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/*
* Copyright 2025 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.snippets.ai;
import android.app.Application;
import android.content.ContentResolver;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.util.Log;
import com.example.snippets.ai.R;
import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.firebase.ai.FirebaseAI;
import com.google.firebase.ai.GenerativeModel;
import com.google.firebase.ai.java.ChatFutures;
import com.google.firebase.ai.java.GenerativeModelFutures;
import com.google.firebase.ai.type.Content;
import com.google.firebase.ai.type.GenerateContentResponse;
import com.google.firebase.ai.type.GenerationConfig;
import com.google.firebase.ai.type.GenerativeBackend;
import com.google.firebase.ai.type.ImagePart;
import com.google.firebase.ai.type.Part;
import com.google.firebase.ai.type.ResponseModality;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.Executor;
@SuppressWarnings("unused")
public final class GeminiDeveloperApiSnippetsJava {
private static final String TAG = "GeminiDeveloperApiSnippetsJava";
private GeminiDeveloperApiSnippetsJava() {}
static final class GeminiDeveloperApi25FlashModelConfigurationJava {
public static GenerativeModelFutures model;
static {
// [START android_gemini_developer_api_gemini_25_flash_model_java]
GenerativeModel firebaseAI = FirebaseAI.getInstance(GenerativeBackend.googleAI())
.generativeModel("gemini-2.5-flash");
GenerativeModelFutures model = GenerativeModelFutures.from(firebaseAI);
// [END android_gemini_developer_api_gemini_25_flash_model_java]
GeminiDeveloperApi25FlashModelConfigurationJava.model = model;
}
}
static final class GeminiDeveloperApiFlashModelConfigurationJava {
public static GenerativeModelFutures model;
static {
// [START android_gemini_developer_api_gemini_flash_model_java]
GenerativeModel firebaseAI = FirebaseAI.getInstance(GenerativeBackend.googleAI())
.generativeModel("gemini-3.5-flash");
GenerativeModelFutures model = GenerativeModelFutures.from(firebaseAI);
// [END android_gemini_developer_api_gemini_flash_model_java]
GeminiDeveloperApiFlashModelConfigurationJava.model = model;
}
}
static final class Gemini25FlashImagePreviewModelConfigurationJava {
public static GenerativeModelFutures model;
static {
// [START android_gemini_developer_api_gemini_25_flash_image_model_java]
GenerativeModel ai = FirebaseAI.getInstance(GenerativeBackend.googleAI()).generativeModel(
"gemini-2.5-flash-image-preview",
// Configure the model to respond with text and images (required)
new GenerationConfig.Builder()
.setResponseModalities(Arrays.asList(ResponseModality.TEXT, ResponseModality.IMAGE))
.build()
);
GenerativeModelFutures model = GenerativeModelFutures.from(ai);
// [END android_gemini_developer_api_gemini_25_flash_image_model_java]
Gemini25FlashImagePreviewModelConfigurationJava.model = model;
}
}
static final class GeminiFlashImageModelConfigurationJava {
public static GenerativeModelFutures model;
static {
// [START android_gemini_developer_api_gemini_flash_image_model_java]
GenerativeModel ai = FirebaseAI.getInstance(GenerativeBackend.googleAI()).generativeModel(
"gemini-3.1-flash-image",
// Configure the model to respond with text and images (required)
new GenerationConfig.Builder()
.setResponseModalities(Arrays.asList(ResponseModality.TEXT, ResponseModality.IMAGE))
.build()
);
GenerativeModelFutures model = GenerativeModelFutures.from(ai);
// [END android_gemini_developer_api_gemini_flash_image_model_java]
GeminiFlashImageModelConfigurationJava.model = model;
}
}
public static void textOnlyInput(Executor executor) {
GenerativeModelFutures model = GeminiDeveloperApiFlashModelConfigurationJava.model;
// [START android_gemini_developer_api_text_only_input_java]
Content prompt = new Content.Builder()
.addText("Write a story about a magic backpack.")
.build();
ListenableFuture<GenerateContentResponse> response = model.generateContent(prompt);
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);
// [END android_gemini_developer_api_text_only_input_java]
}
public static void textAndImageInput(Executor executor, Bitmap bitmap) {
GenerativeModelFutures model = GeminiDeveloperApiFlashModelConfigurationJava.model;
// [START android_gemini_developer_api_multimodal_input_java]
Content content = new Content.Builder()
.addImage(bitmap)
.addText("what is the object in the picture?")
.build();
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);
// [END android_gemini_developer_api_multimodal_input_java]
}
public static void textAndAudioInput(Executor executor, Application applicationContext, Uri audioUri) {
GenerativeModelFutures model = GeminiDeveloperApiFlashModelConfigurationJava.model;
// [START android_gemini_developer_api_multimodal_audio_input_java]
ContentResolver resolver = applicationContext.getContentResolver();
try (InputStream stream = resolver.openInputStream(audioUri)) {
File audioFile = new File(new URI(audioUri.toString()));
int audioSize = (int) audioFile.length();
byte[] audioBytes = new byte[audioSize];
if (stream != null) {
stream.read(audioBytes, 0, audioBytes.length);
stream.close();
// Provide a prompt that includes audio specified earlier and text
Content prompt = new Content.Builder()
.addInlineData(audioBytes, "audio/mpeg") // Specify the appropriate audio MIME type
.addText("Transcribe what's said in this audio recording.")
.build();
// To generate text output, call `generateContent` with the prompt
ListenableFuture<GenerateContentResponse> response = model.generateContent(prompt);
Futures.addCallback(response, new FutureCallback<GenerateContentResponse>() {
@Override
public void onSuccess(GenerateContentResponse result) {
String text = result.getText();
Log.d(TAG, (text == null) ? "" : text);
}
@Override
public void onFailure(Throwable t) {
Log.e(TAG, "Failed to generate a response", t);
}
}, executor);
} else {
Log.e(TAG, "Error getting input stream for file.");
// Handle the error appropriately
}
} catch (IOException e) {
Log.e(TAG, "Failed to read the audio file", e);
} catch (URISyntaxException e) {
Log.e(TAG, "Invalid audio file", e);
}
// [END android_gemini_developer_api_multimodal_audio_input_java]
}
public static void textAndVideoInput(Executor executor, Application applicationContext, Uri videoUri) {
GenerativeModelFutures model = GeminiDeveloperApiFlashModelConfigurationJava.model;
// [START android_gemini_developer_api_multimodal_video_input_java]
ContentResolver resolver = applicationContext.getContentResolver();
try (InputStream stream = resolver.openInputStream(videoUri)) {
File videoFile = new File(new URI(videoUri.toString()));
int videoSize = (int) videoFile.length();
byte[] videoBytes = new byte[videoSize];
if (stream != null) {
stream.read(videoBytes, 0, videoBytes.length);
stream.close();
// Provide a prompt that includes video specified earlier and text
Content prompt = new Content.Builder()
.addInlineData(videoBytes, "video/mp4")
.addText("Describe the content of this video")
.build();
// To generate text output, call generateContent with the prompt
ListenableFuture<GenerateContentResponse> response = model.generateContent(prompt);
Futures.addCallback(response, new FutureCallback<GenerateContentResponse>() {
@Override
public void onSuccess(GenerateContentResponse result) {
String resultText = result.getText();
System.out.println(resultText);
}
@Override
public void onFailure(Throwable t) {
t.printStackTrace();
}
}, executor);
}
} catch (IOException e) {
e.printStackTrace();
} catch (URISyntaxException e) {
e.printStackTrace();
}
// [END android_gemini_developer_api_multimodal_video_input_java]
}
public static void multiTurnChat(Executor executor) {
GenerativeModelFutures model = GeminiDeveloperApiFlashModelConfigurationJava.model;
// [START android_gemini_developer_api_multiturn_chat_java]
Content.Builder userContentBuilder = new Content.Builder();
userContentBuilder.setRole("user");
userContentBuilder.addText("Hello, I have 2 dogs in my house.");
Content userContent = userContentBuilder.build();
Content.Builder modelContentBuilder = new Content.Builder();
modelContentBuilder.setRole("model");
modelContentBuilder.addText("Great to meet you. What would you like to know?");
Content modelContent = modelContentBuilder.build();
List<Content> history = Arrays.asList(userContent, modelContent);
// Initialize the chat
ChatFutures chat = model.startChat(history);
// Create a new user message
Content.Builder messageBuilder = new Content.Builder();
messageBuilder.setRole("user");
messageBuilder.addText("How many paws are in my house?");
Content message = messageBuilder.build();
// Send the message
ListenableFuture<GenerateContentResponse> response = chat.sendMessage(message);
Futures.addCallback(response, new FutureCallback<GenerateContentResponse>() {
@Override
public void onSuccess(GenerateContentResponse result) {
String resultText = result.getText();
System.out.println(resultText);
}
@Override
public void onFailure(Throwable t) {
t.printStackTrace();
}
}, executor);
// [END android_gemini_developer_api_multiturn_chat_java]
}
public static void generateImageFromText(Executor executor) {
GenerativeModelFutures model = GeminiFlashImageModelConfigurationJava.model;
// [START android_gemini_developer_api_generate_image_from_text_java]
// Provide a text prompt instructing the model to generate an image
Content prompt = new Content.Builder()
.addText("Generate an image of the Eiffel Tower with fireworks in the background.")
.build();
// To generate an image, call `generateContent` with the text input
ListenableFuture<GenerateContentResponse> response = model.generateContent(prompt);
Futures.addCallback(response, new FutureCallback<GenerateContentResponse>() {
@Override
public void onSuccess(GenerateContentResponse result) {
// iterate over all the parts in the first candidate in the result object
for (Part part : result.getCandidates().get(0).getContent().getParts()) {
if (part instanceof ImagePart) {
ImagePart imagePart = (ImagePart) part;
// The returned image as a bitmap
Bitmap generatedImageAsBitmap = imagePart.getImage();
break;
}
}
}
@Override
public void onFailure(Throwable t) {
t.printStackTrace();
}
}, executor);
// [END android_gemini_developer_api_generate_image_from_text_java]
}
public static void editImage(Executor executor, Resources resources) {
GenerativeModelFutures model = GeminiFlashImageModelConfigurationJava.model;
// [START android_gemini_developer_api_edit_image_java]
// Provide an image for the model to edit
Bitmap bitmap = BitmapFactory.decodeResource(resources, R.drawable.scones);
// Provide a text prompt instructing the model to edit the image
Content promptcontent = new Content.Builder()
.addImage(bitmap)
.addText("Edit this image to make it look like a cartoon")
.build();
// To edit the image, call `generateContent` with the prompt (image and text input)
ListenableFuture<GenerateContentResponse> response = model.generateContent(promptcontent);
Futures.addCallback(response, new FutureCallback<GenerateContentResponse>() {
@Override
public void onSuccess(GenerateContentResponse result) {
// iterate over all the parts in the first candidate in the result object
for (Part part : result.getCandidates().get(0).getContent().getParts()) {
if (part instanceof ImagePart) {
ImagePart imagePart = (ImagePart) part;
Bitmap generatedImageAsBitmap = imagePart.getImage();
break;
}
}
}
@Override
public void onFailure(Throwable t) {
t.printStackTrace();
}
}, executor);
// [END android_gemini_developer_api_edit_image_java]
}
public static void editImageWithChat(Executor executor, Resources resources) {
GenerativeModelFutures model = GeminiFlashImageModelConfigurationJava.model;
// [START android_gemini_developer_api_edit_image_chat_java]
// Provide an image for the model to edit
Bitmap bitmap = BitmapFactory.decodeResource(resources, R.drawable.scones);
// Initialize the chat
ChatFutures chat = model.startChat();
// Create the initial prompt instructing the model to edit the image
Content prompt = new Content.Builder()
.setRole("user")
.addImage(bitmap)
.addText("Edit this image to make it look like a cartoon")
.build();
// To generate an initial response, send a user message with the image and text prompt
ListenableFuture<GenerateContentResponse> response = chat.sendMessage(prompt);
// Extract the image from the initial response
ListenableFuture<Bitmap> initialRequest = Futures.transform(response,
result -> {
for (Part part : result.getCandidates().get(0).getContent().getParts()) {
if (part instanceof ImagePart) {
ImagePart imagePart = (ImagePart) part;
return imagePart.getImage();
}
}
return null;
}, executor);
// Follow up requests do not need to specify the image again
ListenableFuture<GenerateContentResponse> modelResponseFuture = Futures.transformAsync(
initialRequest,
generatedImage -> {
Content followUpPrompt = new Content.Builder()
.addText("But make it old-school line drawing style")
.build();
return chat.sendMessage(followUpPrompt);
}, executor);
// Add a final callback to check the reworked image
Futures.addCallback(modelResponseFuture, new FutureCallback<GenerateContentResponse>() {
@Override
public void onSuccess(GenerateContentResponse result) {
for (Part part : result.getCandidates().get(0).getContent().getParts()) {
if (part instanceof ImagePart) {
ImagePart imagePart = (ImagePart) part;
Bitmap generatedImageAsBitmap = imagePart.getImage();
break;
}
}
}
@Override
public void onFailure(Throwable t) {
t.printStackTrace();
}
}, executor);
// [END android_gemini_developer_api_edit_image_chat_java]
}
}