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feat(firebase-ai): add Java and Kotlin code snippets (#645)
* feat: add Chat snippets * feat: add Function Calling snippets * feat: safety settings and model parameter snippets * feat: add system instructions snippets * chore: use gemini-2.5-flash and imagen-4.0-generate-001
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‎firebase-ai/app/src/main/java/com/google/firebase/example/ailogic/java/CommonSnippets.java‎

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package com.google.firebase.example.ailogic.java;
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import androidx.lifecycle.ViewModel;
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import com.google.common.util.concurrent.FutureCallback;
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import com.google.common.util.concurrent.Futures;
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import com.google.common.util.concurrent.ListenableFuture;
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import com.google.firebase.ai.FirebaseAI;
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import com.google.firebase.ai.GenerativeModel;
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import com.google.firebase.ai.java.ChatFutures;
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import com.google.firebase.ai.java.GenerativeModelFutures;
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import com.google.firebase.ai.type.Content;
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import com.google.firebase.ai.type.FunctionCallPart;
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import com.google.firebase.ai.type.FunctionResponsePart;
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import com.google.firebase.ai.type.GenerateContentResponse;
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import com.google.firebase.ai.type.Schema;
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import com.google.firebase.ai.type.TextPart;
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import com.google.firebase.ai.type.Tool;
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import com.google.firebase.ai.type.FunctionDeclaration;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.List;
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import java.util.Map;
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import java.util.concurrent.Executor;
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import java.util.concurrent.Executors;
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import kotlinx.serialization.json.JsonElement;
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import kotlinx.serialization.json.JsonElementKt;
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import kotlinx.serialization.json.JsonObject;
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import kotlinx.serialization.json.JsonPrimitive;
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import org.reactivestreams.Publisher;
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import org.reactivestreams.Subscriber;
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import org.reactivestreams.Subscription;
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public class CommonSnippets extends ViewModel {
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private Executor executor;
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private GenerativeModel ai = FirebaseAI.getInstance().generativeModel("gemini-2.5-flash");
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private GenerativeModelFutures model = GenerativeModelFutures.from(ai);
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public void chat() {
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chatNonStreaming();
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chatStreaming();
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}
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void chatNonStreaming() {
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// [START chat_non_streaming]
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// (optional) Create previous chat history for context
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Content.Builder userContentBuilder = new Content.Builder();
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userContentBuilder.setRole("user");
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userContentBuilder.addText("Hello, I have 2 dogs in my house.");
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Content userContent = userContentBuilder.build();
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Content.Builder modelContentBuilder = new Content.Builder();
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modelContentBuilder.setRole("model");
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modelContentBuilder.addText("Great to meet you. What would you like to know?");
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Content modelContent = userContentBuilder.build();
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List<Content> history = Arrays.asList(userContent, modelContent);
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// Initialize the chat
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ChatFutures chat = model.startChat(history);
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// Create a new user message
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Content.Builder messageBuilder = new Content.Builder();
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messageBuilder.setRole("user");
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messageBuilder.addText("How many paws are in my house?");
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Content message = messageBuilder.build();
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// Send the message
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ListenableFuture<GenerateContentResponse> response = chat.sendMessage(message);
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Futures.addCallback(
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response,
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new FutureCallback<GenerateContentResponse>() {
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@Override
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public void onSuccess(GenerateContentResponse result) {
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String resultText = result.getText();
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System.out.println(resultText);
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}
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@Override
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public void onFailure(Throwable t) {
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t.printStackTrace();
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}
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},
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executor);
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// [END chat_non_streaming]
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}
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void chatStreaming() {
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// [START chat_streaming]
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// (optional) Create previous chat history for context
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Content.Builder userContentBuilder = new Content.Builder();
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userContentBuilder.setRole("user");
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userContentBuilder.addText("Hello, I have 2 dogs in my house.");
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Content userContent = userContentBuilder.build();
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Content.Builder modelContentBuilder = new Content.Builder();
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modelContentBuilder.setRole("model");
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modelContentBuilder.addText("Great to meet you. What would you like to know?");
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Content modelContent = userContentBuilder.build();
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List<Content> history = Arrays.asList(userContent, modelContent);
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// Initialize the chat
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ChatFutures chat = model.startChat(history);
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// Create a new user message
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Content.Builder messageBuilder = new Content.Builder();
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messageBuilder.setRole("user");
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messageBuilder.addText("How many paws are in my house?");
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Content message = messageBuilder.build();
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// Send the message
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Publisher<GenerateContentResponse> streamingResponse = chat.sendMessageStream(message);
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final String[] fullResponse = {""};
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streamingResponse.subscribe(
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new Subscriber<GenerateContentResponse>() {
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@Override
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public void onNext(GenerateContentResponse generateContentResponse) {
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String chunk = generateContentResponse.getText();
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fullResponse[0] += chunk;
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}
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@Override
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public void onComplete() {
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System.out.println(fullResponse[0]);
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}
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// ... other methods omitted for brevity
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// [START_EXCLUDE]
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@Override
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public void onSubscribe(Subscription s) {
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}
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@Override
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public void onError(Throwable t) {
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}
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// [END_EXCLUDE]
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});
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// [END chat_streaming]
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}
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public void functionCalling() {
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// [START function_calling_create_function_declaration]
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FunctionDeclaration fetchWeatherTool =
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new FunctionDeclaration(
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"fetchWeather",
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"Get the weather conditions for a specific city on a specific date.",
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Map.of(
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"location",
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Schema.obj(
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Map.of(
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"city", Schema.str("The city of the location."),
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"state", Schema.str("The US state of the location."))),
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"date",
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Schema.str(
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"The date for which to get the weather. "
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+ "Date must be in the format: YYYY-MM-DD.")),
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Collections.emptyList());
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// [END function_calling_create_function_declaration]
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// [START function_calling_generate_function_call]
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String prompt = "What was the weather in Boston on October 17, 2024?";
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ChatFutures chatFutures = model.startChat();
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// Send the user's question (the prompt) to the model using multi-turn chat.
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ListenableFuture<GenerateContentResponse> response =
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chatFutures.sendMessage(new Content("user", List.of(new TextPart(prompt))));
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ListenableFuture<JsonObject> handleFunctionCallFuture =
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Futures.transform(
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response,
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result -> {
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for (FunctionCallPart functionCall : result.getFunctionCalls()) {
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if (functionCall.getName().equals("fetchWeather")) {
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Map<String, JsonElement> args = functionCall.getArgs();
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JsonObject locationJsonObject = JsonElementKt.getJsonObject(args.get("location"));
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String city =
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JsonElementKt.getContentOrNull(
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JsonElementKt.getJsonPrimitive(locationJsonObject.get("city")));
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String state =
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JsonElementKt.getContentOrNull(
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JsonElementKt.getJsonPrimitive(locationJsonObject.get("state")));
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Location location = new Location(city, state);
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String date =
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JsonElementKt.getContentOrNull(
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JsonElementKt.getJsonPrimitive(args.get("date")));
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return fetchWeather(location, date);
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}
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}
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return null;
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},
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Executors.newSingleThreadExecutor());
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// [END function_calling_generate_function_call]
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// [START function_calling_pass_back_function_response]
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ListenableFuture<GenerateContentResponse> modelResponseFuture =
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Futures.transformAsync(
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handleFunctionCallFuture,
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// Send the response(s) from the function back to the model
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// so that the model can use it to generate its final response.
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functionCallResult ->
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chatFutures.sendMessage(
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new Content(
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"function",
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List.of(new FunctionResponsePart("fetchWeather", functionCallResult)))),
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Executors.newSingleThreadExecutor());
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Futures.addCallback(
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modelResponseFuture,
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new FutureCallback<GenerateContentResponse>() {
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@Override
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public void onSuccess(GenerateContentResponse result) {
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if (result.getText() != null) {
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// Log the text response.
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System.out.println(result.getText());
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}
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}
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@Override
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public void onFailure(Throwable t) {
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// handle error
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}
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},
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Executors.newSingleThreadExecutor());
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// [END function_calling_pass_back_function_response]
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}
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// [START function_calling_write_function]
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// This function calls a hypothetical external API that returns
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// a collection of weather information for a given location on a given date.
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// `location` is an object of the form { city: string, state: string }
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public JsonObject fetchWeather(Location location, String date) {
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// TODO(developer): Write a standard function that would call to an external weather API.
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// For demo purposes, this hypothetical response is hardcoded here in the expected format.
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return new JsonObject(
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Map.of(
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"temperature",
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JsonElementKt.JsonPrimitive(38),
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"chancePrecipitation",
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JsonElementKt.JsonPrimitive("56%"),
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"cloudConditions",
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JsonElementKt.JsonPrimitive("partlyCloudy")
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)
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);
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}
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// [END function_calling_write_function]
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}
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class Location {
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public String city;
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public String state;
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public Location(String city, String state) {
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this.city = city;
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this.state = state;
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}
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}

‎firebase-ai/app/src/main/java/com/google/firebase/example/ailogic/java/GeneralViewModel.java‎

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