Adding a view to UI from Background Thread

MainActivity.kt

import android.content.Context
import android.os.Bundle
import android.os.Handler
import android.os.HandlerThread
import android.os.Message
import android.view.WindowManager
import android.widget.ImageView
import androidx.appcompat.app.AppCompatActivity

class MainActivity : AppCompatActivity() {

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

        val backgroundThread = HandlerThread("backgroundThread name")

        backgroundThread.start()

        val workerThreadHandler = Handler(backgroundThread.looper) {

            val imageView = ImageView(this)
            imageView.setImageResource(R.mipmap.ic_launcher)//Any image

            val windowManagerLayoutParams = WindowManager.LayoutParams()

            val windowManager = getSystemService(Context.WINDOW_SERVICE) as WindowManager
            windowManager.addView(imageView, windowManagerLayoutParams)

            return@Handler true
        }

        workerThreadHandler.sendMessage(Message.obtain())
    }

}