Trixnity is a multiplatform Matrix SDK written in Kotlin. You can write clients, bots, appservices and servers with it. This SDK supports JVM (also Android), JS and Native as targets for most modules. Ktor is used for the HTTP client/server and kotlinx.serialization for the serialization/deserialization.
Trixnity aims to be reactive, strongly typed, customizable and easy to use. You can register custom events and Trixnity will take care, that you can send and receive that type.
If you just want to implement a messenger without having to dive too deep into trixnity-client and Matrix, consider using trixnity-messenger.
You need help? Ask your questions in #trixnity:imbitbu.de.
Install the Android SDK and add a file named local.properties with the
following content in the project root:
sdk.dir=/path/to/android/sdk