push Main page to second page - flutter

Question

I have five items on the main screen, and what I want to do when one is pressed it goes to the corresponding page. Not sure exactly how to use the InkWell function to be able to push the tap from the first main page to the second page. .
Not sure if I am on the right track with the code below or need to go into another direction.
Main.dart
import 'package:flutter/material.dart';
import './food_catefgories.dart';
import './main_categories_screen.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Made in Canada Stuff',
theme: ThemeData(
primarySwatch: Colors.blue,
canvasColor: Color.fromRGBO(225, 254, 229, 1),
textTheme: ThemeData.light().textTheme.copyWith(
body1: TextStyle(
color: Color.fromRGBO(20, 51, 51, 1),
),
body2: TextStyle(
color: Color.fromRGBO(20, 51, 51, 1),
),
title: TextStyle(
fontSize: 20,
fontFamily: 'RobotoCondensed',
fontWeight: FontWeight.bold,
)),
),
home: MainCategoriesScreen(),
initialRoute: '/spalsh',
routes: {
'/splash': (context) => MainCategoriesScreen(),
'/one': (context) => OneCategoriesScreen(),
'/two': (context) => TwoCategoriesScreen(),
'/three': (context) => ThreeCategoriesScreen(),
'/four': (context) => FourCategoriesScreen(),
'/five': (context) => FiveCategoriesScreen(),
},
);
}
}
main_categories_screen.dart
import 'package:flutter/material.dart';
import './category_item.dart';
class Category {
final String id;
final String title;
final Color color;
const Category({
this.id,
this.title,
this.color = Colors.orange,
});
}
const MAINCAT_CATEGORIES = const [
Category(
id: 'c1',
title: "ONE",
color: Colors.purple,
),
Category(
id: 'c2',
title: "TWO",
color: Colors.red,
),
Category(
id: 'c3',
title: "THREE",
color: Colors.blue,
),
];
class MainCategoriesScreen extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Made title'),
),
body: GridView(
padding: const EdgeInsets.all(25),
children: MAINCAT_CATEGORIES
.map((catData) => CategoryItem(
catData.title,
catData.color,
),
)
.toList(),
gridDelegate: SliverGridDelegateWithMaxCrossAxisExtent(
maxCrossAxisExtent: 200,
childAspectRatio: 3 / 2,
crossAxisSpacing: 20,
mainAxisSpacing: 20,
),
),
);
}
}
category_item.dart
import 'package:flutter/material.dart';
import './main_categories_screen.dart';
class CategoryItem extends StatelessWidget {
final String title;
final Color color;
CategoryItem(this.title, this.color);
void selectCategory(BuildContext ctx) {
Navigator.of(ctx).push(
MaterialPageRoute(
builder: (_) {
return MainCategoriesScreen();
},),);
}
#override
Widget build(BuildContext context) {
return InkWell(
onTap: () => selectCategory(context),
splashColor: Theme.of(context).primaryColor,
borderRadius: BorderRadius.circular(15),
child: Container(
padding: const EdgeInsets.all(15),
child: Text(title,
style: Theme.of(context).textTheme.title,
),
decoration: BoxDecoration(gradient: LinearGradient(
colors: [
color.withOpacity(0.7),
color,
],
begin: Alignment.topLeft,
end: Alignment.bottomRight,
),
borderRadius: BorderRadius.circular(15),
),
),
);
}
}

Answer 1

You can navigate from one screen to another and pass the data using Navigate class
For Example i'm using in my app.
Navigator.push(context,MaterialPageRoute(builder:
(context) => Home(userRole: role)),
ModalRoute.withName('/home'));

Answer 2

Navigator.push(context,MaterialPageRoute(builder:
(context) => Home(userRole: role))),
or
Navigator.pushNamed(context, '/first');
Make sure before using second line you have to declared all page in your MaterialApp like
initialRoute: '/spalsh',
routes: {
'/': (context) => LoginScreen(),
'/spalsh':(context)=>SplashScreen(),
'/first': (context) => FirstScreen(),
'/leave': (context) => ApplyLeave(),
'/bill': (context) => ApplyBill(),
'/contact': (context) => ContactUs(),
'/four': (context) => ScreenFour(),
'/five': (context) => ScreenFive(),
'/six': (context) => ScreenSix(),
'/seven': (context) => ScreenSeven(),
},

Answer 3

//Navigate to other page with class name and parameters
Navigator.push(
context, MaterialPageRoute(builder: (context) => FoodCategoriesScreen(title:"Items")));
//class name is FoodCategoriesScreen and the parameter is title to which we are assigning a value "Items".
//Navigator through routes that you have specified in your code (without parameters)
Navigator.pushNamed(context, '/food');