Complete Beginner's Guide to Jetpack Compose 🚀

What is Jetpack Compose?

Jetpack Compose is Android's modern UI toolkit that revolutionizes how we build Android apps. Instead of writing XML layouts, you describe your UI using Kotlin code in a declarative way.

Think of it this way: Instead of saying "how to build something step by step" (imperative), you simply describe "what you want" (declarative), and Compose figures out how to build it!

Why Choose Compose Over Traditional XML?

  • Less boilerplate code - Write UI faster
  • Everything in Kotlin - No switching between XML and Kotlin
  • Better animations and theming support
  • Easier state management
  • Live previews while coding

Understanding Composables

A Composable is simply a Kotlin function marked with @Composable that describes part of your UI.

Your First Composable

@Composable
fun WelcomeMessage() {
    Text("Welcome to Jetpack Compose!")
}

That's it! You just created your first UI component.


Essential Building Blocks

1. Text - Displaying Content

@Composable
fun TextExamples() {
    Column {
        Text("Simple text")
        Text(
            text = "Styled text",
            fontSize = 20.sp,
            fontWeight = FontWeight.Bold,
            color = Color.Blue
        )
    }
}

2. Button - User Interactions

@Composable
fun ButtonExample() {
    var clickCount by remember { mutableStateOf(0) }
    
    Button(
        onClick = { clickCount++ }
    ) {
        Text("Clicked $clickCount times")
    }
}

3. TextField - User Input

@Composable
fun InputExample() {
    var name by remember { mutableStateOf("") }
    
    Column {
        TextField(
            value = name,
            onValueChange = { name = it },
            label = { Text("Enter your name") }
        )
        Text("Hello, $name!")
    }
}

4. Image - Visual Content

@Composable
fun ImageExample() {
    Image(
        painter = painterResource(id = R.drawable.my_image),
        contentDescription = "Profile picture",
        modifier = Modifier
            .size(100.dp)
            .clip(CircleShape)
    )
}

Layout Components

Column - Vertical Arrangement

@Composable
fun VerticalLayout() {
    Column(
        horizontalAlignment = Alignment.CenterHorizontally,
        verticalArrangement = Arrangement.spacedBy(8.dp)
    ) {
        Text("Item 1")
        Text("Item 2")
        Text("Item 3")
    }
}

Row - Horizontal Arrangement

@Composable
fun HorizontalLayout() {
    Row(
        verticalAlignment = Alignment.CenterVertically,
        horizontalArrangement = Arrangement.SpaceBetween
    ) {
        Text("Left")
        Text("Center")
        Text("Right")
    }
}

Box - Stack Layout

@Composable
fun StackLayout() {
    Box {
        Image(painter = painterResource(R.drawable.background))
        Text(
            "Overlay text",
            modifier = Modifier.align(Alignment.Center)
        )
    }
}

Interactive Components

Checkbox and RadioButton

@Composable
fun SelectionExample() {
    var isChecked by remember { mutableStateOf(false) }
    var selectedOption by remember { mutableStateOf("Option 1") }
    
    Column {
        // Checkbox
        Row(verticalAlignment = Alignment.CenterVertically) {
            Checkbox(
                checked = isChecked,
                onCheckedChange = { isChecked = it }
            )
            Text("Accept terms and conditions")
        }
        
        // RadioButtons
        listOf("Option 1", "Option 2", "Option 3").forEach { option ->
            Row(verticalAlignment = Alignment.CenterVertically) {
                RadioButton(
                    selected = selectedOption == option,
                    onClick = { selectedOption = option }
                )
                Text(option)
            }
        }
    }
}

Switch and Slider

@Composable
fun ControlsExample() {
    var isEnabled by remember { mutableStateOf(true) }
    var volume by remember { mutableStateOf(50f) }
    
    Column {
        Row(verticalAlignment = Alignment.CenterVertically) {
            Text("Enable notifications")
            Switch(
                checked = isEnabled,
                onCheckedChange = { isEnabled = it }
            )
        }
        
        Text("Volume: ${volume.toInt()}")
        Slider(
            value = volume,
            onValueChange = { volume = it },
            valueRange = 0f..100f
        )
    }
}

Building Reusable Components

Custom Greeting Card

@Composable
fun GreetingCard(name: String, message: String) {
    Card(
        modifier = Modifier
            .fillMaxWidth()
            .padding(8.dp),
        elevation = CardDefaults.cardElevation(defaultElevation = 4.dp)
    ) {
        Column(
            modifier = Modifier.padding(16.dp)
        ) {
            Text(
                text = "Hello, $name!",
                style = MaterialTheme.typography.headlineSmall
            )
            Text(
                text = message,
                style = MaterialTheme.typography.bodyMedium,
                modifier = Modifier.padding(top = 4.dp)
            )
        }
    }
}

// Usage
@Composable
fun MyScreen() {
    Column {
        GreetingCard("Alice", "Welcome to our app!")
        GreetingCard("Bob", "Have a great day!")
    }
}

State Management

Understanding State

In Compose, state is any value that can change over time. When state changes, Compose automatically updates the UI.

@Composable
fun Counter() {
    // This state survives recomposition
    var count by remember { mutableStateOf(0) }
    
    Column(
        horizontalAlignment = Alignment.CenterHorizontally
    ) {
        Text(
            text = "Count: $count",
            style = MaterialTheme.typography.headlineMedium
        )
        
        Row {
            Button(onClick = { count-- }) {
                Text("-")
            }
            Spacer(modifier = Modifier.width(16.dp))
            Button(onClick = { count++ }) {
                Text("+")
            }
        }
    }
}

State Hoisting

Move state up to parent components for better reusability:

@Composable
fun StatefulCounter() {
    var count by remember { mutableStateOf(0) }
    StatelessCounter(count = count, onCountChange = { count = it })
}

@Composable
fun StatelessCounter(
    count: Int,
    onCountChange: (Int) -> Unit
) {
    Column(horizontalAlignment = Alignment.CenterHorizontally) {
        Text("Count: $count")
        Button(onClick = { onCountChange(count + 1) }) {
            Text("Increment")
        }
    }
}

Lists and Lazy Loading

LazyColumn for Vertical Lists

@Composable
fun ContactList() {
    val contacts = remember {
        (1..100).map { "Contact $it" }
    }
    
    LazyColumn {
        items(contacts) { contact ->
            ContactItem(contact)
        }
    }
}

@Composable
fun ContactItem(name: String) {
    Card(
        modifier = Modifier
            .fillMaxWidth()
            .padding(horizontal = 16.dp, vertical = 4.dp)
    ) {
        Row(
            modifier = Modifier.padding(16.dp),
            verticalAlignment = Alignment.CenterVertically
        ) {
            Icon(
                Icons.Default.Person,
                contentDescription = null,
                modifier = Modifier.size(40.dp)
            )
            Spacer(modifier = Modifier.width(16.dp))
            Text(name)
        }
    }
}

LazyRow for Horizontal Lists

@Composable
fun ImageGallery() {
    val images = remember { (1..10).map { "Image $it" } }
    
    LazyRow(
        contentPadding = PaddingValues(16.dp),
        horizontalArrangement = Arrangement.spacedBy(8.dp)
    ) {
        items(images) { image ->
            Card(
                modifier = Modifier.size(120.dp)
            ) {
                Box(
                    contentAlignment = Alignment.Center
                ) {
                    Text(image)
                }
            }
        }
    }
}

Navigation

Basic Navigation Setup

// In your MainActivity
@Composable
fun NavigationExample() {
    val navController = rememberNavController()
    
    NavHost(
        navController = navController,
        startDestination = "home"
    ) {
        composable("home") {
            HomeScreen(navController)
        }
        composable("detail/{itemId}") { backStackEntry ->
            val itemId = backStackEntry.arguments?.getString("itemId")
            DetailScreen(navController, itemId)
        }
    }
}

@Composable
fun HomeScreen(navController: NavController) {
    Column {
        Text("Home Screen")
        Button(
            onClick = { navController.navigate("detail/123") }
        ) {
            Text("Go to Detail")
        }
    }
}

@Composable
fun DetailScreen(navController: NavController, itemId: String?) {
    Column {
        Text("Detail Screen - Item: $itemId")
        Button(
            onClick = { navController.popBackStack() }
        ) {
            Text("Go Back")
        }
    }
}

App Structure with Scaffold

@Composable
fun MyApp() {
    var selectedTab by remember { mutableStateOf(0) }
    
    Scaffold(
        topBar = {
            TopAppBar(
                title = { Text("My App") },
                actions = {
                    IconButton(onClick = { /* Handle search */ }) {
                        Icon(Icons.Default.Search, contentDescription = "Search")
                    }
                }
            )
        },
        bottomBar = {
            NavigationBar {
                listOf("Home", "Profile", "Settings").forEachIndexed { index, title ->
                    NavigationBarItem(
                        selected = selectedTab == index,
                        onClick = { selectedTab = index },
                        icon = { Icon(Icons.Default.Home, contentDescription = title) },
                        label = { Text(title) }
                    )
                }
            }
        },
        floatingActionButton = {
            FloatingActionButton(
                onClick = { /* Handle FAB click */ }
            ) {
                Icon(Icons.Default.Add, contentDescription = "Add")
            }
        }
    ) { paddingValues ->
        // Main content
        Box(
            modifier = Modifier
                .fillMaxSize()
                .padding(paddingValues),
            contentAlignment = Alignment.Center
        ) {
            when (selectedTab) {
                0 -> Text("Home Content")
                1 -> Text("Profile Content")
                2 -> Text("Settings Content")
            }
        }
    }
}

Side Effects

LaunchedEffect for One-time Operations

@Composable
fun DataLoadingScreen() {
    var data by remember { mutableStateOf<List<String>>(emptyList()) }
    var isLoading by remember { mutableStateOf(true) }
    
    // This runs only once when the composable enters composition
    LaunchedEffect(Unit) {
        delay(2000) // Simulate API call
        data = listOf("Item 1", "Item 2", "Item 3")
        isLoading = false
    }
    
    if (isLoading) {
        Box(
            modifier = Modifier.fillMaxSize(),
            contentAlignment = Alignment.Center
        ) {
            CircularProgressIndicator()
        }
    } else {
        LazyColumn {
            items(data) { item ->
                Text(item, modifier = Modifier.padding(16.dp))
            }
        }
    }
}

rememberCoroutineScope for Event-triggered Operations

@Composable
fun SnackbarExample() {
    val snackbarHostState = remember { SnackbarHostState() }
    val coroutineScope = rememberCoroutineScope()
    
    Scaffold(
        snackbarHost = { SnackbarHost(snackbarHostState) }
    ) { paddingValues ->
        Column(
            modifier = Modifier
                .fillMaxSize()
                .padding(paddingValues),
            horizontalAlignment = Alignment.CenterHorizontally,
            verticalArrangement = Arrangement.Center
        ) {
            Button(
                onClick = {
                    coroutineScope.launch {
                        snackbarHostState.showSnackbar("Hello from Snackbar!")
                    }
                }
            ) {
                Text("Show Snackbar")
            }
        }
    }
}

Best Practices for Beginners

1. Start Simple

// Start with basic components
@Composable
fun SimpleGreeting() {
    Text("Hello World!")
}

2. Use Preview for Quick Testing

@Preview
@Composable
fun SimpleGreetingPreview() {
    SimpleGreeting()
}

3. Break Down Complex UIs

@Composable
fun ComplexScreen() {
    Column {
        HeaderSection()
        ContentSection()
        FooterSection()
    }
}

@Composable
private fun HeaderSection() {
    // Header content
}

@Composable
private fun ContentSection() {
    // Main content
}

@Composable
private fun FooterSection() {
    // Footer content
}

4. Use Meaningful Names

// Good
@Composable
fun UserProfileCard(user: User) { }

// Avoid
@Composable
fun Card1(data: Any) { }

Common Beginner Mistakes to Avoid

  1. Don't call side effects directly in composables

    // ❌ Wrong
    @Composable
    fun BadExample() {
        val data = fetchDataFromAPI() // This will run on every recomposition!
    }
    
    // ✅ Correct
    @Composable
    fun GoodExample() {
        var data by remember { mutableStateOf<String?>(null) }
        
        LaunchedEffect(Unit) {
            data = fetchDataFromAPI()
        }
    }
    
  2. Remember to use remember for state

    // ❌ Wrong - state will reset on recomposition
    @Composable
    fun BadCounter() {
        var count = mutableStateOf(0)
    }
    
    // ✅ Correct
    @Composable
    fun GoodCounter() {
        var count by remember { mutableStateOf(0) }
    }
    

🎯 Interview Questions & Answers

Basic Level Questions

Q1: What is Jetpack Compose?

Answer: Jetpack Compose is Android's modern UI toolkit that simplifies and accelerates UI development using Kotlin. It uses a declarative programming model where UI is described in code based on the current app state, eliminating the need for XML layouts.

Q2: What are the key benefits of using Jetpack Compose over traditional XML layouts?

Answer:

  • Less boilerplate code - More concise UI definitions
  • Single language - Everything in Kotlin, no XML switching
  • Better performance - Smart recomposition only updates changed parts
  • Enhanced animations and theming support
  • Easier state management with built-in reactive patterns
  • Live previews during development
  • Better testability with direct UI component testing

Q3: What is a Composable function? Provide an example.

Answer: A Composable function is a building block of UI in Jetpack Compose, annotated with @Composable that defines how a part of the UI should look and behave.

 

 

kotlin

@Composable
fun Greeting(name: String) {
    Text(
        text = "Hello, $name!",
        style = MaterialTheme.typography.headlineMedium
    )
}

Q4: What does the @Composable annotation do?

Answer: The @Composable annotation tells the Compose compiler that the function is used to describe UI. It enables:

  • Compose runtime to track the function for recomposition
  • Access to Compose-specific APIs like remember, LaunchedEffect
  • Participation in the composition lifecycle
  • Smart recomposition when dependencies change

Q5: What is recomposition in Jetpack Compose?

Answer: Recomposition is the process where Compose re-executes composable functions when their input data or state changes. It's Compose's way of updating the UI reactively.

 

 

kotlin

@Composable
fun Counter() {
    var count by remember { mutableStateOf(0) } // State
    
    Column {
        Text("Count: $count") // Recomposes when count changes
        Button(onClick = { count++ }) { // Triggers recomposition
            Text("Increment")
        }
    }
}

Intermediate Level Questions

Q6: Explain remember and mutableStateOf. What's the difference between remember and rememberSaveable?

Answer:

mutableStateOf: Creates observable state that triggers recomposition when changed remember: Preserves state across recompositions but loses it during configuration changes rememberSaveable: Preserves state across recompositions AND configuration changes (like screen rotation)

 

 

kotlin

@Composable
fun StateExample() {
    // Lost on configuration change
    var tempValue by remember { mutableStateOf("") }
    
    // Survives configuration changes
    var savedValue by rememberSaveable { mutableStateOf("") }
    
    Column {
        TextField(value = tempValue, onValueChange = { tempValue = it })
        TextField(value = savedValue, onValueChange = { savedValue = it })
    }
}

Q7: What is state hoisting? Why is it important?

Answer: State hoisting is moving state from a child composable to its parent, making the child stateless and more reusable.

Benefits:

  • Reusability - Stateless components can be used in different contexts
  • Testability - Easier to test stateless components
  • Single source of truth - State is managed in one place

 

 

kotlin

// Stateless (hoisted)
@Composable
fun Counter(count: Int, onIncrement: () -> Unit) {
    Column {
        Text("Count: $count")
        Button(onClick = onIncrement) { Text("Increment") }
    }
}

// Stateful (parent manages state)
@Composable
fun CounterParent() {
    var count by remember { mutableStateOf(0) }
    Counter(count = count, onIncrement = { count++ })
}

Q8: What is a Modifier in Compose? Give examples.

Answer: Modifier is used to decorate or add behavior to UI elements. It's a chainable object that can modify appearance, layout, behavior, and accessibility.

 

 

kotlin

@Composable
fun ModifierExample() {
    Text(
        "Styled Text",
        modifier = Modifier
            .fillMaxWidth()           // Layout
            .padding(16.dp)           // Spacing
            .background(Color.Blue)   // Appearance
            .clickable { /* click */ } // Behavior
            .semantics { contentDescription = "Clickable text" } // Accessibility
    )
}

Q9: What's the difference between Column and LazyColumn?

Answer:


 
Column LazyColumn
Composes all children immediately Composes only visible items
Suitable for small, static lists Ideal for large or dynamic lists
Not scrollable by default Built-in vertical scrolling
Better performance for few items Better performance for many items

 

 

kotlin

// Column - for small lists
@Composable
fun SmallList() {
    Column {
        repeat(5) { index ->
            Text("Item $index")
        }
    }
}

// LazyColumn - for large lists
@Composable
fun LargeList(items: List<String>) {
    LazyColumn {
        items(items) { item ->
            Text(item)
        }
    }
}

Q10: How do you handle navigation in Jetpack Compose?

Answer: Use Navigation Compose with NavController and NavHost:

 

 

kotlin

@Composable
fun NavigationExample() {
    val navController = rememberNavController()
    
    NavHost(navController, startDestination = "home") {
        composable("home") { 
            HomeScreen { navController.navigate("detail/123") }
        }
        composable("detail/{id}") { backStackEntry ->
            val id = backStackEntry.arguments?.getString("id")
            DetailScreen(id) { navController.popBackStack() }
        }
    }
}

Advanced Level Questions

Q11: What are Side Effects in Compose? Name the different types.

Answer: Side effects are operations that interact with the outside world and shouldn't run on every recomposition.

Types:

  1. LaunchedEffect - For suspend functions (API calls, timers)
  2. rememberCoroutineScope - For event-driven coroutines
  3. SideEffect - For non-suspend operations after recomposition
  4. DisposableEffect - For lifecycle management with cleanup
  5. derivedStateOf - For computed state optimization
  6. snapshotFlow - Converting Compose state to Flow

 

 

kotlin

@Composable
fun SideEffectsExample() {
    var data by remember { mutableStateOf<String?>(null) }
    val coroutineScope = rememberCoroutineScope()
    
    // LaunchedEffect - runs once
    LaunchedEffect(Unit) {
        data = fetchData()
    }
    
    // rememberCoroutineScope - for button clicks
    Button(
        onClick = {
            coroutineScope.launch {
                // Handle async operation
            }
        }
    ) {
        Text("Load Data")
    }
    
    // SideEffect - runs after every recomposition
    SideEffect {
        Log.d("Compose", "Recomposed successfully")
    }
}

Q12: Explain LaunchedEffect vs rememberCoroutineScope vs SideEffect.

Answer:


 
API When to Use Example
LaunchedEffect Suspend functions triggered by key changes API calls, timers when screen loads
rememberCoroutineScope Event-driven suspend functions Button clicks, user interactions
SideEffect Non-suspend operations after recomposition Logging, analytics tracking

 

 

kotlin

@Composable
fun ComparisonExample(userId: String) {
    var userData by remember { mutableStateOf<User?>(null) }
    val scope = rememberCoroutineScope()
    
    // LaunchedEffect - runs when userId changes
    LaunchedEffect(userId) {
        userData = repository.getUser(userId)
    }
    
    // rememberCoroutineScope - for button events
    Button(
        onClick = {
            scope.launch {
                repository.refreshUser(userId)
            }
        }
    ) { Text("Refresh") }
    
    // SideEffect - for logging
    SideEffect {
        analytics.track("UserScreenViewed", userId)
    }
}

Q13: How would you optimize performance in a large list with Compose?

Answer:

 

 

kotlin

@Composable
fun OptimizedLargeList(items: List<Item>) {
    LazyColumn(
        // 1. Use content padding instead of wrapping in padding modifier
        contentPadding = PaddingValues(16.dp),
        
        // 2. Specify item spacing
        verticalArrangement = Arrangement.spacedBy(8.dp),
        
        // 3. Use keys for better recomposition
        key = { item -> item.id }
    ) {
        items(items, key = { it.id }) { item ->
            // 4. Use stable data classes
            OptimizedItemCard(item = item)
        }
    }
}

// 5. Make item stable and minimize recomposition
@Composable
fun OptimizedItemCard(item: Item) {
    // 6. Use derivedStateOf for expensive calculations
    val formattedDate by remember(item.timestamp) {
        derivedStateOf {
            DateFormatter.format(item.timestamp)
        }
    }
    
    Card(modifier = Modifier.fillMaxWidth()) {
        Text(item.title)
        Text(formattedDate)
    }
}

// 7. Stable data class
@Stable
data class Item(
    val id: String,
    val title: String,
    val timestamp: Long
)

Q14: How do you integrate traditional Views with Compose?

Answer:

Using Views in Compose (AndroidView):

 

 

kotlin

@Composable
fun WebViewInCompose(url: String) {
    AndroidView(
        factory = { context ->
            WebView(context).apply {
                loadUrl(url)
            }
        },
        update = { webView ->
            webView.loadUrl(url)
        }
    )
}

Using Compose in Views (ComposeView):

 

 

xml

<!-- In XML layout -->
<androidx.compose.ui.platform.ComposeView
    android:id="@+id/compose_view"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

 

 

kotlin

// In Activity/Fragment
composeView.setContent {
    MyComposeContent()
}

Q15: What is Scaffold and how do you use it effectively?

Answer: Scaffold provides a standard Material Design layout structure with slots for common components.

 

 

kotlin

@Composable
fun MyAppScaffold() {
    var selectedTab by remember { mutableStateOf(0) }
    val snackbarHostState = remember { SnackbarHostState() }
    
    Scaffold(
        topBar = {
            TopAppBar(
                title = { Text("My App") },
                navigationIcon = {
                    IconButton(onClick = { /* drawer toggle */ }) {
                        Icon(Icons.Default.Menu, contentDescription = "Menu")
                    }
                },
                actions = {
                    IconButton(onClick = { /* search */ }) {
                        Icon(Icons.Default.Search, contentDescription = "Search")
                    }
                }
            )
        },
        bottomBar = {
            NavigationBar {
                tabs.forEachIndexed { index, tab ->
                    NavigationBarItem(
                        selected = selectedTab == index,
                        onClick = { selectedTab = index },
                        icon = { Icon(tab.icon, contentDescription = tab.title) },
                        label = { Text(tab.title) }
                    )
                }
            }
        },
        floatingActionButton = {
            FloatingActionButton(
                onClick = { /* FAB action */ }
            ) {
                Icon(Icons.Default.Add, contentDescription = "Add")
            }
        },
        snackbarHost = { SnackbarHost(snackbarHostState) }
    ) { paddingValues ->
        // Content respects all the bars
        ContentScreen(
            modifier = Modifier.padding(paddingValues)
        )
    }
}

Scenario-Based Questions

Q16: You have a screen with a form that has multiple input fields. How would you manage the state efficiently?

Answer:

 

 

kotlin

// Create a state holder
@Stable
data class FormState(
    val name: String = "",
    val email: String = "",
    val phone: String = "",
    val isValid: Boolean = false
)

class FormViewModel : ViewModel() {
    private val _formState = mutableStateOf(FormState())
    val formState: State<FormState> = _formState
    
    fun updateName(name: String) {
        _formState.value = _formState.value.copy(
            name = name,
            isValid = validateForm(_formState.value.copy(name = name))
        )
    }
    
    fun updateEmail(email: String) {
        _formState.value = _formState.value.copy(
            email = email,
            isValid = validateForm(_formState.value.copy(email = email))
        )
    }
    
    private fun validateForm(state: FormState): Boolean {
        return state.name.isNotBlank() && 
               state.email.contains("@") && 
               state.phone.isNotBlank()
    }
}

@Composable
fun FormScreen(viewModel: FormViewModel = viewModel()) {
    val formState by viewModel.formState
    
    Column {
        OutlinedTextField(
            value = formState.name,
            onValueChange = viewModel::updateName,
            label = { Text("Name") }
        )
        
        OutlinedTextField(
            value = formState.email,
            onValueChange = viewModel::updateEmail,
            label = { Text("Email") }
        )
        
        Button(
            onClick = { /* submit */ },
            enabled = formState.isValid
        ) {
            Text("Submit")
        }
    }
}

Q17: How would you implement pull-to-refresh in a LazyColumn?

Answer:

 

 

kotlin

@Composable
fun PullToRefreshList() {
    var isRefreshing by remember { mutableStateOf(false) }
    var items by remember { mutableStateOf(listOf<String>()) }
    val pullToRefreshState = rememberPullToRefreshState()
    
    // Handle refresh
    LaunchedEffect(pullToRefreshState.isRefreshing) {
        if (pullToRefreshState.isRefreshing) {
            isRefreshing = true
            delay(2000) // Simulate network call
            items = generateNewItems()
            isRefreshing = false
        }
    }
    
    Box(
        modifier = Modifier
            .fillMaxSize()
            .pullToRefresh(
                state = pullToRefreshState,
                isRefreshing = isRefreshing
            )
    ) {
        LazyColumn {
            items(items) { item ->
                ItemCard(item)
            }
        }
        
        PullToRefreshIndicator(
            refreshing = isRefreshing,
            state = pullToRefreshState,
            modifier = Modifier.align(Alignment.TopCenter)
        )
    }
}

Tips for Compose Interviews:

  1. Practice live coding - Be ready to write Composables on the spot
  2. Understand the lifecycle - Know when recomposition happens
  3. Performance matters - Always discuss optimization strategies
  4. State management - Be clear about state hoisting and ViewModels
  5.  

Next Steps

  1. Practice with simple projects - Build a todo list, calculator, or weather app
  2. Learn Material Design 3 components
  3. Explore animations with animate*AsState
  4. Study state management patterns
  5. Learn about testing Compose UIs

Resources


Happy Composing! 🎉 Remember, the best way to learn Compose is by building actual projects. Start small, experiment often, and don't be afraid to make mistakes!

Related Tutorials & Resources