Get the download URLs of multiple files in firebase storage

Ja'afar Zakariya 0
Viewed 63

So after searching stack overflow for hours, I give up, I can't find a solution that solves my problem, I'm creating an application where users can send multiple photos to each other! The way it works is a user selects the photos from the gallery, it saves the paths to a LIST and it uploads them to firebase storage using a for loop based on the index of that list. Code

        for(int i = 0; i < filePaths.length; i++) {
      List<String> imageLinks = [];
      var imageStorageRef = storage.child(
          'SentImages/${widget.chatRoomID}/$path/${uuid.v1()}');
      imageStorageRef.putFile(filePaths[i]);

The problem is I need to acquire the download URL of the files in firebase storage and save them in a list but no solution works and each time the list comes out as empty. Full code

    Uuid uuid = const Uuid();
Future<void> selectImages() async {
  String path = uuid.v4();
  List<XFile>? selectedImages = await picker.pickMultiImage();
  if (selectedImages != null) {
    List<File> filePaths = [];
    for(int i = 0; i < selectedImages.length; i++){
      filePaths.add(File(selectedImages[i].path));
    }
    for(int i = 0; i < filePaths.length; i++) {
      List<String> imageLinks = [];
      var imageStorageRef = storage.child(
          'SentImages/${widget.chatRoomID}/$path/${uuid.v1()}');
      imageStorageRef.putFile(filePaths[i]);
      final listData = await imageStorageRef.listAll();
      Future.wait(listData.items.map((e) async {
        await e.getDownloadURL().then((value) {
          imageLinks.add(value);
          print(imageLinks);
        });
      }));
      print(imageLinks);
    }

How do I make it acquire each download link as the loop goes or even get the download links of all the files in that folder directly from firebase storage! Thank you.

firebase-storage dart firebase flutter
1 Answers

I think you need to upload photos file by file and store the download url in the list , try this

 static Future<List<String>> uploadFiles(List<File> _images) async {
   var imageUrls = await Future.wait(_images.map((_image) =>uploadFile(_image)));
   print(imageUrls);
   return imageUrls;
 }

 static Future<String> uploadFile(File _image,) async {
   final storageReference = FirebaseStorage.instance.ref()
    .child('images/${_image.path}');
  UploadTask uploadTask = storageReference.putFile(_image);
  await uploadTask.whenComplete((){ });
  return  await storageReference.getDownloadURL();
}

and at last you can call like this

 List<String> urls = await uploadFiles("yourListOfFiles");
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