[GDG Mien Trung - DevFest 2024] Build AI-Powered Apps with Gemini API using Vertex AI in Firebase

This is TechTalk session in DevFest 2024 organized by GDG Mien Trung.
Event link: https://gdg.community.dev/events/details/google-gdg-mientrung-presents-gdg-devfest-mientrung-2024/

We explored building AI-powered apps using Google's Gemini API and Vertex AI in Firebase. Here's a snapshot of what we covered:

🔹 Gemini API: Access advanced AI capabilities for text, images, video, and audio with powerful models like Gemini 1.5 Pro and the latest Gemini 2.0 Flash.
🔹 Integration Made Easy: Learn how to implement Gemini API with the Google AI Client SDK or Vertex AI through Firebase SDKs.
🔹 Prompt Design & Model Configurations: Master techniques for controlling AI output, designing effective prompts, and ensuring safety settings.
🔹 Why Vertex AI?: Ideal for secure, production-ready apps with seamless Firebase ecosystem integration.

1. Build AI-Powered Apps with Gemini API using Vertex AI in Firebase GDG MienTrung Hoàng Nguyễn - Technical Lead @ Nimble
2. Introduction to Gemini API and Vertex AI Gemini models capabilities and Use-cases Integrate Google AI client SDK vs Vertex AI in Firebase SDK Control output generation What We’ll Cover Today
3. Understanding Gemini models and Gemini API GDG MienTrung
4. GDG MienTrung What is Gemini models? 󰚒󰢦
5. Gemini 1.0 Pro Gemini 1.5 Pro Gemini 1.5 Flash Gemini 2.0 Flash Gemini models
6. ( 1 ) Gemini model variants and Use-cases gemini-1.0.pro (Deprecated on 15/02/2025): Natural language tasks, multi-turn text and code chat, and code generation ( 2 ) gemini-1.5-pro: Complex reasoning tasks requiring more intelligence ( 3 ) gemini-1.5-flash-8b: High volume and lower intelligence tasks
7. ( 4 ) Gemini model variants and Use-cases (cont.) gemini-1.5-flash: Fast and versatile performance across a diverse variety of tasks ( 5 ) gemini-2.0-flash-exp (Released on 11/12/2024): Next generation features, speed, and multimodal generation for a diverse variety of tasks
8. GDG MienTrung What is Gemini API? 󰚒󰢦
9. Gemini API Gemini API is a powerful tool that allows developers to access and utilize Google's advanced Gemini models. •Text •Images •Video •Audio •Documents
10. Generate text (text-only input) Generate text (multimodal input) Generate structured output (JSON) Multi-turn chat Gemini API capabilities Function calling
11. Gemini model capabilities GDG MienTrung
12. Supported input and output
13. Supported capabilities and general features
14. Supported capabilities and general features
15. Integrate Gemini API by using Google AI client SDK GDG MienTrung
16. Google AI integration architecture
17. Setup API Key
18. // build.gradle.kts (:app) dependencies { [...] implementation("com.google.ai.client.generativeai:generativeai:0.9.0") }
19. // ViewModel.kt val model = GenerativeModel( model = "gemini-1.5-flash", apiKey = BuildConfig.apikey, [...] )
20. // ViewModel.kt val prompt = "Write a story about a magic backpack." var response = "" generativeModel.generateContentStream(prompt).collect { chunk -> print(chunk.text) response += chunk.text }
21. Vertex AI in Firebase GDG MienTrung
22. •Text •Images •Video •Audio •Documents Gemini API using Vertex AI • It is a set of endpoints within the larger Vertex AI API surface: `apiplatform.googleapis.com` • For Vertex AI in Firebase SDKs, the total request size limit is 20 MB. (Alternative option is using Cloud Storage URLs)
23. Integrate Vertex AI in Firebase GDG MienTrung
24. Vertex AI in Firebase integration architecture
25. Setup Firebase project
26. // build.gradle.kts (:app) dependencies { [...] implementation("com.google.firebase:firebase-vertexai:16.0.2") }
27. // ApiKey is no longer needed to init model instance val model = Firebase.vertexAI.generativeModel( modelName = "gemini-1.5-flash", [...] )
28. Prompt design Model configuration Safety Settings System instructions Structured output using response schema Control content generation
29. GDG MienTrung What is Prompt design? 󰚒󰢦
30. GDG MienTrung “Prompt design is the process of creating prompts that elicit the desired response from language models.”
31. Task (Required) System instruction (Optional) Few-shot examples (Optional) Contextual information (Optional) Components of a prompt
32. Generate text (text-only input) val prompt = "Tell me about GDG DevFest" var response = "" generativeModel.generateContentStream(prompt).collect { chunk -> print(chunk.text) response += chunk.text }
34. Generate text (multimodal input) - Single image // Loads an image from the app/res/drawable/ directory val bitmap: Bitmap = BitmapFactory.decodeResource(resources, R.drawable.sparky) // Provide a prompt that includes the image specified above and text val prompt = content { image(bitmap) text("What developer tool is this mascot from?") } [...]
35. Generate text (multimodal input) - Multiple images // Loads an image from the app/res/drawable/ directory val bitmap1: Bitmap = BitmapFactory.decodeResource(resources, R.drawable.sparky) val bitmap2: Bitmap = BitmapFactory.decodeResource(resources, R.drawable.sparky_eats_pizza) // Provide a prompt that includes the images specified above and text val prompt = content { image(bitmap1) image(bitmap2) text("What's different between these pictures?") } [...]
36. Generate text (multimodal input) - Video val contentResolver = applicationContext.contentResolver contentResolver.openInputStream(videoUri).use { stream -> stream?.let { val bytes = stream.readBytes() // Provide a prompt that includes the video specified above and text val prompt = content { inlineData(bytes, "video/mp4") text("What is in the video?") } [...] }
37. Prompt design Model configuration and parameters Safety Settings System instructions Structured output using response schema Control content generation
38. // Model configuration val model = GenerativeModel( generationConfig = generationConfig { // [0..2] Higher temperature will make outputs more random and diverse temperature = 0.15f // [1..++] Lower top-k also concentrates sampling on the highest probability tokens for each step. Typically 50-100 topK = 32 // [0..1] Lower top-p values reduce diversity and focus on more probable tokens. topP = 1f [...] }, )
39. // Model configuration val model = GenerativeModel( [...] generationConfig = generationConfig { [...] // 1 token ~ 4 characters maxOutputTokens = 4096 [...] }, [...] )
40. Prompt design Model configuration Safety Settings System instructions Structured output using response schema Control content generation
41. // Safety Settings val model = GenerativeModel( [...] safetySettings = listOf( SafetySetting(HarmCategory.HARASSMENT, BlockThreshold.MEDIUM_AND_ABOVE), // HarmCategory(UNKNOWN, HARASSMENT, HATE_SPEECH, SEXUALLY_EXPLICIT, DANGEROUS_CONTENT) // BlockThreshold(UNSPECIFIED, LOW_AND_ABOVE, MEDIUM_AND_ABOVE, ONLY_HIGH, NONE) ) [...] )
42. Prompt design Model configuration Safety Settings System instructions Structured output using response schema Control content generation
43. // System instructions val model = GenerativeModel( [...] systemInstruction = content { text("Your name is Nobita. And I am Doraemon is talking to you") } )
45. Prompt design Model configuration Safety Settings System instructions Structured output using response schema Control content generation
46. // Structured output using response schema val config = generationConfig { responseMimeType = "application/json" responseSchema = [...] }
47. // Structured output using response schema responseSchema = Schema.arr( name = "characters", description = "List of characters", items = Schema.obj( name = "character", description = "A characters", contents = arrayOf( Schema.str("name", "Name of the character"), Schema.int("age", "Age of the character"), Schema.str("species", "Species of the character"), Schema.enum( name = "accessory", description = "Accessory of the character", values = listOf("hat", "glasses", "scarf"), ), [...]
49. Why migrate to use Vertex AI? GDG MienTrung
50. ( 1 ) Why migrate to use Vertex AI? Prototyping vs Production/Enterprise-scale: Google AI client SDKs are useful for getting started with the Gemini API and prototyping ( 2 ) Security features for mobile and web apps: Use Firebase AppCheck to verify API calls are from your actual app ( 3 ) Ecosystem built for mobile and web apps: Enhance integration such as Cloud Storage, Cloud Firestore, Remote Config for Firebase
51. Gemini API and Vertex AI capabilities Model configuration and parameters Prompt design and control output generation Recap
52. Q&A 󰚒󰢦 GDG MienTrung
53. Thank you 👋 󰳕 hoangnl.dev 🚀 GDG MienTrung