import android.os.Handler
import android.os.Message

class MyCustomHandler(host: Host) : Handler() {

    private val host by WeakRef(host)

    interface Host {
        fun onCustomAction1(myData: ByteArray: String, myCustomArg: String)
    }

    override fun handleMessage(msg: Message) {
        when(msg.what) {
            "example_action_1" -> {
                val myData = msg.obj as ByteArray
                val customArg1 = msg.arg1 as String
                host?.onCustomAction1(myData, customArg1)
            }
        }
    }
}