Handler Thread usage

handlerthreadusage.kt

class NQueensActivity : AppCompatActivity() {

    private val handlerThread = HandlerThread("NQueens").also { it.start() }
    private val handler = Handler(handlerThread.looper)
    private var queens = 1
  
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        solveButton.setOnClickListener {
            solveNQueens(queens)
        }
    }

    private fun solveNQueens(queens: Int) {
        handler.post {
            
            val positions = ... // Calculate possible queen positions
          
            Handler(mainLooper).post {
                renderUI(positions)
            }
          
        }
    }

    override fun onStop() {
        super.onStop()
        handlerThread.quitSafely()
    }
}