Android中如果使用Kotlin协程更新UI

现在有一个需求就是读取一个文本文件然后更新UI的TextView，使用协程方法如下：

override fun onOptionsItemSelected(item: MenuItem): Boolean {
        when (item.itemId) {
            R.id.action_about -> {
                showAboutWindow()
            }
        }
        return super.onOptionsItemSelected(item)
    }
private fun showAboutWindow()
    {
        CoroutineScope(Dispatchers.IO).launch {
            val lang = resources.configuration.locales.get(0).language
            val thanksFilename = String.format("thanks_%s.txt", if (lang == "zh") "zh" else "en")
            val stream = InputStreamReader(assets.open(thanksFilename))
            val thanks = stream.readText()
            stream.close()
            withContext(Dispatchers.Main) {
                try {
                    aboutWindow.contentView.findViewById<TextView>(R.id.tvThanks).text = thanks
                    aboutWindow.showAtLocation(binding.root, Gravity.CENTER, 0, 0)
                } catch (e: Exception) {
                    Log.d(TAG, e.toString())
                }
            }
        }
    }