# BiometricManager.Strings

Added in [API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)

# Strings

*** ** * ** ***

Kotlin \|[Java](https://developer.android.com/reference/android/hardware/biometrics/BiometricManager.Strings "View this page in Java")  

```
open class Strings
```

|---|--------------------------------------------------------------------------------------------------------------------------------------------------------------|
| [kotlin.Any](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html)                                                                               ||
| ↳ | [android.hardware.biometrics.BiometricManager.Strings](https://developer.android.com/reference/kotlin/android/hardware/biometrics/BiometricManager.Strings#) |

Provides localized strings for an application that uses [BiometricPrompt](https://developer.android.com/reference/kotlin/android/hardware/biometrics/BiometricPrompt) to authenticate the user.

## Summary

|                                                                                                                                                                                                                                Public methods                                                                                                                                                                                                                                 ||
|-----------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| open [CharSequence](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-char-sequence/index.html)? | [getButtonLabel](https://developer.android.com/reference/kotlin/android/hardware/biometrics/BiometricManager.Strings#getButtonLabel())`()` Provides a localized string that can be used as the label for a button that invokes [BiometricPrompt](https://developer.android.com/reference/kotlin/android/hardware/biometrics/BiometricPrompt).                            |
| open [CharSequence](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-char-sequence/index.html)? | [getPromptMessage](https://developer.android.com/reference/kotlin/android/hardware/biometrics/BiometricManager.Strings#getPromptMessage())`()` Provides a localized string that can be shown while the user is authenticating with [BiometricPrompt](https://developer.android.com/reference/kotlin/android/hardware/biometrics/BiometricPrompt).                        |
| open [CharSequence](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-char-sequence/index.html)? | [getSettingName](https://developer.android.com/reference/kotlin/android/hardware/biometrics/BiometricManager.Strings#getSettingName())`()` Provides a localized string that can be shown as the title for an app setting that enables authentication with [BiometricPrompt](https://developer.android.com/reference/kotlin/android/hardware/biometrics/BiometricPrompt). |

## Public methods

### getButtonLabel

Added in [API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)  

```
open fun getButtonLabel(): CharSequence?
```

Provides a localized string that can be used as the label for a button that invokes [BiometricPrompt](https://developer.android.com/reference/kotlin/android/hardware/biometrics/BiometricPrompt).

When possible, this method should use the given authenticator requirements to more precisely specify the authentication type that will be used. For example, if **Class 3** biometric authentication is requested on a device with a **Class 3** fingerprint sensor and a **Class 2** face sensor, the returned string should indicate that fingerprint authentication will be used.

This method should also try to specify which authentication method(s) will be used in practice when multiple authenticators meet the given requirements. For example, if biometric authentication is requested on a device with both face and fingerprint sensors but the user has selected face as their preferred method, the returned string should indicate that face authentication will be used.

This method may return `null` if none of the requested authenticator types are available, but this should *not* be relied upon for checking the status of authenticators. Instead, use [canAuthenticate(int)](https://developer.android.com/reference/kotlin/android/hardware/biometrics/BiometricManager#canAuthenticate(kotlin.Int)).   
Requires [android.Manifest.permission#USE_BIOMETRIC](https://developer.android.com/reference/kotlin/android/Manifest.permission.html#USE_BIOMETRIC:kotlin.String)

|                                                                                                                                Return                                                                                                                                 ||
|------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| [CharSequence](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-char-sequence/index.html)? | The label for a button that invokes [BiometricPrompt](https://developer.android.com/reference/kotlin/android/hardware/biometrics/BiometricPrompt) for authentication. |

### getPromptMessage

Added in [API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)  

```
open fun getPromptMessage(): CharSequence?
```

Provides a localized string that can be shown while the user is authenticating with [BiometricPrompt](https://developer.android.com/reference/kotlin/android/hardware/biometrics/BiometricPrompt).

When possible, this method should use the given authenticator requirements to more precisely specify the authentication type that will be used. For example, if **Class 3** biometric authentication is requested on a device with a **Class 3** fingerprint sensor and a **Class 2** face sensor, the returned string should indicate that fingerprint authentication will be used.

This method should also try to specify which authentication method(s) will be used in practice when multiple authenticators meet the given requirements. For example, if biometric authentication is requested on a device with both face and fingerprint sensors but the user has selected face as their preferred method, the returned string should indicate that face authentication will be used.

This method may return `null` if none of the requested authenticator types are available, but this should *not* be relied upon for checking the status of authenticators. Instead, use [canAuthenticate(int)](https://developer.android.com/reference/kotlin/android/hardware/biometrics/BiometricManager#canAuthenticate(kotlin.Int)).   
Requires [android.Manifest.permission#USE_BIOMETRIC](https://developer.android.com/reference/kotlin/android/Manifest.permission.html#USE_BIOMETRIC:kotlin.String)

|                                                                                                                                Return                                                                                                                                 ||
|------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| [CharSequence](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-char-sequence/index.html)? | The label for a button that invokes [BiometricPrompt](https://developer.android.com/reference/kotlin/android/hardware/biometrics/BiometricPrompt) for authentication. |

### getSettingName

Added in [API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)  

```
open fun getSettingName(): CharSequence?
```

Provides a localized string that can be shown as the title for an app setting that enables authentication with [BiometricPrompt](https://developer.android.com/reference/kotlin/android/hardware/biometrics/BiometricPrompt).

When possible, this method should use the given authenticator requirements to more precisely specify the authentication type that will be used. For example, if **Class 3** biometric authentication is requested on a device with a **Class 3** fingerprint sensor and a **Class 2** face sensor, the returned string should indicate that fingerprint authentication will be used.

This method should *not* try to specify which authentication method(s) will be used in practice when multiple authenticators meet the given requirements. For example, if biometric authentication is requested on a device with both face and fingerprint sensors, the returned string should indicate that either face or fingerprint authentication may be used, regardless of whether the user has enrolled or selected either as their preferred method.

This method may return `null` if none of the requested authenticator types are supported by the system, but this should *not* be relied upon for checking the status of authenticators. Instead, use [canAuthenticate(int)](https://developer.android.com/reference/kotlin/android/hardware/biometrics/BiometricManager#canAuthenticate(kotlin.Int)) or [android.content.pm.PackageManager#hasSystemFeature(String)](https://developer.android.com/reference/kotlin/android/content/pm/PackageManager.html#hasSystemFeature(kotlin.String)).   
Requires [android.Manifest.permission#USE_BIOMETRIC](https://developer.android.com/reference/kotlin/android/Manifest.permission.html#USE_BIOMETRIC:kotlin.String)

|                                                                                                                                Return                                                                                                                                 ||
|------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| [CharSequence](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-char-sequence/index.html)? | The label for a button that invokes [BiometricPrompt](https://developer.android.com/reference/kotlin/android/hardware/biometrics/BiometricPrompt) for authentication. |