tts-rs/README.md

TTS-RS

This library provides a high-level Text-To-Speech (TTS) interface supporting various backends. Currently supported backends are:

• Windows
  • Screen readers/SAPI via Tolk (requires tolk Cargo feature)
  • WinRT
• Linux via Speech Dispatcher
• MacOS/iOS
  • AppKit on MacOS 10.13 and below
  • AVFoundation on MacOS 10.14 and above, and iOS
• Android
• WebAssembly

Android Setup

On most platforms, this library is plug-and-play. Because of JNI's complexity, Android setup is a bit more involved. In general, look to the Android example for guidance. Here are some rough steps to get going:

• Set up Cargo.toml as the example does. Be sure to depend on ndk-glue.
• Place Bridge.java appropriately in your app. This is needed to support various Android TTS callbacks.
• Create a main activity similar to MainActivity.kt. In particular, you need to derive android.app.NativeActivity, and you need a System.loadLibrary(...) call appropriate for your app. System.loadLibrary(...) is needed to trigger JNI_OnLoad.
• • Even though you've loaded the library in your main activity, add a metadata tag to your activity in AndroidManifest.xml referencing it. Yes, this is redundant but necessary.
• Set if your various build.gradle scripts to reference the plugins, dependencies, etc. from the example. In particular, you'll want to set up cargo-ndk-android-gradle and either depend on androidx.annotation or otherwise configure your app to keep the class rs.tts.Bridge.

And I think that should about do it. Good luck!