flutter tutorial bottom navigation with state management

sure! in this tutorial, we'll create a simple flutter application with a bottom navigation bar and implement state management using the `provider` package. this will allow us to manage the currently selected tab in a clean and efficient way.

prerequisites

- basic knowledge of dart and flutter
- flutter sdk installed on your machine
- an ide (like visual studio code or android studio)

step 1: create a new flutter project

start by creating a new flutter project. you can do this using the terminal or command prompt:

```bash
flutter create bottom_navigation_example
cd bottom_navigation_example
```

step 2: add dependencies

```yaml
dependencies:
flutter:
sdk: flutter
```

then run:

```bash
flutter pub get
```

step 3: create the state management class

```dart

class navigationprovider with changenotifier {
int _selectedindex = 0;

int get selectedindex = _selectedindex;

void setindex(int index) {
_selectedindex = index;
notifylisteners();
}
}
```

step 4: create the main application

```dart

void main() {
runapp(
changenotifierprovider(
create: (context) = navigationprovider(),
child: myapp(),
),
);
}

class myapp extends statelesswidget {
@override
widget build(buildcontext context) {
return materialapp(
title: 'flutter bottom navigation',
home: homescreen(),
);
}
}

class homescreen extends statelesswidget {
@override
widget buil ...

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