I have firebase realtime database. When I manually change data on the Firebase console, vscode stops responding and throws the following error. Error: TypeError: Instance of '_Exception': type '_Exception' is not a subtype of type...

Dart

Flutter

How can I get icon from Google icons by code point?

10 Mar 2024 by Andre Oosthuizen

Quote: Thanks for your response. I asked this question in more detail on stackoverflow. Unfortunately I will not be visiting StackOverflow to view your question, I doubt i if anyone else would. Please give full detail here by using the Improve...

Dart

Flutter

How can I get icon from Google icons by code point?

9 Mar 2024 by gacar

I want use a google fonts icon. I have Code point (e88e, info icon). But i cannot get right icon. How can i get icon from google icons by Code point? Thanks. This is icon link: Material Symbols and Icons - Google Fonts[^] import...

Dart

Flutter

How can a value be assigned to a variable of an extended class?

3 Mar 2024 by M-Badger

The issue with your code is that you're trying to assign a value to value1A directly in the class body of B. In Dart, you can’t assign values to inherited variables directly in the class body. You should do this inside a method or constructor. ...

Dart

Flutter

How can a value be assigned to a variable of an extended class?

3 Mar 2024 by gacar

Hello, I want set a value of extended class. How can i do it? Thanks. class A { String? value1A; A({ this.value1A, }); } class B extends A { String value1B = ""; value1A= ""; //

Dart

Flutter

Flutter chewie video player stuck on loading forever

1 Mar 2024 by Member 14933789

Hey, codeproject wonderful community! I am trying to implement the Chewie Flutter package into my app as a custom widget and I got everything down and made it as customizable as possible. It complies well, but when I run it on the web, android,...

Dart

Flutter

video

Should I use SQL DB + ASP.NET API or firebase/appwrite for my flutter ERP project?

25 Feb 2024 by SulfySul

I have been working on Flutter development using SQL Database + ASP.NET REST API for the backend. However, I'm now considering transitioning to either Firebase or Appwrite due to their increasing popularity and ease of implementation. As I plan...

SQL

ASP.NET-Core

Flutter

Problem when connecting django and flutter websockets

16 Feb 2024 by Andre Oosthuizen

You have basically answered your own question without knowing it - Quote: Then I made my consumers.py (here I'm a little bit confused, isn't it better to refer to my room unique_id instead of name, since the ID is unique and not the name in my...

Problem when connecting django and flutter websockets

16 Feb 2024 by gsemerdz

I'm trying to establish a connection with my Django backend and Flutter code using WebSockets, but unfortunately I'm unable to do so, went through many articles and videos and everyone is basically doing the same without receiving an error.....

Getting errror sending transaction : typeerror: cannot read properties of undefined (reading 'providers') in blockchain app in flutter

8 Feb 2024 by Dave Kreskowiak

The message "Cannot read properties of undefined" is javascript-ese for trying to use an object that doesn't exist, or is null in other lanugages. I don't see a "providers" property or method being called anywhere in the code you posted, so that...

Flutter

blockchain

Getting errror sending transaction : typeerror: cannot read properties of undefined (reading 'providers') in blockchain app in flutter

7 Feb 2024 by Karthik Shettigar

import 'package:flutter_web3/flutter_web3.dart'; import 'package:web3dart/web3dart.dart' as web; import 'package:web3dart/credentials.dart'; String currentAddress = ''; bool get isEnabled = ethereum != null; bool get isConnected =isEnabled &&...

Flutter

blockchain

How can write if condition in widget property?

28 Jan 2024 by gacar

I want to use if condition in the icon widget, but Dart gives an error. How should it be used correctly? Thanks. class Cell extends StatelessWidget { const Cell({super.key, this.caseTrend = false}); final bool caseTrend; @override ...

Dart

Flutter

How can write if condition in widget property?

28 Jan 2024 by M Imran Ansari

Unfortunately, you can’t write if statement directly inside your widget properties as if you were writing in your method or function. But there are a few ways you can write a conditional statement inside your widget. You can use the ternary...

Dart

Flutter

Failure [INSTALL_FAILED_CONTAINER_ERROR: failed to extract native libraries, res=-18] error launching application on SDK gphone64 arm64

21 Jan 2024 by Richard MacCutchan

Se https://stackoverflow.com/questions/77663954/flutter-failed-to-extract-native-libraries-res-18[^]

Dart

Flutter

Failure [INSTALL_FAILED_CONTAINER_ERROR: failed to extract native libraries, res=-18] error launching application on SDK gphone64 arm64

20 Jan 2024 by Kavya Bhargava

I am receiving this error: Error: ADB exited with exit code 1 Performing Streamed Install adb: failed to install /Users/XXX/FlutterDev/XXX_app/build/app/outputs/flutter-apk/app-debug.apk: Failure [INSTALL_FAILED_CONTAINER_ERROR: Failed to...

Dart

Flutter

Receiving: a problem occurred configuring project for multiple packages of mine

17 Jan 2024 by Kavya Bhargava

I after a long time was working on one of my projects so I updated my flutter code and packages too. I started receiving error: A problem occurred configuring project for "package name". At first, it was for cloud firestore and firebase ones but...

Dart

Flutter

Having problems with configuring mobile apps for duende identity server

24 Nov 2023 by Graeme_Grant

For Identity, cookies are okay for non-mobile applications. For mobile, you will need to use Bearer tokens.

Dart

identity-server

Flutter

Having problems with configuring mobile apps for duende identity server

24 Nov 2023 by Trần Toàn from Hanoi

I am encountering difficulties with my Duende Identity Server implementation. The server successfully provides tokens to a WPF Desktop client, but I'm facing issues when trying to obtain an access token from the server using a mobile app. I...

Dart

identity-server

Flutter

Issue with generating $initgetit in injectable for flutter

20 Nov 2023 by wseng

You need to run flutter packages pub run build_runner build after flutter pub run build_runner watch --delete-conflicting-outputs

Error: task index 1 failed: retries exhausted after 4 attempts, with error: HTTP error: 400, precondition check failed.

16 Nov 2023 by Vardaan Grover

I am facing issues deploying my Flutter web app to Firebase Hosting. The deployment process was working fine, but now I'm encountering a persistent HTTP 400 error with the message "Precondition check failed" during deployment. The deployment...

web-hosting

Flutter

deployment

Issue with generating $initgetit in injectable for flutter

19 Oct 2023 by 10. Gunawan.Widya.Nugraha XI RPL 2

I'm facing a problem in my Flutter project where I'm trying to generate the $initGetIt function using Injectable, but it's not being generated as expected. Here are the details of the issue: I've checked my pubspec.yaml, and the dependencies...

How to create your back end API using PHP to communicate with your flutter app?

13 Sep 2023 by Gcobani Mkontwana

I have created a signup.php file as back end API, the problem now is how do I call this file on my flutter app(registration page)? I am getting cors issue. Maybe I am missing some steps. Please advice because I can't use locahost:port number as...

MySQL

PHP

Flutter

How to create your back end API using PHP to communicate with your flutter app?

13 Sep 2023 by Chris Copeland

One possible solution would be to configure CORS by placing a .htaccess file in your PHP base directory and configure the CORS headers in there, as such: Header set Access-Control-Allow-Origin "*" Header set Access-Control-Allow-Headers "origin,...

MySQL

PHP

Flutter

Platformexception (videoerror, video player had error com.google.android.exoplayer2.exoplaybackexception: source error, null, null)

4 Sep 2023 by Member 16085620

Put this in your AndroidManifest.xml

Dart

Flutter

Flutter firebase: get data from subcollection

28 Aug 2023 by EBENEZER OCANSEY

In my app, person A makes a post in a collection called "ADS". Person B clicks on the post and clicks on the button to send a request to person A. This creates a subcollection called "REQUESTS". I want that in the case where person B clicks on...

Flutter

Flutter firebase: get data from subcollection

28 Aug 2023 by Andre Oosthuizen

Your code is generally on the right track, I made small tweaks for you but as your code is now, you should be fine - StreamBuilder( stream: FirebaseFirestore.instance .collection("ADS") .doc(widget.selectedAds?['Uid'] ?? "") ...

Flutter

Problem with Google_maps_flutter in flutter

24 Jul 2023 by MohammedZr

Hello I'm trying to use the google_maps_flutter package to make a Google map for the Client so that he can Track and locate Orders within the application the maps are not showing from the first time Even though you see in this code the GoogleMap...

Dart

Flutter

google-api

How to write a federated plugin in flutter?

12 Jun 2023 by Aryaveer Chaudhary

I am writing a federated plugin in Flutter but acc to url_launcher . I have to create app_facing_package, platform_package and platform_interface_package but I don't know what to write in these packages What I have tried: in docs, there is a...

How to write a federated plugin in flutter?

12 Jun 2023 by Richard MacCutchan

See Developing packages & plugins | Flutter[^].

Automatic update app

5 Jun 2023 by Luis M. Rojas

Hello everybody, I have a flutter app. We published the app on google play Is there is a way that user recive a msg when a new version is it ready on google play? Of course, the user ( i suppose) first has to open the app on the movil What I...

Automatic update app

5 Jun 2023 by Andre Oosthuizen

The easiest way is to make use of the version component to manage any updates - 1. Version your Android App steps[^] 2. How to inform the users of an Android app that a new version is available in the Google Play Store through Notification[^] 3....

Automatic update app

5 Jun 2023 by Dave Kreskowiak

The best source of information on this would be a forum dedicated to the Google Play API. Google Play Developer Community[^]

Viewing DOCX/DOC file from encoded base64 string in flutter?

5 Jun 2023 by Dan Sep2022

I have base64 encoded string version of docx file stored in my database and I have to embed into my Flutter app to view the content of the file and I come up with this solution using webview_flutter which apparently I got from ChatGPT ...

Dart

Flutter

Flutter update a field in firebase with query from subcollection?

28 Mar 2023 by EBENEZER OCANSEY

I have been able to query a data in a subcollecion directly using collectiongroup with the following code in flutter: What I have tried: final uid = FirebaseAuth.instance.currentUser!.uid; QueryDocumentSnapshot>?...

Flutter

Got error bool flutter

15 Mar 2023 by Alva Rizky

On this code, i try to create Delete features, which is can delete history/data that already added. Here's the code : menuOption(String value, History history) async { if (value == 'update') { Get.to(() => UpdateHistoryPage( ...

Dart

Flutter

Got error bool flutter

15 Mar 2023 by OriginalGriff

Thee error message is pretty explicit: the function returns a nullable value - bool? - and you are trying to store it in a non-nullable type - bool; the types are not the same. The simplest solutions are to change the type of yes to bool?, or...

Dart

Flutter

How to save (database) bool using shared preferences - flutter(dart)

15 Mar 2023 by Tiaan 2023

I want to save a bool value (The value is already made in my Firebase Realtime Database whith a default value of false), but when I save the value it doesn't save. I follow the videos I use their code examples (modified to work for my code ofc)...

Dart

Flutter

boolean

Stop flutter scrolling gridview listtiles appearing below scroll container

14 Mar 2023 by Graeme Perrins

I have a Flutter scrolling GridView builder that looks like it renders the ListTiles below the Container the GridView is placed in. It appears it renders placeholder grid list tiles even when they are not within the Container bounds. It looks...

Flutter

Gridview

Got error in flutter PHP

10 Mar 2023 by Alva Rizky

Uncaught mysqli_sql_exception: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'user . FormatException: Unexpected character (at character 1) Here its my...

PHP

Flutter

Got error in flutter PHP

10 Mar 2023 by OriginalGriff

To add to what Richard has said ... You should expect to get syntax errors every day, probably many times a day while you are coding - we all do regardless of how much experience we have! Sometimes, we misspell a variable, or a keyword; sometimes...

PHP

Flutter

Got error in flutter PHP

10 Mar 2023 by Richard MacCutchan

Look at the text, you have a space between id_ and user..

PHP

Flutter

Flutter not detecting changes on global variable from different function

8 Mar 2023 by Richard MacCutchan

This is the same issue as your previous question at Type 'null' is not a subtype of type 'string' while trying to retrieve data from list into listview[^]. You need to look at the code at ... var custUsernameGet = await...

Dart

Flutter

Flutter not detecting changes on global variable from different function

8 Mar 2023 by Dan Sep2022

I have a function that will retrieve username from database and that username value will be stored in global string variable, everything works, and my goal is to display that username variable on the AppBar text but I keeps getting "Null is not a...

Dart

Flutter

Type 'null' is not a subtype of type 'string' while trying to retrieve data from list into listview

5 Mar 2023 by Dan Sep2022

This problem is driving me crazy and I don't know what to do anymore I'm completely lost and it's ruining my life. I'm trying to insert a list values which I retrieved from MySQL database into listView when the user pressed a button but the...

Dart

Flutter

My flutter share button is working extremely slow

18 Feb 2023 by Kavya Bhargava

My flutter share button is running extremely slow. Reason I think is that it has to screenshot the image after getting from firebase for each specific news.(My Assumption) Share button: IconButton( onPressed: () async { ...

Dart

Flutter

Flutter not retrieving variable new value while calling in another class

14 Feb 2023 by Dan Sep2022

I have this StatefulWidget that supposed to retrieve data from MySQL database based on condition and add those retrieved values into an array so I can use the array values to be display on ListView. My Problem is that sometimes when the array...

Dart

MySQL

Flutter

How can I connect to an api rest in flutter

27 Jan 2023 by Luis M. Rojas

Hello, I am new in flutter, this is my code to connect to an API REST final String _baseUrl = 'https://localhost:7254/api/login/getTokenLogin'; final Map authData = { 'email': email, 'password': password }; ...

How can I connect to an api rest in flutter

27 Jan 2023 by Luis M. Rojas

I found this soluction and its WORKS for me: class PostHttpOverrides extends HttpOverrides { @override HttpClient createHttpClient(context) { return super.createHttpClient(context) ..badCertificateCallback = ...

Flutter mysql_client not returning correct datatype of encrypted string

17 Jan 2023 by Andre Oosthuizen

As per the documentation found HERE, try the following - var source = 'flutter app'; final decrypted = encrypter.decrypt64(source, iv: iv); For normal Direct decryption, you can use the decrypt method directly, as: final plainText =...

MySQL

Flutter

encryption

Flutter mysql_client not returning correct datatype of encrypted string

17 Jan 2023 by Dan Sep2022

Hello, I'm trying to decrypt a text from MySQL db (stored in BLOB column) and I encountered with this issue where when I tried to decrypt that value I got an error saying Unhandled Exception: type 'String' is not a subtype of type 'Encrypted'...

MySQL

Flutter

encryption

Unable to remove authentication ask from firebase storage

10 Jan 2023 by Kavya Bhargava

I have connected this app with my firebase console. I am trying to upload videos from the app to firebase storage so that another app connect to same console (which has authentication) can display it I am getting this error when I upload: ...

google-cloud

Flutter

Google-Cloud-Storage

Flutter API post method can not send data to SQL server localhost. Show error "HTTP error 400. The request hostname is invalid"

20 Oct 2022 by enamul haque

In "bb" variable all data show in json format when i debugged. but show this error "HTTP Error 400. The request hostname is invalid". This json data is working in Postman Please Help!!!! What I have tried: void send() async { var...

How to model data of a multidimensional array with different hierarchy

12 Oct 2022 by abimjoshi7

I am working with an expansion tile in a flutter that shows user information in an irregular hierarchical order. I am optimizing the code to increase the performance of the expansion tile widget. Unit-III hierarchy differs from the rest and I am...

Dart

Flutter

JSON

Problem with data.data code for information retrieval in firebase

4 Oct 2022 by ago2486

Quote: here's what the error says: The 'data' method cannot be invoked unconditionally because the receiver may be 'null'. Try making the call conditional (using '?.') or adding a null check to the target and here is the full code: //import...

Flutter

Problem with data.data code for information retrieval in firebase

3 Oct 2022 by ago2486

good evening sir, ladies, I have an error that I can't resolve despite the tips I got on the net. please guide me. I am told this: The method 'data' can't be unconditionally invoked because the receiver can be 'null'. Try making the call...

Flutter

Problem with data.data code for information retrieval in firebase

3 Oct 2022 by Richard Deeming

Follow the very clear instructions from the error message: Quote: Try making the call conditional (using '?.') or adding a null check to the target ('!'). So either: Map? _productMap = productSnap.data?.data(); Or, if you're certain the data...

Flutter

What I should learn with dart ? and how long does it take to learn ?

27 Aug 2022 by mustafa aboud

im confused among dart dart and kotlin so if i basically dont know about programming will easily learn dart ? what beside should i learn plus flutter ? dart will be enoght to build web apps and android ( with flutter ( ? What I have tried: ...

Dart

Flutter