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Getting started with fastlane for Android

Installing fastlane

{!docs/includes/installing-fastlane.md!}

Setting up fastlane

Navigate your terminal to your project's directory and run

fastlane init

You'll be asked to confirm that you're ready to begin, and then for a few pieces of information. To get started quickly:

  1. Provide the package name for your application when asked (e.g. io.fabric.yourapp)
  2. Press enter when asked for the path to your json secret file
  3. Answer 'n' when asked if you plan on uploading info to Google Play via fastlane (we can set this up later)

That's it! fastlane will automatically generate a configuration for you based on the information provided.

You can see the newly created ./fastlane directory, with the following files:

  • Appfile which defines configuration information that is global to your app
  • Fastfile which defines the "lanes" that drive the behavior of fastlane

The most interesting file is fastlane/Fastfile, which contains all the information that is needed to distribute your app.

Setting up supply

supply is a fastlane tool that uploads app metadata, screenshots and binaries to Google Play. You can also select tracks for builds and promote builds to production!

For supply to be able to initialize, you need to have successfully uploaded an APK to your app in the Google Play Console at least once.

Setting it up requires downloading a credentials file from your Google Developers Service Account.

Collect your Google credentials

{!docs/includes/google-credentials.md!}

Configure supply

Edit your fastlane/Appfile and change the json_key_file line to have the path to your credentials file:

json_key_file "/path/to/your/downloaded/key.json"

Fetch your app metadata

If your app has been created on the Google Play developer console, you're ready to start using supply to manage it! Run:

fastlane supply init

and all of your current Google Play store metadata will be downloaded to fastlane/metadata/android.

Due to limitations of the Google Play API, supply can't download existing screenshots or videos.

What's next?

fastlane is ready to generate screenshots and automatically distribute new builds! To learn more, check out:

Set up environment variables

fastlane requires some environment variables set up to run correctly. In particular, having your locale not set to a UTF-8 locale will cause issues with building and uploading your build. In your shell profile add the following lines:

export LC_ALL=en_US.UTF-8
export LANG=en_US.UTF-8

You can find your shell profile at ~/.bashrc, ~/.bash_profile, ~/.profile or ~/.zshrc depending on your system.

Use a Gemfile

It is recommended that you use a Gemfile to define your dependency on fastlane. This will clearly define the used fastlane version, and its dependencies, and will also speed up using fastlane.

  • Create a ./Gemfile in the root directory of your project with the content
source "https://rubygems.org"

gem "fastlane"
  • Run [sudo] bundle update and add both the ./Gemfile and the ./Gemfile.lock to version control
  • Every time you run fastlane, use bundle exec fastlane [lane]
  • On your CI, add [sudo] bundle install as your first build step
  • To update fastlane, just run [sudo] bundle update fastlane