Flutter app deploy on Github and Google Play Store

.gitignore

# Miscellaneous
*.class
*.lock
*.log
*.pyc
*.swp
.DS_Store
.atom/
.buildlog/
.history
.svn/

# IntelliJ related
*.iml
*.ipr
*.iws
.idea/

# Visual Studio Code related
.vscode/

# Flutter/Dart/Pub related
**/doc/api/
.dart_tool/
.flutter-plugins
.packages
.pub-cache/
.pub/
build/

# Android related
**/key.jks
**/android/**/gradle-wrapper.jar
**/android/.gradle
**/android/captures/
**/android/gradlew
**/android/gradlew.bat
**/android/local.properties
**/android/key.properties
**/android/**/GeneratedPluginRegistrant.java

# iOS/XCode related
**/ios/**/*.mode1v3
**/ios/**/*.mode2v3
**/ios/**/*.moved-aside
**/ios/**/*.pbxuser
**/ios/**/*.perspectivev3
**/ios/**/*sync/
**/ios/**/.sconsign.dblite
**/ios/**/.tags*
**/ios/**/.vagrant/
**/ios/**/DerivedData/
**/ios/**/Icon?
**/ios/**/Pods/
**/ios/**/.symlinks/
**/ios/**/profile
**/ios/**/xcuserdata
**/ios/.generated/
**/ios/Flutter/App.framework
**/ios/Flutter/Flutter.framework
**/ios/Flutter/Generated.xcconfig
**/ios/Flutter/app.flx
**/ios/Flutter/app.zip
**/ios/Flutter/flutter_assets/
**/ios/ServiceDefinitions.json
**/ios/Runner/GeneratedPluginRegistrant.*

# Exceptions to above rules.
!**/ios/**/default.mode1v3
!**/ios/**/default.mode2v3
!**/ios/**/default.pbxuser
!**/ios/**/default.perspectivev3
!/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages

.travis.yml

os: linux
language: generic
dist: xenial
addons:
  apt:
    packages:
      - lib32stdc++6
jdk: oraclejdk8
sudo: false

before_install:
  - cd $TRAVIS_BUILD_DIR/$FLUTTER_PROJECT_NAME

install:
  - git clone https://github.com/flutter/flutter.git -b stable --depth 1
  - export PATH="$PATH:`pwd`/flutter/bin/cache/dart-sdk/bin"
  - export PATH="$PATH:`pwd`/flutter/bin"
  - flutter doctor -v
  - flutter packages get

static_analysis: &static_analysis
  name: "Static analysis"
  script: flutter analyze --no-pub --no-current-package $TRAVIS_BUILD_DIR/$FLUTTER_PROJECT_NAME/lib $TRAVIS_BUILD_DIR/$FLUTTER_PROJECT_NAME/test

#unit_tests: &unit_tests
#  name: "Unit tests"
#  script: flutter test --no-pub $TRAVIS_BUILD_DIR/$FLUTTER_PROJECT_NAME/test/

widget_tests: &widget_tests
  name: "Widget tests"
  script: flutter test --no-pub $TRAVIS_BUILD_DIR/$FLUTTER_PROJECT_NAME/test/widget_test.dart

#integration_tests: &integration_tests
#  name: "Integration tests"
#  script: flutter drive --target=test_driver/main.dart

build: &build_apk
  name: "Build APK"
  language: android
  jdk:
    - oraclejdk8
  android:
    components:
      - tools
      - tools
      - platform-tools
      - build-tools-28.0.3
      - android-28
      - android-27
  before_script:
    - echo "$PLAY_STORE_UPLOAD_KEY" | base64 --decode > $TRAVIS_BUILD_DIR/$FLUTTER_PROJECT_NAME/key.jks
    - cd $TRAVIS_BUILD_DIR/$FLUTTER_PROJECT_NAME
  script:
    - flutter build apk --release
  deploy:
    - provider: releases
      api_key: $GITHUB_TOKEN
      file: build/app/outputs/apk/release/app-release.apk
      skip_cleanup: true
      name: $TRAVIS_TAG
      on:
        tags: true

google_play: &google_play
  name: "Google Play"
  language: android
  jdk:
    - oraclejdk8
  android:
    components:
      - tools
      - tools
      - platform-tools
      - build-tools-28.0.3
      - android-28
      - android-27
  install:
    - git clone https://github.com/flutter/flutter.git -b stable --depth 1
    - export PATH="$PATH:`pwd`/flutter/bin/cache/dart-sdk/bin"
    - export PATH="$PATH:`pwd`/flutter/bin"
    - flutter doctor -v
    - flutter packages get
    - gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
    - gpg --keyserver hkp://keys.gnupg.net --recv-keys 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
    - rvm get stable --auto-dotfiles
    - rvm install 2.3.7
    - rvm use 2.3.7
    - gem update --system
    - gem install bundler
    - cd $TRAVIS_BUILD_DIR/$FLUTTER_PROJECT_NAME/android
    - bundler update --bundler
    - bundle install --retry=3 --gemfile=$TRAVIS_BUILD_DIR/$FLUTTER_PROJECT_NAME/android/Gemfile
  before_script:
    - cd $TRAVIS_BUILD_DIR/$FLUTTER_PROJECT_NAME
    - echo "$PLAY_STORE_UPLOAD_KEY" | base64 --decode > $TRAVIS_BUILD_DIR/$FLUTTER_PROJECT_NAME/key.jks
    - flutter build appbundle --release
    - cd $TRAVIS_BUILD_DIR/$FLUTTER_PROJECT_NAME
    - export TRACK=$TRAVIS_BRANCH
    - if [[ $TRAVIS_BRANCH == "prod" ]]; then export TRACK=production; fi
    - cd $TRAVIS_BUILD_DIR/$FLUTTER_PROJECT_NAME/android
  script:
    - if [[ $TRAVIS_PULL_REQUEST_BRANCH == beta || $TRAVIS_PULL_REQUEST_BRANCH = alpha || $TRAVIS_PULL_REQUEST_BRANCH = internal ]]; then
        bundle exec fastlane promote;
      else
        bundle exec fastlane release;
      fi

jobs:
  include:
  - <<: *static_analysis
#  - <<: *unit_tests
  - <<: *widget_tests
#  - <<: *integration_tests
  - stage: build
    <<: *build_apk
  - stage: deploy
    <<: *google_play
    
stages:
  - name: test
    if: (NOT branch =~ /^\d*\.\d*\.\d*$/) OR (NOT branch IN (internal, alpha, beta, prod))
  - name: build
    if: (NOT branch =~ /^\d*\.\d*\.\d*$/) OR (NOT branch IN (internal, alpha, beta, prod))
  - name: deploy
    if: (type = push) AND (branch IN (internal, alpha, beta, prod))

cache:
  directories:
  - "$HOME/.pub-cache"

README.md

Flutter app deploy on Github and Google Play Store

Keystore

Generate a .jks for the app with

keytool -genkey -v -keystore $FLUTTER_PROJECT_NAME/key.jks -keyalg RSA -keysize 2048 -validity 10000 -alias key

then encode the key with

base64 key.jks

and copy it in an environment variable in Travis-CI named PLAY_STORE_UPLOAD_KEY, add single quotes before and after the variable value.
Also add the password used for the key generation to an environment variable named UPLOAD_KEY_PASSWORD (single quotes here too).

app/build.gradle

Edit the $FLUTTER_PROJECT_NAME/android/app/build.gradle file like this:

...
def keystoreProperties = new Properties()
def keystorePropertiesFile = rootProject.file('key.properties')
if (keystorePropertiesFile.exists()) {
    keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
}

android {
    ...
    defaultConfig {...}
    signingConfigs {
        release {
            keyAlias keystoreProperties['keyAlias'] != null ? keystoreProperties['keyAlias'] : "key"
            keyPassword keystoreProperties['keyPassword'] != null ? keystoreProperties['keyPassword'] : System.getenv("UPLOAD_KEY_PASSWORD")
            storeFile file("../../key.jks")
            storePassword keystoreProperties['storePassword'] != null ? keystoreProperties['storePassword'] : System.getenv("UPLOAD_KEY_PASSWORD")
        }
    }

    buildTypes {
        release {
            //signingConfig signingConfigs.debug
            signingConfig signingConfigs.release
        }
    }
}
...

key.properties

Add a file at $FLUTTER_PROJECT_NAME/android/key.properties with the following content

storePassword=add_your_password_here
keyPassword=add_your_password_here
keyAlias=key
storeFile=../../key.jks

GitHub token

Generate a new oAuth access token in GitHub here and copy the value in an environment variable named GITHUB_TOKEN.

Deploy to Google Play Store

Install fastlane in your machine using

gem install fastlane -NV

then go to $FLUTTER_PROJECT_NAME/android and run

fastlane init

to setup fastlane in your project, enter the package name exactly as your applicationId in your $FLUTTER_PROJECT_NAME/android/app/build.gradle file.
Then create $FLUTTER_PROJECT_NAME/android/Gemfile with

source "https://rubygems.org"
gem "fastlane"

the run

bundle update

and add both Gemfile and Gemfile.lock to Git.
Then follow this guide to setup fastlane with your Play Console application.
Once completed copy the content of the downloaded JSON file and add it to the Travis-CI environment variables with name GOOGLE_CREDENTIALS (remember the single quotes before and after).