Video by Master Coding via YouTube
Source

👉👉👉 Check out my Udemy courses here:
📌 The Complete Android 15 Course [Part 1]-Master Java & Kotlin
https://www.udemy.com/course/the-complete-android-10-developer-course-mastering-android/?couponCode=MASTERCODING4

📌 The Complete Android 15 Course [Part 2] – Jetpack Compose
https://www.udemy.com/course/android15-developer-course-part2/?couponCode=MASTERCODING4

🚀🚀🚀 What You’ll Learn in This Video 🚀🚀
📌📌 State management in Jetpack Compose is crucial for creating responsive and interactive UI components. Unlike the traditional View-based system, Jetpack Compose follows a declarative UI paradigm, meaning the UI is rebuilt in response to state changes rather than being modified imperatively.

1️⃣ Remember API
Jetpack Compose provides the remember function to retain state across recompositions:
var count by remember { mutableStateOf(0) }
remember {} ensures the state is retained across recompositions.

mutableStateOf(0) creates a mutable state that triggers recomposition when changed.

2️⃣ rememberSaveable for Persistence
If you want to persist state across configuration changes (e.g., screen rotation), use rememberSaveable:
var count by rememberSaveable { mutableStateOf(0) }
This works with types that support Bundle serialization.

3️⃣ State Hoisting (Lifting State Up)
Instead of managing state within a composable, it’s a best practice to lift state up to the parent:

@Composable
fun Counter(count: Int, onIncrement: () — Unit) {
Button(onClick = onIncrement) {
Text("Count: $count")
}
}
@Composable
fun CounterScreen() {
var count by remember { mutableStateOf(0) }
Counter(count) { count++ }
}

4️⃣ ViewModel for State Management
For long-lived state, such as data fetching from Firestore, use ViewModel:

class CounterViewModel : ViewModel() {
private val _count = MutableStateFlow(0) // StateFlow for Compose compatibility
val count: StateFlow (Int) = _count

fun increment() {
_count.value++
}
}

@Composable
fun CounterScreen(viewModel: CounterViewModel = viewModel()) {
val count by viewModel.count.collectAsState()
Counter(count, onIncrement = { viewModel.increment() })
}

StateFlow (or LiveData) ensures state survives process death and recompositions.

5️⃣ DerivedStateOf for Performance Optimization
If a state depends on another state, use derivedStateOf to avoid unnecessary recompositions:
val isEven by remember { derivedStateOf { count % 2 == 0 } }

📌📌 Don’t just watch—take action! Start your journey today and join thousands of students who’ve transformed their careers with my courses. Let’s build something amazing together!

👍 If you found this video helpful, please give it a thumbs up, share it with your friends, and subscribe to my channel for more tutorials like this!

🔔 Turn on the notification bell so you never miss an update.

#AndroidStudio #AndroidDevelopment #LearnToCode #UdemyCourses #AppDevelopment #ProgrammingTutorial

Go to Source