Handling Accessibility Notifications & Dynamic UI Updates

private fun setParagraphText() {
    val paragraph = """
        Live regions allow dynamic content updates to be communicated to screen readers.
        This demo shows how different types of live regions interact with ongoing screen reader output.
    """.trimIndent()

    paragraphTextView.text = paragraph
}

private fun setSmallParagraphText() {
    val paragraph = """
        As TalkBack reads this paragraph, you will see a weather update appear above without interrupting this ongoing screen reader output.
    """.trimIndent()

    smallParagraphTextView.text = paragraph
}

private fun startDemo() {
    weatherCard.visibility = View.GONE
    errorCard.visibility = View.GONE

    val handler = Handler(Looper.getMainLooper())

    handler.postDelayed({ showErrorMessage("Simulated error occurred") }, 12000)
    handler.postDelayed({ updateWeather() }, 18000)
}

// Using live regions for dynamic content

class LiveRegionsActivity : AppCompatActivity() {

    private lateinit var weatherTextView: TextView
    private lateinit var errorTextView: TextView
    private lateinit var statusTextView: TextView

    private fun updateWeather() {
        val temperature = Random.nextInt(0, 40)
        weatherTextView.apply {
            text = "Current temperature: $temperature°C"
            accessibilityLiveRegion = View.ACCESSIBILITY_LIVE_REGION_POLITE
        }
    }

    private fun showErrorMessage(message: String) {
        errorTextView.apply {
            text = message
            accessibilityLiveRegion = View.ACCESSIBILITY_LIVE_REGION_ASSERTIVE
            visibility = View.VISIBLE
        }
    }

    @RequiresApi(Build.VERSION_CODES.O)
    private fun updateStatus() {
        val currentTime = LocalDateTime.now()
        val formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")
        val formattedTime = currentTime.format(formatter)

        statusTextView.apply {
            text = "Status updated at $formattedTime"
            accessibilityLiveRegion = View.ACCESSIBILITY_LIVE_REGION_POLITE
        }
    }
}