MainActivity.kt

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    _binding = ActivitySingletonLeakBinding.inflate(layoutInflater)
    setContentView(binding.root)

    binding.button.setOnClickListener {
        coroutineScope.launch(Dispatchers.IO) {
            delay(500) // simulate API call
            withContext(Dispatchers.Main) {
                onError("An error occured")
            }
        }
    }
}

private fun onError(errorMessage: String) {
    DialogUtilLeak.getInstance(this).showError("News", errorMessage)
}