Auth0 Android Integration

Add authentication to Android applications using com.auth0.android:auth0.

Agent instruction: Before providing SDK setup instructions, fetch the latest release version by running:

gh api repos/auth0/Auth0.Android/releases/latest --jq '.tag_name'

Use the returned version in all implementation dependency lines instead of any hardcoded version below. If the command fails, fall back to checking https://github.com/auth0/Auth0.Android/releases.

Prerequisites

• Android API 21 or higher
• Kotlin or Java project
• Auth0 account with a Native application configured
• If you don't have Auth0 set up, see auth0-quickstart

When NOT to Use

• React Native apps: Use auth0-react-native
• Flutter apps: Use the native Flutter Auth0 SDK
• Web SPAs (React, Angular, Vue): Use auth0-react, auth0-angular, or auth0-vue
• Node.js/Express servers: Use auth0-express
• iOS/macOS apps: Use auth0-swift

Quick Start Workflow

1. Install SDK: Add the Auth0 Android SDK dependency to your build.gradle:

   implementation 'com.auth0.android:auth0:{LATEST_VERSION}'
   

2. Configure Auth0:

   See Setup Guide for automatic/manual setup, post-setup required project changes, and callback URL configuration.

3. Initialize: Create an Auth0 account instance:

   import com.auth0.android.Auth0
   
   val account = Auth0.getInstance(context)
   

4. Add Auth UI: Implement login and logout with Web Auth:

   Agent instruction: Before adding new UI elements, search the project for existing click handlers for login, logout, sign-in, or sign-out buttons (e.g., loginButton, signInButton, logoutButton, signOutButton, or setOnClickListener with auth-related naming). If existing handlers are found, hook the Auth0 code into them without modifying the existing UI. Only create new buttons if no existing handlers are found.

   Login:

   import com.auth0.android.Auth0
   import com.auth0.android.authentication.AuthenticationAPIClient
   import com.auth0.android.authentication.storage.SecureCredentialsManager
   import com.auth0.android.authentication.storage.SharedPreferencesStorage
   import com.auth0.android.callback.Callback
   import com.auth0.android.authentication.AuthenticationException
   import com.auth0.android.provider.WebAuthProvider
   import com.auth0.android.result.Credentials
   
   val account = Auth0.getInstance(context)
   val authentication = AuthenticationAPIClient(account)
   val storage = SharedPreferencesStorage(context)
   val credentialsManager = SecureCredentialsManager(context, authentication, storage)
   
   WebAuthProvider.login(account)
       .withScheme(getString(R.string.com_auth0_scheme))
       .withScope("openid profile email offline_access")
       .start(this, object : Callback<Credentials, AuthenticationException> {
           override fun onSuccess(result: Credentials) {
               // User authenticated
               val idToken = result.idToken
               val accessToken = result.accessToken
               // Store credentials securely
               credentialsManager.saveCredentials(result)
           }
           override fun onFailure(error: AuthenticationException) {
               // Handle authentication failure
               Log.e("Auth0", "Authentication failed", error)
           }
       })
   

   Logout:

   WebAuthProvider.logout(account)
       .withScheme(getString(R.string.com_auth0_scheme))
       .start(this, object : Callback<Void?, AuthenticationException> {
           override fun onSuccess(result: Void) {
               // User logged out
           }
           override fun onFailure(error: AuthenticationException) {
               Log.e("Auth0", "Logout failed", error)
           }
       })
   

5. Build & Verify:

   Agent instruction: After completing the integration, build the project to verify it compiles successfully:

   ./gradlew assembleDebug
   

   If the build fails, analyze the error output and fix the issues. Common integration build failures include:

   • Unresolved reference: Missing import statements — add the required import com.auth0.android.* imports
   • Cannot resolve symbol R.string.com_auth0_scheme: strings.xml not updated — verify com_auth0_scheme, com_auth0_client_id, and com_auth0_domain entries exist
   • Incompatible types in callback: Callback type parameters don't match — ensure Callback<Credentials, AuthenticationException> for login and Callback<Void?, AuthenticationException> for logout
   • Unresolved lifecycleScope: Missing dependency — add implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.6.+' or move code out of coroutine scope
   • minSdk too low: SDK requires API 21+ — update minSdkVersion to at least 21
   • Java version mismatch: SDK requires Java 8 — add compileOptions with JavaVersion.VERSION_1_8

   Re-run the build after each fix. Track the number of build-fix iterations.

   Failcheck: If the build still fails after 5–6 fix attempts, stop and ask the user using AskUserQuestion: "The build is still failing after several fix attempts. How would you like to proceed?"

   • Let the skill continue fixing iteratively — continue the build-fix loop for another 5–6 attempts
   • Fix it manually — show the remaining errors and let the user resolve them
   • Skip build verification — proceed without a successful build

   Repeat this check after every 5–6 iterations if errors persist. Do not leave the project in a non-compiling state without the user's explicit consent.

   The callback URL must match your Auth0 application settings: {SCHEME}://{YOUR_AUTH0_DOMAIN}/android/{YOUR_APP_PACKAGE_NAME}/callback

Detailed Documentation

• Setup Guide — Install SDK, configure Auth0 application, set up callback URLs, Android App Links, custom schemes, ProGuard/R8
• Integration Patterns — Web Auth login/logout, credential storage, biometric authentication, database login, passwordless authentication, MFA handling, custom tabs, error handling
• Testing & Reference — Testing checklist, common issues, security considerations, API reference

Common Mistakes

Related Skills

• auth0-quickstart — Set up an Auth0 account and application
• auth0-mfa — Configure multi-factor authentication
• auth0-swift — iOS/macOS authentication

Quick Reference

Core Classes

Common Use Cases

• Log in with Web Auth
• Log out
• Store credentials securely
• Require biometric authentication
• Database login
• Passwordless authentication
• Handle MFA
• Call protected APIs

References

• Auth0 Android SDK Documentation
• Auth0 Android GitHub Repository
• Android SDK Javadoc
• Auth0 Android Quickstart
• Sample App