Flutter Starter Project

coverage report
style: very good analysis
License: MIT

Generated by the Nero Lab CLI ?

A Nero Lab Project created by Nero Lab CLI.

Getting Started?

This project contains 3 flavors:

  • development
  • staging
  • production

To run the desired flavor either use the launch configuration in VSCode/Android Studio or use the following commands:

# Development
$ flutter run --flavor development --target lib/main_development.dart

# Staging
$ flutter run --flavor staging --target lib/main_staging.dart

# Production
$ flutter run --flavor production --target lib/main_production.dart

Before you push your local branch to remote branch always do this steps:

$ flutter format lib test
$ flutter analyze lib test

*Flutter Starter Project works on iOS, Android, and Web.

Setup GitLab?

Git Branchs

  1. master as development branch (protected)
  2. staging (protected) : for QA to testing App
  3. production (protected) : for production, deploy to Play Store or App Store
  4. features branch

GitLab Flow


  • Create a new local branch for the task and periodically push a branch of the same name on the server

  • When the task is finished, request a Merge Request for the master branch

  • When the submitted changes were reviewed/approved, merge them with the master branch

  • Once in the master, the code must be integrated into the company’s internal environments branches, until reaching the production branch.

  • When being merged into the master, delete the branch where the task was developed leaving the repository more organized.


Features Branch > Master > Staging > Production

Read this for more information GitHub – jadsonjs/gitlab-flow: Shows the Gitlab flow workflow

CI Variables

In your project open settings > CI/CD > Variables , and this variabel:

Gitlab CI Variables

  • Encode the keystore: base64 key.jks
  • Copy the base64 output and create a variable called STORE_FILE
  • Save the store password as STORE_PASSWORD variable
  • Save the key password as KEY_PASSWORDvariable
  • Save the key alias as KEY_ALIAS variable

To make the deployment via Fastlane working, you need to to get API access to Google Play console. To get an api key json file, follow the steps of the Collect your Google credentials section of the Fastlane guide

  • Save the content of the key.json file as JSON_KEY_DATA variable.

To deploy to Firebase App Distribution via Fastlane, follow the steps Firebase App Distribution.

  • Save the Firebase app id as FIREBASE_APP_ID variable
  • Save the firebase cli token as FIREBASE_CLI_TOKEN variable, to get firebase cli token follow this steps

GitLab CI/CD

This is Gitlab pipeline visualize for this project:
Gitlab Pipeline


There are 4 stages:

  1. Test
  2. Build
  3. Staging
  4. Internal_test
  5. Production
1. Test

Test stage will run in all branchs and do this scripts

- flutter format --set-exit-if-changed lib test
- flutter analyze lib test
- flutter test --coverage
- lcov --remove coverage/lcov.info 'lib/*/*.g.dart' 'lib/core/**' -o coverage/lcov.info
- genhtml coverage/lcov.info --output=coverage

If when run flutter format --set-exit-if-changed lib test must no file changed or Gitlab CI will return fail, and make sure no error or warning in this project. So before you push the project to remote you need run this in your local branch

$ flutter format lib test
$ flutter analyze lib test
2. Build

Build stage have two jobs build_android_staging will run when master merge to staging branch and build_android_production will run when merge to production branch.

3. Staging

Staging stage only run in staging branch and will distribute app to Firebase App Distribution for testing by QA to testing the app in staging flavor. In Firebase App Distribution make group with name Tester and add tester’s emails.

4. Internal Test

Internal test stage will distribute production app to internal test in Playstore

5. Production

Production stage will promote app from internal test to production. You need run this manually after internal test app passed from testing in Gitlab CI/CD.

Running Test?

To run all unit and widget tests use the following command:

$ flutter test --coverage

To view the generated coverage report you can use lcov.

# Remove core file and generated file to get actual coverage
$ lcov --remove coverage/lcov.info 'lib/*/*.g.dart' 'lib/core/**' -o coverage/lcov.info

# Generate Coverage Report
$ genhtml coverage/lcov.info -o coverage/

# Open Coverage Report
$ open coverage/index.html

Integration Testing?

Firebase Test Lab

Go to the Firebase Console, and create a new project if you don’t have one already. Then navigate to Quality > Test Lab:


Uploading an Android APK

Create an APK using Gradle:

$ pushd android
# flutter build generates files in android/ for building the app
$ flutter build apk --flavor staging -t lib/main_staging.dart
$ ./gradlew app:assembleAndroidTest
$ ./gradlew app:assembleDebug -Ptarget=integration_test/<name>_test.dart
$ popd

Where <name>_test.dart is the file created in the Project Setup section.

Drag the “debug” APK from <flutter_project_directory>/build/app/outputs/apk/debug into the Android Robo Test target on the web page. This starts a Robo test and allows you to run other tests:


Click Run a test, select the Instrumentation test type and drag the following two files:

  • <flutter_project_directory>/build/app/outputs/apk/debug/<file>.apk
  • <flutter_project_directory>/build/app/outputs/apk/androidTest/debug/<file>.apk


If a failure occurs, you can view the output by selecting the red icon


For more information read Flutter Integration Firebase Test Lab or from flutter doc Integration Testing.

Flutter integration tests on Firebase Test Lab

Integration testing

Integration Testing in Real Device

flutter drive --driver=test_driver/integration_test.dart --target=integration_test/app_test.dart

QA Testing Staging App

We will use Firebase App Distribution to distribute staging app to Tester.
To add tester add emails in folder firebase_app_distribution/testers.txt, or add groups in folder firebase_app_distribution/groups.txt, add emails or groups divided by comma.

Example add testers:

Example add groups:

Testers, QA

Group tester need set up in Firebase Console go to App Distribution > Testers & Groups and add tester to the group.

Working with Translations?

This project relies on flutter_sheet_localization and read documentation of flutter_sheet_localization_generator. for more information.


1. Create a Google Sheet

Create a sheet with your translations (following the bellow format, an example sheet is available here) :


Make sure that your sheet is shared :


Extract from the link the DOCID and SHEETID values : https://docs.google.com/spreadsheets/d/<DOCID>/edit#gid=<SHEETID>) :

2. Declare a localization delegate

Declare the following AppLocalizationsDelegate class with the SheetLocalization annotation pointing to your sheet in a lib/l10n/localization.dart file :

import 'package:flutter/widgets.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter_sheet_localization/flutter_sheet_localization.dart';

part 'localization.g.dart';

@SheetLocalization("DOCID", "SHEETID", 1) // <- See 1. to get DOCID and SHEETID
// the `1` is the generated version. You must increment it each time you want to regenerate
// a new version of the labels.
class AppLocalizationsDelegate
    extends LocalizationsDelegate<AppLocalizationsData> {
  const AppLocalizationsDelegate();

  bool isSupported(Locale locale) => localizedLabels.containsKey(locale);

  Future<AppLocalizationsData> load(Locale locale) =>
  bool shouldReload(AppLocalizationsDelegate old) => false;

3. Generate your localizations

Run the following command to generate a lib/l10n/localization.g.dart file :

$ flutter packages pub run build_runner build

4. Display your labels

import 'package:flutter_starter_project/core/l10n/localizations.dart';

final labels = context.localizations;

print(labels.templated.hello(firstName: "World"));
print(labels.templated.contact(Gender.male, lastName: "John"));

Generate Icon Android IOS

Generate launcher icon for android and ios

$ flutter pub run flutter_launcher_icons:main -f flutter_launcher_icons*

Generate Splashscreen Android IOS

Generate splashscreen for android and ios

$ flutter pub run flutter_native_splash:create


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