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.

ImagenGenerationConfig.Builder

class ImagenGenerationConfig.Builder

Builder for creating a ImagenGenerationConfig.

This is mainly intended for Java interop. For Kotlin, use imagenGenerationConfig for a more idiomatic experience.

Deprecation Notice: All Imagen models are deprecated and will shut down as early as June 2026. As a replacement, you can migrate your apps to use Gemini Image models (the 'Nano Banana' models)

Summary

Public constructors
`Builder()`

Public functions
`ImagenGenerationConfig`	`build()` This function is deprecated. All Imagen models are deprecated.
`ImagenGenerationConfig.Builder`	`setAddWatermark(addWatermark: Boolean)` This function is deprecated. All Imagen models are deprecated.
`ImagenGenerationConfig.Builder`	`setAspectRatio(aspectRatio: ImagenAspectRatio)` This function is deprecated. All Imagen models are deprecated.
`ImagenGenerationConfig.Builder`	`setImageFormat(imageFormat: ImagenImageFormat)` This function is deprecated. All Imagen models are deprecated.
`ImagenGenerationConfig.Builder`	`setNegativePrompt(negativePrompt: String)` This function is deprecated. All Imagen models are deprecated.
`ImagenGenerationConfig.Builder`	`setNumberOfImages(numberOfImages: Int)` This function is deprecated. All Imagen models are deprecated.

Public properties
`Boolean?`	`addWatermark`
`ImagenAspectRatio?`	`aspectRatio`
`ImagenImageFormat?`	`imageFormat`
`String?`	`negativePrompt`
`Int?`	`numberOfImages`

Public constructors

Builder

Builder()

Public functions

build

fun build(): ImagenGenerationConfig

Alternative casing for ImagenGenerationConfig.Builder:

val config = GenerationConfig.builder()

Deprecation Notice: All Imagen models are deprecated and will shut down as early as June 2026. As a replacement, you can migrate your apps to use Gemini Image models (the 'Nano Banana' models)

setAddWatermark

fun setAddWatermark(addWatermark: Boolean): ImagenGenerationConfig.Builder

See ImagenGenerationConfig.addWatermark.

Deprecation Notice: All Imagen models are deprecated and will shut down as early as June 2026. As a replacement, you can migrate your apps to use Gemini Image models (the 'Nano Banana' models)

setAspectRatio

fun setAspectRatio(aspectRatio: ImagenAspectRatio): ImagenGenerationConfig.Builder

See ImagenGenerationConfig.aspectRatio.

Deprecation Notice: All Imagen models are deprecated and will shut down as early as June 2026. As a replacement, you can migrate your apps to use Gemini Image models (the 'Nano Banana' models)

setImageFormat

fun setImageFormat(imageFormat: ImagenImageFormat): ImagenGenerationConfig.Builder

See ImagenGenerationConfig.imageFormat.

Deprecation Notice: All Imagen models are deprecated and will shut down as early as June 2026. As a replacement, you can migrate your apps to use Gemini Image models (the 'Nano Banana' models)

setNegativePrompt

fun setNegativePrompt(negativePrompt: String): ImagenGenerationConfig.Builder

See ImagenGenerationConfig.negativePrompt.

Deprecation Notice: All Imagen models are deprecated and will shut down as early as June 2026. As a replacement, you can migrate your apps to use Gemini Image models (the 'Nano Banana' models)

setNumberOfImages

fun setNumberOfImages(numberOfImages: Int): ImagenGenerationConfig.Builder

See ImagenGenerationConfig.numberOfImages.

Deprecation Notice: All Imagen models are deprecated and will shut down as early as June 2026. As a replacement, you can migrate your apps to use Gemini Image models (the 'Nano Banana' models)

Public properties

addWatermark

var addWatermark: Boolean?

aspectRatio

var aspectRatio: ImagenAspectRatio?

imageFormat

var imageFormat: ImagenImageFormat?

negativePrompt

var negativePrompt: String?

numberOfImages

var numberOfImages: Int?