5 Jetpack Compose Components Every Beginner Should Know (With AI-Generated Examples)

If you're new to Jetpack Compose, you've probably felt overwhelmed. There are hundreds of components. Which ones actually matter for building real apps?

After generating 8 complete Android applications using AI, I've noticed something interesting: the same five components appear in almost every app. These aren't advanced patterns. These are the building blocks that make up roughly 80% of what you'll actually use.

Here are the five components that carry the weight, with concrete Kotlin examples.

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1. Column and Row — The Layout Foundation

Everything starts with layout. In Compose, you arrange UI elements vertically with Column and horizontally with Row.

Column(
    modifier = Modifier
        .fillMaxWidth()
        .padding(16.dp),
    verticalArrangement = Arrangement.spacedBy(8.dp)
) {
    Text("Username")
    TextField(value = "", onValueChange = {})
    Button(onClick = {}) {
        Text("Sign In")
    }
}

This declares three elements stacked vertically with 8dp spacing between them. The Column fills the full width and adds 16dp padding.

In Compose, you don't think in pixels or absolute positioning. You compose layouts declaratively — "I want these things stacked vertically, with this spacing" — and the system handles the rest.

Why beginners need this: It's the foundation. Almost every screen is built from nested Column and Row combinations. Master this first.

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2. Text — Typography and Material3

The humble Text component is where the Material3 design system becomes visible. Instead of hardcoding font sizes and colors, you use the theme.

Text(
    text = "Welcome back",
    style = MaterialTheme.typography.headlineLarge,
    color = MaterialTheme.colorScheme.onSurface
)

Compare this to a beginner's mistake:

// DON'T DO THIS
Text(
    text = "Welcome back",
    fontSize = 32.sp,
    color = Color.Black
)

The hardcoded version breaks dark mode and doesn't respect the app's design system. The theme-based version adapts automatically.

MaterialTheme.typography includes:

• displayLarge, displayMedium, displaySmall — for headlines
• headlineLarge, headlineMedium, headlineSmall — for section titles
• bodyLarge, bodyMedium, bodySmall — for paragraphs
• labelLarge, labelMedium, labelSmall — for buttons and chips

Why beginners need this: It's the difference between "this app looks generic" and "this app looks intentional." Embracing the theme system takes 10 seconds and completely changes how professional your UI looks.

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3. Button — Handling Click Events and State

Buttons introduce your first real interaction pattern.

var count by remember { mutableStateOf(0) }

Button(
    onClick = { count += 1 },
    modifier = Modifier.fillMaxWidth()
) {
    Text("Increment ($count)")
}

This declares a button that increments a counter when clicked. The remember { mutableStateOf() } pattern tells Compose: "Keep this value around even if this composable recomposes. When it changes, update the UI."

The button automatically recomposes and displays the new count. You don't manually update the UI — Compose does it.

There are also TextButton, OutlinedButton, and FilledTonalButton for different styles, but they follow the same pattern:

FilledTonalButton(onClick = { /* ... */ }) {
    Text("Submit")
}

TextButton(onClick = { /* ... */ }) {
    Text("Cancel")
}

Why beginners need this: This is where Compose's reactivity becomes tangible. Once you understand remember and mutableStateOf, you understand how the entire framework works.

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4. TextField — Handling User Input

Text input in Compose is more involved than it first appears, because you need to manage the input state yourself.

var email by remember { mutableStateOf("") }

TextField(
    value = email,
    onValueChange = { email = it },
    label = { Text("Email") },
    modifier = Modifier.fillMaxWidth(),
    keyboardOptions = KeyboardOptions(
        keyboardType = KeyboardType.Email,
        imeAction = ImeAction.Done
    )
)

This creates a text field that:

• Displays the current email state
• Updates the state when the user types
• Shows a label when empty
• Uses the email keyboard on Android (with @ and .com suggestions)
• Hides the keyboard when the user taps Done

A common beginner mistake is treating Compose like HTML forms, where the browser manages state. In Compose, you manage it. The TextField is just the display layer.

Why beginners need this: Input handling is not optional. Every practical app needs this pattern, and it's different enough from web development to trip up newcomers.

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5. LazyColumn — Efficient Lists

Lists are everywhere. But rendering 10,000 items at once crashes apps. LazyColumn solves this by only rendering items that are visible on screen.

val items = remember { mutableStateListOf(
    "Item 1", "Item 2", "Item 3", /* ... more items ... */
) }

LazyColumn(
    modifier = Modifier.fillMaxSize(),
    verticalArrangement = Arrangement.spacedBy(8.dp)
) {
    items(items.size) { index ->
        Card(
            modifier = Modifier
                .fillMaxWidth()
                .padding(16.dp)
        ) {
            Text(
                text = items[index],
                modifier = Modifier.padding(16.dp)
            )
        }
    }
}

This renders only the items visible on screen, plus a buffer for smooth scrolling. As you scroll, old items are recycled and new ones are rendered. Even with 100,000 items, it stays responsive.

Compare to a beginner's approach:

// DON'T DO THIS
Column {
    repeat(100000) { index ->
        Text(items[index])
    }
}

This tries to compose all 100,000 items at once and will crash or freeze.

There's also LazyRow for horizontal scrolling and LazyVerticalGrid for grids.

Why beginners need this: Performance isn't a "nice to have." Users notice lag immediately. LazyColumn is how you build lists that feel fast.

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How AI Uses These Together

Here's the interesting part: when I generate a complete app with Claude Code, these five components appear in combination constantly.

A typical habit tracker screen looks like this:

Column(
    modifier = Modifier
        .fillMaxSize()
        .padding(16.dp),
    verticalArrangement = Arrangement.spacedBy(16.dp)
) {
    // Header
    Text(
        "My Habits",
        style = MaterialTheme.typography.headlineLarge
    )

    // Input section
    var habitName by remember { mutableStateOf("") }
    TextField(
        value = habitName,
        onValueChange = { habitName = it },
        label = { Text("New habit") },
        modifier = Modifier.fillMaxWidth()
    )
    Button(
        onClick = { addHabit(habitName) },
        modifier = Modifier.fillMaxWidth()
    ) {
        Text("Add")
    }

    // List of habits
    LazyColumn(
        verticalArrangement = Arrangement.spacedBy(8.dp)
    ) {
        items(habits.size) { index ->
            Card {
                Row(
                    modifier = Modifier
                        .fillMaxWidth()
                        .padding(16.dp),
                    horizontalArrangement = Arrangement.SpaceBetween,
                    verticalAlignment = Alignment.CenterVertically
                ) {
                    Column {
                        Text(
                            habits[index].name,
                            style = MaterialTheme.typography.bodyLarge
                        )
                        Text(
                            "Streak: ${habits[index].streak}",
                            style = MaterialTheme.typography.bodySmall
                        )
                    }
                    Button(onClick = { updateStreak(index) }) {
                        Text("Done")
                    }
                }
            }
        }
    }
}

That's one complete, functional screen. And it uses:

• Column for layout
• Text with MaterialTheme.typography
• TextField for input
• Button for actions
• LazyColumn for the list
• Plus Row, Card, and Surface (which follow the same patterns)

This is what production Android apps look like in 2026. And AI now generates this structure automatically.

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Why This Matters

The real significance isn't that these components exist. It's that AI can recognize when to use them and compose them correctly without being told.

When I provide a prompt like "Create a habit tracking app with local storage and Material3 design," Claude Code produces this exact pattern. No hand-holding. No intermediate steps. The AI already knows:

• When a list needs LazyColumn instead of Column
• When a text field needs state management
• Which typography style fits which content
• How to combine these into working screens

This is the shift. You're no longer asking "how do I write this?" You're asking "is what the AI wrote appropriate for my needs?" — which is a much faster conversation.

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Build Your First App

My 8 app templates all use these components as their foundation. Each one is a complete, working Kotlin + Jetpack Compose project with Material3 design and Room database.

They range from simple utilities (unit converter, countdown timer) to practical tools (habit tracker, budget manager). Each one is a real app that users can install and use immediately.

I've published them on Gumroad as templates. You can see the complete source code before you buy — no paywalled code or surprise restrictions. Use them as a starting point, customize them for your needs, or just study how these five components fit together in real projects.

If you want to understand not just what these components do, but how they actually work together in practice, that's where they're useful.

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What's your first Compose project been like? Have you hit a wall with any of these components? Drop your questions in the comments.