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android-solana-example

README.md

MetaMask Embedded Wallets — Android Solana Example

Android example demonstrating Solana blockchain integration with MetaMask Embedded Wallets (formerly Web3Auth Plug and Play). Built with Jetpack Compose, Koin, and sol4k.

Features

  • Social login via Google (using grouped connection)
  • Solana wallet creation via Ed25519 private key derivation
  • Get Solana wallet address (public key) and devnet SOL balance
  • Send SOL transactions on Solana Devnet
  • Session persistence across app restarts
  • MVVM architecture with Jetpack Compose UI

Requirements

Setup

1. Clone the repository

git clone https://github.com/Web3Auth/web3auth-android-examples.git
cd web3auth-android-examples/android-solana-example

2. Configure the Web3Auth Dashboard

  1. Create a project on the Embedded Wallets Dashboard.
  2. Set up a Google connection and note your Auth Connection ID and Grouped Auth Connection ID.
  3. Allowlist your redirect URI: com.example.androidsolanaexample://auth

3. Update Web3AuthSampleConfig.kt

object Web3AuthSampleConfig {
    const val CLIENT_ID = "YOUR_WEB3AUTH_CLIENT_ID"
    const val REDIRECT_URL = "com.example.androidsolanaexample://auth"
    const val GOOGLE_AUTH_CONNECTION_ID = "YOUR_GOOGLE_AUTH_CONNECTION_ID"
    const val GOOGLE_CLIENT_ID = "YOUR_GOOGLE_CLIENT_ID"
    const val GROUPED_AUTH_CONNECTION_ID = "YOUR_GROUPED_AUTH_CONNECTION_ID"
}

4. Open in Android Studio and run

How It Works

Key dependencies (app/build.gradle.kts)

dependencies {
    implementation("com.github.web3auth:web3auth-android-sdk:10.0.1")
    implementation("org.sol4k:sol4k:0.4.1")
    implementation("io.insert-koin:koin-android:3.5.3")
}

Initialize Web3Auth

The SDK is initialized in the Koin module and the activity calls initialize() via the ViewModel:

// Login
val loginParams = LoginParams(
    authConnection = AuthConnection.GOOGLE,
    authConnectionId = Web3AuthSampleConfig.GOOGLE_AUTH_CONNECTION_ID,
    groupedAuthConnectionId = Web3AuthSampleConfig.GROUPED_AUTH_CONNECTION_ID
)
web3Auth.connectTo(loginParams).await()

Derive the Solana keypair

After login, use getEd25519PrivateKey() to get the Solana private key:

val ed25519PrivateKey = web3Auth.getEd25519PrivateKey()
val solanaKeyPair = Keypair.fromSecretKey(ed25519PrivateKey.hexToByteArray())
val publicKey = solanaKeyPair.publicKey.toBase58()

Get Solana balance

val connection = Connection(RpcUrl.DEVNET)
val balance = connection.getBalance(solanaKeyPair.publicKey)

Handle deep link callbacks

override fun onNewIntent(intent: Intent?) {
    super.onNewIntent(intent)
    web3Auth.setResultUrl(intent?.data)
}

override fun onResume() {
    super.onResume()
    if (Web3Auth.getCustomTabsClosed()) {
        web3Auth.setResultUrl(null)
        Web3Auth.setCustomTabsClosed(false)
    }
}

Resources

License

MIT — see LICENSE for details.