IMPORTANT: In July 2025, we stopped releasing new versions of KTX modules, and we removed the KTX libraries from the Firebase Android BoM (v34.0.0). If you use KTX APIs from the previously released KTX modules, we recommend that you migrate your app to use KTX APIs from the main modules instead. For details, see the FAQ about this initiative.

com.google.firebase.crashlytics

Classes

`CustomKeysAndValues`	Helper class which handles the storage and conversion to strings of key/value pairs with heterogeneous value types.
`CustomKeysAndValues.Builder`
`FirebaseCrashlytics`	The Firebase Crashlytics API provides methods to annotate and manage fatal crashes, non-fatal errors, and ANRs captured and reported to Firebase Crashlytics.
`KeyValueBuilder`	Helper class to enable convenient syntax in `setCustomKeys` and `recordException`

Extension functions summary

`Unit`	`FirebaseCrashlytics.recordException( throwable: Throwable, init: KeyValueBuilder.() -> Unit )` Records a non-fatal report to send to Crashlytics with additional custom keys
`Unit`	`FirebaseCrashlytics.setCustomKeys(init: KeyValueBuilder.() -> Unit)` Associates all key-value parameters with the reports

Extension properties summary

FirebaseCrashlytics

Firebase.crashlytics

Returns the FirebaseCrashlytics instance of the default FirebaseApp.

Extension functions

recordException

fun FirebaseCrashlytics.recordException(
    throwable: Throwable,
    init: KeyValueBuilder.() -> Unit
): Unit

Records a non-fatal report to send to Crashlytics with additional custom keys

setCustomKeys

fun FirebaseCrashlytics.setCustomKeys(init: KeyValueBuilder.() -> Unit): Unit

Associates all key-value parameters with the reports

Extension properties

crashlytics

val Firebase.crashlytics: FirebaseCrashlytics

Returns the FirebaseCrashlytics instance of the default FirebaseApp.