从Flutter应用程序向日历添加活动

import 'package:flutter/material.dart';
import 'package:table_calendar/table_calendar.dart';

class CalendarScreen extends StatefulWidget {
  @override
  _CalendarScreenState createState() => _CalendarScreenState();
}

class _CalendarScreenState extends State<CalendarScreen> {
  CalendarController _calendarController;
  TextEditingController _eventController;
  Map<DateTime, List<dynamic>> _events;

  @override
  void initState() {
    super.initState();
    _calendarController = CalendarController();
    _eventController = TextEditingController();
    _events = {};
  }

  @override
  void dispose() {
    _calendarController.dispose();
    _eventController.dispose();
    super.dispose();
  }

  void _addEvent(DateTime date) {
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        title: Text('Add Event'),
        content: TextField(
          controller: _eventController,
        ),
        actions: [
          FlatButton(
            child: Text('Save'),
            onPressed: () {
              if (_eventController.text.isNotEmpty) {
                setState(() {
                  if (_events[date] != null) {
                    _events[date].add(_eventController.text);
                  } else {
                    _events[date] = [_eventController.text];
                  }
                });
              }
              Navigator.pop(context);
            },
          ),
        ],
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Calendar'),
      ),
      body: Column(
        children: [
          TableCalendar(
            calendarController: _calendarController,
            events: _events,
            onDaySelected: (date, events) {
              _addEvent(date);
            },
          ),
          SizedBox(height: 20),
          Expanded(
            child: ListView.builder(
              itemCount: _events.length,
              itemBuilder: (context, index) {
                DateTime date = _events.keys.elementAt(index);
                List<dynamic> events = _events[date];
                return ListTile(
                  title: Text('${date.day}/${date.month}/${date.year}'),
                  subtitle: Column(
                    children: events.map((event) => Text(event)).toList(),
                  ),
                );
              },
            ),
          ),
        ],
      ),
    );
  }
}