flutter - 我想在我的flutter应用程序中通过onPressed方法生成卡。谁能给我看一个路线图…？

Question

我已经在页面中创建了listview.builder。为此，我设计了我的卡。现在，我想通过单击 float 操作按钮中的onpressed方法在Listveiw.buider中一张一张生成卡片。我应该在压缩后的内容中写哪种方法/功能？以及如何生成卡片以及应该在itemCount和itemBuilder中进行哪些更改。我需要那个路线图。谢谢。

ListView.builder(
      itemCount: 5,
    itemBuilder: (context, index) {
      return Dismissible(
        key:Key(null),
        direction: DismissDirection.startToEnd,
        onDismissed: (direction) {},
        confirmDismiss: (direction) {
          return showDialog(
              context: context, builder: (_) => DeleteCard());
        },
        background: Container(
          color: Colors.red,
          padding: EdgeInsets.only(left: 16),
          child: Icon(
            Icons.delete,
            color: Colors.white,
          ),
          alignment: Alignment.centerLeft,
        ),
        child: Card(
          shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(12.0)),
          color: Colors.white70,
          child: Column(
            children: <Widget>[
              Row(
                children: <Widget>[
                  Container(
                    width: 120,
                    padding: EdgeInsets.all(10.0),
                    child: Text(
                      "Project ",
                      style: TextStyle(
                          fontSize: 11, fontWeight: FontWeight.bold),
                    ),
                  ),
                  Container(
                    padding: EdgeInsets.all(10.0),
                    child: ProjectName(),
                  ),
                ],
              ),

              // item add start

              Container(
                padding: EdgeInsets.all(10.0),
                child: TextFormField(
                  decoration: InputDecoration(
                    hintText: "Item name" ,hintStyle: TextStyle(fontSize: 12),
                  ),
                ),
              ),
              Container(
                padding: EdgeInsets.all(10.0),
                child: TextFormField(
                  decoration: InputDecoration(
                    hintText: "Amount",hintStyle: TextStyle(fontSize: 12),

                  ),
                  keyboardType: TextInputType.number,
                ),
              ),
            ],
          ),
        ),
      );
    }
  ),

Answer 1

我想这是您要寻找的东西。只需将ListTile替换为您自己的Card

import 'package:flutter/material.dart';

void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: HomeScreen(),
    );
  }
}

class HomeScreen extends StatefulWidget {
  @override
  _HomeScreenState createState() => _HomeScreenState();
}

class _HomeScreenState extends State<HomeScreen> {
  var listLength = 1;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Flutter App :)"),
      ),
      floatingActionButton: FloatingActionButton(
          child: Icon(Icons.add),
          onPressed: () {
            setState(() {
              listLength++;
            });
          }),
      body: Container(
          child: ListView.builder(
              itemCount: listLength,
              itemBuilder: (context, index) {
                return ListTile(
                  leading: Text("$index"),
                  title: Text("List Tile as Widget"),
                );
              })),
    );
  }
}