How can I upload mutiple-photo in flutter app via ImgePicker - flutter

Question

I want to add the function which can upload multiple Photo image via ImagePicker
In this code, I can just upload single photo, not mutiple.
This app operating by flutter, dart and firebase server.
[Code]
void dispose() {
textEditingController.dispose();
super.dispose();
}
File _image;
Future _getImage() async {
var image = await ImagePicker.pickImage(
source: ImageSource.gallery,
maxWidth: 1000,
maxHeight: 1000,
);
setState(() {
_image = image;
});
}
Future _uploadFile(BuildContext context) async {
if (_image != null) {
final firebaseStorageRef = FirebaseStorage.instance
.ref()
.child('post')
.child('${DateTime.now().millisecondsSinceEpoch}.png');
final task = firebaseStorageRef.putFile(
_image,
StorageMetadata(contentType: 'image/png'),
);
final storageTaskSnapshot = await task.onComplete;
final downloadUrl = await storageTaskSnapshot.ref.getDownloadURL();
await Firestore.instance.collection('post').add(
{
'contents': textEditingController.text,
'displayName': widget.user.displayName,
'email': widget.user.email,
'photoUrl': downloadUrl,
'userPhotoUrl': widget.user.photoUrl,
});
}

Answer 1

final images = await _picker.pickMultiImage(
maxHeight: 1024,
maxWidth: 1024,
imageQuality: 50,
);

Answer 2

I created here 3 functions used to pick files from imagePicker and to upload them to firebase storage.
first, pick images from gallery:
final imageFiles = await pickImages();
second, upload the images:
final path = 'path/where/you/want/to/save/your/images';
final imageUrls = uploadImages(imagesFiles, path)
print(imageUrls);
you can now use the images urls to save to firestore
Future<List<File>> pickeImages() async {
ImagePicker picker = ImagePicker();
final images = await picker.pickMultiImage(
maxHeight: 1000, maxWidth: 1000, imageQuality: 90);
List<File> files = [];
if (images == null || images.isEmpty) return [];
for (var i = 0; i < images.length; i++) {
final file = File(images[i].path);
files.add(file);
}
return files;
}
Future<String?> _uploadImageFile(File file, String path) async {
try {
final storage = FirebaseStorage.instance;
TaskSnapshot? taskSnapshot;
final storageRef = storage.ref().child(path);
final uploadTask = storageRef.putFile(file);
taskSnapshot = await uploadTask.whenComplete(() {});
final imageUrl = await taskSnapshot.ref.getDownloadURL();
return imageUrl;
} catch (e) {
throw Exception(e.toString());
}
}
Future<List<String>> uploadImages(
List<File> files,
String path,
) async {
final urls = <String>[];
try {
if (files.isNotEmpty) {
for (var i = 0; i < files.length; i++) {
final file = files[i];
final imagePath = '$path/${Random().nextInt(10000)}.jpg';
final url = await _uploadImageFile(file, imagePath);
urls.add(url!);
}
}
return urls;
} on FirebaseException {
rethrow;
}
}

Answer 3

Instead of using ImagePicker.pickImage, use ImagePicker.pickMultiImage. That gives you a List instead of an XFile. Then you can just upload all images in the list. For instance, add an image parameter to your _uploadFile Function so that its function signature is
Future _uploadFile(BuildContext context, XFile image)
and just upload all images like
for (final image of images) {
_uploadFile(context, image)
}