Uploading image from flutter to firebase (nothing happens)

user_12886858 0
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I tried uploading image from flutter to firebase storage but when I try to do so nothing changes. I have made connection from firebase to flutter and when I run the code this error appears: [ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: [core/no-app] No Firebase App '[DEFAULT]' has been created - call Firebase.initializeApp(). Also when I execute the code the showDialog method isn't poping off (This is a popup screen). Thanks in advance :)

  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",
                ));

I tried fixing the code as @jitesh mentioned but still the same error, the code:

 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"),
          );
    });
firebase-storage firebase flutter image
1 Answers

Use StorageTaskSnapshot and wait for the upload completion, the rest code is self-explanatory.

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"),
            );
      }

Also, it seems you haven't initialized firebase, add below code in the base widget

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

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

for the new ImagePicker API get a File like this

        final picker = ImagePicker();
        final pickedFile = await picker.getImage(source: ImageSource. gallery);
        File image = new File(pickedFile.path);
user_51065740
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