Get Download URL from Firebase Storage in Flutter

问题

I'm currently exploring Flutter, I found there is an official Firebase Storage plugin in Flutter firebase_storage I have storage reference like this one:

final StorageReference ref = FirebaseStorage.instance.ref().child("default.png");

But there is no method to get download URL from that StorageReference.

回答1:

If the above solution doesn't work, try this:

Future<String> uploadImage(var imageFile ) async {
    StorageReference ref = storage.ref().child("/photo.jpg");
    StorageUploadTask uploadTask = ref.putFile(imageFile);

    var dowurl = await (await uploadTask.onComplete).ref.getDownloadURL();
    url = dowurl.toString();

    return url; 
}

回答2:

I had Implemented a method to save your image with a timestamp and get the downloadable url.

Future<String>photoOption() async {
    try {
        DateTime now = new DateTime.now();
        var datestamp = new DateFormat("yyyyMMdd'T'HHmmss");
        String currentdate = datestamp.format(now);
        File imageFile = await ImagePicker.pickImage();


        StorageReference ref = FirebaseStorage.instance
            .ref()
            .child("images")
            .child("$currentdate.jpg");
        StorageUploadTask uploadTask = ref.putFile(imageFile);

        Uri downloadUrl = (await uploadTask.future).downloadUrl;
        addUser.downloadablelink = downloadUrl.toString();

        downloadableUrl = downloadUrl.toString();

        print(downloadableUrl);

    } catch (error) {
        print(error);
    }

    return downloadableUrl;
}

回答3:

use url like this:

printUrl() async {
    StorageReference ref = 
        FirebaseStorage.instance.ref().child("images/sky.jpg");
    String url = (await ref.getDownloadURL()).toString();
    print(url);
}

回答4:

He is my solution :

StorageReference storageReference = FirebaseStorage.instance.ref().child("myfile"); 
StorageUploadTask uploadTask = storageReference.putFile(file);
uploadTask.onComplete.then((s){ 
   s.ref.getDownloadURL(); 
});

回答5:

My Solution

Future mainprofile(File image) async {
    try {
      DateTime now = new DateTime.now();
      var datestamp = new DateFormat("yyyyMMdd'T'HHmmss");
      String currentdate = datestamp.format(now);
      _firebaseStorageRef = FirebaseStorage.instance
          .ref()
          .child(userRepository.uid)
          .child('main')
          .child("$currentdate.jpg");
      StorageUploadTask uploadTask = _firebaseStorageRef.putFile(image);
      uploadTask.onComplete.then((onValue) async {
        _mainurl = (await _firebaseStorageRef.getDownloadURL()).toString();
      });
    } catch (error) {
      print(error);
    }
  }

回答6:

Future<String> urlDownload(file) async {
var uuid = Uuid().v1();
StorageReference ref =
    FirebaseStorage.instance.ref().child("post_$uuid.jpg");
StorageUploadTask uploadTask = ref.putFile(file);

String downloadUrl =
    await (await uploadTask.onComplete).ref.getDownloadURL();
return downloadUrl;}

来源：https://stackoverflow.com/questions/48435365/get-download-url-from-firebase-storage-in-flutter

标签

firebase

dart

firebase-storage

Flutter