In my project I have a module(ktor server project).
I need to start the server when app launch. What I tried and my codes are below.

MainActivity.kt

class MainActivity : AppCompatActivity() {

private val ktorServer = KtorServer()

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_camera)

    ktorServer.startServer()
}

override fun onDestroy() {
    super.onDestroy()
    ktorServer.stopServer()
}
}

KtorServer.kt

class KtorServer {

private var server: ApplicationEngine? = null

fun startServer() {
    server = embeddedServer(Netty, port = 8080) {
        module()
    }.start(wait = false)
//embeddedServer(Netty, port = 8080,host = "127.0.0.1", module = Application::module).start(wait = false)
}

private fun Application.module() {
    routing {
        get("/") {
            call.respondText("Hello, Ktor!", ContentType.Text.Plain)
        }
    }
}

fun stopServer() {
    server?.stop(1000, 10000)
}
}

build.gradle

def ktor_version = '2.0.0'
implementation("io.ktor:ktor-server-core:$ktor_version")
implementation("io.ktor:ktor-server-netty:$ktor_version")
implementation("io.ktor:ktor-server-content-negotiation:$ktor_version")
implementation("io.ktor:ktor-serialization-kotlinx-json:$ktor_version")