Asynchronous programming in Android

Asynchronous programming in Android can be done in various ways. Two of them are:

1. Using callback

2. Using coroutines

Below is the example of using callback:

Below is the example of using coroutine:

…

Note that suspend function can only be called either from a coroutine or from another suspend function.

Here GlobalScope implements CoroutineScope and launch is a coroutine builder which is an extension function of CoroutineScope.

Coroutine

A coroutine is an instance of suspendable computation. It is conceptually similar to a thread, in the sense that it takes a block of code to run that works concurrently with the rest of the code. However, a coroutine is not bound to any particular thread. It may suspend its execution in one thread and resume in another one.

Coroutines can be thought of as light-weight threads

// Sequentially executes doWorld followed by “Hello”

// Concurrently executes both sections

suspend fun doWorld() = coroutineScope { // this: CoroutineScope

Coroutine builder: launch, async => to use suspend function in normal function. Used to link normal function and suspending function.

Scoping function: coroutineScope, withContext

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