Gemini Live API

// Initialize the `LiveModel`
val model = Firebase.ai(backend = GenerativeBackend.googleAI()).liveModel(
    modelName = "gemini-2.5-flash-native-audio-preview-12-2025",
    generationConfig = liveGenerationConfig {
        responseModality = ResponseModality.AUDIO
        speechConfig = SpeechConfig(voice = Voice("FENRIR"))
    }
)
GeminiLive.kt

// Initialize the `LiveModel`
LiveGenerativeModel model = FirebaseAI
       .getInstance(GenerativeBackend.googleAI())
       .liveModel(
              "gemini-2.5-flash-native-audio-preview-12-2025",
              new LiveGenerationConfig.Builder()
                     .setResponseModality(ResponseModality.AUDIO)
                     .setSpeechConfig(new SpeechConfig(new Voice("FENRIR"))
              ).build(),
        null,
        null
);

val systemInstruction = content {
    text("You are a helpful assistant, you main role is [...]")
}

val model = Firebase.ai(backend = GenerativeBackend.googleAI()).liveModel(
    modelName = "gemini-2.5-flash-native-audio-preview-12-2025",
    generationConfig = liveGenerationConfig {
        responseModality = ResponseModality.AUDIO
        speechConfig = SpeechConfig(voice = Voice("FENRIR"))
    },
    systemInstruction = systemInstruction,
)
GeminiLive.kt

Content systemInstruction = new Content.Builder()
       .addText("You are a helpful assistant, you main role is [...]")
       .build();

LiveGenerativeModel model = FirebaseAI
       .getInstance(GenerativeBackend.googleAI())
       .liveModel(
              "gemini-2.5-flash-native-audio-preview-12-2025",
              new LiveGenerationConfig.Builder()
                     .setResponseModality(ResponseModality.AUDIO)
                     .setSpeechConfig(new SpeechConfig(new Voice("FENRIR"))
              ).build(),
        tools, // null if you don't want to use function calling
        systemInstruction
);

val session = model.connect()
session.startAudioConversation()
GeminiLive.kt

LiveModelFutures model = LiveModelFutures.from(liveModel);
ListenableFuture<LiveSession> sessionFuture = model.connect();

Futures.addCallback(sessionFuture, new FutureCallback<LiveSession>() {
    @Override
    public void onSuccess(LiveSession ses) {
        LiveSessionFutures session = LiveSessionFutures.from(ses);
        session.startAudioConversation();
    }
    @Override
    public void onFailure(Throwable t) {
        // Handle exceptions
    }
}, executor);

val itemList = mutableListOf<String>()

fun addList(item: String) {
    itemList.add(item)
}

val addListFunctionDeclaration = FunctionDeclaration(
    name = "addList",
    description = "Function adding an item the list",
    parameters = mapOf(
        "item" to Schema.string("A short string describing the item to add to the list")
    )
)
GeminiLive.kt

HashMap<String, Schema> addListParams = new HashMap<String, Schema>(1);

addListParams.put("item", Schema.str("A short string describing the item to add to the list"));

FunctionDeclaration addListFunctionDeclaration = new FunctionDeclaration(
    "addList",
    "Function adding an item the list",
    addListParams,
    Collections.emptyList()
);

val addListTool = Tool.functionDeclarations(listOf(addListFunctionDeclaration))

val model = Firebase.ai(backend = GenerativeBackend.googleAI()).liveModel(
    modelName = "gemini-2.5-flash-native-audio-preview-12-2025",
    generationConfig = liveGenerationConfig {
        responseModality = ResponseModality.AUDIO
        speechConfig = SpeechConfig(voice = Voice("FENRIR"))
    },
    systemInstruction = systemInstruction,
    tools = listOf(addListTool)
)
GeminiLive.kt

LiveGenerativeModel model = FirebaseAI.getInstance(
    GenerativeBackend.googleAI()).liveModel(
        "gemini-2.5-flash-native-audio-preview-12-2025",
  new LiveGenerationConfig.Builder()
        .setResponseModality(ResponseModality.AUDIO)
        .setSpeechConfig(new SpeechConfig(new Voice("FENRIR")))
        .build(),
  List.of(Tool.functionDeclarations(List.of(addListFunctionDeclaration))),
               null,
               systemInstruction
        );

session.startAudioConversation(::functionCallHandler)

// ...

fun functionCallHandler(functionCall: FunctionCallPart): FunctionResponsePart {
    return when (functionCall.name) {
        "addList" -> {
            // Extract function parameter from functionCallPart
            val itemName = functionCall.args["item"]!!.jsonPrimitive.content
            // Call function with parameter
            addList(itemName)
            // Confirm the function call to the model
            val response = JsonObject(
                mapOf(
                    "success" to JsonPrimitive(true),
                    "message" to JsonPrimitive("Item $itemName added to the todo list")
                )
            )
            FunctionResponsePart(functionCall.name, response)
        }
        else -> {
            val response = JsonObject(
                mapOf(
                    "error" to JsonPrimitive("Unknown function: ${functionCall.name}")
                )
            )
            FunctionResponsePart(functionCall.name, response)
        }
    }
}
GeminiLive.kt

Futures.addCallback(sessionFuture, new FutureCallback<LiveSessionFutures>() {

    @RequiresPermission(Manifest.permission.RECORD_AUDIO)
    @Override
    @OptIn(markerClass = PublicPreviewAPI.class)
    public void onSuccess(LiveSessionFutures ses) {
        ses.startAudioConversation(::handleFunctionCallFuture);
    }

    @Override
    public void onFailure(Throwable t) {
        // Handle exceptions
    }
}, executor);

// ...

ListenableFuture<JsonObject> handleFunctionCallFuture = Futures.transform(response, result -> {
    for (FunctionCallPart functionCall : result.getFunctionCalls()) {
        if (functionCall.getName().equals("addList")) {
            Map<String, JsonElement> args = functionCall.getArgs();
            String item =
                    JsonElementKt.getContentOrNull(
                            JsonElementKt.getJsonPrimitive(
                                    locationJsonObject.get("item")));
            return addList(item);
        }
    }
    return null;
}, Executors.newSingleThreadExecutor());