What should you do if your application stops responding or the response time is too long for the user?

If the application stops responding or the response time is too long, you should:

• Check if a heavy operation is running on the main (UI) thread. In Android, long operations (network, database, calculations) should be performed in a background thread, for example, using coroutines, AsyncTask, or other means.
• Use asynchronous calls and show a loading indicator to the user so they understand that the application is working.
• Optimize code and queries to reduce execution time.
• Add timeouts and error handling so the application does not hang.

Example with coroutines:

lifecycleScope.launch {
    showLoading(true)
    val data = withContext(Dispatchers.IO) { fetchDataFromNetwork() }
    updateUI(data)
    showLoading(false)
}

Thus, the UI thread is not blocked, and the user sees a response.