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A coroutine is a concurrency design pattern that you can use onAndroid to simplify code that executes asynchronously.Coroutines were added to Kotlin in version 1.3 and are based on establishedconcepts from other languages.

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On Android, coroutines help to manage long-running tasks that mightotherwise block the main thread and cause your app to become unresponsive.Over 50% of professional developers who use coroutines have reported seeingincreased productivity.This topic describes how you can use Kotlin coroutines to address theseproblems, enabling you to write cleaner and more concise app code.

Features

Coroutines is our recommended solution for asynchronous programming onAndroid. Noteworthy features include the following:

• Lightweight: You can run many coroutines on a single thread due tosupport forsuspension,which doesn't block the thread where the coroutine is running. Suspendingsaves memory over blocking while supporting many concurrent operations.
• Fewer memory leaks: Usestructured concurrency to run operations within a scope.
• Built-in cancellation support:Cancellation is propagated automatically through the running coroutine hierarchy.
• Jetpack integration: Many Jetpack libraries includeextensions that provide full coroutines support. Somelibraries also provide their owncoroutine scope that you canuse for structured concurrency.

Examples overview

Based on the Guide to app architecture, the examplesin this topic make a network request and return the result to the mainthread, where the app can then display the result to the user.

Specifically, the ViewModelArchitecture component calls the repository layer on the main thread totrigger the network request. This guide iterates through various solutionsthat use coroutines keep the main thread unblocked.

ViewModel includes a set of KTX extensions that work directly withcoroutines. These extension arelifecycle-viewmodel-ktx library and are usedin this guide.

Dependency info

To use coroutines in your Android project, add the following dependencyto your app's build.gradle file:

Executing in a background thread

Making a network request on the main thread causes it to wait, or block,until it receives a response. Since the thread is blocked, the OS isn'table to call onDraw(), which causes your app to freeze and potentiallyleads to an Application Not Responding (ANR) dialog. For a better userexperience, let's run this operation on a background thread. Java edition account.

First, let's take a look at our Repository class and see how it'smaking the network request:

makeLoginRequest is synchronous and blocks the calling thread. To modelthe response of the network request, we have our own Result Update from mountain lion to mojave. class.

The ViewModel triggers the network request when the user clicks, forexample, on a button:

With the previous code, LoginViewModel is blocking the UI thread whenmaking the network request. The simplest solution to move the executionoff the main thread is to create a new coroutine and execute the networkrequest on an I/O thread: Hp 8610 scan software.

Let's dissect the coroutines code in the login function:

• viewModelScope is a predefined CoroutineScope that is included withthe ViewModel KTX extensions. Note that all coroutines must run in ascope. A CoroutineScope manages one or more related coroutines.
• launch is a function that creates a coroutine and dispatches theexecution of its function body to the corresponding dispatcher.
• Dispatchers.IO indicates that this coroutine should be executed on athread reserved for I/O operations.

The login function is executed as follows:

• The app calls the login function from the View layer on the main thread.
• launch creates a new coroutine, and the network request is madeindependently on a thread reserved for I/O operations.
• While the coroutine is running, the login function continues executionand returns, possibly before the network request is finished. Note thatfor simplicity, the network response is ignored for now.

Since this coroutine is started with viewModelScope, it is executed inthe scope of the ViewModel. If the ViewModel is destroyed because theuser is navigating away from the screen, viewModelScope is automaticallycancelled, and all running coroutines are canceled as well.

One issue with the previous example is that anything callingmakeLoginRequest needs to remember to explicitly move the execution offthe main thread. Let's see how we can modify the Repository to solvethis problem for us.

Use coroutines for main-safety

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We consider a function main-safe when it doesn't block UI updates on themain thread. The makeLoginRequest function is not main-safe, as callingmakeLoginRequest from the main thread does block the UI. Use thewithContext() function from the coroutines library to move the executionof a coroutine to a different thread:

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withContext(Dispatchers.IO) moves the execution of the coroutine to anI/O thread, making our calling function main-safe and enabling the UI toupdate as needed.

makeLoginRequest is also marked with the suspend keyword. This keywordis Kotlin's way to enforce a function to be called from within a coroutine.

http://nmpvtnf.xtgem.com/Blog/__xtblog_entry/19448152-uad-authorization-crack#xt_blog. In the following example, the coroutine is created in the LoginViewModel.As makeLoginRequest moves the execution off the main thread, the coroutinein the login function can be now executed in the main thread:

Note that the coroutine is still needed here, since makeLoginRequest isa suspend function, and all suspend What program is needed to view pdf files. functions must be executed ina coroutine.

This code differs from the previous login example in a couple of ways:

• launch doesn't take a Dispatchers.IO parameter. When you don'tpass a Dispatcher to launch, any coroutines launched fromviewModelScope run in the main thread.
• The result of the network request is now handled to display the successor failure UI.

The login function now executes as follows:

• The app calls the login() function from the View layer on the main thread.
• launch creates a new coroutine to make the network request on the mainthread, and the coroutine begins execution.
• Within the coroutine, the call to loginRepository.makeLoginRequest()now suspends further execution of the coroutine until the withContextblock in makeLoginRequest() finishes running.
• Once the withContext block finishes, the coroutine in login() resumesexecution on the main thread with the result of the network request.

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Handling exceptions

To handle exceptions that the Repository layer can throw, use Kotlin'sbuilt-in support for exceptions.In the following example, we use a try-catch block:

In this example, any unexpected exception thrown by the makeLoginRequest()call is handled as an error in the UI.

Additional coroutines resources

For a more detailed look at coroutines on Android, seeImprove app performance with Kotlin coroutines.

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For more coroutines resources, see the following links: