This gist contains a ruby block for setting up a Slack Webhook

Fastfile

# This file contains the fastlane.tools configuration
# You can find the documentation at https://docs.fastlane.tools
#
# For a list of all available actions, check out
#
#     https://docs.fastlane.tools/actions
#
# For a list of all available plugins, check out
#
#     https://docs.fastlane.tools/plugins/available-plugins
#

# Uncomment the line if you want fastlane to automatically update itself
# update_fastlane

default_platform(:android)

platform :android do
  
  before_all do
    # Read the local.properties
    f = File.open("../local.properties", "r")
    ENV["SLACK_URL"] = f.each_line.to_a.last.split('=').last
    f.close
  end
  
  desc "Build a debug APK"
  lane :debug do
    gradle(task: "clean assembleDebug") # https://developer.android.com/studio/build/building-cmdline#DebugMode
  end

  # Runs after all tasks. This block is called only when the executed lane is successful
  after_all do |lane|
    # Slack action
    slack(
      message: "Slack Message Delivered Successfully"
    )
  end

  error do |lane, exception|
    slack(
      message: exception.message,
      success: false
      )
  end
end