Flutter Firebase: not able update Database - flutter

Question

I want to update my Collection with an NumberPicker in a Alert Dialog. I do not get any errors in code or from the emulator. When i press the button to update the code the terminal do not give any errors. Everything looks fine but for some reason i do not work. When you need more Information just leave a comment with what you excactly need. :)
import 'package:flutter/material.dart';
import 'package:numberpicker/numberpicker.dart';
import 'package:percent_indicator/circular_percent_indicator.dart';
import 'package:testapp/services/Services.dart';
import 'models/Goals.dart';
class Statistics extends StatefulWidget {
#override
_StatisticsState createState() => _StatisticsState();
}
class _StatisticsState extends State<Statistics> {
int _currentFirstValue = 1;
int totalFirst;
#override
Widget build(BuildContext context) {
return Scaffold(
body: Container(
height: 260,
child: StreamBuilder(
stream: FirestoreService().getGoals(),
builder: (context, AsyncSnapshot<List<Goal>> snapshot) {
if (snapshot.hasError || !snapshot.hasData) {
return Center(child: CircularProgressIndicator(
backgroundColor: Color(0XFF1954A1),
));
}
return ListView.builder(
scrollDirection: Axis.horizontal,
itemCount: 1,
itemBuilder: (BuildContext context, int index) {
// ignore: missing_return
Goal goal = snapshot.data[index];
return Row(
children: <Widget>[
Container(
padding: EdgeInsets.all(10),
margin: EdgeInsets.symmetric(horizontal: 20, vertical: 20),
height: 230,
width: 350,
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.all(Radius.circular(10.0)),
boxShadow: [
BoxShadow(
color: Colors.grey[300],
offset: const Offset(0.5, 1),
blurRadius: 4.0,
spreadRadius: 0.1,
),
]),
child: Column(
children: <Widget>[
Row(
children: <Widget>[
Text('WeekGoals', style: TextStyle(
fontSize: 25,
fontWeight: FontWeight.w500,
),),
SizedBox(width: 100),
SizedBox(
height: 20,
width: 87,
child: FlatButton(
child: Text('edit', style: TextStyle(
fontSize: 17,
color: Colors.yellow[700]
),),
onPressed: () {
return showDialog(
context: context,
barrierDismissible: true,
builder: (context) => AlertDialog(
content: Column(
children: <Widget>[
Text('weekly goals'),
NumberPicker.integer(
initialValue: _currentFirstValue,
minValue: 1,
maxValue: 100,
onChanged: (newGoal) => setState(() => {
_currentFirstValue = newGoal,
totalFirst = _currentFirstValue,
})
),
Row(
children: <Widget>[
RaisedButton(
child: Text('edit goals'),
onPressed: () async {
Goal goal = Goal(
weekActivityGoal: totalFirst,
);
await FirestoreService().updateGoal(goal);
Navigator.pop(context, false);
},
),
FlatButton(
child: Text('Close'),
onPressed: () {
Navigator.pop(context, false);
},
)
],
)
],
),
)
);
},
),
)
],
),
SizedBox(height: 10),
Row(
children: <Widget>[
Container(
padding: EdgeInsets.symmetric(horizontal: 17.5),
child: CircularPercentIndicator(
header: Text('activitys', style: TextStyle(
fontSize: 17,
),),
radius: 130,
progressColor: Colors.red,
lineWidth: 8,
backgroundColor: Colors.grey[200],
percent: goal.weekActivity*100/goal.weekActivityGoal,
center: Text('${goal.weekActivity}/${goal.weekActivityGoal}'),
),
),
],
),
],
),
),
],
);
});
}),
),
);
}
}

Answer 1

Here this has been helping a lot of people try i out might help you too.
StreamBuilder(
stream: Firestore.instance.collection('Hearings').snapshots(),
builder: (context, snapshot) {
if (snapshot.hasError) return Text('Error: ${snapshot.error}');
switch (snapshot.connectionState) {
case ConnectionState.none:
return Text('Select lot');
case ConnectionState.waiting:
return Text('Awaiting bids...');
case ConnectionState.active:
{
print('active');
return Text('${snapshot.data}');
}
case ConnectionState.done:
{
print('Done');
return _buildList(context, snapshot.data);
}
}
return null;
}),
));
}
Widget _buildList(BuildContext context, List<DocumentSnapshot> snapshot) {
return ListView(
padding: const EdgeInsets.only(top: 20.0),
children: snapshot.map((data) => _buildListItem(context, data)).toList(),
);
}
Widget _buildListItem(BuildContext context, DocumentSnapshot data) {
final record = Record.fromSnapshot(data);
return Padding(
key: ValueKey(record.name),
padding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 8.0),
child: Container(
decoration: BoxDecoration(
border: Border.all(color: Colors.grey),
borderRadius: BorderRadius.circular(5.0),
),
child: ListTile(
title: Text(record.name),
trailing: Text(record.votes.toString()),
onTap: () => Firestore.instance.runTransaction((transaction) async {
final freshSnapshot = await transaction.get(record.reference);
final fresh = Record.fromSnapshot(freshSnapshot);
await transaction
.update(record.reference, {'votes': fresh.votes + 1});
}),
),
),
);
}
}
class Record {
final String name;
final int votes;
final DocumentReference reference;
Record.fromMap(Map<String, dynamic> map, {this.reference})
: assert(map['name'] != null),
assert(map['votes'] != null),
name = map['name'],
votes = map['votes'];
Record.fromSnapshot(DocumentSnapshot snapshot)
: this.fromMap(snapshot.data, reference: snapshot.reference);
#override
String toString() => "Record<$name:$votes>";
}
This is where the link this info came from.