTile extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return StreamBuilder<DocumentSnapshot>(
        stream: Firestore.instance
            .collection('statusStore')
            .document('statusLoja04')
            .snapshots(),
        builder: (context, snapshot) {
          if (!snapshot.hasData) {
            return Center(child: CircularProgressIndicator());
          } else {
            return Column(
              children: <Widget>[
                Padding(
                  padding: EdgeInsets.only(left: 10, top: 4, right: 10),
                  child: InkWell(
                      onTap: snapshot.data['status'] == false
                          ? null
                          : () {
                              Navigator.of(context).push(MaterialPageRoute(
                                  builder: (context) =>
                                      StoreMinhaCoxinhaFavoritaTab()));
                            },
                      child: _buildItens(context, 'images/lojaD.jpg',
                          'Lanchonete', 'Minha\nEmpada Favorita')),
                ),
                Text(
                  snapshot.data['status'] == true
                      ? 'Estabelecimento ABERTO'
                      : 'Estabelecimento FECHADO',
                  style: TextStyle(
                      color: snapshot.data['status'] == true
                          ? Colors.greenAccent[700]
                          : Colors.red),
                )
              ],
            );
          }
        });
  }
}

class MagoEspetionhoTile extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return StreamBuilder<DocumentSnapshot>(
        stream: Firestore.instance
            .collection('statusStore')
            .document('statusLoja05')
            .snapshots(),
        builder: (context, snapshot) {
          if (!snapshot.hasData) {
            return Center(child: CircularProgressIndicator());
          } else {
            return Column(
              children: <Widget>[
                Padding(
                  padding: EdgeInsets.only(left: 10, top: 4, right: 10),
                  child: InkWell(
                      onTap: snapshot.data['status'] == false
                          ? null
                          : () {
                              Navigator.of(context).push(MaterialPageRoute(
                                  builder: (context) =>
                                      StoreMagoEspetinhoTab()));
                            },
                      child: _buildItens(context, 'images/lojaE.jpg',
                          'Espetinho', 'Magão do Espetinho')),
                ),
                Text(
                  snapshot.data['status'] == true
                      ? 'Estabelecimento ABERTO'
                      : 'Estabelecimento FECHADO',
                  style: TextStyle(
                      color: snapshot.data['status'] == true
                          ? Colors.greenAccent[700]
                          : Colors.red),
                )
              ],
            );
          }
        });
  }
}

class DaLenaTile extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return StreamBuilder<DocumentSnapshot>(
        stream: Firestore.instance
            .collection('statusStore')
            .document('statusLoja06')
            .snapshots(),
        builder: (context, snapshot) {
          if (!snapshot.hasData) {
            return Center(
              child: CircularProgressIndicator(),
            );
          } else {
            return Column(
              children: <Widget>[
                Padding(
                  padding: EdgeInsets.only(left: 10, top: 4, right: 10),
                  child: InkWell(
                      onTap: snapshot.data['status'] == false
                          ? null
                          : () {
                              Navigator.of(context).push(MaterialPageRoute(
                                  builder: (context) => StoreDalenaTab()));
                            },
                      child: _buildItens(context, 'images/lojaF.jpg',
                          'Hamburgueria', 'Helena\nHamburgueria')),
                ),
                Text(
                  snapshot.data['status'] == true
                      ? 'Estabelecimento ABERTO'
                      : 'Estabelecimento FECHADO',
                  style: TextStyle(
                      color: snapshot.data['status'] == true
                          ? Colors.greenAccent[700]
                          : Colors.red),
                )
              ],
            );
          }
        });
  }
}

class DindinTile extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return StreamBuilder<DocumentSnapshot>(
        stream: Firestore.instance
            .collection('statusStore')
            .document('statusLoja07')
            .snapshots(),
        builder: (context, snapshot) {
          if (!snapshot.hasData) {
            return Center(
              child: CircularProgressIndicator(),
            );
          } else {
            return Column(
              children: <Widget>[
                Padding(
                  padding: EdgeInsets.only(left: 10, top: 4, right: 10),
                  child: InkWell(
                      onTap: snapshot.data['status'] == false
                          ? null
                          : () {
                              Navigator.of(context).push(MaterialPageRoute(
                                  builder: (context) => StoreDindinTab()));
                            },
                      child: _buildItens(context, 'images/lojaG.jpg',
                          'Lanchonete', 'Gourmet')),
                ),
                Text(
                  snapshot.data['status'] == true
                      ? 'Estabelecimento ABERTO'
                      : 'Estabelecimento FECHADO',
                  style: TextStyle(
                      color: snapshot.data['status'] == true
                          ? Colors.greenAccent[700]
                          : Colors.red),
                )
              ],
            );
          }
        });
  }
}

class PizzaMaitaTile extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return StreamBuilder<DocumentSnapshot>(
        stream: Firestore.instance
            .collection('statusStore')
            .document('statusLoja09')
            .snapshots(),
        builder: (context, snapshot) {
          if (!snapshot.hasData) {
            return Center(
              child: CircularProgressIndicator(),
            );
          } else {
            return Column(
              children: <Widget>[
                Padding(
                  padding: EdgeInsets.only(left: 10, top: 4, right: 10),
                  child: InkWell(
                      onTap: snapshot.data['status'] == false
                          ? null
                          : () {
                              Navigator.of(context).push(MaterialPageRoute(
                                  builder: (context) => StorePizzaMaitaTab()));
                            },
                      child: _buildItens(context, 'images/lojaI.jpg',
                          'Pizzaria Delivery', 'Pizza Oxente')),
                ),
                Text(
                  snapshot.data['status'] == true
                      ? 'Estabelecimento ABERTO'
                      : 'Estabelecimento FECHADO',
                  style: TextStyle(
                      color: snapshot.data['status'] == true
                          ? Colors.greenAccent[700]
                          : Colors.red),
                )
              ],
            );
          }
        });
  }
}

class LeChefTile extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return StreamBuilder<DocumentSnapshot>(
        stream: Firestore.instance
            .collection('statusStore')
            .document('statusLoja08')
            .snapshots(),
        builder: (context, snapshot) {
          if (!snapshot.hasData) {
            return Center(
              child: CircularProgressIndicator(),
            );
          } else {
            return Column(
              children: <Widget>[
                Padding(
                  padding: EdgeInsets.only(left: 10, top: 4, right: 10),
                  child: InkWell(
                      onTap: snapshot.data['status'] == false
                          ? null
                          : () {
                              Navigator.of(context).push(MaterialPageRoute(
                                  builder: (context) => StoreLeChefTab()));
                            },
                      child: _buildItens(
                          context, 'images/lojaH.jpg', 'Pizzaria', 'Chef')),
                ),
                Text(
                  snapshot.data['status'] == true
                      ? 'Estabelecimento ABERTO'
                      : 'Estabelecimento FECHADO',
                  style: TextStyle(
                      color: snapshot.data['status'] == true
                          ? Colors.greenAccent[700]
                          : Colors.red),
                )
              ],
            );
          }
        });
  }
}

class LojaJ extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return StreamBuilder<DocumentSnapshot>(
        stream: Firestore.instance
            .collection('statusStore')
            .document('statusLoja10')
            .snapshots(),
        builder: (context, snapshot) {
          if (!snapshot.hasData) {
            return Center(
              child: CircularProgressIndicator(),
            );
          } else {
            return Column(
              children: <Widget>[
                Padding(
                  padding: EdgeInsets.only(left: 10, top: 4, right: 10),
                  child: InkWell(
                      onTap: snapshot.data['status'] == false
                          ? null
                          : () {
                              Navigator.of(context).push(MaterialPageRoute(
                                  builder: (context) => StoreLojaJTab()));
                            },
                      child: _buildItens(context, 'images/lojaJ.jpg', 'Doceria',
                          'Sabores Delícia')),
                ),
                Text(
                  snapshot.data['status'] == true
                      ? 'Estabelecimento ABERTO'
                      : 'Estabelecimento FECHADO',
                  style: TextStyle(
                      color: snapshot.data['status'] == true
                          ? Colors.greenAccent[700]
                          : Colors.red),
                )
              ],
            );
          }
        });
  }
}

class LojaL extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return StreamBuilder<DocumentSnapshot>(
        stream: Firestore.instance
            .collection('statusStore')
            .document('statusLoja11')
            .snapshots(),
        builder: (context, snapshot) {
          if (!snapshot.hasData) {
            return Center(
              child: CircularProgressIndicator(),
            );
          } else {
            return Column(
              children: <Widget>[
                Padding(
                  padding: EdgeInsets.only(left: 10, top: 4, right: 10),
                  child: InkWell(
                      onTap: snapshot.data['status'] == false
                          ? null
                          : () {
                              Navigator.of(context).push(MaterialPageRoute(
                                  builder: (context) => StoreLojaLTab()));
                            },
                      child: _buildItens(context, 'images/lojaL.jpg',
                          'Farmácia', 'Pague Pouco')),
                ),
                Text(
                  snapshot.data['status'] == true
                      ? 'Estabelecimento ABERTO'
                      : 'Estabelecimento FECHADO',
                  style: TextStyle(
                      color: snapshot.data['status'] == true
                          ? Colors.greenAccent[700]
                          : Colors.red),
                )
              ],
            );
          }
        });
  }
}

class LojaM extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return StreamBuilder<DocumentSnapshot>(
        stream: Firestore.instance
            .collection('statusStore')
            .document('statusLoja12')
            .snapshots(),
        builder: (context, snapshot) {
          if (!snapshot.hasData) {
            return Center(
              child: CircularProgressIndicator(),
            );
          } else {
            return Column(
              children: <Widget>[
                Padding(
                  padding: EdgeInsets.only(left: 10, top: 4, right: 10),
                  child: InkWell(
                      onTap: snapshot.data['status'] == false
                          ? null
                          : () {
                              Navigator.of(context).push(MaterialPageRoute(
                                  builder: (context) => StoreLojaMTab()));
                            },
                      child: _buildItens(context, 'images/lojaM.jpg', 'Padaria',
                          'Sabores do Pão')),
                ),
                Text(
                  snapshot.data['status'] == true
                      ? 'Estabelecimento ABERTO'
                      : 'Estabelecimento FECHADO',
                  style: TextStyle(
                      color: snapshot.data['status'] == true
                          ? Colors.greenAccent[700]
                          : Colors.red),
                )
              ],
            );
          }
        });
  }
}

class LojaN extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return StreamBuilder<DocumentSnapshot>(
        stream: Firestore.instance
            .collection('statusStore')
            .document('statusLoja13')
            .snapshots(),
        builder: (context, snapshot) {
          if (!snapshot.hasData) {
            return Center(
              child: CircularProgressIndicator(),
            );
          } else {}
          return Column(
            children: <Widget>[
              Padding(
                padding: EdgeInsets.only(left: 10, top: 4, right: 10),
                child: InkWell(
                    onTap: snapshot.data['status'] == false
                        ? null
                        : () {
                            Navigator.of(context).push(MaterialPageRoute(
                                builder: (context) => StoreLojaNTab()));
                          },
                    child: _buildItens(context, 'images/lojaN.jpg', 'Armazém',
                        'João Ferragens')),
              ),
              Text(
                snapshot.data['status'] == true
                    ? 'Estabelecimento ABERTO'
                    : 'Estabelecimento FECHADO',
                style: TextStyle(
                    color: snapshot.data['status'] == true
                        ? Colors.greenAccent[700]
                        : Colors.red),
              )
            ],
          );
        });
  }
}

class LojaO extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return StreamBuilder<DocumentSnapshot>(
        stream: Firestore.instance
            .collection('statusStore')
            .document('statusLoja14')
            .snapshots(),
        builder: (context, snapshot) {
          if (!snapshot.hasData) {
            return Center(child: CircularProgressIndicator());
          } else {
            return Column(
              children: <Widget>[
                Padding(
                  padding: EdgeInsets.only(left: 10, top: 4, right: 10),
                  child: InkWell(
                      onTap: snapshot.data['status'] == false
                          ? null
                          : () {
                              Navigator.of(context).push(MaterialPageRoute(
                                  builder: (context) => StoreLojaOTab()));
                            },
                      child: _buildItens(context, 'images/lojaO.jpg', 'Bar',
                          'Tô Perto de Casa')),
                ),
                Text(
                  snapshot.data['status'] == true
                      ? 'Estabelecimento ABERTO'
                      : 'Estabelecimento FECHADO',
                  style: TextStyle(
                      color: snapshot.data['status'] == true
                          ? Colors.greenAccent[700]
                          : Colors.red),
                )
              ],
            );
          }
        });
  }
}

class LojaP extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return StreamBuilder<DocumentSnapshot>(
        stream: Firestore.instance
            .collection('statusStore')
            .document('statusLoja15')
            .snapshots(),
        builder: (context, snapshot) {
          if (!snapshot.hasData) {
            return Center(
              child: CircularProgressIndicator(),
            );
          } else {
            return Column(
              children: <Widget>[
                Padding(
                  padding: EdgeInsets.only(left: 10, top: 4, right: 10),
                  child: InkWell(
                      onTap: snapshot.data['status'] == false
                          ? null
                          : () {
                              Navigator.of(context).push(MaterialPageRoute(
                                  builder: (context) => StoreLojaPTab()));
                            },
                      child: _buildItens(context, 'images/lojaP.jpg',
                          'Papelaria', 'Happylândia')),
                ),
                Text(
                  snapshot.data['status'] == true
                      ? 'Estabelecimento ABERTO'
                      : 'Estabelecimento FECHADO',
                  style: TextStyle(
                      color: snapshot.data['status'] == true
                          ? Colors.greenAccent[700]
                          : Colors.red),
                )
              ],
            );
          }
        });
  }
}

Widget _buildItens(context, imgStore, preName, storeName) {
  return //Card(
      //margin: EdgeInsets.symmetric(horizontal: 2, vertical: 1),
      //elevation: 1,
      /*child:*/ Padding(
          padding: EdgeInsets.all(4),
          child: Container(
            child: Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: <Widget>[
                Container(
                    child: Row(children: [
                  Container(
                    height: 70,
                    width: 70,
                    decoration: BoxDecoration(
                      image: DecorationImage(image: AssetImage(imgStore)),
                      border: Border.all(
                          color: Colors.grey[400],
                          style: BorderStyle.solid,
                          width: 1),
                      borderRadius: BorderRadius.circular(4),
                    ),
                  ),
                  SizedBox(width: 10),
                  Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: <Widget>[
                      Text(preName,
                          style:
                              TextStyle(fontSize: 14, color: Colors.grey[600])),
                      Text(
                        storeName,
                        style: TextStyle(
                            fontSize: 16,
                            fontWeight: FontWeight.bold,
                            color: Colors.grey[800]),
                      ),
                    ],
                  ),
                ])),
                //Icon(Icons.store, color: Colors.grey[500], size: 18),
              ],
            ),
          )); //);
}

Answer 1

您可以尝试使用snapshots.data.documents.data()["status"]。您可能会在类似的问题here

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