Having issue with my favorite button functionality in flutter - flutter

Question

I am having an issue with my favorite button. I have connected it with real-time firebase and each time I press the favorite icon it changes the state in firebase either true or false. when I press the heart button it always shows me different output sometimes it becomes red or black without affecting the other and sometimes it changes the other ones too (red or black). I have tried a lot to solve this but I am unable to get a solution for it.
class Home_page extends StatefulWidget {
#override
State<Home_page> createState() => _Home_pageState();
}
class _Home_pageState extends State<Home_page> {
//late StreamSubscription _dailySpecialStream;
var clr = Colors.grey;
//var item;
final List<String> _listItem = [
'assets/audi3.png',
'assets/audi.png',
'assets/audi2.png',
'assets/audi.png',
'assets/audi2.png',
'assets/audi3.png',
];
var name;
var auth1 = FirebaseAuth.instance.currentUser;
Data? c;
late final Value;
List<Data> dataList = [];
List<dynamic> d = [];
List<dynamic> favList = [];
#override
void initState() {
print("object");
super.initState();
print(auth1);
_activateListener();
}
void _activateListener() {
final _database = FirebaseDatabase.instance.ref();
_database.child('user').get().then((snapshot) {
dataList.clear();
favList.clear();
print("hello");
Value = snapshot.value as Map;
final datas = snapshot.children.forEach((element) {
d.add(element.key);
});
for (var k in d) {
//print("");
print(Value[k]['imgUrl']);
print((Value[k]['carName']).runtimeType);
dataList.add(Data(
Value[k]['carName'],
Value[k]['price'],
Value[k]["imgUrl"],
k,
));
if (auth1 != null) {
print(k);
print("auth1");
print(auth1);
DatabaseReference reference = FirebaseDatabase.instance
.ref()
.child("user")
.child(k)
.child("fav")
.child(auth1!.uid)
.child("state");
reference.get().then((s) {
print(s.value);
print("upp is vla");
if (s.value != null) {
if (s.value == true) {
// print(s.value);
// print("true");
favList.add(true);
print(favList);
} else {
//print(s.value);
print("false1");
favList.add(false);
//print(favList);
}
} else {
print("inelse");
favList.add(false);
print(favList);
}
});
}
}
Timer(Duration(seconds: 1), () {
setState(() {
inspect(favList);
});
});
});
}
#override
Widget build(BuildContext context) {
return SafeArea(
child: Scaffold(
body: Container(
color: Colors.white,
child: Stack(
children: [
Image.asset(
"assets/top.png",
fit: BoxFit.cover,
),
Column(
children: [
SizedBox(
height: 30,
),
search(context),
SizedBox(
height: 80,
),
Expanded(
child: GridView.count(
crossAxisCount: 2,
crossAxisSpacing: 10,
mainAxisSpacing: 40,
children: List.generate(
dataList.length, (index) => GridDesign(index)).toList(),
)),
],
)
],
),
),
),
);
}
SizedBox GridDesign(int index) {
return SizedBox(
child: Column(
children: [
Stack(
clipBehavior: Clip.none,
children: [
Container(
height: 15.h,
width: 45.w,
margin: EdgeInsets.only(left: 12, top: 12, right: 16),
decoration: BoxDecoration(
// border: Border.all(color: Colors.grey,style: BorderStyle.solid,width: 2),
borderRadius: BorderRadius.circular(5),
image: DecorationImage(
image: NetworkImage(dataList[index].url.toString()),
fit: BoxFit.cover)),
),
Positioned(
bottom: -3,
right: 5,
child: Container(
height: 32,
width: 32,
child: Neumorphic(
padding: EdgeInsets.zero,
style: NeumorphicStyle(
//shape: NeumorphicShape.concave,
boxShape: NeumorphicBoxShape.roundRect(
BorderRadius.circular(50)),
color: Colors.white),
child: favList[index]
? IconButton(
padding: EdgeInsets.zero,
onPressed: () {
if (auth1 != null) {
print(auth1);
print("it's not null");
DatabaseReference favRef = FirebaseDatabase
.instance
.ref()
.child("user")
.child(
dataList[index].uploadId.toString())
.child("fav")
.child(auth1!.uid)
.child("state");
favRef.set(false);
setState(() {
favFun();
});
}
print("object");
},
icon: Icon(
Icons.favorite,
color: Colors.red,
),
)
: IconButton(
padding: EdgeInsets.zero,
onPressed: () {
if (auth1 != null) {
print("it's not null1");
print(auth1);
DatabaseReference favRef = FirebaseDatabase
.instance
.ref()
.child("user")
.child(
dataList[index].uploadId.toString())
.child("fav")
.child(auth1!.uid)
.child("state");
favRef.set(true);
setState(() {
favFun();
});
}
print("object");
},
icon: Icon(
Icons.favorite,
))),
),
),
],
),
SizedBox(
height: 4,
),
Expanded(child: Text(dataList[index].CarName.toString())),
SizedBox(height: 2),
Expanded(
child: Text("R" + dataList[index].price.toString()),
),
SizedBox(height: 3),
Expanded(
child: ElevatedButton(
onPressed: () =>
Get.to(DetailPage(dataList[index].Url, dataList[index].Price)),
child: Text("Details"),
style: ElevatedButton.styleFrom(primary: myColor),
))
],
),
);
}
void favFun() {
final _database = FirebaseDatabase.instance.ref();
_database.child('user').get().then((snapshot) {
favList.clear();
for (var k in d) {
//print("");
if (auth1 != null) {
print(k);
print("auth1");
print(auth1);
DatabaseReference reference = FirebaseDatabase.instance
.ref()
.child("user")
.child(k)
.child("fav")
.child(auth1!.uid)
.child("state");
reference.once().then((DatabaseEvent s) {
print(s.snapshot.value);
print("upp is vla");
if (s.snapshot.value != null) {
if (s.snapshot.value == true) {
// print(s.value);
// print("true");
favList.add(true);
print(favList);
} else {
//print(s.value);
print("false1");
favList.add(false);
//print(favList);
}
} else {
print("inelse");
favList.add(false);
print(favList);
}
});
}
}
Timer(Duration(seconds: 1), () {
setState(() {
//inspect(favList);
});
});
});
}
}
Have a look at the picture to get a better view