How to implement checkbox over GridView correctly - flutter

Question

I have checkbox for selecting and deselecting photos.
There is a visible loading screen for each tap.
_mediaList has the photo asset. mediaModel has the necessary methods to add and remove the path of selected and deselected photos respectively.
Widget build(BuildContext context) {
super.build(context);
return GridView.builder(
itemCount: _mediaList.length,
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 3, mainAxisSpacing: 4.0, crossAxisSpacing: 4.0),
itemBuilder: (BuildContext context, int index) {
final saved = mediaModel.getMedia().contains(
_mediaList[index].relativePath + '/' + _mediaList[index].title);
return FutureBuilder(
future: _mediaList[index].thumbDataWithSize(200, 200),
builder: (BuildContext context, snapshot) => snapshot.hasData
? GridTile(
header: saved
? Icon(Icons.check_circle, color: Colors.white,)
: Icon(Icons.check_circle_outline, color: Colors.white,),
child: GestureDetector(
child: Image.memory(
snapshot.data,
fit: BoxFit.cover,
),
onTap: () => setState(() => saved
? mediaModel.removeMedia(
_mediaList[index].relativePath +
'/' +
_mediaList[index].title)
: mediaModel.addMedia(
_mediaList[index].relativePath +
'/' +
_mediaList[index].title))),
)
: Container());
},
);
}
EDIT: After some analysis, I found out using Provider to load images might be the right way.
Can you help me in converting this code to Provider?
Thanks in advance!!!

Answer 1

Screenshot:
Full code:
class FooPage extends State<SoPage> {
static const int _count = 10;
final List<bool> _checks = List.generate(_count, (_) => false);
#override
Widget build(BuildContext context) {
return Scaffold(
body: GridView.builder(
itemCount: _count,
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2),
itemBuilder: (_, i) {
return Stack(
children: [
Container(color: Colors.red[(i * 100) % 900]),
Align(
alignment: Alignment.topCenter,
child: Checkbox(
value: _checks[i],
onChanged: (newValue) => setState(() => _checks[i] = newValue),
),
),
],
);
},
),
);
}
}