android - 在 flutter 上显示运行时钟

Question

我想知道是否有任何方法可以在 dart 中显示实时时钟？日期和时间(例如 11/14/2018 19:34)和时间将继续运行。

可以从设备本身获取时间。

Answer 1

下面使用intl plugin将时间格式化为 MM/dd/yyyy hh:mm:ss。确保更新您的 pubspec.yaml。

import 'dart:async';
import 'package:flutter/material.dart';
import 'package:intl/intl.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Time Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Time Demo'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  String _timeString;

  @override
  void initState() {
    _timeString = _formatDateTime(DateTime.now());
    Timer.periodic(Duration(seconds: 1), (Timer t) => _getTime());
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Text(_timeString),
      ),
    );
  }

  void _getTime() {
    final DateTime now = DateTime.now();
    final String formattedDateTime = _formatDateTime(now);
    setState(() {
      _timeString = formattedDateTime;
    });
  }

  String _formatDateTime(DateTime dateTime) {
    return DateFormat('MM/dd/yyyy hh:mm:ss').format(dateTime);
  }
}