Google I/O session covering how to build intelligent Android apps using on-device and cloud AI. Demonstrates seven features built into a sample travel app (Jetpacker): trip summarization and receipt scanning with Gemini Nano 4 on-device, a museum chatbot using Gemini Flash via Firebase AI Logic with URL/Maps/web grounding, hybrid inference routing between on-device and cloud models, a multi-agent cloud booking system using Google's Agent Development Kit (ADK) with AGUI and A2UI protocols for agent-to-UI communication, and an experimental on-device agentic system using the newly released ADK for Android (v0.1). Key APIs covered include MLKit GenAI Prompt API, Firebase AI Logic SDK, structured output API (preview), AGUI protocol, A2UI renderer for Jetpack Compose, and ADK for Android.