Edge TTS Android

Android system TTS engine built with Java + Rust on top of edge-tts-rust.

Features

• Android TextToSpeechService engine
• Material settings UI
• Microsoft Edge Read Aloud voices
• Rust JNI bridge with MP3-to-PCM decoding
• Multi-ABI split APK release workflow for GitHub Releases

Build

Prerequisites:

• Android SDK + NDK 30.0.14904198
• Rust toolchain
• cargo-ndk
• JDK 17 for Gradle

Build release APKs:

./gradlew assembleRelease

Optional release signing:

• For local builds, pass signing values via Gradle properties: -Pandroid.injected.signing.store.file=..., -Pandroid.injected.signing.store.password=..., -Pandroid.injected.signing.key.alias=..., -Pandroid.injected.signing.key.password=...

GitHub Actions signing secrets:

• ANDROID_RELEASE_KEYSTORE_BASE64
• ANDROID_RELEASE_STORE_PASSWORD
• ANDROID_RELEASE_KEY_ALIAS
• ANDROID_RELEASE_KEY_PASSWORD

The release workflow requires all signing secrets and fails fast if any are missing.

Gradle builds the Rust JNI library for:

• arm64-v8a
• armeabi-v7a
• x86_64

Install and use

1. Download the APK matching your device ABI from GitHub Releases.
2. Install the APK.
3. Open the app and refresh the voice list.
4. Save a default voice.
5. Open Android system TTS settings and select Edge TTS Engine.

Notes

• This is a network TTS engine. It does not provide offline voices.
• The service outputs PCM to Android's TTS framework after decoding upstream MP3 in Rust.