16 Questions
What is a coroutine?
A concurrency design pattern used to simplify code that executes asynchronously.
When were coroutines added to Kotlin?
Version 1.3
How do coroutines help on Android?
They help manage long-running tasks and prevent the main thread from being blocked.
What is the recommended solution for asynchronous programming on Android?
Coroutines
What examples are provided in the topic about coroutines?
The examples make a network request and return the result to the main thread.
What is the purpose of the ViewModel Architecture component in relation to coroutines?
It calls the repository layer on the main thread to trigger network requests.
What can happen if a network request is made on the main thread in an Android app?
The app can freeze and potentially lead to an Application Not Responding (ANR) dialog.
What is the problem with the original makeLoginRequest function in the Repository class?
It is synchronous and blocks the calling thread, making it not main-safe.
What is the simplest solution to move the execution off the main thread for the network request in the ViewModel?
Create a new coroutine and execute the network request on an I/O thread.
Why is the withContext() function used from the coroutines library?
To move the execution of a coroutine to a different thread, making the calling function main-safe.
What is the purpose of marking makeLoginRequest with the suspend keyword?
To enforce it to be called from within a coroutine.
What happens if the ViewModel is destroyed while executing a coroutine started with viewModelScope?
viewModelScope is automatically cancelled, and all running coroutines are canceled as well.
Why is it important to use coroutines for main-safety in Android development?
To prevent blocking UI updates on the main thread.
What is the benefit of using the Dispatchers.IO withContext() in coroutines?
It moves the execution of the coroutine to an I/O thread, making the calling function main-safe.
What is the consequence of calling a suspend function from outside a coroutine?
It will result in a compilation error.
Why is it necessary to explicitly move the execution off the main thread when calling makeLoginRequest?
To ensure that the network request does not block the UI thread.
Explore the usage of coroutines in Android development with Kotlin 1.3, a concurrency design pattern that simplifies asynchronous code execution. Understand how coroutines can manage long-running tasks to prevent the main thread from becoming unresponsive.
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