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Ground mobile data collection app for Android
Branch: master
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Latest commit 900fdeb Jun 12, 2019

Ground for Android

Ground is a free, map-centric data collection platform for occasionally connected devices.

This is not an officially supported Google product; it is currently being developed by volunteers on a best-effort basis.


First, read the contribution guidelines. Ensure you understand the code review and community guidelines and have signed the appropriate CLA.

❗️ We cannot accept contributions from contributors that have not signed the appropriate CLA, so please be sure to sign one before submitting your hard work!

After you have read and understood the contribution guidelines, read the following sections to learn how to fork this repository and contribute.


The following instructions describe how to fork this repository in order to contribute to the ground-android codebase.

  1. Fork this repository, see

  2. Clone your fork:

    git clone<username>/ground-android.git

    Where <username> is your github username.

  3. Add the base repository as a remote:

    git remote add upstream

  4. Follow the instructions under the Initial build configuration section of this readme to set up your development environment.

Development Workflow

After you have forked and cloned the repository, use the following steps to make and manage changes. After you have finished making changes, you can submit them to the base repository using a pull request.

  1. Pull changes from the base repository's master branch:

    git pull upstream master

  2. Create a new branch to track your changes:

    git checkout -b <branch>

    Where <branch> is a meaningful name for the branch you'll use to track changes.

  3. Make and test changes locally.

  4. Add your changes to the staging area:

    git add <files>

    Where <files> are the files you changed.

    Note: Run git add . to add all currently modified files to the staging area.

  5. Commit your changes:

    git commit -m <message>

    Where <message> is a meaningful, short message describing the purpose of your changes.

  6. Pull changes from the base repository's master branch, resolve conflicts if necessary:

    git pull upstream master

  7. Push your changes to your github account:

    git push -u origin <branch>

    Where <branch> is the branch name you used in step 2.

  8. Create a pull request to have your changes reviewed and merged into the base repository. Reference the issue your changes resolve in either the commit message for your changes or in your pull request.

    ❗️ Any subsequent changes committed to the branch you used to open your PR are automatically included in the PR. If you've opened a PR but would like to continue to work on unrelated changes, be sure to start a new branch to track those changes.

    For more information on creating pull requests, see

    To learn more about referencing issues in your pull request or commit messages, see

  9. Celebrate!

Initial build configuration

Add Google Maps API Key(s)

If you do not have them, generate release and debug Google Maps API keys by following the instructions at:

In gnd/src/debug/res/values and gnd/src/release/res/values create google_maps_api.xml with the following contents:

<resources><string name="google_maps_key" templateMergeStrategy="preserve" translatable="false">API_KEY</string></resources> 

In gnd/src/debug/res/values replace API_KEY with your Google Maps debug API key. In gnd/src/release/res/values replace API_KEY with your Google Maps release API key.

Verify the SHA-1 certificate fingerprint described in the API key generation instructions is registered with package name To check, visit

To view the SHA-1 of the debug key generated by Android Studio run:

$ keytool -list -v -keystore "$HOME/.android/debug.keystore" \ 
-alias androiddebugkey \ 
-storepass android -keypass android 

Set up Firebase

  1. Create a new Firebase project at:

  2. Save config file for Android app to gnd/google-services.json:

This includes the API key and URL for your new Firebase project.

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