NoSuchMethodError: The method 'ref' was called on null

user_14871034 0
Viewed 159

there I want help, I was creating my app with flutter and firebase, there, I want to upload images to firebase storage. so my file

import 'package:firebase_storage/firebase_storage.dart';

 uploadTOFirebase() async {
    final ref = FirebaseStorage.instance.ref('posts/post_$postId.jpg');
    await ref.putFile(image).whenComplete(() async {
      final url = await ref.getDownloadURL();
      setState(() {
        postlink = url;
      });
      // print(postlink);
    });
  }

but that saw me that error

E/flutter (19469): [ERROR:flutter/lib/ui/ui_dart_state.cc(186)] Unhandled Exception: NoSuchMethodError: The method 'ref' was called on null.
E/flutter (19469): Receiver: null
E/flutter (19469): Tried calling: ref("posts/post_27cfad88-62bb-4211-9e5b-0c6d1e9029be.jpg")
E/flutter (19469): #0      Object.noSuchMethod (dart:core-patch/object_patch.dart:54:5)
E/flutter (19469): #1      _UploadState.uploadTOFirebase (package:instaclone/pages/upload.dart:230:48)
E/flutter (19469): #2      _UploadState.HandleSubmit (package:instaclone/pages/upload.dart:226:11)
E/flutter (19469): <asynchronous suspension>
E/flutter (19469):

and I'm using flutter in andoird

firebase-storage flutter-dependencies flutter-test firebase flutter
3 Answers

Try using it like this.

final ref = FirebaseStorage.instance.ref().child("posts/post_$postId.jpg");
user_100182910

Did you call Firebase.initializeApp() anywhere? Without that, the Firebase SDKs won't be able to find your project on Google's servers.

See initializing FlutterFire in the FlutterFire docs for an example of how to do this.

user_2091030 
uploadTOFirebase() async {
    UploadTask storageUploadTask = FirebaseStorage.instance.putFile('posts/post_$postId.jpg');
    TaskSnapshot storageTaskSnapshot =
        await storageUploadTask.whenComplete(() => null);
    String url = await storageTaskSnapshot.ref.getDownloadURL();
    setState((){postlink = url;});
  }

Try this code. Did some small changes.

user_135879870
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