Summary

This chapter covered many interesting topics of practical concurrency in Kotlin. Let's do a recap of the key topics.

• Android applications will throw NetworkOnMainThreadException if a network request is done on the UI thread.
• Android applications can only update the UI on the UI thread, and trying to do it from a different thread will produce a CalledFromWrongThreadException.
• Network requests have to be done in a background thread. The information has to be sent to the UI thread for the views to be updated.
• A CoroutineDispatcher can be used to enforce a coroutine to run in a specific thread, or group of threads.
• One or many coroutines can be run in a thread by using launch or async.
• launch should be used in fire-and-forget scenarios, meaning cases where we aren't expecting the coroutine to return something.
• asyncshould be used when the coroutine will produce a result that will be processed. Usingasyncwithout handling its result can result in exceptions not being propagated.
• Kotlin has specific...