当我尝试从另一个类中获取函数时出现此错误：
error: The method 'sheduledNotification' isn't defined for the type '_MedicinesState'. (undefined_method at [epicare] lib\Medicines.dart:73)
我正在将我的药物详细信息保存到 firebase，现在我想显示已保存在 firebase 中的所有药物当时的提醒，因此我正在使用 for 循环来一一获取所有药物并显示提醒，但是当我尝试获取 Medicinies Class 中 'sheduledNotification' 类的函数 NotificationService 时，它给了我错误。请帮助我如何避免此错误并获取药物类中的函数
我使用函数调用本地通知的代码，该函数位于void loadData()：
import 'package:epicare/AddMedicineScreen.dart';
import 'package:epicare/Homepage.dart';
import 'package:epicare/services/notifications.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:firebase_database/firebase_database.dart';
import 'package:flutter/material.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
import 'package:intl/intl.dart';
import 'package:provider/provider.dart';
import 'services/notifications.dart';
import 'MedicneClass.dart';
class Medicines extends StatefulWidget {
@override
_MedicinesState createState() => _MedicinesState();
}
class _MedicinesState extends State<Medicines> with TickerProviderStateMixin {
TabController _tabController;
var _selectedIndex = 0;
//Firebase
FirebaseAuth firebaseAuth = FirebaseAuth.instance;
final ref = FirebaseDatabase.instance.reference();
User cuser = FirebaseAuth.instance.currentUser;
final fb = FirebaseDatabase.instance.reference().child("User_data");
void loadData()
{
fb.reference()
..child(cuser.uid)
.child('Medicines')
.once()
.then((DataSnapshot snapshot) {
var data = snapshot.value;
med_list = List();
if (data != null) {
data.forEach((key, value) {
MedicineList med_history = new MedicineList(
userMed: value['medicine_name'],
userDosage: value['dosage'],
userFreq: value['frequency'],
userReminder: value['reminder'],
userSdate: value['medicine_start_date'],
userEdate: value['medicine_end_date'],
key: key,
);
med_list.add(med_history);
});
setState(() {
print("Medicines Present");
});
for(int i = 0; i<med_list.length; i++)
{
String result = med_list[i].userReminder.replaceAll(RegExp('\\s+'), ' ');
print(result);
// parse date
//DateTime time= DateFormat.jm().parse(result);
DateTime date2= DateFormat("hh:mma").parse(result);
// format date
//print(DateFormat("HH:mm").format(time));
print(DateFormat("HH:mm").format(date2));
String ti = DateFormat("HH:mm").format(date2);
var hms = ti.split(':');
var hours = int.parse(hms[0]);
var m = hms[1];
var min = m.split(' ');
var minutes = int.parse(min[0]);
var time = Time(hours, minutes, 0);
String name = med_list[i].userMed;
String k = med_list[i].key;
sheduledNotification(time,name,k);
}
}
});
}
List<MedicineList> med_list = List();
@override
void initState() {
loadData();
super.initState();
_tabController = TabController(length: 2, vsync: this)
..addListener(() {
setState(() {
_selectedIndex = _tabController.index;
});
});
}
@override
void dispose() {
super.dispose();
_tabController.dispose();
}
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.white,
appBar: AppBar(
backgroundColor: const Color(0xffE5E0A1),
elevation: 0,
centerTitle: true,
title: Text(
"Medicines",
style: TextStyle(
fontSize: 15.0,
color: Colors.black,
fontFamily: 'Montserrat',
fontWeight: FontWeight.normal,
),
),
leading: IconButton(
icon: Icon(
Icons.arrow_back,
color: Colors.black,
),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) {
return Homepage();
},
),
);
},
),
),
body: Column(
children: [
// give the tab bar a height [can change height to preferred height]
Container(
margin: EdgeInsets.only(top: 32, right: 45, left: 45),
height: 45,
decoration: BoxDecoration(
color: const Color(0xffE5E0A1),
borderRadius: BorderRadius.circular(
18.0,
),
border: Border.all(width: 1.0, color: const Color(0xff2f363d)),
),
child: TabBar(
controller: _tabController,
// give the indicator a decoration (color and border radius)
indicator: BoxDecoration(
borderRadius: BorderRadius.circular(
17.0,
),
color: Colors.black,
),
labelColor: const Color(0xffd4d411),
unselectedLabelColor: Colors.black,
tabs: [
// first tab [you can add an icon using the icon property]
Tab(
child: Text(
'Medicine',
style: TextStyle(
fontFamily: 'Montserrat',
fontSize: 16,
//color: const Color(0xffd4d411),
letterSpacing: 0.48,
),
textAlign: TextAlign.left,
),
),
// second tab [you can add an icon using the icon property]
Tab(
child: Text(
'History',
style: TextStyle(
fontFamily: 'Montserrat',
fontSize: 16,
//color: const Color(0xffd4d411),
letterSpacing: 0.48,
),
textAlign: TextAlign.left,
),
),
],
),
),
// tab bar view her
Expanded(
child: TabBarView(
controller: _tabController,
children: <Widget>[
med_list.length == 0
? noMedicine()
: ListView.separated(
physics: NeverScrollableScrollPhysics(),
shrinkWrap: true,
primary: false,
itemBuilder: (context, index) {
return MedicinesList(
med_list[index].userSdate,
med_list[index].userReminder,
med_list[index].userEdate,
med_list[index].userFreq,
med_list[index].userDosage,
med_list[index].userMed,
med_list[index].key);
},
separatorBuilder: (_, __) => Container(),
itemCount: med_list.length,
),
// second tab bar view widget
Container(
padding: EdgeInsets.only(right: 32, left: 32),
child: MedHistory(),
),
],
),
),
],
),
floatingActionButton: _selectedIndex > 0
? Container()
: FloatingActionButton(
child: Icon(
Icons.add,
size: 40,
),
backgroundColor: const Color(0xffd4d411),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) {
return AddMedicine();
},
),
);
},
),
);
}
// Widget Medicine() {
// print("MedicineList ${med_list.length}");
// med_list.length == 0
// ? noMedicine()
// : ListView.separated(
// physics: NeverScrollableScrollPhysics(),
// padding: EdgeInsets.symmetric(vertical: 11, horizontal: 20),
// shrinkWrap: true,
// primary: false,
// itemBuilder: (context, index) {
// return MedicinesList(
// med_list[index].userSdate,
// med_list[index].userReminder,
// med_list[index].userEdate,
// med_list[index].userFreq,
// med_list[index].userDosage,
// med_list[index].userMed,
// med_list[index].key);
// },
// separatorBuilder: (_, __) => Container(),
// itemCount: med_list.length,
// );
// }
Widget noMedicine() {
return Center(
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
Image.asset(("assets/images/Medicine-amico.png")),
SizedBox(
height: 20,
),
Text(
'Hurray! You don\'t have any pending medicines to take!',
style: TextStyle(
fontFamily: 'Montserrat',
fontWeight: FontWeight.w600,
fontSize: 14,
color: const Color(0x78000000),
height: 1.4285714285714286,
),
textAlign: TextAlign.center,
),
],
),
);
}
Widget MedicinesList(String start_date, String reminder, String end_date,
String frequency, String dosage, String medicine_name, String key) {
if(frequency == null)
{
frequency = 'Take when needed';
}
Size size = MediaQuery.of(context).size;
return GestureDetector(
onTap: ()
{
Deletedata(context, key);
},
child: Container(
margin: EdgeInsets.only(top: 25, left: 32, right: 32),
width: size.width * 0.80,
height: 54,
padding: EdgeInsets.symmetric(vertical: 11, horizontal: 20),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(9.0),
color: Colors.white,
boxShadow: [
BoxShadow(
color: const Color(0x29000000),
offset: Offset(0, 3),
blurRadius: 6,
),
],
),
child: Stack(
children: [
Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
'$medicine_name',
style: TextStyle(
fontFamily: 'Montserrat',
fontSize: 12,
fontWeight: FontWeight.w500,
color: const Color(0xff232425),
),
textAlign: TextAlign.left,
),
Text(
'$frequency',
style: TextStyle(
fontFamily: 'Montserrat',
fontSize: 10,
color: const Color(0x80232425),
fontWeight: FontWeight.w500,
),
textAlign: TextAlign.left,
),
],
),
Container(
width: size.width,
child: Column(
crossAxisAlignment: CrossAxisAlignment.end,
children: [
Text(
'$dosage',
style: TextStyle(
fontFamily: 'Montserrat',
fontSize: 10,
fontWeight: FontWeight.w600,
color: const Color(0x80515559),
),
textAlign: TextAlign.left,
),
],
),
),
],
),
),
);
}
Widget MedHistory() {
return Center(
child: Column(
children: [
Image.asset(("assets/images/Time management-pana.png")),
Text(
'You have no data here!\nPlease complete your prescriptions',
style: TextStyle(
fontFamily: 'Montserrat',
fontWeight: FontWeight.w600,
fontSize: 14,
color: const Color(0x78000000),
height: 1.4285714285714286,
),
textAlign: TextAlign.center,
),
],
),
);
}
Deletedata(BuildContext context, String key) {
Widget DeleteButton = FlatButton(
onPressed: () {
setState(() {
fb.child(cuser.uid).child('Medicines').child(key).remove();
Navigator.of(context).pop();
loadData();
});
},
child: Text("YES"),
);
Widget DonotDeleteButton = FlatButton(
onPressed: () {
Navigator.of(context).pop();
},
child: Text("NO"),
);
AlertDialog alert = AlertDialog(
title: Text("Delete History"),
content: Text("Do you want to delete this seizure history"),
actions: [
DeleteButton,
DonotDeleteButton,
],
);
showDialog(
context: context,
builder: (BuildContext context) {
return alert;
},
);
}
}
NotificationService 类中定义的函数：
import 'package:flutter/cupertino.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
class NotificationService extends ChangeNotifier {
final FlutterLocalNotificationsPlugin _flutterLocalNotificationsPlugin =
FlutterLocalNotificationsPlugin();
//initilize
Future initialize() async {
FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
FlutterLocalNotificationsPlugin();
AndroidInitializationSettings androidInitializationSettings =
AndroidInitializationSettings("pulse");
IOSInitializationSettings iosInitializationSettings =
IOSInitializationSettings();
final InitializationSettings initializationSettings =
InitializationSettings(androidInitializationSettings, iosInitializationSettings);
await flutterLocalNotificationsPlugin.initialize(initializationSettings);
}
//Scheduled Notification
Future sheduledNotification(Time time, String name, String key) async {
//var time = Time(00, 35, 0);
var androidPlatformChannelSpecifics =
AndroidNotificationDetails(key,
'repeatDailyAtTime channel name', 'repeatDailyAtTime description');
var iOSPlatformChannelSpecifics =
IOSNotificationDetails();
var platformChannelSpecifics = NotificationDetails(
androidPlatformChannelSpecifics, iOSPlatformChannelSpecifics);
await _flutterLocalNotificationsPlugin.showDailyAtTime(
0,
'Reminder',
'Time to eat your medicine ${(time.hour)}:${(time.minute)}:${(time.second)}',
time,
platformChannelSpecifics);
}
}
答案 0 :(得分：0)
如果您正在使用提供程序包，并已声明 ChangeNotifierProvider，请使用 Provider.of<NotificationService>(context).sheduledNotification(..) 或 Consumer 小部件。