Kotlin Programming Cookbook

How it works…

The doAsync returns a Java Future. In simple words, a Future is a proxy or a wrapper around an object that is not yet there. When the asynchronous operation is done, you can extract it. If you want to avoid working with Future, doAsync has a different construct that accepts an ExecutorService:

val executor = Executors.newScheduledThreadPool(5)doAsync(executorService = executor){    val result = URL("https://httpbin.org/get").readText()    uiThread {        toast(result)    }}

As we discussed, the uiThread block isn't executed if the activity is closing. The reason is that it doesn't hold a context instance, only a weak reference. So even if the block isn't finished, the context will not leak.