how can I use showChoiceDialog() in my main.dart file - flutter

Question

here is code of imagepicker in flutter .
how can I use showChoiceDialog(), opengallery() ,openCamera() in my other files . what class objects and variable should i have to make in order to use this functions in other file .how can I use showChoiceDialog(), opengallery() ,openCamera() in my other files . what class objects and variable should i have to make in order to use this functions in other file .
how can i set new image to Image Widgets .how can update the state.
imagepicker.dart
import 'dart:ffi';
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
class CameraWidget extends StatefulWidget {
#override
State createState() {
// TODO: implement createState
return CameraWidgetState();
}
}
class CameraWidgetState extends State {
PickedFile? imageFile = null;
Future<void> showChoiceDialog(BuildContext context) {
return showDialog(
context: context,
builder: (BuildContext context) {
return AlertDialog(
title: Text(
"Choose option",
style: TextStyle(color: Colors.blue),
),
content: SingleChildScrollView(
child: ListBody(
children: [
Divider(
height: 1,
color: Colors.blue,
),
ListTile(
onTap: () {
_openGallery(context);
},
title: Text("Gallery"),
leading: Icon(
Icons.account_box,
color: Colors.blue,
),
),
Divider(
height: 1,
color: Colors.blue,
),
ListTile(
onTap: () {
_openCamera(context);
},
title: Text("Camera"),
leading: Icon(
Icons.camera,
color: Colors.blue,
),
),
],
),
),
);
},
);
}
#override
Widget build(BuildContext context) {
// TODO: implement build
return Scaffold(
appBar: AppBar(
title: Text("Pick Image Camera"),
backgroundColor: Colors.green,
),
body: Center(
child: Container(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: [
Card(
child: (imageFile == null)
? Text("Choose Image")
: Image.file(File(imageFile!.path)),
),
Image.asset('images/img1.jpg'),
MaterialButton(
textColor: Colors.white,
color: Colors.pink,
onPressed: () {
showChoiceDialog(context);
},
child: Text("Select Image"),
)
],
),
),
),
);
}
void _openGallery(BuildContext context) async {
final pickedFile = await ImagePicker().getImage(
source: ImageSource.gallery,
);
setState(() {
imageFile = pickedFile!;
});
Navigator.pop(context);
}
void _openCamera(BuildContext context) async {
final pickedFile = await ImagePicker().getImage(
source: ImageSource.camera,
);
setState(() {
imageFile = pickedFile!;
});
Navigator.pop(context);
}
}

Answer 1

You cannot access their properties as they are marked as private. To mark a function/method as private, you put an underscore before its name. For example, checkUpdates() is a public method, and _checkUpdates() is a public method.
I would recommend putting these in another file if you plan on reusing them.
A very basic method of doing this is to create a new file, image_service.dart
Make a new class
class ImageService {
static void openGallery(BuildContext context) async {
final pickedFile = await ImagePicker().getImage(
source: ImageSource.gallery,
);
setState(() {
imageFile = pickedFile!;
});
Navigator.pop(context);
}
static void openCamera(BuildContext context) async {
final pickedFile = await ImagePicker().getImage(
source: ImageSource.camera,
);
setState(() {
imageFile = pickedFile!;
});
Navigator.pop(context);
}
}
And then you can use it as follows. ImageService.openGallery(context);