Firebase AI Logic を使用すると、デベロッパーは Google の生成 AI をアプリに安全かつ直接追加して開発を簡素化できます。また、ツールとプロダクトの統合により、本番環境への移行をスムーズに行うことができます。クライアント Android SDK を提供して、クライアント コードから Gemini API を直接統合して呼び出すことができます。これにより、バックエンドの必要性がなくなり、開発が簡素化されます。
API プロバイダ
Firebase AI Logic では、Gemini Developer API と Vertex AI Gemini API の Google Gemini API プロバイダを使用できます。
アプリケーションに適した API プロバイダを選択するには、ビジネスと技術の制約、Vertex AI と Google Cloud エコシステムの知識に基づいて判断します。Gemini Pro または Gemini Flash の統合を初めて使用するほとんどの Android デベロッパーは、Gemini Developer API から始めることをおすすめします。プロバイダを切り替えるには、モデルのコンストラクタでパラメータを変更します。
Kotlin
// For Vertex AI, use `backend = GenerativeBackend.vertexAI()`valmodel=Firebase.ai(backend=GenerativeBackend.googleAI()).generativeModel("gemini-2.5-flash")valresponse=model.generateContent("Write a story about a magic backpack");valoutput=response.text
Java
// For Vertex AI, use `backend = GenerativeBackend.vertexAI()`GenerativeModelfirebaseAI=FirebaseAI.getInstance(GenerativeBackend.googleAI()).generativeModel("gemini-2.5-flash");// Use the GenerativeModelFutures Java compatibility layer which offers// support for ListenableFuture and Publisher APIsGenerativeModelFuturesmodel=GenerativeModelFutures.from(firebaseAI);Contentprompt=newContent.Builder().addText("Write a story about a magic backpack.").build();ListenableFuture<GenerateContentResponse>response=model.generateContent(prompt);Futures.addCallback(response,newFutureCallback<GenerateContentResponse>(){@OverridepublicvoidonSuccess(GenerateContentResponseresult){StringresultText=result.getText();[...]}@OverridepublicvoidonFailure(Throwablet){t.printStackTrace();}},executor);
[[["わかりやすい","easyToUnderstand","thumb-up"],["問題の解決に役立った","solvedMyProblem","thumb-up"],["その他","otherUp","thumb-up"]],[["必要な情報がない","missingTheInformationINeed","thumb-down"],["複雑すぎる / 手順が多すぎる","tooComplicatedTooManySteps","thumb-down"],["最新ではない","outOfDate","thumb-down"],["翻訳に関する問題","translationIssue","thumb-down"],["サンプル / コードに問題がある","samplesCodeIssue","thumb-down"],["その他","otherDown","thumb-down"]],["最終更新日 2025-08-17 UTC。"],[],[],null,["# Gemini AI models\n\nThe Gemini Pro and Gemini Flash model families offer Android developers\nmultimodal AI capabilities, running inference in the cloud and processing image,\naudio, video, and text inputs in Android apps.\n\n- **Gemini Pro**: Gemini 2.5 Pro is Google's state-of-the-art thinking model, capable of reasoning over complex problems in code, math, and STEM, as well as analyzing large datasets, codebases, and documents using long context.\n- **Gemini Flash**: The Gemini Flash models deliver next-gen features and improved capabilities, including superior speed, built-in tool use, and a 1M token context window.\n\n| **Note:** This document covers the cloud-based Gemini AI models. For on-device inference, [check out the Gemini Nano documentation](/ai/gemini-nano).\n\nFirebase AI Logic\n-----------------\n\nFirebase AI Logic enables developers to securely and directly add Google's\ngenerative AI into their apps simplifying development, and offers tools and\nproduct integrations for successful production readiness. It provides client\nAndroid SDKs to directly integrate and call Gemini APIs from client code,\nsimplifying development by eliminating the need for a backend.\n\nAPI providers\n-------------\n\nFirebase AI Logic lets you use the following Google Gemini API providers:\nGemini *Developer API* and Vertex *AI Gemini API*.\n**Figure 1.** Firebase AI Logic integration architecture.\n\nHere are the primary differences for each API provider:\n\n[**Gemini Developer API**](/ai/gemini/developer-api):\n\n- Get started at no-cost with a generous free tier without payment information required.\n- Optionally upgrade to the paid tier of the Gemini Developer API to scale as your user base grows.\n- Iterate and experiment with prompts and even get code snippets using [Google AI Studio](https://aistudio.google.com/).\n\n[**Vertex AI Gemini API**](/ai/vertex-ai-firebase):\n\n- Granular control over [where you access the model](https://cloud.google.com/compute/docs/regions-zones).\n- Ideal for developers already embedded in the Vertex AI/Google Cloud ecosystem.\n- Iterate and experiment with prompts and even get code snippets using [Vertex AI Studio](https://cloud.google.com/vertex-ai/generative-ai/docs/start/quickstarts/quickstart).\n\nSelecting the appropriate API provider for your application is based on your\nbusiness and technical constraints, and familiarity with the Vertex AI and\nGoogle Cloud ecosystem. Most Android developers just getting started with Gemini\nPro or Gemini Flash integrations should begin with the Gemini Developer API.\nSwitching between providers is done by changing the parameter in the model\nconstructor: \n\n### Kotlin\n\n // For Vertex AI, use `backend = GenerativeBackend.vertexAI()`\n val model = Firebase.ai(backend = GenerativeBackend.googleAI())\n .generativeModel(\"gemini-2.5-flash\")\n\n val response = model.generateContent(\"Write a story about a magic backpack\");\n val output = response.text\n\n### Java\n\n // For Vertex AI, use `backend = GenerativeBackend.vertexAI()`\n GenerativeModel firebaseAI = FirebaseAI.getInstance(GenerativeBackend.googleAI())\n .generativeModel(\"gemini-2.5-flash\");\n\n // Use the GenerativeModelFutures Java compatibility layer which offers\n // support for ListenableFuture and Publisher APIs\n GenerativeModelFutures model = GenerativeModelFutures.from(firebaseAI);\n\n Content prompt = new Content.Builder()\n .addText(\"Write a story about a magic backpack.\")\n .build();\n\n ListenableFuture\u003cGenerateContentResponse\u003e response = model.generateContent(prompt);\n Futures.addCallback(response, new FutureCallback\u003cGenerateContentResponse\u003e() {\n @Override\n public void onSuccess(GenerateContentResponse result) {\n String resultText = result.getText();\n [...]\n }\n\n @Override\n public void onFailure(Throwable t) {\n t.printStackTrace();\n }\n }, executor);\n\nSee the full [list of available generative AI models](https://firebase.google.com/docs/vertex-ai/models) supported\nby Firebase AI Logic client SDKs.\n\nFirebase services\n-----------------\n\nIn addition to access to the Gemini API, Firebase AI Logic offers a set of\nservices to simplify the deployment of AI-enabled features to your app and get\nready for production:\n\n### App Check\n\n[Firebase App Check](https://firebase.google.com/docs/app-check) safeguards app backends from abuse by\nensuring only authorized clients access resources. It integrates with Google\nservices (including Firebase and Google Cloud) and custom backends. App Check\nuses [Play Integrity](/google/play/integrity) to verify that requests originate from the authentic\napp and an untampered device.\n\n### Remote Config\n\nInstead of hardcoding the model name in your app, we recommend using a\nserver-controlled variable using [Firebase Remote Config](https://firebase.google.com/docs/remote-config). This\nlets you dynamically update the model your app uses without having to deploy a\nnew version of your app or require your users to pick up a new version. You can\nalso use Remote Config to [A/B test](https://firebase.google.com/docs/ab-testing/abtest-config) models and prompts.\n\n### AI monitoring\n\nTo understand how your AI-enabled features are performing you can use the [AI\nmonitoring dashboard](https://firebase.google.com/docs/vertex-ai/monitoring) within the Firebase console. You'll get\nvaluable insights into usage patterns, performance metrics, and debugging\ninformation for your Gemini API calls.\n\nMigrate to Firebase AI Logic\n----------------------------\n\nIf you're already using the Vertex AI in Firebase SDK in your app, read the\n[migration guide](https://firebase.google.com/docs/vertex-ai/migrate-to-latest-sdk)."]]