Why Kotlin Coroutines are a blessing for Android devs

Transcript

1. Why Kotlin Coroutines are a blessing for Android devs
2. Hello I am Muhammad Zeeshan Shabbir. Android Enthusiast, 3+ years of software industry experience. Deeply passionate about SDLC and crafting amazing apps that can solve real world problem
3. History • First introduced by Simula 67 • Detach (Coroutine suspension statement). • Resume (Coroutine execution statement). • Multithreading • Still in use by C# and JavaScript • Back again with Kotlin coroutine.
4. What are Kotlin coroutines? Coroutines are basically light weight and much more efficient threads. Asynchronous code looks like classic synchronous code.
5. Synchronous and Asynchronous in Android?
7. Synchronous and Asynchronous? Synchronous: Wait for it to finish before moving on to another task Asynchronous: Move on to another task before it finishes. “xx frames dropped” -> ANR
8. Asynchronous options in Android? • Java Thread API • AsyncTasks • Android Serivces • Reactive Programming (Rxjava)
9. Java Thread APIs ▰ Can invoke deadlock. ▰ Difficult to manage for complicated use-cases.
10. AsyncTask ▰ Memory leaks ▰ Hard to use for complicated use-cases.
11. Rxjava ▰ Learning Curve. ▰ A lot of Callbacks. ▰ Too many operators, too large library. ▰ Exception handling & Readability.
13. How does coroutines work? With a few key functions like async, await, defer, computation coroutines quickly allow you to identify which parts of your code are suspendable, which are to be executed on another thread, where to send the result of an asynchronous computation.
14. Key Coroutine Concepts • Suspending functions • Coroutine context and Coroutine Scope • Coroutine Builders
15. Lighter than Threads Coroutines are lighter than threads in the sense that a high number of coroutines can be created and run concurrently without running out of memory
16. Example: Import kotlin coroutine dependenics. • implementation("org.jetbrains.kotlinx:kotlinx-co routines-core:1.1.1"). • implementation("org.jetbrains.kotlinx:kotlinx-co routines-android:1.1.1")
19. Why Coroutines are blessing? ▰ Provides much Flexibility, code can be written into easy to understand sequential way. ▰ Light weighted. ▰ No Callbacks hell. ▰ Chaining is very easy. ▰ Exception handling & Readability is better.
20. Why Coroutines are blessing?
21. Thanks You can reach me at zeeshan.shabbir79@gmail.com