将图像从 flutter 上传到 firebase（没有任何反应）

Question

我尝试将图像从 flutter 上传到 firebase 存储但是当我尝试这样做时没有任何变化。我已经建立了从 firebase 到 flutter 的连接，当我运行代码出现此错误时：[ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: [core/no-app] No Firebase App '[DEFAULT]' has been created - call Firebase.initializeApp()。此外，当我执行代码时，showDialog 方法不会弹出（这是一个弹出屏幕）。提前致谢:)

  class _MyHomePageState extends State<MyHomePage> {
      Future <File> file;
    //final storage = FirebaseStorage.instance;
     openGatePhoto() async{
    final file = await ImagePicker.pickImage(source: ImageSource.gallery);
    var reference = FirebaseStorage.instance.ref().child('last_image/car5');
    await reference.putFile(file);
    //var snapshot = await storage.ref().child('last_image/car5.png').putFile(file).onComplete;
    showDialog(
            context: context,
            builder: (context) => CustomDialogOpen(
                  title: "Gates are open",
                  description:
                      "Licence plate numbers have been successfully stored in the database",
                ));

我尝试修复@jitesh提到的代码，但仍然是同样的错误，代码：

 final file = await ImagePicker.pickImage(source: ImageSource.gallery);
    Reference reference =
        FirebaseStorage.instance.ref().child('last_image/car5');
    FirebaseStorage storage = FirebaseStorage.instance;
    UploadTask uploadTask = reference.putFile(file);
    uploadTask.then((res) {
      res.ref.getDownloadURL().then(
            (value) => print("Done: $value"),
          );
    });

Answer 1

使用StorageTaskSnapshot等待上传完成，其余代码不言自明。

Future uploadImageToFirebase(BuildContext context) async {
        final file = await ImagePicker.pickImage(source: ImageSource.gallery);
        var reference = FirebaseStorage.instance.ref().child('last_image/car5');
        StorageUploadTask uploadTask = reference.putFile(file);
        StorageTaskSnapshot taskSnapshot = await uploadTask.onComplete;
        taskSnapshot.ref.getDownloadURL().then(
              (value) => print("Done: $value"),
            );
      }

此外，您似乎还没有初始化 firebase，请在基础小部件中添加以下代码

@override
  void initState() {
    super.initState();
    setUpFirebase();
  }

  void setUpFirebase() async {
    await Firebase.initializeApp();
  }

对于新的 ImagePicker API 得到这样的文件

        final picker = ImagePicker();
        final pickedFile = await picker.getImage(source: ImageSource. gallery);
        File image = new File(pickedFile.path);

将图像从 flutter 上传到 firebase（没有任何反应）

Uploading image from flutter to firebase (nothing happens)

image

firebase

flutter

firebase-storage