如何快速地安排本地通知

Question

我无法根据用户选择的时间显示每日本地通知。

要查看我是否忘记了任何权限，我尝试实现一个按钮以立即显示本地通知，并且可以正常工作。

如果安排了通知，则此代码可确保在页面加载时显示

class _LocalNotificationWidgetState extends State<LocalNotificationWidget> {
  final notifications = FlutterLocalNotificationsPlugin();
  Time timePickedtime;
  TimeOfDay _time = TimeOfDay.now();
  TimeOfDay picked;
  var timeText;
  bool showReminder;
  String remindTime;

 @override
  void initState() {
    getReminderTime().then((result) {
      setState(() {
        result != null ? timeText = result : timeText = '00:00';
      });
    });
    getReminder().then((result) {
      setState(() {
        showReminder = result;
      });
    });
    super.initState();
  }

构建时间选择器小部件

   Widget _buildTimePicker() {
    return GestureDetector(
      onTap: () async {
        await _showDailyAtTime(context);
      },
      child: Container(
        decoration: BoxDecoration(
            borderRadius: BorderRadius.all(Radius.circular(5.0)),
            color: Colors.white),
        child: Row(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          children: <Widget>[
            Text(
              timeText != null ? timeText.toString() : '00:00',
              style: TextStyle(fontSize: 50.0, fontWeight: FontWeight.w200),
            ),
            Switch(
              value: showReminder == null ? false : showReminder,
              onChanged: (bool value) {
                setState(() {
                  showReminder = value;
                  setReminder(value);
                });
              },
            ),
          ],
        ),
      ),
    );
  }

调度方法

Future<Null> _showDailyAtTime(BuildContext context) async {
    picked = await showTimePicker(context: context, initialTime: _time);
    if (picked != null && picked != _time) {
      setState(() {
        _time = picked;
      });
    }
    if (picked != null) {
      timePickedtime = Time(picked.hour, picked.minute, 0);
    }

    var androidPlatformChannelSpecifics = AndroidNotificationDetails(
        'repeatDailyAtTime channel id',
        'repeatDailyAtTime channel name',
        'repeatDailyAtTime description');
    var iOSPlatformChannelSpecifics = IOSNotificationDetails();
    var platformChannelSpecifics = NotificationDetails(
        androidPlatformChannelSpecifics, iOSPlatformChannelSpecifics);
    setState(() {
      timeText =
          '${_toTwoDigitString(picked.hour)}:${_toTwoDigitString(picked.minute)}';
      setReminderTime(timeText);
    });

    if (showReminder) {
      await notifications.showDailyAtTime(
          0,
          'Reminder',
          'Have you used this app today? Daily notification shown at approximately ${_toTwoDigitString(picked.hour)}:${_toTwoDigitString(picked.minute)}:',
          timePickedtime,
          platformChannelSpecifics);
    }
  }

在设备上存储时间表

  Future<bool> getReminder() async {
    final SharedPreferences prefs = await SharedPreferences.getInstance();

    return prefs.getBool('showReminder');
  }

  Future<bool> setReminder(bool value) async {
    final SharedPreferences prefs = await SharedPreferences.getInstance();

    return prefs.setBool('showReminder', value);
  }

  Future<bool> setReminderTime(String value) async {
    final SharedPreferences prefs = await SharedPreferences.getInstance();

    return prefs.setString('timeText', value);
  }

  Future<String> getReminderTime() async {
    final SharedPreferences prefs = await SharedPreferences.getInstance();

    return prefs.getString('timeText');
  }