Google sign-in for APK

Configure Google sign-in for Android APKs built with Rocket.new - set up Google Cloud Console and Supabase OAuth.

Configure Google Cloud Console and Supabase so Google sign-in works in your Android APK. This guide covers creating OAuth credentials, configuring Supabase, and updating your app configuration.

APK only: When Google auth is configured through Supabase, Google sign-in will not work in Rocket’s preview or in published web apps. It will only work in a downloaded APK installed on a real device or emulator.

Your SHA-1 Certificate Fingerprint

Rocket generates a unique SHA-1 fingerprint for your app. You will need it in Step 1c below.

To find it:

1. In your Rocket project, click Launch in the top-right corner.
2. Click the APK tab.
3. Your SHA-1 key is shown at the top of the tab. Click the copy icon next to it.

Use copy-paste only - do not type this manually. A single wrong character will prevent users from signing in.

Step 1 - Google Cloud Console

1a. Create or select your project

1. Open Google Cloud Console

   1. Go to console.cloud.google.com and sign in.
   2. Click the project selector at the top of the page.
   3. Select your existing project, or click New Project, give it a name, and click Create.

1b. Set up the OAuth Consent Screen

This is the screen your users see when Google asks for permission to share their account details with your app.

1. Configure the consent screen

   1. In the sidebar, go to APIs & Services > OAuth consent screen and click Get Started.
   2. Fill in App name and User support email, then click Next.
   3. Select External and click Next.
   4. Fill in your Developer contact email and click Next.
   5. Click Create.

   Leave the app in Testing mode for now. Add your own Google account as a test user so you can sign in during testing.

1c. Create the Android OAuth Client ID

This credential identifies your app to Google during sign-in.

1. Create the Android credential

   1. Go to APIs & Services > Credentials and click + Create Credentials > OAuth client ID.
   2. Set Application type to Android.
   3. Fill in the following:

   Field	Value
   Name	e.g. MyApp Android
   Package name	Copy the namespace value from android/app/build.gradle.kts in your project (e.g. com.example.zebralover)
   SHA-1 certificate fingerprint	Paste the value you copied from Rocket’s Launch tab (see above)

   4. Click Create, then OK.

1d. Create the Web OAuth Client ID

Supabase requires a separate Web Client ID to handle authentication on your behalf.

1. Create the Web credential

   1. Click + Create Credentials > OAuth client ID again.
   2. Set Application type to Web application.
   3. Name it e.g. MyApp Web (Supabase).
   4. Under Authorised redirect URIs, click + Add URI and enter:

   https://<your-project-ref>.supabase.co/auth/v1/callback
   

   Replace <your-project-ref> including < and > with your Project ID, found in Supabase under Settings > General.

   5. Click Create.
   6. A dialog shows your Client ID and Client Secret. Copy and save both values - you will need them in Step 2.

   Keep your Client Secret private. Never share it publicly or include it in your app’s code.

Step 2 - Configure Supabase

2a. Enable Google Sign-In

1. Turn on the Google provider

   1. Log in to supabase.com and open your project.
   2. Go to Authentication > Providers in the sidebar.
   3. Find Google, click to expand it, and toggle Enable sign in with Google to ON.
   4. Paste the Web Client ID and Client Secret you saved in Step 1d.
   5. Click Save.

2b. Add the redirect URL

1. Add the deep-link redirect

   1. In the sidebar, go to Authentication > URL Configuration.
   2. Under Redirect URLs, click Add URL and enter:

   com.yourcompany.appname://login-callback
   

   Replace com.yourcompany.appname with your namespace value from android/app/build.gradle.kts.

   3. Click Save.

Step 3 - Update Your App Configuration

In Rocket, open Code and find env.json in the root folder of your project. Find the GOOGLE_WEB_CLIENT_ID field and replace the placeholder with the Web Client ID you copied in Step 1d.

{
    "SUPABASE_URL": "...",
    "SUPABASE_ANON_KEY": "...",
    "OPENAI_API_KEY": "...",
    "GEMINI_API_KEY": "...",
    "ANTHROPIC_API_KEY": "...",
    "PERPLEXITY_API_KEY": "...",
    "GOOGLE_WEB_CLIENT_ID": "your_google_web_client_id"
}

Paste the Web Client ID exactly as copied from the Step 1d dialog. It ends with .apps.googleusercontent.com.

You Are All Set

Go back to Rocket, click Build APK, and download your APK once the build is complete.

Google sign-in is ready

Google Cloud Console, Supabase, and your app are configured. Google sign-in will now work in your APK.