# KnownExtensions

Artifact: [androidx.credentials.providerevents:providerevents](https://developer.android.com/jetpack/androidx/releases/credentials-providerevents) [View Source](https://cs.android.com/search?q=file:androidx/credentials/providerevents/transfer/KnownExtensions.kt+class:androidx.credentials.providerevents.transfer.KnownExtensions) Added in [1.0.0-beta01](https://developer.android.com/jetpack/androidx/releases/credentials-providerevents#1.0.0-beta01)

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```
public static class KnownExtensions
```

<br />

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The known extensions that can be transferred as part of the FIDO Credential Exchange Format (CXF). More about these types can found [here](https://fidoalliance.org/specs/cx/cxf-v1.0-ps-20250814.html#sctn-iana-extension-registry). The constants defined in this class list the frequently used extensions in CXF, and are not intended to be the exhaustive list.

## Summary

| ### Constants |
|---|---|
| `static final @https://developer.android.com/reference/androidx/annotation/NonNull https://developer.android.com/reference/java/lang/String.html` | `https://developer.android.com/reference/androidx/credentials/providerevents/transfer/KnownExtensions#KNOWN_EXTENSION_SHARED()` An extension defining how an entity is shared across user accounts. |

| ### Public fields |
|---|---|
| `static @https://developer.android.com/reference/androidx/annotation/NonNull https://developer.android.com/reference/androidx/credentials/providerevents/transfer/KnownExtensions` | `https://developer.android.com/reference/androidx/credentials/providerevents/transfer/KnownExtensions#INSTANCE()` |

## Constants

### KNOWN_EXTENSION_SHARED

Added in [1.0.0-beta01](https://developer.android.com/jetpack/androidx/releases/credentials-providerevents#1.0.0-beta01)

```
public static final @NonNull String KNOWN_EXTENSION_SHARED
```

An extension defining how an entity is shared across user accounts.

## Public fields

### INSTANCE

Added in [1.0.0-beta01](https://developer.android.com/jetpack/androidx/releases/credentials-providerevents#1.0.0-beta01)

```
public static @NonNull KnownExtensions INSTANCE
```