A Completed Functional Flutter App – FindSeat (BLoC + Json API + Unit Test + Firebase Auth)


I. Introduction

I’m Android Developer and I’m working in a software company in Vietnam. I have experience in both kind project: outsourcing project and product project. I decided to study Flutter, because I believe it’s promised in future. As experienced developer, I care about clean architecture, testing, performance and maintainability that why I keep searching for an example of completed application. Unfortunately, community now full of project such as speedcode, UI challenges, … it’s just small pieces of real world application. In fact, most of the project doesn’t have fancy UI like that. That why I build this project by myself and now share it to the community, I hope you can get something from it then apply to your work.

The first version of project (v1.0) is just about UI + simple logic. In this version v2.0, I applied BloC pattern by using Flutter Bloc to project and also have unit tests for it. I also built simple Mock API for the app, it just static json file uploaded to a my private hosting. I hope I have time to do cache local data by SQLite but I have not, so hope next version will be soon available.

Check Video Demo

II. Showcase

2.1. Home

In Home screen, it just simply load then show data to UI. What you can try

2.1.1. Screen: Home 1


  • (0) is about me 😀
  • (1) is carousel slider for displaying banners, it’s automatically animate each 1 second. You can swipe left or right to see next/previous item
  • (2) is list seat categories. If you click on a category, app will open All shows screen. It’s horizontal list so you can swipe to reach more item
  • (3) is recommended seats. Click on item app will open Show details screen
2.1.2. Screen: Home 2


  • (4) is nearby theatres. There’s nothing special to try here, it’s just simple map with highlighted cine’s locations
  • (5) (6) is list shows by each category. Same with recommended seats, you can click on item to open Show details screen

2.2. All Shows

2.2.1. Screen: All Shows 1


  • (1) click to open search field. Basically support search by name
  • (2) click to open sort option. Basically support sort by rating and name
  • (3) there’re 3 tabs: Now showing, Coming soon and Exclusive. You can swipe left/right to view content of each tab
  • (4) Display list show in gridview
2.2.2. Screen: All Shows 2


  • Sort options dialog
2.2.3. Screen: All Shows 3


  • App will perform search after stop typing for 400 milliseconds, technically it’s debounce technique. Try to click on item, app will open Show details screen

2.3. Show info

2.3.1. Screen: Show Info 1


  • (1) is trailer of show from Youtube link
  • (2) show’s description
  • (3) is offer section. This is not static content, it can be changed in mock API
2.3.2. Screen: Show Info 2


  • (4) is user’s review section. Basically write review function is not available yet
  • (5) is casts section. It’s horizontal listview, you can swipe to reach more content.
  • (6) Click Book seats then app will open Book Time Slot screen

2.4. Book Time Slot

2.4.1. Screen: Book Time Slot 1


  • (1) Click to open search field. Basically support search by Cine’s name
  • (2) List cine with time slots. Gray item is time slot that is not available.
2.4.2. Screen: Book Time Slot 2


  • App will perform search after stop typing for 400 milliseconds, technically it’s debounce technique. Click on item time slot, app will open Book Seat Type screen.

2.5. Book Seat Type


  • (1) choose number of seats
  • (2) choose seat type

2.6. Book Seat Slot


  • (1) is count of number booked seats
  • (2) Booked seats. You can click to select then click again to deselect seat.
  • Validate: For example in screen Book Seat Type you chosen 3 seats, type is Jack that mean
    • You cannot select Queen or King seat
    • You cannot book more than 3 seats

2.7. Make payment

2.7.1. Screen: Make payment 1


  • App integrated with Stripe SDK, currently for testing when you click on any method Debit/UDI/Net banking, app only show option pay by input card to the form.
2.7.2. Screen: Make payment 2


  • For testing, please use following information:
    • Card number: 4242 4242 4242 4242
    • Expiration date: 04/24
    • CVC: 424 or 242
2.7.3. Screen: Make payment 3


  • After Stripe verified the payment information, app will show your booking information.

2.8. Login


  • Basically app provide login by user’s email and password. Login by Google and Facebook will be available soon.
  • Test account: [email protected] / 123456

2.9. Register


  • I did validation in this form using Bloc pattern, you can look at this to study how to do form validation in Bloc.



API Usage
/home.json Return data for Home screen
/all_shows_by_type.json Return data for All Shows screen
/booking_time_slot_by_cine.json Return data for Book Time Slot screen
/book_seat_slot_by_time_slot.json Return data for Book Seat Slot screen

IV. Plugins

Plugin Usage
retrofit For working with restful API, generated model
json_annotation Same as above (SAA)
dio SAA
build_runner SAA
flutter_bloc For build app architecture
carousel_slider Use for section banner in Home screen
freezed Working with State of bloc
equatable SAA
meta SAA
intl Format date time and other formats
youtube_player_flutter Display trailer from Youtube link
shared_preferences For caching user’s session
flutter_svg Display svg icon
google_maps_flutter Display address of cine
dotted_border Display dot border of offer ticket in Show details screen
shimmer Animate image place holder
stripe_payment Use in booking feature
firebase_core For register account and login using Firebase
google_sign_in SAA
firebase_auth SAA
test Try to use unit testing, most of the cases come from Bloc
bloc_test SAA

V. Design credit

Author: Dinu Dinesh
Design link: Movie & events ticket booking app

Development Environment

flutter doctor -v

[√] Flutter (Channel stable, 2.8.1, on Microsoft Windows [Version 10.0.19043.1586], locale en-US)
    • Flutter version 2.8.1 at C:\src\flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 77d935af4d (3 months ago), 2021-12-16 08:37:33 -0800
    • Engine revision 890a5fca2e
    • Dart version 2.15.1

[!] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    • Android SDK at C:\Users\ASUS\AppData\Local\Android\sdk
    X cmdline-tools component is missing
      Run `path/to/sdkmanager --install "cmdline-tools;latest"`
      See https://developer.android.com/studio/command-line for more details.
    X Android license status unknown.
      Run `flutter doctor --android-licenses` to accept the SDK licenses.
      See https://flutter.dev/docs/get-started/install/windows#android-setup for more details.

[√] Chrome - develop for the web
    • Chrome at C:\Program Files (x86)\Google\Chrome\Application\chrome.exe

[√] Android Studio (version 3.1)
    • Android Studio at C:\Program Files\Android\Android Studio
    • Flutter plugin version 29.0.1
    • Dart plugin version 173.4700
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b02)

[√] Android Studio (version 3.5)
    • Android Studio at C:\Program Files\Android\android-studio
    • Flutter plugin version 42.1.1
    • Dart plugin version 191.8593
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)

[√] Android Studio (version 3.6)
    • Android Studio at C:\Program Files\Android\AS33
    • Flutter plugin version 49.0.1
    • Dart plugin version 192.8052
    • Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b04)

[√] IntelliJ IDEA Community Edition (version 2020.3)
    • IntelliJ at C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2020.3.1
    • Flutter plugin can be installed from:
    • Dart plugin can be installed from:

[√] IntelliJ IDEA Ultimate Edition (version 2021.1)
    • IntelliJ at C:\Program Files\JetBrains\IntelliJ IDEA 2021.1
    • Flutter plugin can be installed from:
    • Dart plugin can be installed from:

[√] VS Code (version 1.65.0)
    • VS Code at C:\Users\ASUS\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension can be installed from:

[√] Connected device (3 available)
    • sdk gphone x86 (mobile) • emulator-5554 • android-x86    • Android 11 (API 30) (emulator)
    • Chrome (web)            • chrome        • web-javascript • Google Chrome 99.0.4844.74
    • Edge (web)              • edge          • web-javascript • Microsoft Edge 98.0.1108.62

! Doctor found issues in 1 category.

Before run project, execute commands:

  • flutter clean
  • flutter pub get
  • flutter pub run build_runner build or flutter pub run build_runner build --delete-conflicting-outputs
  • flutter run (if needed)


  • If you wanna get updates in next version, please give me a ⭐ to the repo 👍
  • If you love my work and want to support, buy me a coffee here. Thank you so much 👍


View Github