Learn Jetpack-compose - 8 Code Examples & CST Typing Practice Test

Jetpack Compose is Android’s modern toolkit for building native UI using Kotlin, offering a declarative approach to designing app interfaces and simplifying UI development for Android.

View all 8 Jetpack-compose code examples →

Jetpack Compose Simple Todo App Jetpack Compose Counter App Jetpack Compose Dark Mode Counter Jetpack Compose Multi Counter Jetpack Compose Auto Increment Counter Jetpack Compose Todo With Priority Jetpack Compose Countdown Timer Jetpack Compose Counter With Alert

Learn JETPACK-COMPOSE with Real Code Examples

Updated Nov 23, 2025

Explain

Jetpack Compose allows developers to define UI components in Kotlin code using a declarative syntax.

It replaces XML-based layouts, enabling more concise and reactive UI creation.

Compose emphasizes unidirectional data flow, state management, and integration with modern Android architecture components.

Core Features

Composable functions for UI elements

State management with remember, mutableStateOf, and StateFlow

Layouts like Column, Row, Box, LazyColumn

Material and custom design system support

Animation APIs for smooth UI transitions

Basic Concepts Overview

Composable: basic building block for UI

State: holds UI data that can change

Layouts: Column, Row, Box, LazyColumn, LazyRow

Modifiers: styling and positioning elements

Material components: Buttons, TextField, Scaffold, Snackbar

Project Structure

MainActivity.kt - entry point of the app

ui/ - folder for composable UI components

theme/ - color, typography, and shape theming

viewmodel/ - state management and business logic

data/ - repository or data source integration

Building Workflow

Define Composable functions for UI

Use state variables to manage dynamic data

Compose layouts using Column, Row, Box, Lazy lists

Apply Modifiers for padding, alignment, styling

Preview UI and deploy to device/emulator

Difficulty Use Cases

Beginner: basic layouts and text/buttons

Intermediate: forms and navigation

Advanced: complex state management with ViewModel

Expert: animations, gestures, and performance optimization

Community: integrating Compose with existing XML apps

Comparisons

Android-native focus vs cross-platform frameworks like Flutter/Titanium

Declarative UI vs XML layouts

Tightly integrated with Kotlin and Jetpack

Better state management vs traditional XML + LiveData

Best for modern, reactive Android apps

Versioning Timeline

2019 - Jetpack Compose announced at Google I/O

2020 - Compose alpha versions released

2021 - Compose 1.0 stable release

2022 - Compose 1.1 with material3 support

2025 - Compose 2.0 with performance and tooling enhancements

Glossary

Composable: reusable UI function

State: holds UI data

Modifier: styling and layout

LazyColumn/LazyRow: scrollable lists

Material: design system components

Code Sample Descriptions

Jetpack Compose Simple Todo App

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.*
import androidx.compose.foundation.text.*
import androidx.compose.material.*
import androidx.compose.runtime.*
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
        TodoApp()
        }
    }
}

@Composable
fun TodoApp() {
    var todos by remember { mutableStateOf(listOf<String>()) }
    var newTodo by remember { mutableStateOf("") }

    Column(modifier = Modifier.padding(16.dp)) {
        Row {
        TextField(value = newTodo, onValueChange = { newTodo = it }, modifier = Modifier.weight(1f))
        Spacer(modifier = Modifier.width(8.dp))
        Button(onClick = {
        if(newTodo.isNotBlank()) {
        todos = todos + newTodo
        newTodo = ""
        }
        }) {
        Text("Add")
        }
        }
        Spacer(modifier = Modifier.height(16.dp))
        Column {
        todos.forEach { todo -> Text(todo) }
        }
    }
}

Demonstrates a simple Jetpack Compose app with a Todo list, adding tasks, and displaying them using Composables and state management.

Let’s Try →

Jetpack Compose Counter App

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.*
import androidx.compose.material.*
import androidx.compose.runtime.*
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
        CounterApp()
        }
    }
}

@Composable
fun CounterApp() {
    var count by remember { mutableStateOf(0) }
    Column(modifier = Modifier.padding(16.dp), verticalArrangement = Arrangement.spacedBy(16.dp)) {
        Text("Counter: $count", style = MaterialTheme.typography.h4)
        Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
        Button(onClick = { count++ }) { Text("+") }
        Button(onClick = { count-- }) { Text("-") }
        Button(onClick = { count = 0 }) { Text("Reset") }
        }
    }
}

A simple counter app with increment, decrement, and reset buttons.

Let’s Try →

Jetpack Compose Dark Mode Counter

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.*
import androidx.compose.material.*
import androidx.compose.runtime.*
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
        DarkModeCounterApp()
        }
    }
}

@Composable
fun DarkModeCounterApp() {
    var count by remember { mutableStateOf(0) }
    var isDark by remember { mutableStateOf(false) }
    MaterialTheme(colors = if (isDark) darkColors() else lightColors()) {
        Column(modifier = Modifier.padding(16.dp), verticalArrangement = Arrangement.spacedBy(16.dp)) {
        Text("Counter: $count", style = MaterialTheme.typography.h4)
        Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
        Button(onClick = { count++ }) { Text("+") }
        Button(onClick = { count-- }) { Text("-") }
        Button(onClick = { count = 0 }) { Text("Reset") }
        }
        Button(onClick = { isDark = !isDark }) { Text("Toggle Theme") }
        }
    }
}

Counter app with light/dark theme toggle.

Let’s Try →

Jetpack Compose Multi Counter

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.*
import androidx.compose.material.*
import androidx.compose.runtime.*
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
        MultiCounterApp()
        }
    }
}

@Composable
fun MultiCounterApp() {
    var counters by remember { mutableStateOf(listOf(0, 0, 0)) }
    Column(modifier = Modifier.padding(16.dp), verticalArrangement = Arrangement.spacedBy(16.dp)) {
        counters.indices.forEach { i ->
        Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
        Text("Counter ${i+1}: ${counters[i]}", style = MaterialTheme.typography.h5)
        Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
        Button(onClick = { counters = counters.toMutableList().also { it[i]++ } }) { Text("+") }
        Button(onClick = { counters = counters.toMutableList().also { it[i]-- } }) { Text("-") }
        }
        }
        }
    }
}

Multiple independent counters in a single view.

Let’s Try →

Jetpack Compose Auto Increment Counter

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.*
import androidx.compose.material.*
import androidx.compose.runtime.*
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import kotlinx.coroutines.delay
import androidx.compose.runtime.LaunchedEffect

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
        AutoIncrementCounter()
        }
    }
}

@Composable
fun AutoIncrementCounter() {
    var count by remember { mutableStateOf(0) }
    var isRunning by remember { mutableStateOf(true) }
    LaunchedEffect(Unit) {
        while(true) {
        delay(1000)
        if(isRunning) count++
        }
    }
    Column(modifier = Modifier.padding(16.dp), verticalArrangement = Arrangement.spacedBy(16.dp)) {
        Text("Counter: $count", style = MaterialTheme.typography.h4)
        Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
        Button(onClick = { isRunning = !isRunning }) { Text(if(isRunning) "Pause" else "Resume") }
        Button(onClick = { count = 0 }) { Text("Reset") }
        }
    }
}

Counter that automatically increments every second.

Let’s Try →

Jetpack Compose Todo With Priority

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.*
import androidx.compose.foundation.text.*
import androidx.compose.material.*
import androidx.compose.runtime.*
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
        PriorityTodoApp()
        }
    }
}

@Composable
fun PriorityTodoApp() {
    var todos by remember { mutableStateOf(listOf<Pair<String,String>>()) }
    var task by remember { mutableStateOf("") }
    var priority by remember { mutableStateOf("") }
    Column(modifier = Modifier.padding(16.dp), verticalArrangement = Arrangement.spacedBy(16.dp)) {
        Row {
        TextField(value = task, onValueChange = { task = it }, modifier = Modifier.weight(1f), placeholder = { Text("Task") })
        TextField(value = priority, onValueChange = { priority = it }, modifier = Modifier.weight(1f), placeholder = { Text("Priority") })
        Button(onClick = {
        if(task.isNotBlank()) {
        todos = todos + (task to priority)
        task = ""; priority = ""
        }
        }) { Text("Add") }
        }
        Column {
        todos.forEach { Text("${it.first} (Priority: ${it.second})") }
        }
    }
}

Todo app where each task has a priority and displays it.

Let’s Try →

Jetpack Compose Countdown Timer

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.*
import androidx.compose.material.*
import androidx.compose.runtime.*
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import kotlinx.coroutines.delay
import androidx.compose.runtime.LaunchedEffect

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
        CountdownTimerApp()
        }
    }
}

@Composable
fun CountdownTimerApp() {
    var count by remember { mutableStateOf(10) }
    LaunchedEffect(Unit) {
        while(count > 0) { delay(1000); count-- }
    }
    Column(modifier = Modifier.padding(16.dp), verticalArrangement = Arrangement.spacedBy(16.dp)) {
        Text("Time: $count", style = MaterialTheme.typography.h4)
        Button(onClick = { count = 10 }) { Text("Reset") }
    }
}

Countdown timer starting from 10 seconds.

Let’s Try →

Jetpack Compose Counter With Alert

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.*
import androidx.compose.material.*
import androidx.compose.runtime.*
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import kotlinx.coroutines.launch

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
        AlertCounterApp()
        }
    }
}

@Composable
fun AlertCounterApp() {
    var count by remember { mutableStateOf(0) }
    val scaffoldState = rememberScaffoldState()
    val scope = rememberCoroutineScope()
    Scaffold(scaffoldState = scaffoldState) {
        Column(modifier = Modifier.padding(16.dp), verticalArrangement = Arrangement.spacedBy(16.dp)) {
        Text("Counter: $count", style = MaterialTheme.typography.h4)
        Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
        Button(onClick = {
        count++
        if(count == 10) scope.launch { scaffoldState.snackbarHostState.showSnackbar("Count reached 10!") }
        }) { Text("+") }
        Button(onClick = { count = 0 }) { Text("Reset") }
        }
        }
    }
}

Counter shows a Snackbar alert when it reaches 10.

Let’s Try →

Frequently Asked Questions about Jetpack-compose

What is Jetpack-compose?

Jetpack Compose is Android’s modern toolkit for building native UI using Kotlin, offering a declarative approach to designing app interfaces and simplifying UI development for Android.

What are the primary use cases for Jetpack-compose?

Native Android app development. Apps requiring reactive UI updates. Modernizing legacy Android apps. Enterprise Android apps with dynamic content. Rapid prototyping of Android interfaces

What are the strengths of Jetpack-compose?

Full native performance on Android. Modern declarative programming style. Tight integration with Kotlin and Android ecosystem. Reusable and modular composable components. Simplifies UI state handling and lifecycle management

What are the limitations of Jetpack-compose?

Android-only (no cross-platform support). Requires Kotlin knowledge. Still maturing compared to traditional XML-based UI. Limited community resources compared to older frameworks. May require refactoring legacy apps to adopt fully

How can I practice Jetpack-compose typing speed?

CodeSpeedTest offers 8+ real Jetpack-compose code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.

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Explain

Jetpack Compose allows developers to define UI components in Kotlin code using a declarative syntax.

It replaces XML-based layouts, enabling more concise and reactive UI creation.

Compose emphasizes unidirectional data flow, state management, and integration with modern Android architecture components.

Code Sample Descriptions

Jetpack Compose Simple Todo App

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.*
import androidx.compose.foundation.text.*
import androidx.compose.material.*
import androidx.compose.runtime.*
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
        TodoApp()
        }
    }
}

@Composable
fun TodoApp() {
    var todos by remember { mutableStateOf(listOf<String>()) }
    var newTodo by remember { mutableStateOf("") }

    Column(modifier = Modifier.padding(16.dp)) {
        Row {
        TextField(value = newTodo, onValueChange = { newTodo = it }, modifier = Modifier.weight(1f))
        Spacer(modifier = Modifier.width(8.dp))
        Button(onClick = {
        if(newTodo.isNotBlank()) {
        todos = todos + newTodo
        newTodo = ""
        }
        }) {
        Text("Add")
        }
        }
        Spacer(modifier = Modifier.height(16.dp))
        Column {
        todos.forEach { todo -> Text(todo) }
        }
    }
}

Demonstrates a simple Jetpack Compose app with a Todo list, adding tasks, and displaying them using Composables and state management.

Let’s Try →

Jetpack Compose Counter App

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.*
import androidx.compose.material.*
import androidx.compose.runtime.*
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
        CounterApp()
        }
    }
}

@Composable
fun CounterApp() {
    var count by remember { mutableStateOf(0) }
    Column(modifier = Modifier.padding(16.dp), verticalArrangement = Arrangement.spacedBy(16.dp)) {
        Text("Counter: $count", style = MaterialTheme.typography.h4)
        Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
        Button(onClick = { count++ }) { Text("+") }
        Button(onClick = { count-- }) { Text("-") }
        Button(onClick = { count = 0 }) { Text("Reset") }
        }
    }
}

A simple counter app with increment, decrement, and reset buttons.

Let’s Try →

Jetpack Compose Dark Mode Counter

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.*
import androidx.compose.material.*
import androidx.compose.runtime.*
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
        DarkModeCounterApp()
        }
    }
}

@Composable
fun DarkModeCounterApp() {
    var count by remember { mutableStateOf(0) }
    var isDark by remember { mutableStateOf(false) }
    MaterialTheme(colors = if (isDark) darkColors() else lightColors()) {
        Column(modifier = Modifier.padding(16.dp), verticalArrangement = Arrangement.spacedBy(16.dp)) {
        Text("Counter: $count", style = MaterialTheme.typography.h4)
        Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
        Button(onClick = { count++ }) { Text("+") }
        Button(onClick = { count-- }) { Text("-") }
        Button(onClick = { count = 0 }) { Text("Reset") }
        }
        Button(onClick = { isDark = !isDark }) { Text("Toggle Theme") }
        }
    }
}

Counter app with light/dark theme toggle.

Let’s Try →

Jetpack Compose Multi Counter

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.*
import androidx.compose.material.*
import androidx.compose.runtime.*
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
        MultiCounterApp()
        }
    }
}

@Composable
fun MultiCounterApp() {
    var counters by remember { mutableStateOf(listOf(0, 0, 0)) }
    Column(modifier = Modifier.padding(16.dp), verticalArrangement = Arrangement.spacedBy(16.dp)) {
        counters.indices.forEach { i ->
        Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
        Text("Counter ${i+1}: ${counters[i]}", style = MaterialTheme.typography.h5)
        Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
        Button(onClick = { counters = counters.toMutableList().also { it[i]++ } }) { Text("+") }
        Button(onClick = { counters = counters.toMutableList().also { it[i]-- } }) { Text("-") }
        }
        }
        }
    }
}

Multiple independent counters in a single view.

Let’s Try →

Jetpack Compose Auto Increment Counter

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.*
import androidx.compose.material.*
import androidx.compose.runtime.*
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import kotlinx.coroutines.delay
import androidx.compose.runtime.LaunchedEffect

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
        AutoIncrementCounter()
        }
    }
}

@Composable
fun AutoIncrementCounter() {
    var count by remember { mutableStateOf(0) }
    var isRunning by remember { mutableStateOf(true) }
    LaunchedEffect(Unit) {
        while(true) {
        delay(1000)
        if(isRunning) count++
        }
    }
    Column(modifier = Modifier.padding(16.dp), verticalArrangement = Arrangement.spacedBy(16.dp)) {
        Text("Counter: $count", style = MaterialTheme.typography.h4)
        Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
        Button(onClick = { isRunning = !isRunning }) { Text(if(isRunning) "Pause" else "Resume") }
        Button(onClick = { count = 0 }) { Text("Reset") }
        }
    }
}

Counter that automatically increments every second.

Let’s Try →

Jetpack Compose Todo With Priority

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.*
import androidx.compose.foundation.text.*
import androidx.compose.material.*
import androidx.compose.runtime.*
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
        PriorityTodoApp()
        }
    }
}

@Composable
fun PriorityTodoApp() {
    var todos by remember { mutableStateOf(listOf<Pair<String,String>>()) }
    var task by remember { mutableStateOf("") }
    var priority by remember { mutableStateOf("") }
    Column(modifier = Modifier.padding(16.dp), verticalArrangement = Arrangement.spacedBy(16.dp)) {
        Row {
        TextField(value = task, onValueChange = { task = it }, modifier = Modifier.weight(1f), placeholder = { Text("Task") })
        TextField(value = priority, onValueChange = { priority = it }, modifier = Modifier.weight(1f), placeholder = { Text("Priority") })
        Button(onClick = {
        if(task.isNotBlank()) {
        todos = todos + (task to priority)
        task = ""; priority = ""
        }
        }) { Text("Add") }
        }
        Column {
        todos.forEach { Text("${it.first} (Priority: ${it.second})") }
        }
    }
}

Todo app where each task has a priority and displays it.

Let’s Try →

Jetpack Compose Countdown Timer

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.*
import androidx.compose.material.*
import androidx.compose.runtime.*
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import kotlinx.coroutines.delay
import androidx.compose.runtime.LaunchedEffect

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
        CountdownTimerApp()
        }
    }
}

@Composable
fun CountdownTimerApp() {
    var count by remember { mutableStateOf(10) }
    LaunchedEffect(Unit) {
        while(count > 0) { delay(1000); count-- }
    }
    Column(modifier = Modifier.padding(16.dp), verticalArrangement = Arrangement.spacedBy(16.dp)) {
        Text("Time: $count", style = MaterialTheme.typography.h4)
        Button(onClick = { count = 10 }) { Text("Reset") }
    }
}

Countdown timer starting from 10 seconds.

Let’s Try →

Jetpack Compose Counter With Alert

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.*
import androidx.compose.material.*
import androidx.compose.runtime.*
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import kotlinx.coroutines.launch

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
        AlertCounterApp()
        }
    }
}

@Composable
fun AlertCounterApp() {
    var count by remember { mutableStateOf(0) }
    val scaffoldState = rememberScaffoldState()
    val scope = rememberCoroutineScope()
    Scaffold(scaffoldState = scaffoldState) {
        Column(modifier = Modifier.padding(16.dp), verticalArrangement = Arrangement.spacedBy(16.dp)) {
        Text("Counter: $count", style = MaterialTheme.typography.h4)
        Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
        Button(onClick = {
        count++
        if(count == 10) scope.launch { scaffoldState.snackbarHostState.showSnackbar("Count reached 10!") }
        }) { Text("+") }
        Button(onClick = { count = 0 }) { Text("Reset") }
        }
        }
    }
}

Counter shows a Snackbar alert when it reaches 10.

Let’s Try →

Frequently Asked Questions about Jetpack-compose

What is Jetpack-compose?

Jetpack Compose is Android’s modern toolkit for building native UI using Kotlin, offering a declarative approach to designing app interfaces and simplifying UI development for Android.

What are the primary use cases for Jetpack-compose?

Native Android app development. Apps requiring reactive UI updates. Modernizing legacy Android apps. Enterprise Android apps with dynamic content. Rapid prototyping of Android interfaces

What are the strengths of Jetpack-compose?

What are the limitations of Jetpack-compose?

How can I practice Jetpack-compose typing speed?

CodeSpeedTest offers 8+ real Jetpack-compose code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.

Learn Jetpack-compose - 8 Code Examples & CST Typing Practice Test

Learn JETPACK-COMPOSE with Real Code Examples

Explain

Core Features

Basic Concepts Overview

Project Structure

Building Workflow

Difficulty Use Cases

Comparisons

Versioning Timeline

Glossary

Installation Setup

Environment Setup

Config Files

Cli Commands

Internationalization

Accessibility

Ui Styling

State Management

Data Management

Architecture

Rendering Model

Architectural Patterns

Real World Architectures

Design Principles

Scalability Guide

Migration Guide

Performance Notes

Security Notes

Monitoring Analytics

Code Quality

Practical Examples

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Final Summary

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Code Sample Descriptions

Jetpack Compose Simple Todo App

Jetpack Compose Counter App

Jetpack Compose Dark Mode Counter

Jetpack Compose Multi Counter

Jetpack Compose Auto Increment Counter

Jetpack Compose Todo With Priority

Jetpack Compose Countdown Timer

Jetpack Compose Counter With Alert

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Explain

Core Features

Basic Concepts Overview

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Versioning Timeline

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