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Android 12 provides new APIs to improve our applications’ biometric authentication user experience.

BiometricManager.Strings class added to the BiometricManager which has 3 methods that expose the String values that we can use for prompt message, button label, and settings label.

Methods
  1. getButtonLabel(): returns a localized string that can be used as the text of a view that invokes BiometricPrompt(e.g button’s text)

 

Button’s text

 

  • getPromptMessage(): returns a localized string that can be shown while the user is authenticating with BiometricPrompt.
  • getSettingName(): returns a localized string that can be shown as the textfor an app setting that enables authentication with BiometricPrompt(e.g switch’s text).

 

 

All the methods may return null if none of the requested authenticator types are available.

Returned strings depend on which authentication methods are available on the device:

Results from Samsung S21 Ultra
When user has only face id:
[Use Face Unlock,
Use your face to continue,
Use biometrics]
When user has only fingerprint:
[Use fingerprint,
Use your fingerprint to continue,
Use biometrics]
When user has both face id and fingerprint:
[Use biometrics,
Use your biometric to continue,
Use biometrics]

Messages based on the authentication modes

 

Implementation 🧑‍💻
  • Add biometric permission in AndroidManifest.xml
<uses-permission android:name="android.permission.USE_BIOMETRIC"/>

AndroidManifest.xml

 

  • Add Androidx’s biometric library dependency inbuild.gradle(app)
implementation "androidx.biometric:biometric:1.1.0"

build.gradle (app level)

 

  • Finally, add the following code in Activity/Fragment
val biometricManager = BiometricManager.from(this)
var result = listOf<String?>()
if (biometricManager.canAuthenticate(BIOMETRIC_STRONG) == BiometricManager.BIOMETRIC_SUCCESS) {
when {
Build.VERSION.SDK_INT >= Build.VERSION_CODES.S -> {
val bioMetricHardwareManager = (applicationContext.getSystemService(Context.BIOMETRIC_SERVICE) as? android.hardware.biometrics.BiometricManager)
bioMetricHardwareManager?.getStrings(Authenticators.BIOMETRIC_WEAK or Authenticators.BIOMETRIC_STRONG)
?.run {
result = listOf(
buttonLabel?.toString(),
promptMessage?.toString(),
settingName?.toString()
)
}
}
else -> {
// NOT_AVAILABLE_FOR <API 12
}
}
}

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Jobs

  • We need to have an instance of BiometricManager to check if biometrics is available or not (line3 in the above gist file)
  • After getting the true result from canAuthenticate() method we can move forward and create an instance of android.hardware.biometrics.BiometricManager
  • Access the getStrings() method and access all the methods to get the localized string values.
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This article was originally published on proandroiddev.com on April 15, 2022

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