Created for the post https://dev.to/rosariopfernandes/run-android-modularized-builds-selectively-on-github-actions-4jp1

README.md

How to use this code

1. Add the build_pull_request.sh to the root of your git repository;
2. Add the android.yml file to .github/workflows/;
3. Make build_pull_request.sh executable using: chmod +x build_pull_request.sh;
4. Commit your code and push the changes

LICENSE

# MIT License
# 
# Copyright (c) 2020 Rosário Pereira Fernandes
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
# associated documentation files (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge, publish, distribute,
# sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all copies or
# substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
# INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
# AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
# DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

android.yml

# MIT License
# 
# Copyright (c) 2020 Rosário Pereira Fernandes
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
# associated documentation files (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge, publish, distribute,
# sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all copies or
# substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
# INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
# AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
# DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
name: Android CI

on:
  - pull_request
  - push

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2
    - name: set up JDK 1.8
      uses: actions/setup-java@v1
      with:
        java-version: 1.8
    - name: Build with Gradle (Pull Request)
      run: ./build_pull_request.sh
      if: github.event_name == 'pull_request'
    - name: Build with Gradle (Push)
      run: ./gradlew clean build
      if: github.event_name != 'pull_request'

build_pull_request.sh

#!/bin/bash

# MIT License
# 
# Copyright (c) 2020 Rosário Pereira Fernandes
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
# associated documentation files (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge, publish, distribute,
# sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all copies or
# substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
# INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
# AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
# DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

# Exit on error
set -e

# unshallow since GitHub actions does a shallow clone
git fetch --unshallow
git fetch origin

# Get all the modules that were changed
while read line; do
  module_name=${line%%/*}
  if [[ ${MODULES} != *"${module_name}"* ]]; then
    MODULES="${MODULES} ${module_name}"
  fi
done < <(git diff --name-only origin/$GITHUB_BASE_REF)
changed_modules=$MODULES

# Get a list of all available gradle tasks
AVAILABLE_TASKS=$(./gradlew tasks --all)

# Check if these modules have gradle tasks
build_commands=""
for module in $changed_modules
do
  if [[ $AVAILABLE_TASKS =~ $module":app:" ]]; then
    build_commands=${build_commands}" :"${module}":app:assembleDebug :"${module}":app:check"
  fi
done

# Build
eval "./gradlew clean ${build_commands}"