我用flutter编程一个应用程序，我有点卡在ATM机上。我在想：我有一个主屏幕，它有一个浮动AcctionButton。如果你按下这个，另一个屏幕将打开，在那里你可以写一些数据（可以把它想象成一个公式）。只要你在第二个屏幕中按下保存按钮，一个ciruclar文件就会在主屏幕中创建，它的功能就像一个容器，保存公式的地方。应该可以有几个公式，所以你把它们放在一起。
这是我的代码：

首页

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import '../widgets/add_goal_button.dart';
import '../widgets/goal_app_bar.dart';

class HomescreenWidget extends StatefulWidget {
  const HomescreenWidget({Key? key}) : super(key: key);

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

class _HomescreenWidgetState extends State<HomescreenWidget> {
  final scaffoldKey = GlobalKey<ScaffoldState>();
  late FocusNode unfocusNode;

  @override
  void initState() {
    super.initState();
    unfocusNode = FocusNode();
  }

  @override
  void dispose() {
    unfocusNode.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    if (Theme.of(context).platform == TargetPlatform.iOS) {
      SystemChrome.setSystemUIOverlayStyle(
        SystemUiOverlayStyle(
          statusBarBrightness: Theme.of(context).brightness,
          systemStatusBarContrastEnforced: true,
        ),
      );
    }

    return GestureDetector(
      onTap: () => unfocusNode.canRequestFocus
          ? FocusScope.of(context).requestFocus(unfocusNode)
          : FocusScope.of(context).unfocus(),
      child: Scaffold(
        backgroundColor: Colors.white,
        key: scaffoldKey,
        appBar: GoalAppBar(),
        body: SafeArea(
          top: true,
          child: Stack(
            children: [
              AddGoalButton(),
            ],
          ),
        ),
      ),
    );
  }
}

字符串

清单

import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:flutter/services.dart';
import '../utils/theme_utils.dart';
import 'dart:io';

import 'homescreen.dart';

class Checklist extends StatefulWidget {
  const Checklist({super.key});

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

class _ChecklistState extends State<Checklist> {
  List<bool> checkBoxValues = [false, false, false, false, false];
  File? selectedImage;

  Future<void> _pickImage() async {
    final imagePicker = ImagePicker();
    try {
      final pickedFile = await imagePicker.pickImage(source: ImageSource.gallery);
      if (pickedFile != null) {
        setState(() {
          selectedImage = File(pickedFile.path);
        });
      }
    } on PlatformException catch (e) {
      print("Fehler beim Bildauswählen: $e");
    }
  }

  void _createCircleDiagram() {
    Navigator.push(
      context,
      MaterialPageRoute(builder: (context) => const HomescreenWidget()),
      //TODO
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("Ziel"),
        backgroundColor: ThemeUtils.baseColor,
        actions: [
          IconButton(
            icon: const Icon(Icons.save),
            onPressed: () {
              _createCircleDiagram();
            },
          ),
        ],
      ),
      body: SingleChildScrollView(
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            const Padding(
              padding: EdgeInsets.all(16.0),
              child: Text(
                "Mein SMARTes Ziel",
                style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
              ),
            ),
            Container(
              margin: const EdgeInsets.all(16),
              padding: const EdgeInsets.all(8),
              decoration: BoxDecoration(
                border: Border.all(color: Colors.grey),
              ),
              child: const TextField(
                keyboardType: TextInputType.multiline,
                maxLines: null,
                decoration: InputDecoration(
                  hintText: "Dein Text hier...",
                  border: InputBorder.none,
                ),
              ),
            ),
            const Padding(
              padding: EdgeInsets.all(16.0),
              child: Text(
                "Aktivitäten",
                style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
              ),
            ),
            Container(
              margin: const EdgeInsets.all(16),
              child: Column(
                children: List.generate(5, (index) {
                  return Row(
                    children: [
                      Checkbox(
                        value: checkBoxValues[index],
                        onChanged: (bool? value) {
                          setState(() {
                            checkBoxValues[index] = value ?? false;
                          });
                        },
                      ),
                      Expanded(
                        child: Container(
                          margin: const EdgeInsets.only(left: 8),
                          padding: const EdgeInsets.all(8),
                          decoration: BoxDecoration(
                            border: Border.all(color: Colors.grey),
                          ),
                          child: TextField(
                            keyboardType: TextInputType.multiline,
                            maxLines: null,
                            decoration: InputDecoration(
                              hintText: "Aktivität $index...",
                              border: InputBorder.none,
                            ),
                          ),
                        ),
                      ),
                    ],
                  );
                }),
              ),
            ),
            const Padding(
              padding: EdgeInsets.all(16.0),
              child: Text(
                "Mein Glaube",
                style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
              ),
            ),
            Container(
              margin: const EdgeInsets.all(16),
              child: GestureDetector(
                onTap: _pickImage,
                child: Container(
                  height: 200,
                  decoration: BoxDecoration(
                    border: Border.all(color: Colors.grey),
                  ),
                  child: selectedImage != null
                      ? Image.file(selectedImage!)
                      : const Center(
                    child: Text("Bild auswählen"),
                  ),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}

型