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[AI] Introduce OnDeviceExtension for GenerativeModel (#8086)
Adds `OnDeviceExtension` to `GenerativeModel` in `firebase-ai`, centralizing on-device model management. This extension provides methods for `checkStatus`, `download`, and `warmUp` for on-device models. This removes the need for `firebase-ai-ondevice` SDK to have a public API. Key changes include: * Defining: new `DownloadStatus` and `OnDeviceModelStatus` classes in `firebase-ai` for public consumption, marked as `PublicPreviewAPI`. * Creating: corresponding `DownloadStatusInterop` and `OnDeviceModelStatusInterop` classes in `firebase-ai-ondevice-interop` for internal interop with ML Kit. * Implementing: `checkStatus` and `download` on the `GenerativeModel` interop interface in `firebase-ai-ondevice`, utilizing ML Kit's APIs and new converter functions. * Deprecating: the old `FirebaseAIOnDevice.checkStatus`, `FirebaseAIOnDevice.download`, `DownloadStatus`, `OnDeviceModelStatus`, and `OnDeviceModelOption` in `firebase-ai-ondevice`. * Deprecating: the top-level `GenerativeModel.warmUp()` method in `firebase-ai` in favor of `onDeviceExtension?.warmUp()`. * Adding: new unit tests for the `OnDeviceExtension` functionality. --------- Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
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Lines changed: 518 additions & 86 deletions

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‎ai-logic/firebase-ai-ondevice-interop/api.txt‎

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@@ -15,6 +15,32 @@ package com.google.firebase.ai.ondevice.interop {
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property public final int totalTokens;
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}
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public class DownloadStatusInterop {
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ctor public DownloadStatusInterop();
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}
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public static final class DownloadStatusInterop.DownloadCompleted extends com.google.firebase.ai.ondevice.interop.DownloadStatusInterop {
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ctor public DownloadStatusInterop.DownloadCompleted();
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}
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public static final class DownloadStatusInterop.DownloadFailed extends com.google.firebase.ai.ondevice.interop.DownloadStatusInterop {
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ctor public DownloadStatusInterop.DownloadFailed(com.google.firebase.ai.ondevice.interop.FirebaseAIOnDeviceException exception);
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method public com.google.firebase.ai.ondevice.interop.FirebaseAIOnDeviceException getException();
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property public final com.google.firebase.ai.ondevice.interop.FirebaseAIOnDeviceException exception;
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}
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public static final class DownloadStatusInterop.DownloadInProgress extends com.google.firebase.ai.ondevice.interop.DownloadStatusInterop {
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ctor public DownloadStatusInterop.DownloadInProgress(long totalBytesDownloaded);
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method public long getTotalBytesDownloaded();
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property public final long totalBytesDownloaded;
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}
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public static final class DownloadStatusInterop.DownloadStarted extends com.google.firebase.ai.ondevice.interop.DownloadStatusInterop {
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ctor public DownloadStatusInterop.DownloadStarted(long bytesToDownload);
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method public long getBytesToDownload();
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property public final long bytesToDownload;
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}
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public final class FinishReason {
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method public String getName();
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property public final String name;
@@ -83,7 +109,9 @@ package com.google.firebase.ai.ondevice.interop {
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}
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public interface GenerativeModel {
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method public suspend Object? checkStatus(kotlin.coroutines.Continuation<? super com.google.firebase.ai.ondevice.interop.OnDeviceModelStatusInterop>);
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method public suspend Object? countTokens(com.google.firebase.ai.ondevice.interop.GenerateContentRequest request, kotlin.coroutines.Continuation<? super com.google.firebase.ai.ondevice.interop.CountTokensResponse>);
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method public kotlinx.coroutines.flow.Flow<com.google.firebase.ai.ondevice.interop.DownloadStatusInterop> download();
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method public suspend Object? generateContent(com.google.firebase.ai.ondevice.interop.GenerateContentRequest request, kotlin.coroutines.Continuation<? super com.google.firebase.ai.ondevice.interop.GenerateContentResponse>);
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method public kotlinx.coroutines.flow.Flow<com.google.firebase.ai.ondevice.interop.GenerateContentResponse> generateContentStream(com.google.firebase.ai.ondevice.interop.GenerateContentRequest request);
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method public suspend Object? getBaseModelName(kotlin.coroutines.Continuation<? super java.lang.String>);
@@ -116,6 +144,17 @@ package com.google.firebase.ai.ondevice.interop {
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enum_constant public static final com.google.firebase.ai.ondevice.interop.ModelReleaseStage STABLE;
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}
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public final class OnDeviceModelStatusInterop {
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field public static final com.google.firebase.ai.ondevice.interop.OnDeviceModelStatusInterop AVAILABLE;
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field public static final com.google.firebase.ai.ondevice.interop.OnDeviceModelStatusInterop.Companion Companion;
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field public static final com.google.firebase.ai.ondevice.interop.OnDeviceModelStatusInterop DOWNLOADABLE;
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field public static final com.google.firebase.ai.ondevice.interop.OnDeviceModelStatusInterop DOWNLOADING;
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field public static final com.google.firebase.ai.ondevice.interop.OnDeviceModelStatusInterop UNAVAILABLE;
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}
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public static final class OnDeviceModelStatusInterop.Companion {
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}
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public interface Part {
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}
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‎ai-logic/firebase-ai-ondevice-interop/src/main/kotlin/com/google/firebase/ai/ondevice/interop/DownloadStatusInterop.kt‎

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/*
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* Copyright 2026 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.firebase.ai.ondevice.interop
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/** Represents the status of a model download operation. */
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public open class DownloadStatusInterop {
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/**
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* Indicates that the download has started.
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*
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* @property bytesToDownload The total number of bytes that need to be downloaded.
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*/
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public class DownloadStarted(public val bytesToDownload: Long) : DownloadStatusInterop()
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/**
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* Indicates that the download is in progress.
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*
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* @property totalBytesDownloaded The total number of bytes downloaded so far.
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*/
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public class DownloadInProgress(public val totalBytesDownloaded: Long) : DownloadStatusInterop()
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/**
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* Indicates that the download has failed.
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*
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* @property exception The exception that caused the download to fail.
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*/
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public class DownloadFailed(public val exception: FirebaseAIOnDeviceException) :
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DownloadStatusInterop()
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/** Indicates that the download has completed successfully. */
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public class DownloadCompleted : DownloadStatusInterop()
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}

‎ai-logic/firebase-ai-ondevice-interop/src/main/kotlin/com/google/firebase/ai/ondevice/interop/GenerativeModel.kt‎

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@@ -86,4 +86,18 @@ public interface GenerativeModel {
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* @throws [FirebaseAIOnDeviceNotAvailableException] if model is not available.
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*/
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public suspend fun warmup()
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/**
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* Checks the current status / availability of the on-device AI model.
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*
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* @return An [OnDeviceModelStatusInterop] indicating the current state of the model.
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*/
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public suspend fun checkStatus(): OnDeviceModelStatusInterop
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/**
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* Initiates the download of the on-device AI model.
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*
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* @return A [Flow] of [DownloadStatusInterop] objects representing the download lifecycle.
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*/
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public fun download(): Flow<DownloadStatusInterop>
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}

‎ai-logic/firebase-ai-ondevice-interop/src/main/kotlin/com/google/firebase/ai/ondevice/interop/OnDeviceModelStatusInterop.kt‎

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/*
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* Copyright 2026 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.firebase.ai.ondevice.interop
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/** Represents the status of an on-device AI model. */
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public class OnDeviceModelStatusInterop private constructor(private val value: String) {
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override fun toString(): String = value
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override fun equals(other: Any?): Boolean =
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other is OnDeviceModelStatusInterop && value == other.value
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override fun hashCode(): Int = value.hashCode()
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public companion object {
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/** The on-device model is unavailable on the device. */
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@JvmField
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public val UNAVAILABLE: OnDeviceModelStatusInterop = OnDeviceModelStatusInterop("UNAVAILABLE")
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/** The on-device model is available for download. */
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@JvmField
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public val DOWNLOADABLE: OnDeviceModelStatusInterop = OnDeviceModelStatusInterop("DOWNLOADABLE")
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/** The on-device model is currently being downloaded. */
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@JvmField
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public val DOWNLOADING: OnDeviceModelStatusInterop = OnDeviceModelStatusInterop("DOWNLOADING")
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/** The on-device model is available and ready for use. */
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@JvmField
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public val AVAILABLE: OnDeviceModelStatusInterop = OnDeviceModelStatusInterop("AVAILABLE")
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}
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}

‎ai-logic/firebase-ai-ondevice/api.txt‎

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// Signature format: 3.0
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package com.google.firebase.ai.ondevice {
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public abstract class DownloadStatus {
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ctor public DownloadStatus();
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@Deprecated public abstract class DownloadStatus {
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ctor @Deprecated public DownloadStatus();
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}
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public static final class DownloadStatus.DownloadCompleted extends com.google.firebase.ai.ondevice.DownloadStatus {
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ctor public DownloadStatus.DownloadCompleted();
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@Deprecated public static final class DownloadStatus.DownloadCompleted extends com.google.firebase.ai.ondevice.DownloadStatus {
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ctor @Deprecated public DownloadStatus.DownloadCompleted();
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}
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public static final class DownloadStatus.DownloadFailed extends com.google.firebase.ai.ondevice.DownloadStatus {
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method public com.google.firebase.ai.ondevice.interop.FirebaseAIOnDeviceException getException();
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property public final com.google.firebase.ai.ondevice.interop.FirebaseAIOnDeviceException exception;
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@Deprecated public static final class DownloadStatus.DownloadFailed extends com.google.firebase.ai.ondevice.DownloadStatus {
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method @Deprecated public com.google.firebase.ai.ondevice.interop.FirebaseAIOnDeviceException getException();
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property @Deprecated public final com.google.firebase.ai.ondevice.interop.FirebaseAIOnDeviceException exception;
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}
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public static final class DownloadStatus.DownloadInProgress extends com.google.firebase.ai.ondevice.DownloadStatus {
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method public long getTotalBytesDownloaded();
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property public final long totalBytesDownloaded;
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@Deprecated public static final class DownloadStatus.DownloadInProgress extends com.google.firebase.ai.ondevice.DownloadStatus {
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method @Deprecated public long getTotalBytesDownloaded();
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property @Deprecated public final long totalBytesDownloaded;
2020
}
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public static final class DownloadStatus.DownloadStarted extends com.google.firebase.ai.ondevice.DownloadStatus {
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method public long getBytesToDownload();
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property public final long bytesToDownload;
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@Deprecated public static final class DownloadStatus.DownloadStarted extends com.google.firebase.ai.ondevice.DownloadStatus {
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method @Deprecated public long getBytesToDownload();
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property @Deprecated public final long bytesToDownload;
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}
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public final class FirebaseAIOnDevice {
28-
method public suspend Object? checkStatus(com.google.firebase.ai.ondevice.OnDeviceModelOption option, kotlin.coroutines.Continuation<? super com.google.firebase.ai.ondevice.OnDeviceModelStatus>);
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method public kotlinx.coroutines.flow.Flow<com.google.firebase.ai.ondevice.DownloadStatus> download(com.google.firebase.ai.ondevice.OnDeviceModelOption option);
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method @Deprecated public suspend Object? checkStatus(kotlin.coroutines.Continuation<? super com.google.firebase.ai.ondevice.OnDeviceModelStatus>);
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method @Deprecated public kotlinx.coroutines.flow.Flow<com.google.firebase.ai.ondevice.DownloadStatus> download();
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field public static final com.google.firebase.ai.ondevice.FirebaseAIOnDevice INSTANCE;
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}
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33-
public final class OnDeviceModelOption {
34-
field public static final com.google.firebase.ai.ondevice.OnDeviceModelOption.Companion Companion;
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field public static final com.google.firebase.ai.ondevice.OnDeviceModelOption PREVIEW;
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field public static final com.google.firebase.ai.ondevice.OnDeviceModelOption PREVIEW_FAST;
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field public static final com.google.firebase.ai.ondevice.OnDeviceModelOption STABLE;
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@Deprecated public final class OnDeviceModelStatus {
34+
field @Deprecated public static final com.google.firebase.ai.ondevice.OnDeviceModelStatus AVAILABLE;
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field @Deprecated public static final com.google.firebase.ai.ondevice.OnDeviceModelStatus.Companion Companion;
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field @Deprecated public static final com.google.firebase.ai.ondevice.OnDeviceModelStatus DOWNLOADABLE;
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field @Deprecated public static final com.google.firebase.ai.ondevice.OnDeviceModelStatus DOWNLOADING;
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field @Deprecated public static final com.google.firebase.ai.ondevice.OnDeviceModelStatus UNAVAILABLE;
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}
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public static final class OnDeviceModelOption.Companion {
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}
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public final class OnDeviceModelStatus {
44-
field public static final com.google.firebase.ai.ondevice.OnDeviceModelStatus AVAILABLE;
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field public static final com.google.firebase.ai.ondevice.OnDeviceModelStatus.Companion Companion;
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field public static final com.google.firebase.ai.ondevice.OnDeviceModelStatus DOWNLOADABLE;
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field public static final com.google.firebase.ai.ondevice.OnDeviceModelStatus DOWNLOADING;
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field public static final com.google.firebase.ai.ondevice.OnDeviceModelStatus UNAVAILABLE;
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}
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public static final class OnDeviceModelStatus.Companion {
41+
@Deprecated public static final class OnDeviceModelStatus.Companion {
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}
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}

‎ai-logic/firebase-ai-ondevice/src/main/kotlin/com/google/firebase/ai/ondevice/Converters.kt‎

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@@ -18,11 +18,15 @@ package com.google.firebase.ai.ondevice
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import com.google.firebase.ai.ondevice.interop.Candidate
2020
import com.google.firebase.ai.ondevice.interop.CountTokensResponse
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import com.google.firebase.ai.ondevice.interop.DownloadStatusInterop
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import com.google.firebase.ai.ondevice.interop.FinishReason
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import com.google.firebase.ai.ondevice.interop.FirebaseAIOnDeviceException
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import com.google.firebase.ai.ondevice.interop.FirebaseAIOnDeviceInvalidRequestException
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import com.google.firebase.ai.ondevice.interop.FirebaseAIOnDeviceUnknownException
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import com.google.firebase.ai.ondevice.interop.GenerateContentResponse
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import com.google.firebase.ai.ondevice.interop.GenerationConfig
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import com.google.firebase.ai.ondevice.interop.ModelConfig
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import com.google.firebase.ai.ondevice.interop.OnDeviceModelStatusInterop
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import com.google.mlkit.genai.prompt.GenerateContentRequest
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import com.google.mlkit.genai.prompt.ImagePart
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import com.google.mlkit.genai.prompt.ModelPreference
@@ -121,3 +125,34 @@ private fun generateContentRequest(
121125
builder.init()
122126
return builder.build()
123127
}
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// ========================================================================
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// `DownloadStatus` and `OnDeviceModelStatus` converter extension functions
131+
// ========================================================================
132+
internal fun com.google.mlkit.genai.common.DownloadStatus.toInterop(): DownloadStatusInterop =
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when (this) {
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is com.google.mlkit.genai.common.DownloadStatus.DownloadStarted ->
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DownloadStatusInterop.DownloadStarted(bytesToDownload)
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is com.google.mlkit.genai.common.DownloadStatus.DownloadProgress ->
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DownloadStatusInterop.DownloadInProgress(totalBytesDownloaded)
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is com.google.mlkit.genai.common.DownloadStatus.DownloadCompleted ->
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DownloadStatusInterop.DownloadCompleted()
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is com.google.mlkit.genai.common.DownloadStatus.DownloadFailed ->
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DownloadStatusInterop.DownloadFailed(FirebaseAIOnDeviceException.from(e))
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else ->
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DownloadStatusInterop.DownloadFailed(
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FirebaseAIOnDeviceUnknownException("Unknown download status")
145+
)
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}
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internal fun Int.toInteropStatus(): OnDeviceModelStatusInterop =
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when (this) {
150+
com.google.mlkit.genai.common.FeatureStatus.UNAVAILABLE ->
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OnDeviceModelStatusInterop.UNAVAILABLE
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com.google.mlkit.genai.common.FeatureStatus.DOWNLOADABLE ->
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OnDeviceModelStatusInterop.DOWNLOADABLE
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com.google.mlkit.genai.common.FeatureStatus.DOWNLOADING ->
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OnDeviceModelStatusInterop.DOWNLOADING
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com.google.mlkit.genai.common.FeatureStatus.AVAILABLE -> OnDeviceModelStatusInterop.AVAILABLE
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else -> OnDeviceModelStatusInterop.UNAVAILABLE
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}

‎ai-logic/firebase-ai-ondevice/src/main/kotlin/com/google/firebase/ai/ondevice/FirebaseAIOnDevice.kt‎

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import com.google.firebase.ai.ondevice.interop.FirebaseAIOnDeviceException
2020
import com.google.firebase.ai.ondevice.interop.FirebaseAIOnDeviceUnknownException
21-
import com.google.firebase.ai.ondevice.interop.GenerationConfig
2221
import com.google.mlkit.genai.common.FeatureStatus
2322
import com.google.mlkit.genai.prompt.Generation
24-
import com.google.mlkit.genai.prompt.ModelPreference as MlKitModelPreference
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import com.google.mlkit.genai.prompt.ModelReleaseStage as MlKitModelReleaseStage
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import com.google.mlkit.genai.prompt.generationConfig
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import com.google.mlkit.genai.prompt.modelConfig
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import kotlinx.coroutines.flow.Flow
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import kotlinx.coroutines.flow.map
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/**
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* Checks the current status / availability of the on-device AI model.
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*
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* @param option The configuration option for the model.
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* @return An [OnDeviceModelStatus] object indicating the current state of the model.
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*/
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public suspend fun checkStatus(option: OnDeviceModelOption): OnDeviceModelStatus {
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return OnDeviceModelStatus.fromFeatureStatus(
46-
Generation.getClient(option.toMlKit()).checkStatus()
47-
)
38+
@Deprecated("Use `GenerativeModel.OnDeviceExtension` from `firebase-ai` instead")
39+
public suspend fun checkStatus(): OnDeviceModelStatus {
40+
return OnDeviceModelStatus.fromFeatureStatus(Generation.getClient().checkStatus())
4841
}
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/**
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5447
* Consumers should collect the flow to start the download process, and optionally process any
5548
* updates on the download state, progress, and completion or failure.
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*
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* @param option The configuration option for the model.
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* @return A [Flow] of [DownloadStatus] objects representing the download lifecycle.
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*/
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public fun download(option: OnDeviceModelOption): Flow<DownloadStatus> {
61-
return Generation.getClient(option.toMlKit()).download().map { DownloadStatus.fromMlKit(it) }
52+
@Deprecated("Use `GenerativeModel.OnDeviceExtension` from `firebase-ai` instead")
53+
public fun download(): Flow<DownloadStatus> {
54+
return Generation.getClient().download().map { DownloadStatus.fromMlKit(it) }
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}
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}
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/** Options for configuring the on-device AI model. */
66-
public class OnDeviceModelOption private constructor(private val value: String) {
67-
override fun toString(): String = value
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public companion object {
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/** Selects the latest stable model. */
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@JvmField public val STABLE: OnDeviceModelOption = OnDeviceModelOption("stable")
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/** Selects the latest preview model with full performance. */
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@JvmField public val PREVIEW: OnDeviceModelOption = OnDeviceModelOption("preview")
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/** Selects the latest preview model optimized for speed. */
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@JvmField public val PREVIEW_FAST: OnDeviceModelOption = OnDeviceModelOption("preview_fast")
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}
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}
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internal fun OnDeviceModelOption.toMlKit(): com.google.mlkit.genai.prompt.GenerationConfig =
82-
generationConfig {
83-
modelConfig = modelConfig {
84-
when (this@toMlKit) {
85-
OnDeviceModelOption.STABLE -> {
86-
releaseStage = MlKitModelReleaseStage.STABLE
87-
preference = MlKitModelPreference.FULL
88-
}
89-
OnDeviceModelOption.PREVIEW -> {
90-
releaseStage = MlKitModelReleaseStage.PREVIEW
91-
preference = MlKitModelPreference.FULL
92-
}
93-
OnDeviceModelOption.PREVIEW_FAST -> {
94-
releaseStage = MlKitModelReleaseStage.PREVIEW
95-
preference = MlKitModelPreference.FAST
96-
}
97-
else -> throw IllegalArgumentException("Unknown option: ${this@toMlKit}")
98-
}
99-
}
100-
}
101-
10258
/** Represents the current status of the on-device AI model. */
59+
@Deprecated("Use `GenerativeModel.OnDeviceExtension` from `firebase-ai` instead")
10360
public class OnDeviceModelStatus private constructor(private val status: Int) {
10461
public companion object {
10562
/** The on-device model is unavailable on the device. */
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13592
* This class has several concrete subclasses, each representing a specific stage or outcome of the
13693
* download process.
13794
*/
95+
@Deprecated("Use `GenerativeModel.OnDeviceExtension` from `firebase-ai` instead")
13896
public abstract class DownloadStatus {
13997
/**
14098
* Represents when a download has just started.

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