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flutter-by-example-www's Introduction

Flutter By Example

This is the repo for the Flutter By Example Website

If you're looking for the code needed to participate in the tutorial, it can be found at flutter_by_example github.


screenshot

Flutter By Example is a complete tutorial for building a mobile application with Google's Flutter SDK, inspired by Elixir School.

Flutter is a new, awesome SDK for building cross-platform mobile apps. It's still in Alpha (as of 2/25/18).

This is simply a resource for learning Flutter from scratch.


Contributing

I'm hopeful that more Flutter developers will help make this resource rock solid. If you'd like to help, simply fork and make a PR.

This page is written using Gatsby.js. That said, the only thing you need to know how to do is add a file in the proper place and then write content in markdown. If you're unsure about adding new content, please email me at [email protected].

There are multiple ways you can contribute:

  1. Add a new feature sections to the current tutorial.
    • This would require building on the current content, and adding the current app. Feel free to email me at [email protected].
  2. Add new stand-alone content.
    • If you want to add write a page that is separate from the main tutorial, have at it.
    • These types of lessons would probably be filed under 'Flutter Basics', though we could always add a new section.
  3. Fix errors or improve content.
    • Simply fix something on Github, and make a PR right here.

Contributors will be featured and acknowledged on the Flutter By Example website.


flutter-by-example-www's People

Contributors

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flutter-by-example-www's Issues

Getting a Non-nullable instance on imageUrl in dog_model.dart

MacOS 12.6.1
Dart 2.18.4
Flutter 3.3.8

Following the tutorial, I get the error "Non-nullable instance field 'imageUrl' must be initialized. Try adding an initializer expression, or add a field initializer in this constructor, or mark it 'late'" at the line with:

Dog(this.name, this.location, this.description);

I'm also getting a warning that "The operand can't be null, so the condition is always true. Remove the condition." on the if statement in:

Future getImageUrl() async {
    if (imageUrl != null) {
        return;
    }

Not sure what version of Dart/Flutter the code was written in, but it fails as-is in the current versions (see above for version info).

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