Question

当我要上传多张图片时，我遇到了问题。我有一个包含“文件”的列表。我阅读了有关它的更多文章，并发现了这一点：

Future<List> uploadImage(List<Object> _imageFile) async {
    final user = await FirebaseAuth.instance.currentUser();
    List _urllist = [];

    int i = 0;
    await _imageFile.forEach((image) async {
      print('igen: ' + image.toString());
      
        // if (ref.getMetadata() != null) {   //should be deleted, but this isn't working
        //   await ref.delete();
        // }
        print(image.imageFile);
        final ref = FirebaseStorage.instance
            .ref()
            .child('business_image')
            .child(user.uid)
            .child(i.toString() + '.jpg');
        i++;
        StorageUploadTask uploadTask = ref.putFile(image.imageFile);
        StorageTaskSnapshot downloadUrl = await uploadTask.onComplete;
        String _url = await downloadUrl.ref.getDownloadURL();
        _urllist.add(_url);
      
    });
    print(_urllist);

    return _urllist;
}

但是当我调用此函数时：

List imageurllist;
final user = await FirebaseAuth.instance.currentUser();
uploadImage(getnewphotos).then((List urls) {
  imageurllist = urls;
  print(urls); //here I try to print it, but it returns null, guess the function don't wait for it?
  Firestore.instance.collection('users').document(user.uid).updateData({
    'email': widget.userData['email'],
    'username': userName != null ? userName : widget.userData['username'],
    'usertype': widget.userData['usertype'],
    'loclat': loclat != null ? loclat : widget.userData['loclat'],
    'loclng': loclng != null ? loclng : widget.userData['loclng'],
    'locationread':
        searchAddr != null ? searchAddr : widget.userData['locationread'],
    'services': serviceList,
    'opening': openstart != null ? openstart : widget.userData['opening'],
    'closing': closeend != null ? closeend : widget.userData['closing'],
    'userImage': imageurllist,
  });

  setState(() {
    isUpload = false;
  });
});

此功能有什么问题，有人可以帮我解决吗？

Answer 1

根据我所做的事情，当用户从手机中选择照片或拍照时，它将把图像添加到List<Object> images'中，这肯定您可能已经实现了自己。

关于上传这些图像，我所做的是将它成批上传到Firebase存储中，然后使用每个用户的url（如果您要使用的网址是我的代码）。

  Future handleUploadImage() async {
    var firebaseUser = await FirebaseAuth.instance.currentUser();

    var uuid = new Uuid();

    try {
      for (int i = 0; i < widget.images.length; i++) {
        final StorageReference storageRef =
            FirebaseStorage.instance.ref().child(uuid.v4());
        final StorageUploadTask task = storageRef
            .child('user_images/${firebaseUser.uid}/')
            .putFile(widget.images[i]);
        await task.onComplete.then((picValue) async {
          await picValue.ref.getDownloadURL().then((downloadUrl) {
            print("URL : " + downloadUrl);
            imageUrl.add(downloadUrl);
          });
        });
      }
    } catch (e) {
      print(e);
    }
  }

请记住，我使用uuid软件包生成不同的图像URL

Flutter将多张图片上传到Firebase

1 个答案: