Flutter Upload batch of images and get all those URLs to store in Firestore

Question

I'm trying to upload n number of photos to Firebase Storage and save those URLs in an array inside Firestore, but I am not able to get the downloadURL() or I do not know where to find it rather. I've checked other answers but those were for single files, I'm trying to upload a batch and store the URLs together instead of uploading on and storing the URL to Firestore and so on and so forth...

CODE:

_uploadImages(String userID, String productID, List<File> images, Function onSuccess(List<String> imageURLs), Function onFailure(String e)) {
    List<String> imageURLs = [];
    int uploadCount = 0;

    StorageReference storeRef = FirebaseStorage.instance.ref().child('Products').child(userID).child(productID).child(uploadCount);
    StorageMetadata metaData = StorageMetadata(contentType: 'image/png');

    images.forEach((image) {
      storeRef.putFile(image, metaData).onComplete.then((snapshot) {
        STUCK AT THIS POINT SINCE THE SNAPSHOT DOESN'T SHOW THE URL OPTION...
        //imageURLs.add(snapshot. )
        uploadCount++;

        if (uploadCount == images.length) {
          onSuccess(imageURLs);
        }
      });
    });
  }

Answer 1

You could use this method for multiple file upload to firebase storage where List<Asset> assets are your List<File> files.

Future<List<String>> uploadImage(
      {@required String fileName, @required List<Asset> assets}) async {
    List<String> uploadUrls = [];

    await Future.wait(assets.map((Asset asset) async {
      ByteData byteData = await asset.requestOriginal();
      List<int> imageData = byteData.buffer.asUint8List();

      StorageReference reference = FirebaseStorage.instance.ref().child(fileName);
      StorageUploadTask uploadTask = reference.putData(imageData);
      StorageTaskSnapshot storageTaskSnapshot;

      // Release the image data
      asset.releaseOriginal();

      StorageTaskSnapshot snapshot = await uploadTask.onComplete;
      if (snapshot.error == null) {
        storageTaskSnapshot = snapshot;
        final String downloadUrl = await storageTaskSnapshot.ref.getDownloadURL();
        uploadUrls.add(downloadUrl);

        print('Upload success');
      } else {
        print('Error from image repo ${snapshot.error.toString()}');
        throw ('This file is not an image');
      }
    }), eagerError: true, cleanUp: (_) {
     print('eager cleaned up');
    });

    return uploadUrls;
}

Answer 2

These solutions does not work with firebase_storage: ^5.0.1 as await uploadTask.onComplete; is not applicable anymore. Please suggest any other solution if you upgraded your app. Thanks