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.

FirebaseOptions.Builder

class FirebaseOptions.Builder

Builder for constructing FirebaseOptions.

Summary

Public constructors
`Builder()` Constructs an empty builder.
`Builder(options: FirebaseOptions)` Initializes the builder's values from the options object.

Public functions
`FirebaseOptions`	`build()`
`FirebaseOptions.Builder`	`setApiKey(apiKey: String)`
`FirebaseOptions.Builder`	`setApplicationId(applicationId: String)`
`FirebaseOptions.Builder`	`setDatabaseUrl(databaseUrl: String?)`
`FirebaseOptions.Builder`	`setGcmSenderId(gcmSenderId: String?)`
`FirebaseOptions.Builder`	`setProjectId(projectId: String?)`
`FirebaseOptions.Builder`	`setStorageBucket(storageBucket: String?)`

Public constructors

Builder

Builder()

Constructs an empty builder.

Builder

Builder(options: FirebaseOptions)

Initializes the builder's values from the options object.

The new builder is not backed by this objects values, that is changes made to the new builder don't change the values of the origin object.

Public functions

build

fun build(): FirebaseOptions

setApiKey

fun setApiKey(apiKey: String): FirebaseOptions.Builder

setApplicationId

fun setApplicationId(applicationId: String): FirebaseOptions.Builder

setDatabaseUrl

fun setDatabaseUrl(databaseUrl: String?): FirebaseOptions.Builder

setGcmSenderId

fun setGcmSenderId(gcmSenderId: String?): FirebaseOptions.Builder

setProjectId

fun setProjectId(projectId: String?): FirebaseOptions.Builder

setStorageBucket

fun setStorageBucket(storageBucket: String?): FirebaseOptions.Builder