Question

我正在尝试获取从Firebase存储上载到Cloud Firestore的图像的下载链接。

成功打印了img的URL，但是在firebase控制台中，它给了我一个空值。

我尝试过多次实现此图片上传，希望能有所帮助。

  String filename;
  String url;
  File image;

  Future _getImage() async {
    var _selectedImage =
        await ImagePicker.pickImage(source: ImageSource.gallery);

    setState(() {
      image = _selectedImage;
      filename = basename(image.path);
    });
  }

  Future<String> _saveImage() async {
    StorageReference ref = FirebaseStorage.instance.ref().child(filename);
    StorageUploadTask uploadTask = ref.putFile(image);

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

    print('LINK URL : $url');

    return url;
  }

  void _addData() {
    Firestore.instance.runTransaction((Transaction transaction) async {
      CollectionReference reference = Firestore.instance.collection('test');
      await reference.add({
        'email': email,
        'title': title,
        'tags': tags,
        'image': url,
      });
    });
  }

Answer 1

编写单独的函数以获取图像的网址

String url;

  getURL() {
    uploadTask.onComplete.then((s) async {
      var dowurl = await (await uploadTask.onComplete).ref.getDownloadURL();
      url = dowurl;

      print(url);

      if (url.isNotEmpty) {
        return addData();
      }
    });
  }

Flutter-如何在Firestore中的图片上传中修复“空”值

1 个答案: