Theme changing implicitly in Flutter - flutter

Question

i'm trying to write a flutter application wHich takes two themes dark and brightness switch case device settings like this:
return MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Selectable GridView',
theme: ThemeData(
brightness: Brightness.dark,
),
home:HomePage(),
);
with the Brightness.light i have no problem but with the Brightness.dark it works correctly to some alert and when the app have an alert the alert color didn't change to dark and after the alert all the app change theme and color primaryColor:Colors.blue without any code written from me
import 'package:backback/Resultat/testclass.dart' as globals;
import 'package:flutter/cupertino.dart';
import 'package:hardware_buttons/hardware_buttons.dart' as HardwareButtons;
import 'dart:async';
import 'package:flutter/material.dart';
import 'ecouteurT.dart';
import 'flashT.dart';
class Boutontest extends StatefulWidget {
#override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<Boutontest> {
String _latestHardwareButtonEvent;
StreamSubscription<HardwareButtons.VolumeButtonEvent>
_volumeButtonSubscription;
StreamSubscription<HardwareButtons.HomeButtonEvent> _homeButtonSubscription;
StreamSubscription<HardwareButtons.LockButtonEvent> _lockButtonSubscription;
int a, b, c, d;
#override
void initState() {
super.initState();
new Future.delayed(Duration.zero, () {
showDialog(
barrierDismissible: false,
context: context,
builder: (BuildContext context) => Dialog(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(20.0)), //this right here
child: Container(
height: 110,
child: Padding(
padding: EdgeInsets.all(0),
child: ListView(
children:
ListTile.divideTiles(context: context, tiles: [
ListTile(
title: Text(
'essayez de appyeez sur les boutons l\'un apres l\'autre et verifiez que tout bouton appyez ets montrez',
textAlign: TextAlign.center,
style: TextStyle(
fontWeight: FontWeight.bold,
),
),
onTap: null,
),
ListTile(
title: Text(
'OK',
textAlign: TextAlign.center,
style: TextStyle(color: Colors.deepOrange),
),
onTap: () {
Navigator.of(context).pop(false);
},
)
]).toList())))));
});
_volumeButtonSubscription =
HardwareButtons.volumeButtonEvents.listen((event) {
setState(() {
_latestHardwareButtonEvent = event.toString();
});
if (_latestHardwareButtonEvent == 'VolumeButtonEvent.VOLUME_DOWN') {
b = 0;
}
if (_latestHardwareButtonEvent == 'VolumeButtonEvent.VOLUME_UP') {
c = 0;
}
});
_homeButtonSubscription = HardwareButtons.homeButtonEvents.listen((event) {
setState(() {
a = 0;
_latestHardwareButtonEvent = 'HOME_BUTTON';
});
});
_lockButtonSubscription = HardwareButtons.lockButtonEvents.listen((event) {
setState(() {
d = 0;
_latestHardwareButtonEvent = 'LOCK_BUTTON';
});
});
}
#override
void dispose() {
super.dispose();
_volumeButtonSubscription?.cancel();
_homeButtonSubscription?.cancel();
_lockButtonSubscription?.cancel();
}
#override
Widget build(BuildContext context) {
double height = MediaQuery.of(context).size.height;
return Scaffold(
appBar: AppBar(
title: const Text(
'Hi',
style: TextStyle(color: Colors.black),
),
),
body: Container(
child: Column(children: <Widget>[
Container(
height: height * 0.01,
),
Card(
child: ListTile(
leading: CircularProgressIndicator(
valueColor:
new AlwaysStoppedAnimation<Color>(Colors.deepOrange)),
title: Text(
'Detection des Boutons...',
style: TextStyle(fontWeight: FontWeight.bold),
),
subtitle: Text('Element 1/1'),
trailing: InkWell(
onTap: () {
globals.Data.etatbouton('ignore');
Navigator.push(
context,
MaterialPageRoute(builder: (context) => Flash()),
);
},
child: Text(
'Ignore>',
style: TextStyle(color: Colors.deepOrange),
),
),
)),
Container(
height: height * 0.02,
),
if (_latestHardwareButtonEvent == 'HOME_BUTTON' || a == 0)
Card(
child: ListTile(
title: Text('Le Bouton Home'),
trailing: Icon(
Icons.check,
color: Colors.deepOrange,
),
),
),
if (_latestHardwareButtonEvent == 'LOCK_BUTTON' || d == 0)
Card(
child: ListTile(
title: Text('Le Bouton Home'),
trailing: Icon(
Icons.check,
color: Colors.deepOrange,
),
),
),
if (_latestHardwareButtonEvent == 'VolumeButtonEvent.VOLUME_DOWN' ||
b == 0)
Card(
child: ListTile(
title: Text('Le Volume Down'),
trailing: Icon(
Icons.check,
color: Colors.deepOrange,
),
),
),
if (_latestHardwareButtonEvent == 'VolumeButtonEvent.VOLUME_UP' ||
c == 0)
Card(
child: ListTile(
title: Text('Le Volume Up'),
trailing: Icon(
Icons.check,
color: Colors.deepOrange,
),
),
),
Container(
margin: const EdgeInsets.all(15.0),
padding: const EdgeInsets.all(3.0),
decoration: BoxDecoration(
border: Border.all(
width: 3.0,
color: Colors.deepOrange,
),
borderRadius: BorderRadius.all(Radius.circular(
30.0) // <--- border radius here
),
),
child: FlatButton(
child: Text(
'Passer au test suivant',
style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
),
onPressed: () {
Future.delayed(Duration.zero, () {
showDialog(
barrierDismissible: false,
context: context,
builder: (BuildContext context) =>
Dialog(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(
20.0)), //this right here
child: Container(
height: 180,
child: Padding(
padding: EdgeInsets.all(0),
child: ListView(
children: ListTile.divideTiles(
context: context,
tiles: [
ListTile(
title: Text(
'Tout les boutons appyez sont montrez',
textAlign: TextAlign.center,
style: TextStyle(
fontWeight: FontWeight.bold,
),
),
onTap: null,
),
ListTile(
title: Text(
'Oui',
textAlign: TextAlign.center,
style: TextStyle(
color: Colors.deepOrange),
),
onTap: () {
globals.Data.etatbouton('1');
Navigator.push(
context,
MaterialPageRoute(
builder: (context) =>
Flash()),
);
},
),
ListTile(
title: Text(
'Non',
textAlign: TextAlign.center,
style: TextStyle(
color: Colors.deepOrange),
),
onTap: () {
globals.Data.etatbouton('0');
Navigator.push(
context,
MaterialPageRoute(
builder: (context) =>
Flash()),
);
},
)
]).toList())))));
});
},
))
]),
),
);
}
}
That's the code of one of the alert I need some help.
import 'package:flutter/material.dart';
import 'package:lamp/lamp.dart';
import 'dart:async';
import 'package:backback/Resultat/testclass.dart' as globals;
import 'batterieT.dart';
class Flash extends StatefulWidget {
#override
_MyAppState createState() => new _MyAppState();
}
class _MyAppState extends State<Flash> {
bool _hasFlash = false;
bool _isOn = false;
double _intensity = 1.0;
#override
initState() {
super.initState();
initPlatformState();
}
initPlatformState() async {
bool hasFlash = await Lamp.hasLamp;
print("Device has flash ? $hasFlash");
setState(() { _hasFlash = hasFlash; });
}
#override
Widget build(BuildContext context) {
double width = MediaQuery.of(context).size.width;
double height = MediaQuery.of(context).size.height;
return Scaffold(
appBar: AppBar(
title: Text('hi'),
),
body: Container(
//
child: Column(
children: <Widget>[
Container(
height: height*0.01,
),
Card(child:ListTile(
leading: CircularProgressIndicator(valueColor:
new AlwaysStoppedAnimation<Color>(Colors.deepOrange)),
title: Text('Detection Connexion et deconnexion des ecouteurs...',style:TextStyle(fontWeight: FontWeight.bold,color: Colors.deepOrange),),
subtitle: Text('Element 1/1'),
trailing: InkWell(
onTap: (){
globals.Data.etatkit('ignore');
Navigator.push(
context,
MaterialPageRoute(builder: (context) => Batterie()),
);
},
child: Text('Ignore>',style: TextStyle(color: Colors.deepOrange),),
),
)),
Container(
height: height*0.02,
),
Container(
margin: const EdgeInsets.only(left: 20.0, right: 20.0),
child:Text(
'Veuillez branchez les ecouteurs plusieurs fois tout en verifiant si le texte afffiche correspond a l\'etat reel',
textAlign: TextAlign.center,)),
if(_isOn==false)
new InkWell(child: Image.asset('assets/flash.jpg'),
onTap:(){_turnFlash();} ,) ,
if(_isOn==true)
new InkWell(child: Image.asset('assets/flashO.jpg'),
onTap:(){_turnFlash();} ,),
Divider(),
Container(
margin: const EdgeInsets.only(left: 20.0, right: 20.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
InkWell (child:Text('Ne correspond pas',style: TextStyle(color: Colors.deepOrange),)
, onTap: (){
globals.Data.etatkit('0');
Navigator.push(
context,
MaterialPageRoute(builder: (context) => Batterie()),
);
},),
InkWell(child: Text('Correspond',style: TextStyle(color: Colors.deepOrange),),
onTap: (){
globals.Data.etatkit('1');
Navigator.push(
context,
MaterialPageRoute(builder: (context) => Batterie()),
);
},)
],
),
)
],
),
),
);
}
Future _turnFlash() async {
_isOn ? Lamp.turnOff() : Lamp.turnOn(intensity: _intensity);
var f = await Lamp.hasLamp;
setState((){
_hasFlash = f;
_isOn = !_isOn;
});
}
_intensityChanged(double intensity) {
Lamp.turnOn(intensity : intensity);
setState((){
_intensity = intensity;
});
}
}
and in this class when the navigator pass to this class I lost dark theme.