Flutter sending integer values from one page to another - flutter

Question

I am working on a location based app and in the settings page I have an option the allows users to change their location radius using the slider package. Such that when the slider is moved, more or less content gets shown in the home screen.
I tried sending the data using setstate but it seems not to be working for integer values
Am encountering the following problems
1.When the slider is moved, the changes dont reflect on the home page, I know this since ive inserted a text widget in the home screen to display the slider value.
2.On the settings page where the slider is, whenever I slide it, it updates but when I navigate to another screen then back to the settings screen, the slider resets to the minimum value.
How can I solve the above problems?
Here is my slider code on the settings page
Slider(
value: radius,
onChanged: (newRadius) async{
setState(() {
tasks = newRadius.toDouble();
String step2 = radius.toStringAsFixed(2);
twodecimalradius = double.parse(step2); //converting the slider value to 2 decimal places
});
print(twodecimalradius);
await Home(twodecimalradius:twodecimalradius); //passing the slider value to homepage
await Home.staticGlobalKey.currentState.getposts();//a function in the homepage that gets called whenever the slider value is changed
},
min: 10.0,
max: 500.0,
//activeColor: Colors.red[400],
)
And in my homepage this is the code that is supposed to display the slider value in a text widget
class Home extends StatefulWidget {
var twodecimalradius;
static final GlobalKey<_HomeState> staticGlobalKey =
new GlobalKey<_HomeState>();
Home({
this.twodecimalradius,
}): super(key: Home.staticGlobalKey);
Widget build(BuildContext context) {
return Scaffold(body:Text(widget.twodecimalradius))
}