Java Development Kit (JDK 17 or later) - Download from oracle.com or use a package manager
Android SDK - Install via Android Studio or command line tools
NDK (Native Development Kit) - Required for Rust compilation

Rust - Install from rustup.rs with Android targets:

rustup target add aarch64-linux-android armv7-linux-androideabi x86_64-linux-android i686-linux-android

Rust Analyzer for IDE support (optional but recommended)

Environment Variables

Set these environment variables:

# Windows (PowerShell)
$env:JAVA_HOME = "C:\Program Files\Java\jdk-17" # Adjust path as needed
$env:ANDROID_HOME = "$env:USERPROFILE\AppData\Local\Android\Sdk"
$env:NDK_HOME = "$env:ANDROID_HOME\ndk\25.2.9519653" # Adjust NDK version as needed

# macOS/Linux
export JAVA_HOME=/path/to/jdk-17
export ANDROID_HOME=$HOME/Android/Sdk
export NDK_HOME=$ANDROID_HOME/ndk/25.2.9519653

Initial Setup

Initialize the Android project:

pnpm init:android

Development & Testing

Start development server for Android:

pnpm dev:android

Build debug APK:

pnpm build:android

Install APK on connected device:

pnpm install:android

Ensure you have a device connected via USB with USB debugging enabled, or an Android emulator running.

Signing Release Builds

Android APKs must be signed with a digital certificate to be installable on devices. See the official Tauri Android signing documentation for detailed instructions.

Quick Summary:

Create a keystore using keytool (PKCS12 format is recommended over JKS):

keytool -genkey -v -keystore ~/upload-keystore.p12 -keyalg RSA -keysize 2048 -validity 10000 -alias upload -storetype PKCS12

Create a keystore.properties file at src-tauri/gen/android/keystore.properties:
```
password=<password from keytool>
keyAlias=upload
storeFile=<path to upload-keystore.p12>
```
Keep both the keystore and properties file private; don't commit them to version control.
Configure Gradle in src-tauri/gen/android/app/build.gradle.kts to use the signing key for release builds.

For CI/CD environments (e.g., GitHub Actions), use secrets to securely pass the keystore and credentials.

Testing Mobile Screen Size on Desktop

To test responsive design for mobile during development without deploying to a device:

Using Tauri Mobile Configuration:

Edit src-tauri/tauri.mobile.conf.json to adjust the window size for testing
Run pnpm dev:mobile to test with mobile-specific settings