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

public final class FirebaseOptions.Builder

Builder for constructing FirebaseOptions.

Summary

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

Public methods
`@NonNull FirebaseOptions`	`build()`
`@NonNull FirebaseOptions.Builder`	`setApiKey(@NonNull String apiKey)`
`@NonNull FirebaseOptions.Builder`	`setApplicationId(@NonNull String applicationId)`
`@NonNull FirebaseOptions.Builder`	`setDatabaseUrl(@Nullable String databaseUrl)`
`@NonNull FirebaseOptions.Builder`	`setGcmSenderId(@Nullable String gcmSenderId)`
`@NonNull FirebaseOptions.Builder`	`setProjectId(@Nullable String projectId)`
`@NonNull FirebaseOptions.Builder`	`setStorageBucket(@Nullable String storageBucket)`

Public constructors

Builder

public Builder()

Constructs an empty builder.

Builder

public Builder(@NonNull FirebaseOptions options)

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 methods

build

public @NonNull FirebaseOptions build()

setApiKey

public @NonNull FirebaseOptions.Builder setApiKey(@NonNull String apiKey)

setApplicationId

public @NonNull FirebaseOptions.Builder setApplicationId(@NonNull String applicationId)

setDatabaseUrl

public @NonNull FirebaseOptions.Builder setDatabaseUrl(@Nullable String databaseUrl)

setGcmSenderId

public @NonNull FirebaseOptions.Builder setGcmSenderId(@Nullable String gcmSenderId)

setProjectId

public @NonNull FirebaseOptions.Builder setProjectId(@Nullable String projectId)

setStorageBucket

public @NonNull FirebaseOptions.Builder setStorageBucket(@Nullable String storageBucket)