Google AI Client SDK

The Google AI Client SDK lets you to integrate the Gemini API to use Gemini Pro models in your Android app.

A free-of-charge tier lets you experiment at no cost. For other pricing details, see our pricing guide.

The Gemini API is available in some countries and regions. If the Gemini API isn't available in your country or region, you can still access Gemini Pro models through the Vertex AI SDK for Android.

**Figure 1.** Gemini API integration architecture.

Getting started

Design your prompt

Start by prototyping your prompt in Google AI Studio.

Google AI Studio is an IDE for prompt design and prototyping. It lets you upload files to test prompts with text and images and save a prompt to revisit it later.

Creating the right prompt for your use-case is more art than science, which makes experimentation critical. You can learn more about prompting in the official Gemini documentation.

To learn more about the advanced capabilities of Google AI Studio, see the Google AI Studio quickstart.

Generate your API Key

Once satisfied with your prompt, click Get API key to generate your Gemini API key. The key will be bundled with your application, which is ok for experimentation but not recommended for production use cases.

Also, to prevent your API key from being committed to your source code repository, use the Secrets gradle plugin.

Add the gradle dependency

Add the dependency for the Google AI client SDK to your app:

Kotlin

dependencies {
  [...]
 implementation("com.google.ai.client.generativeai:generativeai:0.7.0")
}

Java

dependencies {
  [...]
  implementation("com.google.ai.client.generativeai:generativeai:0.7.0")

  // Required to use `ListenableFuture` from Guava Android for one-shot generation
  implementation("com.google.guava:guava:31.0.1-android")

  // Required to use `Publisher` from Reactive Streams for streaming operations
  implementation("org.reactivestreams:reactive-streams:1.0.4")
}

Integrate Google AI Client SDK to your Kotlin code:

Create a GenerativeModel

Start by instantiating a GenerativeModel by providing the following:

The model: gemini-1.0-pro, gemini-1.0-pro-vision, gemini-1.5-pro or gemini-1.5-flash
Your API key generated with Google AI Studio.

You can optionally define the model parameters and provide values for the temperature, topK, topP, and the maximum output tokens.

You can also define the safety features for the following topics:

HARASSMENT
HATE_SPEECH
SEXUALLY_EXPLICIT
DANGEROUS_CONTENT

Kotlin

val model = GenerativeModel(
  model = "gemini-1.5-flash-001",
  apiKey = BuildConfig.apikey,
  generationConfig = generationConfig {
    temperature = 0.15f
    topK = 32
    topP = 1f
    maxOutputTokens = 4096
  },
  safetySettings = listOf(
    SafetySetting(HarmCategory.HARASSMENT, BlockThreshold.MEDIUM_AND_ABOVE),
    SafetySetting(HarmCategory.HATE_SPEECH, BlockThreshold.MEDIUM_AND_ABOVE),
    SafetySetting(HarmCategory.SEXUALLY_EXPLICIT, BlockThreshold.MEDIUM_AND_ABOVE),
    SafetySetting(HarmCategory.DANGEROUS_CONTENT, BlockThreshold.MEDIUM_AND_ABOVE),
  )
)

Java

GenerationConfig.Builder configBuilder = new GenerationConfig.Builder();
configBuilder.temperature = 0.15f;
configBuilder.topK = 32;
configBuilder.topP = 1f;
configBuilder.maxOutputTokens = 4096;

ArrayList<SafetySetting> safetySettings = new ArrayList();
safetySettings.add(new SafetySetting(HarmCategory.HARASSMENT, BlockThreshold.MEDIUM_AND_ABOVE));
safetySettings.add(new SafetySetting(HarmCategory.HATE_SPEECH, BlockThreshold.MEDIUM_AND_ABOVE));
safetySettings.add(new SafetySetting(HarmCategory.SEXUALLY_EXPLICIT, BlockThreshold.MEDIUM_AND_ABOVE));
safetySettings.add(new SafetySetting(HarmCategory.DANGEROUS_CONTENT, BlockThreshold.MEDIUM_AND_ABOVE));

GenerativeModel gm = new GenerativeModel(
    "gemini-1.5-flash-001",
    BuildConfig.apiKey,
    configBuilder.build(),
    safetySettings
);

Text generation

To generate a text response, call GenerativeModel.generateContent() with your prompt:

Kotlin

scope.launch {
  val response = model.generateContent("Write a story about a green robot.")
}

Java

// In Java, create a GenerativeModelFutures from the GenerativeModel.
// generateContent() returns a ListenableFuture.
// Learn more:
// https://developer.android.com/develop/background-work/background-tasks/asynchronous/listenablefuture

GenerativeModelFutures model = GenerativeModelFutures.from(gm);

Content content = new Content.Builder()
      .addText("Write a story about a green robot.")
      .build();
Executor executor = // ...

ListenableFuture<GenerateContentResponse> response = model.generateContent(content);

Futures.addCallback(response, new FutureCallback<GenerateContentResponse>() {
      @Override
      public void onSuccess(GenerateContentResponse result) {
        String resultText = result.getText();
      }

      @Override
      public void onFailure(Throwable t) {
        t.printStackTrace();
      }
}, executor);

Note that generateContent() is a suspend function, which integrates well with existing Kotlin code.

Image prompting

To augment a text prompt with images, pass an image as a bitmap when calling generateContent():

Kotlin

scope.launch {
  val response = model.generateContent(
    content {
      image(bitmap)
      text("What is the object in this picture?")
    }
  )
}

Java

Content content = new Content.Builder()
     .addImage(bitmap)
     .addText("What is the object in this picture?")
     .build();

Executor executor = // ...

ListenableFuture<GenerateContentResponse> response = model.generateContent(content);

Futures.addCallback(response, new FutureCallback<GenerateContentResponse>() {
      @Override
      public void onSuccess(GenerateContentResponse result) {
        String resultText = result.getText();
      }

      @Override
      public void onFailure(Throwable t) {
        t.printStackTrace();
      }
}, executor);

Multiturn chat

The Google AI client SDK also lets you implement multi-turn conversations. Initialize a chat with the startChat() function. You can optionally provide a message history. Then call the sendMessage() function to send chat messages:

Kotlin

val chat = model.startChat(
    history = listOf(
        content(role = "user") { text("Hello, I have 2 dogs in my house.") },
        content(role = "model") { text("Great to meet you. What would you like to know?") }
    )
)

scope.launch {
   val response = chat.sendMessage("How many paws are in my house?")
}

Java

Content.Builder userContentBuilder = new Content.Builder();
userContentBuilder.setRole("user");
userContentBuilder.addText("Hello, I have 2 dogs in my house.");
Content userContent = userContentBuilder.build();

// (Optional) create message history
Content.Builder modelContentBuilder = new Content.Builder();
modelContentBuilder.setRole("model");
modelContentBuilder.addText("Great to meet you. What would you like to know?");
Content modelContent = userContentBuilder.build();

List<Content> history = Arrays.asList(userContent, modelContent);

// Initialize the chat
ChatFutures chat = model.startChat(history);

Content.Builder userMessageBuilder = new Content.Builder();
userMessageBuilder.setRole("user");
userMessageBuilder.addText("How many paws are in my house?");
Content userMessage = userMessageBuilder.build();

Executor executor = // ...

ListenableFuture<GenerateContentResponse> response = chat.sendMessage(userMessage);

Futures.addCallback(response, new FutureCallback<GenerateContentResponse>() {
    @Override
    public void onSuccess(GenerateContentResponse result) {
        String resultText = result.getText();
    }

    @Override
    public void onFailure(Throwable t) {
        t.printStackTrace();
    }
}, executor);

Response streaming

To start displaying the response progressively as soon the first tokens are produced, use generateContentStream(), and collect the response stream:

Kotlin

someScope.launch {
  var outputContent = ""
  
  generativeModel.generateContentStream(inputContent)
    .collect { response ->
      outputContent += response.text
    }
}

Java

// In Java, the method generateContentStream() returns a Publisher
// from the Reactive Streams library.
// https://www.reactive-streams.org/

Publisher<GenerateContentResponse> streamingResponse =
    model.generateContentStream(content);

StringBuilder outputContent = new StringBuilder();

streamingResponse.subscribe(new Subscriber<GenerateContentResponse>() {
  @Override
  public void onNext(GenerateContentResponse generateContentResponse) {
    String chunk = generateContentResponse.getText();
    outputContent.append(chunk);
  }

    @Override
    public void onComplete() {
        // ...
    }

    @Override
    public void onError(Throwable t) {
        t.printStackTrace();
    }

    @Override
    public void onSubscribe(Subscription s) {
       s.request(Long.MAX_VALUE);  // Request all messages
 }
});

Android Studio

Android Studio provides additional tools to help you get started.

Gemini API starter template: This starter template helps you create an API key directly from Android Studio and generates a project that includes the necessary Android dependencies to use the Gemini APIs.
Generative AI sample: This sample lets you import the Google AI SDK for Android sample app in Android Studio.

Next steps

Review the Google AI SDK for Android sample app on GitHub.
Learn more about the Google AI client SDK in the official Gemini documentation.