Uploading multiple images and waiting for the URL list, images were loaded to firestore successfully after few seconds and returns the url but before that the future function returns with null
Future<List<dynamic>> uploadImage() async {
_imageFile.forEach((image) async {
String rannum = Uuid().v1();
StorageReference reference =
FirebaseStorage.instance.ref().child('Reviews').child(rannum);
StorageUploadTask uploadTask = reference.putFile(image);
StorageTaskSnapshot downloadUrl = (await uploadTask.onComplete);
String _url = await downloadUrl.ref.getDownloadURL();
_urllist.add(_url);
});
return _urllist;
}
You have to call your function like this:
uploadImage(_imageFile).then((List<String> urls) => urls.forEach((element) => print(element)))
And I also changed your function:
Future<List<String>> uploadImage(List<File> _imageFile) async {
List<String> _urllist = [];
await _imageFile.forEach((image) async {
String rannum = Uuid().v1();
StorageReference reference =
FirebaseStorage.instance.ref().child('Reviews').child(rannum);
StorageUploadTask uploadTask = reference.putFile(image);
StorageTaskSnapshot downloadUrl = await uploadTask.onComplete;
String _url = await downloadUrl.ref.getDownloadURL();
_urllist.add(_url);
});
return _urllist;
}
also I don't understand why you enclosed with brackets "await uploadTask.onComplete"
Related
I want to retrieve the URL of a Uint8List image from firebase storage. But I am not able to do that. It prints a snapshot, not the url. Please help.
my code:
void _storeSignature() async {
try {
final Uint8List? signature = await exportSignature();
final FirebaseStorage? storage = FirebaseStorage.instance;
final String? pictureUrl =
"signature/${DateTime.now().millisecondsSinceEpoch.toString()}.png";
final ref = storage!.ref().child(pictureUrl!);
final uploadTask = ref.putData(signature!);
final downurl = await uploadTask.whenComplete(() {
return ref.getDownloadURL();
});
final url = downurl.toString();
print(url);
} catch (e) {
rethrow;
}
}
You have to await for the URL when calling ref.getDownloadURL()
change
return ref.getDownloadURL();
into
return await ref.getDownloadURL();
The UploadTask class extends Future, so you can also use await there already:
await ref.putData(signature!);
final downurl = await ref.getDownloadURL();
final url = downurl.toString();
I'm using latest firebase_storage version now some methods and references of storage are updated ploadTask.onComplete does not support.
so how do I get uploaded pdf url?
Piece of code:
Future<String> uploadPdfToStorage(File pdfFile) async {
try {
Reference ref = FirebaseStorage.instance.ref().child('pdfs/${DateTime.now().millisecondsSinceEpoch}');
UploadTask uploadTask = ref.putFile(pdfFile, SettableMetadata(contentType: 'pdf'));
String downloadUrl = await (await uploadTask.onComplete).ref.getDownloadURL();
final String url = await downloadUrl;
print("url:$url");
return url;
} catch (e) {
return null;
}
}
Here's an edited code that should work with the latest firebase storage_package:
Future<String> uploadPdfToStorage(File pdfFile) async {
try {
Reference ref =
FirebaseStorage.instance.ref().child('pdfs/${DateTime.now().millisecondsSinceEpoch}');
UploadTask uploadTask = ref.putFile(pdfFile, SettableMetadata(contentType: 'pdf'));
TaskSnapshot snapshot = await uploadTask;
String url = await snapshot.ref.getDownloadURL();
print("url:$url");
return url;
} catch (e) {
return null;
}
}
Hey In my app you can edit your profile for example select a picture from your gallery for your profile picture. All work fine when I'm in the app. But when I close the app and open it again the profile picture is gone. When I select a picture from the gallery the url is stored in cloud firebase. In my code I retrieve the url from cloud firebase and want that this Constants.URL_Profil_Picture = value.docs[0].data()['url']; is work. But it doesnt work. Does anyone know why?
final FirebaseFirestore _fireStore = FirebaseFirestore.instance;
getData() async {
return await _fireStore.collection("SerX").get();
}
Future uploadPic(BuildContext context) async {
String fileName = basename(_image.path);
StorageReference firebaseStorageRef = FirebaseStorage.instance.ref().child(
fileName);
StorageUploadTask uploadTask = firebaseStorageRef.putFile(_image);
StorageTaskSnapshot taskSnapshot = await uploadTask.onComplete;
var downUrl = await (await uploadTask.onComplete).ref.getDownloadURL();
_URL = downUrl.toString();
setState(() async {
print('Profile Picture uploaded');
var firebaseUser = await FirebaseAuth.instance.currentUser;
FirebaseFirestore.instance.collection("SerX").doc(firebaseUser.uid).update({"url" : downUrl});
getData().then((value){
if(value.docs.length > 0){
Constants.URL_Profil_Picture = value.docs[0].data()['url'];
print(value.docs[0].data()['url']);
}
});
print(Constants.URL_Profil_Picture);
Scaffold.of(context).showSnackBar(
SnackBar(content: Text('Profile Picture Uploaded')));
});
}
I would like to retrieve the Download URL of a private image in firbase storage.
Hi have tried many of the suggestions on the site, but all of them end up in the same result.
I have tried the following code:
getImageNow() async {
StorageReference ref =
FirebaseStorage.instance.ref().child("/1.jpg");
String url = (await ref.getDownloadURL()).toString();
return url;
}
It works when i print the url inside the function, but when i try to call print(getImageNow())to get the url, i just get "Instance of 'Future<dynamic>'"
UPDATE*************
In the end i am trying to get somthing like this:
return Image.network(
getImageNow(),
);
But i can not get it to work with async.
Since getImageNow() is asynchronous (as indicated by the async keyword), you will need to use await to make the calling code wait for the result:
print(await getImageNow())
What await does here is that it essentially unwraps the Future and is equivalent to:
getImageNow().then((value) => print(value));
this is how i upload and get the download url
this part is how i get image from picker
Future getImage() async {
var image = await ImagePicker.pickImage(source: ImageSource.gallery);
setState(() {
_image = image;
print('Image Path $_image');
});
}
then i upload it
Future uploadPic(BuildContext context) async {
String fileName = basename(_image.path);
StorageReference firebaseStorageRef = FirebaseStorage.instance.ref().child(fileName);
StorageUploadTask uploadTask = firebaseStorageRef.putFile(_image);
StorageTaskSnapshot taskSnapshot = await uploadTask.onComplete;
final String url = (await taskSnapshot.ref.getDownloadURL());
print('URL Is $url');
}
hope it will help someone
I want to implement sending files to Firebase Storage, as well as get a link to it. But for some reason it does not work ...
void _pickFile() async {
File file = await FilePicker.getFile(type: FileType.ANY);
StorageReference ref = FirebaseStorage.instance.ref()
.child("image${Random().nextInt(999)}.jpg");
var fileUrl = ref.putFile(file).onComplete.then((file) =>
file.ref.getDownloadURL());
print(fileUrl);
_sendMessage(fileUrl: fileUrl.toString());
}
...
prefixIcon: IconButton(
icon: Icon(Icons.attach_file),
color: Colors.white,
onPressed: () => _pickFile()
)
Why do I get this instead of a link?
I/flutter (16610): Instance of 'Future'
I need a link in the String!
What is the problem?
Like the log say, fileUrl is a Future who is not resolved yet. You should make sure it's resolve to make use of the string give.
void _pickFile() async {
File file = await FilePicker.getFile(type: FileType.ANY);
StorageReference ref = FirebaseStorage.instance.ref()
.child("image${Random().nextInt(999)}.jpg");
String fileUrl = await (await ref.putFile(file).onComplete).ref.getDownloadURL();
print(fileUrl);
_sendMessage(fileUrl: fileUrl.toString());
}
You need use await for Future functions
void _pickFile() async {
File file = await FilePicker.getFile(type: FileType.ANY);
StorageReference ref = FirebaseStorage.instance.ref()
.child("image${Random().nextInt(999)}.jpg");
final StorageUploadTask uploadTask = ref.putFile(file);
StorageTaskSnapshot taskSnapshot = await uploadTask.onComplete;
String downloadUrl = await taskSnapshot.ref.getDownloadURL();
_sendMessage(fileUrl: downloadUrl);
}
It would look like this without using await
void _pickFile() async {
File file = await FilePicker.getFile(type: FileType.ANY);
StorageReference ref = FirebaseStorage.instance.ref()
.child("image${Random().nextInt(999)}.jpg");
ref.putFile(file).onComplete.then((file){
var fileUrl = file.ref.getDownloadURL());
_sendMessage(fileUrl: fileUrl.toString());
});
}
here is my solution to upload and get the uploaded image url
first i get image with image picker
Future getImage() async {
var image = await ImagePicker.pickImage(source: ImageSource.gallery);
setState(() {
_image = image;
print('Image Path $_image');
});
}
then i upload to firebase
Future uploadPic(BuildContext context) async {
String fileName = basename(_image.path);
StorageReference firebaseStorageRef = FirebaseStorage.instance.ref().child(fileName);
StorageUploadTask uploadTask = firebaseStorageRef.putFile(_image);
StorageTaskSnapshot taskSnapshot = await uploadTask.onComplete;
final String url = (await taskSnapshot.ref.getDownloadURL());
print('URL Is $url');
setState(() {
print("Profile Picture uploaded");
print("....................$url");
Scaffold.of(context).showSnackBar(
SnackBar(content: Text('Profile Picture Uploaded')));
});
}
this is the part i get the downloadUrl of currently uploaded image
final String url = (await taskSnapshot.ref.getDownloadURL());
print('URL Is $url');