firebase - 选择或将 Firestore 项目传递到新页面（路由）

Question

我有一个来自我的 Firestore 的文档列表，我可以在其中选中和取消选中尾随复选框。我还有一个带有按钮的底部导航栏，可以将任何“选中”项目包含到新页面或收藏夹部分。我无法想出一种推送和导航所选项目的方法。请参阅下面的链接-谢谢

示例 - 这里

class _SelectScreenState extends State<SelectScreen> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Select Exercises')),
      body: _buildBody(context),
      floatingActionButton: FloatingActionButton.extended(
        elevation: 4.0,
        icon: const Icon(Icons.add),
        label: const Text('Add to workout'),
        onPressed: () {},
      ),
      floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
      bottomNavigationBar: BottomAppBar(
        child: new Row(
          mainAxisSize: MainAxisSize.max,
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          children: <Widget>[
            IconButton(
              icon: Icon(Icons.menu),
              onPressed: () {},
            ),
            IconButton(
              icon: Icon(Icons.search),
              onPressed: () {},
            )
          ],
        ),
      ),
    );
  }

  Widget _buildBody(BuildContext context) {
    return StreamBuilder<QuerySnapshot>(
      stream: Firestore.instance.collection('exercises').snapshots(),
      builder: (context, snapshot) {
        if (!snapshot.hasData) return LinearProgressIndicator();

        return _buildList(context, snapshot.data.documents);
      },
    );
  }

  Widget _buildList(BuildContext context, List<DocumentSnapshot> snapshot) {
    return ListView(
      padding: const EdgeInsets.only(top: 20.0),
      children: snapshot.map((data) => _buildListItem(context, data)).toList(),
    );
  }

  Widget _buildListItem(BuildContext context, DocumentSnapshot data) {
    final record = Record.fromSnapshot(data);


    return Padding(
      key: ValueKey(record.name),
      padding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 8.0),
      child: Container(
        decoration: BoxDecoration(
          border: Border.all(color: Colors.grey),
          borderRadius: BorderRadius.circular(5.0),
        ),
        child: Exercise(
          title: record.name,
        ),
      ),
    );
  }
}


class Exercise extends StatefulWidget {
  final String title;

  Exercise({this.title});

  @override
  _ExerciseState createState() => _ExerciseState();
}

class _ExerciseState extends State<Exercise> {
  bool selected = false;

  @override
  Widget build(BuildContext context) {
    return ListTile(
      title: Text(widget.title),
      trailing: Checkbox(
          value: selected,
          onChanged: (bool val) {
            setState(() {
              selected = val;
            });
          }),
    );
  }
}

class Record {
  final String name;
  final DocumentReference reference;

  Record.fromMap(Map<String, dynamic> map, {this.reference})
      : assert(map['name'] != null),
        name = map['name'];

  Record.fromSnapshot(DocumentSnapshot snapshot)
      : this.fromMap(snapshot.data, reference: snapshot.reference);

  @override
  String toString() => "Record<$name:>";
}

标签： firebaseflutterdartgoogle-cloud-firestore