Android Development

// Phone Number Hint API example
private fun requestHint() {
    val hintRequest = HintRequest.Builder()
        .setPhoneNumberIdentifierSupported(true)
        .build()
    
    val intent = Credentials.getClient(this).getHintPickerIntent(hintRequest)
    startIntentSenderForResult(intent.intentSender, RESOLVE_HINT, null, 0, 0, 0)
}

// Biometric Authentication
private fun showBiometricPrompt() {
    val biometricPrompt = BiometricPrompt(this, ContextCompat.getMainExecutor(this),
        object : BiometricPrompt.AuthenticationCallback() {
            override fun onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult) {
                super.onAuthenticationSucceeded(result)
                // Authentication succeeded
            }
        })
    
    val promptInfo = BiometricPrompt.PromptInfo.Builder()
        .setTitle("Biometric Authentication")
        .setSubtitle("Log in using your biometric credential")
        .setNegativeButtonText("Cancel")
        .build()
    
    biometricPrompt.authenticate(promptInfo)
}

// Permission Request (Modern approach)
private val requestPermissionLauncher = registerForActivityResult(
    ActivityResultContracts.RequestPermission()
) { isGranted: Boolean ->
    if (isGranted) {
        // Permission granted
    } else {
        // Permission denied
    }
}

// Usage
requestPermissionLauncher.launch(Manifest.permission.CAMERA)