Flutter Presentation showed in Qvik Beers & Pizza event where we showed the pros and cons of different cross platform technologies. We presented how Flutter is used in Freska as main mobile development framework.

1. Flutter
Jon Durán
Head of Mobile @Freska

2. My Background
- +10 years back… Backend engineer using Java
- 2009 Started doing Android development
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3. My Background
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4. My Background
- +10 years back… Backend engineer using Java
- 2009 Started doing Android development
- February 2017, used Kotlin in a production app.
- 4th November 2018, O lines of code written in Dart.
- 19th December 2018, Freska app in Flutter completed
- Layered architecture
- Tests
- CI/CD setup
- Integrated POEditor translations into CI
- 4th January 2019, Freska app released
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5. Freska App in Flutter vs iOS Native App
DEMO
Flutter in Freska
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6. What is Flutter?
- Open source mobile for now development SDK by
Google
- No OEM Widgets, WebViews, JavaScript bridges, etc.
- Flutter architecture:
- Framework (Dart)
- SKIA
- Dart
- C++
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7. Who is Flutter for?
- Developers who want to build faster and easier apps
- Single source code, used in Android & iOS
- Good performance
- Native look and feel
- Fast prototyping
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- Companies:
- Single team for both platforms
- Launch features Android & iOS together
- Lower maintenance
- Stable release since December 2018

8. Same design for Android & iOS?
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9. Same design for Android & iOS?
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10. How to write Flutter
- Dart!
- Java-ish styled
- … need to generate equals && hashCode methods :(
- Easy to learn & read
- How I learned -> https://www.dartlang.org/guides/language/language-tour
class FAQContent {
const FAQContent(this.question, this.answer);
final String question;
final String answer;
}
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main() {
Box box1 = new Box();
box1?.destroy();
}

11. How to write Flutter
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- Dart!
- Optional parameters
- Mixins
- Functions as first class citizens
- Good IDEs: Android Studio, IntelliJ, Visual Studio
- Futures, Streams, RxDart
- But…
- Back to NPE hell! Lack of Null Safety types
- No extension functions
- No data classes
- No sealed classes

12. What did you like about Flutter?
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- Stateful hot reload
- It makes you extremely efficient!!
- Everything you need to build apps
- Widget compositions
- Suggested architecture since beginning
- For ex. BLoC pattern (kind of MVVM)
- Firebase!
- Easy to create plugins
- Stability
- Upgrading versions does not break the build
- Simplicity
- Rotating the screen is not as complex as solving a NP problem

13. What did you NOT like about Flutter?
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- Figuring out how to save screen state
- Localisation is complex (compared to native)
- Dart is good, but not that good
- Error logs are confusing
- You still need to go to native
- Some 3rd party SDK
- Accessing sensors
- WebViews?

14. Demo!
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15. How to get started?
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- Materials:
- https://dartlang.org/
- https://flutter.dev/
- https://github.com/flutter/flutter
- https://flutter.dev/docs/codelabs
- Flutter youtube channel
- Widget of the week videos!
- Code, code, code, code!
- Flutter create
- Create a novel experience with Flutter in 5KB or less of Dart code
- Prizes up to 10K$
- https://flutter.dev/create

16. Questions?
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¿?