Reading data from Firebase - Flutter - firebase

Question

I would like to change String to something else in order to read data from firebase.
I have the following code:
enum Answers{GS,FB}
String _value = ''; //Probably, String should be changed.
void _setValue(String value) => setState(() => _value = value); ////Probably, String should be changed.
Future kaleciSec(BuildContext context) async {
switch(
await showDialog(
...
...
StreamBuilder(
stream: Firestore.instance.collection('GS').snapshots(),
builder: (context, snapshot){
if(!snapshot.hasData) return Center (child: CircularProgressIndicator());
return Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
ListTile(
onTap: (){Navigator.pop(context, Answers.GS);}, //selecting GS.
title: Text(snapshot.data.documents[0]['kaleci1'], //showing data from DB
),
),
Divider(
color: Colors.grey,),
ListTile(
onTap: (){Navigator.pop(context, Answers.FB);},
title: Text(snapshot.data.documents[0]['kaleci2'],
),
],
);
},
),
],
),
)
)
{
case Answers.GS:
_setValue('GS'); //I would like connect database here.
break;
case Answers.FB:
_setValue('FB'); //I would like connect database here.
break;
}
My code works without an error. But, I need to show what is selected. Basically, I would like to change _setValue('GS'); to something like _setValue(snapshot.data.documents[0]['kaleci1']); this. Please help me!
I stick on this issue for a few days.

Answer 1

It seems that this is showing "kaleci1", because the _setValue(selected), is only reading the value of the variable and not the valeu from the database.
For you to return the value there, you would need to return the value of the database and add it to a new (or the same variable), so you can use in the _setValue() function.
I believe the code should be something like this:
enum Answers{GS,FB}
String _value = ''; //Probably, String should be changed.
var selected = 'kaleci1';
var valueDB;
void _setValue(String value) => setState(() => _value = value); ////Probably, String should be changed.
Future kaleciSec(BuildContext context) async {
switch(
await showDialog(
...
...
StreamBuilder(
stream: Firestore.instance.collection('GS').snapshots(),
builder: (context, snapshot){
if(!snapshot.hasData) return Center (child: CircularProgressIndicator());
return Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
ListTile(
onTap: (){Navigator.pop(context, Answers.GS);}, //selecting GS.
title: Text(snapshot.data.documents[0][selected], //showing data from DB
valueDB = snapshot.data.documents[0][selected]
),
),
Divider(
color: Colors.grey,),
ListTile(
onTap: (){Navigator.pop(context, Answers.FB);},
title: Text(snapshot.data.documents[0][selected],
valueDB = snapshot.data.documents[0][selected]
),
],
);
},
),
],
),
)
)
{
case Answers.GS:
_setValue(valueDB); //I would like connect database here.
break;
case Answers.FB:
_setValue(valueDB); //I would like connect database here.
break;
}
Please, let me know how that goes!