File _image;
final picker = ImagePicker();
Future getImage() async {
final pickedFile = await picker.getImage(source: ImageSource.camera);
setState(() {
if (pickedFile != null) {
_image = File(pickedFile.path);
} else {
print('No image selected.');
}
});
}
output :
D/MediaScannerConnection(16161): Scanned
/storage/emulated/0/Android/data/com.xxxx.xxxx/files/Pictures/9d9ed6a1-292c-428a-bf24-38ea1a58742c6940060118053310767.jpg
to null
This problem occurred to me too. I have found that somehow the captured image data is lost due to the MainActivity is killed after the image_picker finishes. To solve this, just add retrieve lost data handler. You can find the example code on the documentation here. (Refer section: Handling MainActivity destruction on Android #)
Related
Following a tutorial for adding and saving images and getting errors for the below code, under ImagePicker, ImageSource and SelectedImage.
Future getImage() async {
var image = await ImagePicker.PickImage(source: ImageSource.camera);
setState(() {
selectedimage = image;
});
}
You need to create an instance first, then you will be able to use pickImage method.
Future getImage() async {
XFile? image = await ImagePicker().pickImage(source: ImageSource.camera);
if (image != null) {
setState(() {
selectedimage = image;
});
}
}
Fine more about image_picker
You have to be careful whenever playing with the setState() functions. This combined with how you pick the image and how you store it in the 'var' in your case could cause further trouble. To generally ease things up for further use I recommend creating a utils class, in which you would have an image picker method, just like this one:
import 'package:image_picker/image_picker.dart';
pickImage(ImageSource source) async {
final ImagePicker _imagePicker = ImagePicker();
XFile? _file = await _imagePicker.pickImage(source: source);
if (_file != null) {
return await _file.readAsBytes();
}
print('No Image Selected');
}
Afterwards, if you would like to call that in any other instance you would need something like this, though this is for a url image(I had it in hand), such as:
void selectImage() async {
Uint8List? im = await pickImage(ImageSource.gallery);
final ByteData imageData = await NetworkAssetBundle(Uri.parse(
"url for template image"))
.load("");
final Uint8List bytes = imageData.buffer.asUint8List();
// if null - use the template image
im ??= bytes;
// update state
setState(() {
_image = im!;
});
}
Hope it helped in a way.
I am creating a widget in which I want to display a gridview of image clicked through mobile camera at runtime. I had used image_picker package from flutter. But it is only working for picking image from gallery and everytime I click image it crashes.
class _ImageInputState extends State<ImageInput>
with AutomaticKeepAliveClientMixin {
// list of images
final List<File> _imageFileList = [];
final ImagePicker _picker = ImagePicker();
Function for picking image from camera using image_picker
final imageFile = await _picker.pickImage(source: imageSource);
if (imageFile == null) return;
File tmpFile = File(imageFile.path);
final appDir = await getApplicationDocumentsDirectory();
final fileName = basename(imageFile.path);
final localFile = await tmpFile.copy('${appDir.path}/$fileName');
// setState(() {
// _imageFileList.add(localFile);
//
// });
_pickImageGall(ImageSource.gallery);
}
function for picking images from the gallery of phone
Future<void> _pickImageGall(ImageSource imageSource) async {
final _pickedImage = await _picker.pickImage(source: imageSource);
if (_pickedImage != null) {
setState(() {
_imageFileList.add(File(_pickedImage.path));
});
}
}
and in the ui there is a gridview to display the images in which the last index is a input widget where there is two IconButton one for camera input and other for gallery input. As I am making this thing for the first time I am confused how to procedure will be . I had try to implement every solution from the stackoverflow but none worked for me. Please give the solution.
My app crashes when calling "_submit" function 2 times in a row.
I can pick the picture from gallery and upload it to Firebase Storage but if I call it again the the whole app crashes.
From this button :
floatingActionButton: FloatingActionButton(
onPressed: () => _submit(),
Submit calls a Provider of type Database :
Future<void> _submit() async {
widget.database = Provider.of<Database>(context, listen: false);
await widget.database
.setPicture("regione/citta/comune/lavoro/IDArtista/profilo.png");
return;
}
That calls a function that uploads a picture taken from "imgGallery()" to the database :
Future<void> setPicture(String pathStorage) async {
try {
final File file = await imgFromGallery();
if (file == null) return;
TaskSnapshot task =
await FirebaseStorage.instance.ref(pathStorage).putFile(file);
String image_url = await task.ref.getDownloadURL();
return;
} catch (e) {
print(e);
return;
}
}
imgGallery :
Future<File> imgFromGallery() async {
try {
final ImagePicker _picker = ImagePicker();
final PickedFile imageFile =
await _picker.getImage(source: ImageSource.gallery, imageQuality: 50);
//If there is no image selected, return.
if (imageFile == null) return null;
//File created.
File tmpFile = File(imageFile.path);
//it gives path to a directory - path_provider package.
final appDir = await getApplicationDocumentsDirectory();
//filename - returns last part after the separator - path package.
final fileName = tmpFile.path.split('/').last;
//copy the file to the specified directory and return File instance.
return tmpFile = await tmpFile.copy('${appDir.path}/$fileName');
} catch (e) {
print(e);
return null;
}
}
EDIT : Solved using a real device instead of emulators.
Which device are you experiencing this in? I'm also having this error but only on iOS emulator. It has to do with the Image_Picker package and the FocusNode. Look at this issue on github
I am trying to get a image using camera in flutter using image picker but i am getting an error
lib/Screen/AllDocuments.dart:15:3: Error: 'File' isn't a type.
File _image;
I have also tried to cast but still it is not working
File _image;
final picker = ImagePicker();
Future getImage() async {
final pickedFile = await picker.getImage(source: ImageSource.camera);
setState(() {
_image = File(pickedFile);
});
}
How to fix this error
You have to call the .path method on the pickedFile.
See this documentation here => Image Picker
Use this :
File _image;
final picker = ImagePicker();
Future getImage() async {
final pickedFile = await picker.getImage(source: ImageSource.camera);
setState(() {
_image = File(pickedFile.path);
});
}
I want to convert image captured with camera to base64 but it seems am converting the image path and not the image itself, please help me.
File file;
final picker = ImagePicker();
void _choose() async {
final pickedFile = await picker.getImage(source: ImageSource.camera);
file = File(pickedFile.path);
if (file != null) {
setState(() {
base64Encode(file.readAsBytesSync());
print(base64Encode(Image.file(file));
});
}
}
Wrong:
print(base64Encode(Image.file(file));
Right:
print(base64Encode(file.readAsBytesSync()));