Field '_image' has not been initialized in flutter - flutter

Question

I wastrying image upload in flutter using imagepicker. While I was choose image the image cant display in one container. I was no error in error console. But the error was"Field '_image' has not been initialized. I am confused in flutter. Please he me guys
class Home extends StatefulWidget {
const Home({Key? key}) : super(key: key);
#override
_HomeState createState() => _HomeState();
}
class _HomeState extends State<Home> {
File? _image;
final picker = ImagePicker();
TextEditingController namecontroller = TextEditingController();
Future chooseimage() async {
var pickedImage = await picker.pickImage(source: ImageSource.gallery);
setState(() {
//_image = File(pickedImage!.path);
_image = File(pickedImage!.path);
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Upload Image"),
),
body: Container(
child: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: [
ElevatedButton(
onPressed: chooseimage,
child: Text("Select Image"),
style: ElevatedButton.styleFrom(primary: Colors.green),
),
TextField(
controller: namecontroller,
decoration: InputDecoration(label: Text("Name")),
),
SizedBox(
height: 30.0,
),
ElevatedButton(
onPressed: () {},
child: Text("Upload"),
style: ElevatedButton.styleFrom(primary: Colors.blue),
),
Container(
child: _image == null
? Text('No Image Select')
: Image.file(_image!),
),
],
),
),
),
);
}
}

Answer 1

///You can take a reference through this code hope this will work for you. Thanks
import 'dart:io';
import 'package:cached_network_image/cached_network_image.dart';
import 'package:flutter/material.dart';
import 'package:flutter_spinkit/flutter_spinkit.dart';
import 'package:image_cropper/image_cropper.dart';
import 'package:image_picker/image_picker.dart';
import 'package:material_design_icons_flutter/material_design_icons_flutter.dart';
import 'package:provider/provider.dart';
import 'package:traveling/Provider/EmployeeProvider/EmployeeProfileProvider.dart';
import 'package:traveling/helpers/AppColors.dart';
///To get the crop value creating a class
enum AppState {
free,
picked,
cropped,
}
class EmployeeProfile extends StatefulWidget {
final bool leadingIcon;
final number;
final cardName;
EmployeeProfile(
{Key? key, required this.leadingIcon, this.number, this.cardName})
: super(key: key);
#override
_EmployeeProfileState createState() => _EmployeeProfileState();
}
class _EmployeeProfileState extends State<EmployeeProfile>
with TickerProviderStateMixin {
EmployeeProfileProvider? _provider;
///controller widget used in Spinkit plugin to show loading process
animationControllerField(){
AnimationController animationController =AnimationController(
vsync: this, duration: const Duration(milliseconds: 900));
}
bool? visible;
double? _width;
File? _image;
var url;
late AppState state;
final picker = ImagePicker();
///pop-up to choose camera gallery while uploading image
Future<void> _showChoiceDialog(BuildContext context) {
return showDialog(
context: context,
builder: (BuildContext context) {
return AlertDialog(
title: Text(
"Choose option",
style: TextStyle(color: AppColors.hotelListDarkBlue),
),
content: SingleChildScrollView(
child: ListBody(
children: [
Divider(
height: 1,
color: AppColors.baseLightBlueColor,
),
ListTile(
onTap: () {
Navigator.pop(context, _pickImage(ImageSource.gallery,context));
},
title: Text(
"Gallery",
style: TextStyle(color: AppColors.hotelListDarkBlue),
),
leading: Icon(
Icons.account_box,
color: AppColors.baseLightBlueColor,
),
),
Divider(
height: 1,
color: AppColors.baseLightBlueColor,
),
ListTile(
onTap: () {
Navigator.pop(context, _pickImage(ImageSource.camera,context));
},
title: Text(
"Camera",
style: TextStyle(color: AppColors.hotelListDarkBlue,),
),
leading: Icon(
Icons.camera,
color: AppColors.baseLightBlueColor,
),
),
],
),
),
);
});
}
///crop image selecting by the user
Future<Null> _cropImage() async {
File? croppedFile = await ImageCropper.cropImage(
sourcePath: _image!.path,
aspectRatioPresets: Platform.isAndroid
? [
CropAspectRatioPreset.square,
CropAspectRatioPreset.ratio3x2,
CropAspectRatioPreset.original,
CropAspectRatioPreset.ratio4x3,
CropAspectRatioPreset.ratio16x9
]
: [
CropAspectRatioPreset.original,
CropAspectRatioPreset.square,
CropAspectRatioPreset.ratio3x2,
CropAspectRatioPreset.ratio4x3,
CropAspectRatioPreset.ratio5x3,
CropAspectRatioPreset.ratio5x4,
CropAspectRatioPreset.ratio7x5,
CropAspectRatioPreset.ratio16x9
],
androidUiSettings: AndroidUiSettings(
toolbarTitle: 'Cropper',
toolbarColor: AppColors.baseLightBlueColor,
toolbarWidgetColor: Colors.white,
initAspectRatio: CropAspectRatioPreset.original,
lockAspectRatio: false),
iosUiSettings: IOSUiSettings(
title: 'Cropper',
));
if (croppedFile != null) {
_image = croppedFile;
setState(() {
state = AppState.cropped;
});
///to get upload image
url = await _provider!.setUserUpdatedImageInfo(_image!, );
setState(() {
///to set the image
_provider!.currentLoggedInUser!.image = url;
});
}
}
///icon change while user edit image
Widget _buildButtonIcon() {
if (state == AppState.free)
return Icon(
MdiIcons.squareEditOutline,
color: AppColors.popUpBlueColor,
size: 20,
);
else if (state == AppState.picked)
return Icon(Icons.crop,color: AppColors.popUpBlueColor,
size: 20,);
else if (state == AppState.cropped)
return Icon(
MdiIcons.squareEditOutline,
color: AppColors.popUpBlueColor,
size: 20,
);
else
return Container();
}
#override
void initState() {
// TODO: implement initState
super.initState();
print("initState called");
state = AppState.free;
_provider = EmployeeProfileProvider();
_provider!.getUserInfo();
}
///this widget is the main widget and it is used for building a UI in the app.
#override
Widget build(BuildContext context) {
_width = MediaQuery.of(context).size.width;
return ChangeNotifierProvider<EmployeeProfileProvider?>(
create: (context) => _provider!,
child: Consumer<EmployeeProfileProvider?>(
builder: (context, provider, child) {
return provider!.currentLoggedInUser==null?
Material(
color: AppColors.white,
child: Center(
child:
SpinKitCubeGrid(
color: AppColors.baseLightBlueColor,
size: 50.0,
controller:animationControllerField()
),
),
):Container(
width: _width!,
color: AppColors.white,
child: Stack(
children: [
Column(
children: [
Material(
color: AppColors.baseLightBlueColor,
elevation: 15,
shape: RoundedRectangleBorder(
borderRadius:
BorderRadius.only(bottomRight: Radius.circular(30)),
),
child: Container(
height: 180,
decoration: BoxDecoration(
color: AppColors.baseLightBlueColor,
// AppColors.blue,
borderRadius: BorderRadius.only(
bottomRight: Radius.circular(30)),
),
),
),
],
),
Positioned(
top: 80,
child:
Stack(
children: [
Container(
height: 150,
width: _width,
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
CachedNetworkImage(
filterQuality: FilterQuality.high,
maxHeightDiskCache: 100,
fit: BoxFit.cover,
imageUrl: provider.currentLoggedInUser!.image.toString(),
imageBuilder: (context, imageProvider) => Container(
height: 120,
width: 120,
decoration: BoxDecoration(
shape: BoxShape.circle,
image: DecorationImage(
image: imageProvider, fit: BoxFit.cover),
border: Border.all(
color: AppColors.white, width: 2.0),
),
),
placeholder: (context, url) =>
const CircularProgressIndicator(),
errorWidget: (context, url, error) => Container(
height: 120,
width: 120,
decoration: BoxDecoration(
color: Colors.white,
shape: BoxShape.circle,
image:DecorationImage(
fit: BoxFit.cover,
image: AssetImage('assets/managerPicture.jpeg')),
border: Border.all(
color: AppColors.white, width: 2.0),
),
),
fadeOutDuration: const Duration(seconds: 1),
fadeInDuration: const Duration(seconds: 3),
),
],
),
),
Positioned(
top: 60,
right: 0,
left: 100,
bottom: 0,
child: GestureDetector(
onTap: () {
if (state == AppState.free)
_showChoiceDialog(context);
else if (state == AppState.picked)
_cropImage();
else if (state == AppState.cropped) _showChoiceDialog(context);
},
child: Container(
height: 10,
width: _width,
child: Row(
mainAxisAlignment:
MainAxisAlignment.center,
children: [
Container(
height: 35,
width: 35,
decoration: BoxDecoration(
color:
AppColors.profiePicBackground,
borderRadius:
BorderRadius.circular(60),
),
child: ClipRRect(
borderRadius:
BorderRadius.circular(60.0),
child: _buildButtonIcon(),
/*Icon(
MdiIcons.squareEditOutline,
color: AppColors.popUpBlueColor,
size: 20,
),*/
),
),
],
),
),
),
)
],
)
),
Positioned(
top: 40,
child: Container(
width: MediaQuery.of(context).size.width,
padding: EdgeInsets.only(left: 8, right: 8),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
widget.leadingIcon == true
? Align(
alignment: Alignment.topLeft,
child: GestureDetector(
onTap: () {
Navigator.pop(context);
},
child: Icon(
MdiIcons.arrowLeft,
color: Colors.white,
)),
)
: Container(),
],
),
)),
],
),
);
}));
}
///ImageSource: Camera and Gallery.
Future<Null> _pickImage(ImageSource source,context) async {
final pickedImage = await ImagePicker().pickImage(source: source);
_image = pickedImage != null ? File(pickedImage.path) : null;
if (_image != null) {
setState(() {
state = AppState.picked;
});
}
}
}
class EmployeeProfileProvider extends ChangeNotifier {
late bool _isInfoEditable;
FirebaseFirestore? fireStoreInstance;
EmployeeProfileModel? _userData;
// EmployeeMyExpenseReport ? _employeeMyExpenseReport;
///to update the employee profile image
Future<String?> setUserUpdatedImageInfo(File _image, ) async {
var data= await EmployeeServices.getInstance().uploadImageToFirebase(_image, );
notifyListeners();
return data;
}
///to update Personal details of employee
EmployeeProfileModel? get getUploadedImage => _userData;
#override
void dispose() {
//print("Provider disposed called");
super.dispose();
}
//upload employee image on firebase
String ?url;
Future <String?>uploadImageToFirebase(File _image) async {
User? currentUser = FirebaseAuth.instance.currentUser;
String fileName = basename(_image.path);
firebase_storage.Reference ref = firebase_storage.FirebaseStorage.instance
.ref().child('uploads')
.child('/$fileName');
final metadata = firebase_storage.SettableMetadata(
contentType: 'image/jpeg',
customMetadata: {'picked-file-path': fileName});
firebase_storage.UploadTask uploadTask;
uploadTask = ref.putFile(io.File(_image.path), metadata);
//String ?url;
await uploadTask.whenComplete(() async {
url = await uploadTask.snapshot.ref.getDownloadURL();
});
Future.value(uploadTask)
.then((value) => {
print("Upload file path ${value.ref.fullPath}"),
FirebaseFirestore.instance.collection(FirestoreCollections.employees).doc(currentUser!.uid).update({'image': '$url'}),
})
.onError((error, stackTrace) =>
{
print("Upload file path error ${error.toString()} ")}
);
return url;
}
}