How to Build an Android App Using Google Antigravity (Step-by-Step Guide)

# Quick summary This guide shows how to build an Android app using Google Antigravity. The recommended stack: design UI in Google Stitch, generate an Expo React Native app (TypeScript) inside Antigravity using Gemini 3.8 Flash, preview with Expo Go, and produce an APK using Expo EAS. Supabase can be added later for cloud sync.

# Prerequisites

• A Google AI Pro subscription (to access Gemini inside Antigravity). If you already have Google One AI Premium, you can proceed.
• Google Antigravity installed on Mac or Windows.
• An Android phone with the Expo Go app installed.
• An Expo account (free signup).

# Workflow overview

1. 1Design UI in Google Stitch (or provide reference images).

1. 1Open Antigravity, create a project folder, and use the CLI plus chat interface.
2. 2Select Gemini 3.8 Flash High in Antigravity for generation.
3. 3Attach up to five UI reference images and instruct Antigravity to build an Expo React Native TypeScript app.
4. 4Preview the generated app in Expo Go.
5. 5Use Expo EAS to build an APK for installation and testing.
6. 6Optionally integrate Supabase for cloud synchronization.

# What each tool does

• Google Stitch: AI-first UI design tool similar to Figma for generating app screens or exporting references. The guide suggests exporting a ZIP because direct sharing to Antigravity can be unreliable.
• Google Antigravity: Agentic coding tool with CLI plus chat interface. The guide prefers the CLI workflow and recommends Gemini 3.8 Flash High model for code generation.
• Expo (React Native): Cross-platform builder used in the generated project so you can run the app on Android, iPhone, and web.
• Expo Go: Mobile app to preview Expo projects on a phone.
• Expo EAS: Build service to create APKs for installation.
• Supabase (optional): Cloud backend to add data sync features.

# Step-by-step highlights

• Stitch: Create or generate UI for an app (the guide uses a to-do list as a starting example). Select "app" mode, enter prompts, edit elements, preview prototype, and export.
• Antigravity setup: Open folder for the project, use the CLI with chat. Choose Gemini 3.8 Flash High. Attach UI images (up to five) and issue a clear prompt like "Please build an Expo React Native app in TypeScript based on the attached UI designs."
• Iteration: After Antigravity generates code, run the project locally or upload to Expo and preview with Expo Go to check navigation, components, and basic interactions. Fix errors via the chat/CLI loop.
• APK creation: Use Expo EAS to build a signed APK suitable for testing on devices.
• Supabase: If you want cloud-backed data, add Supabase for authentication and real-time sync after the core app runs locally.

# Practical cautions

• Exporting Stitch designs as ZIP is more reliable than direct sharing to Antigravity.

# Final note This approach prioritizes a low-code path for beginners using Google tools plus Expo. It focuses on a repeatable pipeline: generate UI, feed references to Antigravity, iterate on generated code, preview on device, and build an APK with EAS. Supabase is an optional next step for adding cloud features.