i am working with flutter project and uploading a image file to mysql server but on the screen i get this error:

LateInitializationError: Field '_image@785213298' has not been initialized.

and this is the code which i am using:

late File _image;

Future choiceImage() async{

final picker=ImagePicker();

var pickedImage= await picker.getImage(source: ImageSource.gallery);
setState(() {
  _image=File(pickedImage!.path);
});
   }

Future choice2Image() async{

final picker=ImagePicker();

var pickedImage= await picker.getImage(source: ImageSource.camera);
setState(() {
  _image=File(pickedImage!.path);
});
}

Future uploadImage() async{
final uri=Uri.parse("https://www.example.com/driverapp-apis");
var request =http.MultipartRequest('POST',uri);
request.fields['id']=widget.id.toString();
request.fields['licence']=licenseController.text;
request.fields['expiry']=expiryController.text;
request.fields['action']="updateDocs";
var pic =await http.MultipartFile.fromPath("image", _image.path);
request.files.add(pic);
var response=await request.send();

if (response.statusCode==200){
  print("image uploaded");
  Navigator.push(
    context,
    MaterialPageRoute(
      builder: (context) => aadharCardScreen(widget.id),
    ),
  );
}
else{
  print("image not uploaded");
}
}

and also selcting file with buttons:

onPressed: () {
                  choice2Image();
                },

and

 onPressed: () {
                  choiceImage();
                },`

and also showing the selected image in container:

Container(
            child: Image.file(
              _image,
              fit: BoxFit.cover,
            ),
          ),

i know that is late initialization which states that variable i never initialized but it gets its value after choosing photo or taking photos, what i am doing wrong?

thanks in advance.

CodePudding user response：

Instead of

late File _image;

set

File? _image;

Container(
   child: _image != null? Image.file(
        _image,
              fit: BoxFit.cover,
            ) : const SizedBox(),
         ),

and uploadImage() if _image != null

CodePudding user response：

rather then using late you can use null(?) operator to handle that image case because late function required to initialize value so you can use (?) in file selection.