I first cleared all the cache records. When I executed my APP for the first login, the code popped up an error saying that foreach mothod is equal to null, but I can read the data when I jump to other pages. I can’t understand the reason. What can I do to solve this problam?
this is my code
path reference
advanced() async {
final FirebaseAuth _auth = FirebaseAuth.instance;
final FirebaseUser currentUser = await _auth.currentUser();
final db = Firestore.instance;
(new Offline(currentUser.uid)).getData().then((data) { //call data at this line
var vip = new Vip(currentUser.uid);
vip.isVip().then((vipStatus) {
if (vipStatus) {
setState(() {
_advancedWidget = Container(
child: Center(
child: Container(
padding: const EdgeInsets.only(left: 8.0, top: 8),
child: Text(
'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX',
style: AppTheme.getTextStyle(themeData.textTheme.subtitle1,
fontWeight: FontWeight.w500),
maxLines: 5,
),
),
),
);
});
for (var course in data['course']) {
if (course['start'].millisecondsSinceEpoch <=
DateTime.now().millisecondsSinceEpoch &&
DateTime(
DateTime.fromMillisecondsSinceEpoch(
course['start'].millisecondsSinceEpoch)
.year,
DateTime.fromMillisecondsSinceEpoch(
course['start'].millisecondsSinceEpoch)
.month,
DateTime.fromMillisecondsSinceEpoch(
course['start'].millisecondsSinceEpoch)
.day +
course['period'] -
1,
23,
59,
00)
.millisecondsSinceEpoch >=
DateTime.now().millisecondsSinceEpoch) {
// 期間內
final dayFromRegister = ((DateTime(DateTime.now().year, DateTime.now().month, DateTime.now().day).millisecondsSinceEpoch -
course['start'].millisecondsSinceEpoch) /
1000 /
60 /
60 /
24)
.round();
_advancedList.clear();
for (var i = 0; i < 28; i++) {
DateTime date = DateTime(DateTime.now().year, DateTime.now().month, DateTime.now().day)
.add(new Duration(days: (dayFromRegister - i) * -1));
List<dynamic> result = data['records'].reversed.toList();
int completion = 0;
for (var r in result) {
if (r['year'] == date.year &&
r['month'] == date.month &&
r['day'] == date.day &&
r['time_period'] == 'am') {
completion += 1;
break;
}
}
for (var r in result) {
if (r['year'] == date.year &&
r['month'] == date.month &&
r['day'] == date.day &&
r['time_period'] == 'pm') {
completion += 1;
break;
}
}
setState(() {
_advancedList.add({
'index': i,
'name': '第 ${i + 1} 天',
'date':
'${date.year}/${date.month < 10 ? '0${date.month}' : date.month}/${date.day < 10 ? '0${date.day}' : date.day}',
'_date': date,
'completion': completion,
});
});
}
setState(() {
_advancedWidget = Container(
child: Container(
child: ListView(
children: <Widget>[
if (data['advanceType'] != null)
Container(
margin: EdgeInsets.all(4),
child: Center(
child: Text('進階肌膚分類: ${data['advanceType']}', style: TextStyle(fontSize: 18),),
),
),
for (var AList in _advancedList)
InkWell(
child: Card(
margin: EdgeInsets.all(4),
color: AList['completion'] > 0
? Colors.lightGreen
: themeData.cardColor,
child: Row(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Expanded(
child: Column(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment:
CrossAxisAlignment.start,
children: <Widget>[
Container(
padding: const EdgeInsets.only(
left: 8.0, top: 8),
child: Text(
'${AList['name']}',
style: AppTheme.getTextStyle(
themeData.textTheme.subtitle1,
fontWeight: FontWeight.w500),
maxLines: 5,
),
),
Container(
padding: const EdgeInsets.only(
left: 8.0, top: 8, bottom: 8),
child: Text(
'${AList['date']}',
style: AppTheme.getTextStyle(
themeData.textTheme.subtitle2,
fontWeight: FontWeight.w400),
maxLines: 5,
),
),
],
),
),
Padding(
padding:
const EdgeInsets.fromLTRB(0, 0, 10, 0),
child: Icon(
AList['completion'] == 0
? MdiIcons.circleOutline
: AList['completion'] == 1
? MdiIcons.circleHalfFull
: MdiIcons.circle,
color: themeData.colorScheme.onBackground
.withAlpha(200),
size: 24.0,
),
),
],
),
),
onTap: () {
if (DateTime.parse(AList['_date'].toString())
.isBefore(DateTime.now())) {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => Advanced(
index: AList['index'],
date: AList['_date'])));
}
},
)
],
),
),
);
});
}
}
} else {
// 期間內
_advancedList.clear();
for (var i = 0; i < 28; i++) {
DateTime date = DateTime.now().add(new Duration(days: i));
setState(() {
_advancedList.add({
'index': i,
'name': '第 ${i + 1} 天',
'date':
'${date.year}/${date.month < 10 ? '0${date.month}' : date.month}/${date.day < 10 ? '0${date.day}' : date.day}',
'_date': date,
'completion': 0,
});
});
}
setState(() {
_advancedWidget = Container(
child: Container(
child: ListView.builder(
itemCount: _advancedList.length,
itemBuilder: (context, index) {
return InkWell(
child: Card(
margin: EdgeInsets.all(4),
color: _advancedList[index]['completion'] > 0
? Colors.lightGreen
: themeData.cardColor,
child: Row(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Expanded(
child: Column(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Container(
padding: const EdgeInsets.only(
left: 8.0, top: 8),
child: Text(
'${_advancedList[index]['name']}',
style: AppTheme.getTextStyle(
themeData.textTheme.subtitle1,
fontWeight: FontWeight.w500),
maxLines: 5,
),
),
Container(
padding: const EdgeInsets.only(
left: 8.0, top: 8, bottom: 8),
child: Text(
'${_advancedList[index]['date']}',
style: AppTheme.getTextStyle(
themeData.textTheme.subtitle2,
fontWeight: FontWeight.w400),
maxLines: 5,
),
),
],
),
),
Padding(
padding: const EdgeInsets.fromLTRB(0, 0, 10, 0),
child: Icon(
_advancedList[index]['completion'] == 0
? MdiIcons.circleOutline
: _advancedList[index]['completion'] == 1
? MdiIcons.circleHalfFull
: MdiIcons.circle,
color: themeData.colorScheme.onBackground
.withAlpha(200),
size: 24.0,
),
),
],
),
),
onTap: () {},
);
},
),
),
);
});
}
});
});
import
