LogoLogo
SupportGithubSign InGet Access
  • Introduction
  • GETTING STARTED
    • SDK Quick Start
    • API Quick Start
  • Guides
    • Web
      • Create a wallet
      • Send tokens
      • Sign a transaction
      • Simulate a transaction
      • Back up a wallet
      • Recover a wallet
      • Cross-device sessions
      • Manage wallet lifecycle states
      • Web authentication methods
      • Perform swaps
      • Add custom signature hooks
      • MPC progress callbacks
      • Portal API methods
      • Configure a custom subdomain
      • Eject a wallet
      • Using the EIP-1193 Provider
      • Legacy documentation
        • Back up a wallet
          • Backup Options
        • Recover a wallet
    • iOS
      • Create a wallet
      • Send tokens
      • Sign a transaction
      • Simulate a transaction
      • Back up a wallet
      • Recover a wallet
      • Cross-device sessions
      • Manage wallet lifecycle states
      • Connect with WalletConnect
      • Build a WebView
      • Perform swaps
      • Add custom signature hooks
      • MPC progress callbacks
      • Portal API methods
      • Manage ERC20 tokens
      • Eject a wallet
      • Legacy documentation
        • Back up a wallet
          • Backup Options
          • Passkey + Enclave Storage
        • Recover a wallet
      • Troubleshooting Tips
      • Feature Flags
    • Android
      • Create a wallet
      • Send tokens
      • Sign a transaction
      • Simulate a transaction
      • Back up a wallet
      • Recover a wallet
      • Cross-device sessions
      • Manage wallet lifecycle states
      • Connect with WalletConnect
      • Build a WebView
      • Perform swaps
      • Add custom signature hooks
      • MPC progress callbacks
      • Portal API methods
      • Eject a wallet
      • Legacy documentation
        • Back up a wallet
          • Backup Options
        • Recover a wallet
    • React Native
      • Create a wallet
      • Send tokens
      • Sign a transaction
      • Simulate a transaction
      • Back up a wallet
      • Recover a wallet
      • Cross-device sessions
      • Manage wallet lifecycle states
      • Connect with WalletConnect
      • Build a WebView
      • Perform swaps
      • Add custom signature hooks
      • MPC progress callbacks
      • Portal API methods
      • Eject a wallet
      • Legacy documentation
        • Back up a wallet
          • Backup Options
        • Recover a wallet
    • Enclave MPC API
      • Create a client
      • Create a wallet
      • Send tokens
      • Sign Ethereum transactions
      • Sign Solana transactions
      • Sign Tron transactions
      • Sign Stellar Transaction
      • Concurrent Transactions
      • Back up a wallet
      • Eject a wallet
  • Reference
    • iOS
      • createWallet
      • backupWallet
      • recoverWallet
      • ejectPrivateKeys
      • registerBackupMethod
      • setGDriveConfiguration
      • setPasskeyConfiguration
      • setPasskeyAuthenticationAnchor
      • setPassword
      • availableRecoveryMethods
      • doesWalletExist
      • isWalletBackedUp
      • isWalletOnDevice
      • isWalletRecoverable
      • getBalances
      • getAssets
      • getNftAssets
      • getTransactions
      • sendSol
      • evaluateTransaction
      • buildEip155Transaction
      • buildSolanaTransaction
      • getWalletCapabilities
    • Android
      • Reference Documentation
    • React Native
      • @portal-hq/core
      • Storage adapters
        • Cloud storage
          • @portal-hq/gdrive-storage
          • @portal-hq/icloud-storage
        • Mobile storage
          • @portal-hq/keychain
          • @portal-hq/mobile-key-values
    • Enclave MPC API
      • V1 endpoints
    • Client API
      • V3 endpoints
      • V1 endpoints
    • Custodian API
      • V3 endpoints
      • V1 endpoints
    • Swaps API
      • V3 endpoints
      • V1 endpoints
  • Resources
    • Flutter
      • iOS
      • Android
    • Error codes
      • Overview
      • MPC errors
      • Network errors
      • General errors
      • Encryption errors
      • Portal Connect errors
    • Portal's MPC architecture
    • Authentication and API Keys
    • Self-Managed Backups
    • Alert Webhooks
    • Wallet lifecycle
    • Backup options
      • Password/PIN
      • GDrive
      • iCloud
      • Passkey + Enclave
    • WalletConnect metadata
    • Advanced security scanning
    • Account abstraction
    • Security firewall
    • Eject
    • Security
    • Blockchain support
    • Chain ID formatting
    • Testnet faucets
    • Going to Production
    • Rate Limits
    • Multi-backup migration guide
    • Multi-wallet migration guides
      • Migrating from Android SDK v3.x.x to v4.x.x
      • Migrating from iOS SDK v3.0.x to v3.2.x
  • Support
    • Changelog
      • Android
      • iOS
      • React Native
      • Web
      • Past Releases
        • 2024 Releases
        • 2023 Releases
    • Celo Hackathon Hub
    • Glossary
Powered by GitBook
On this page

Was this helpful?

  1. Guides
  2. Android

Cross-device sessions

Use wallet provisioning to enable your users to create multiple signing shares across their devices.

PreviousRecover a walletNextManage wallet lifecycle states

Last updated 4 months ago

Was this helpful?

Once users successfully back up their wallets, they can generate a new set of signing shares irrespective of the SDK in use. Furthermore, both the new and old sets of signing shares can be used simultaneously, thanks to portal.provisionWallet. This provisioning relies on the user already having a successful set of backup shares.

While provisioning, the wallet fetches the encryption key from the user's cloud storage provider to decrypt the encrypted client backup share. Note that our SDK handles the decryption; you only need to supply the encrypted client backup share.

For wallet provisioning support, consult to establish the necessary /backup/fetch webhook. Also, ensure the user has successfully completed the backup process.

Here's how to implement portal.provisionWallet:

// Imports...
import kotlinx.coroutines.*

class MainActivity : AppCompatActivity() {
  lateinit var portal: Portal
  lateinit var provisionButton: Button

  // Your API instance.
  private val exchangeApi: Api = Api()

  // The user from your API instance.
  lateinit var user: User

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    provisionButton = findViewById(R.id.provisionButton)
    provisionButton.setOnClickListener { handleProvision() }
  }

  private fun handleProvision() {
    lifecycleScope.launch {
      try {
        // Retrieve the existing encrypted client backup share from your API.
        val backupShare = exchangeApi.getCipherText(user.id)

        // Set a new signing share by running provisionWallet.
        portal.provisionWallet(backupShare) { status ->
          // Ensure UI interactions are done on the main thread
          // Do something with the status, such as update a progress bar
          // or log the progress
          Log.i("[PORTAL]", "Provision wallet status: ${status.status}, is done: ${status.done}")
        } 
      } catch (e: Exception) {
        // ❌ Handle any errors provisioning the wallet.
        Log.e("[PORTAL]", "Error provisioning wallet: ${e.message}")
      }
    }
  }
}

And that's it! You're now equipped to support multiple sessions across different devices for your users.

the recovery documentation