Android Development with Jetpack Compose: Complete Guide

Jetpack Compose is Android's Future

Jetpack Compose has completely replaced XML layouts as the recommended way to build Android UIs. In 2026, it's mature, performant, and offers an incredible developer experience.

Getting Started

@Composable
fun ArticleCard(article: Article, onClick: () -> Unit) {
    Card(
        modifier = Modifier
            .fillMaxWidth()
            .clickable { onClick() }
            .padding(8.dp),
        elevation = CardDefaults.cardElevation(4.dp)
    ) {
        Column(modifier = Modifier.padding(16.dp)) {
            Text(
                text = article.title,
                style = MaterialTheme.typography.headlineSmall,
                fontWeight = FontWeight.Bold
            )
            Spacer(modifier = Modifier.height(8.dp))
            Text(
                text = article.excerpt,
                style = MaterialTheme.typography.bodyMedium,
                maxLines = 2,
                overflow = TextOverflow.Ellipsis
            )
        }
    }
}

State Management with ViewModel

class ArticlesViewModel : ViewModel() {
    private val _uiState = MutableStateFlow(ArticlesUiState())
    val uiState = _uiState.asStateFlow()
    
    fun loadArticles() {
        viewModelScope.launch {
            _uiState.update { it.copy(isLoading = true) }
            try {
                val articles = repository.getArticles()
                _uiState.update { it.copy(articles = articles, isLoading = false) }
            } catch (e: Exception) {
                _uiState.update { it.copy(error = e.message, isLoading = false) }
            }
        }
    }
}

Key Compose Patterns

• Unidirectional Data Flow - State flows down, events flow up
• Composition over Inheritance - Small, reusable composables
• Side Effects - Use LaunchedEffect, SideEffect correctly
• Remember & derivedStateOf - Optimize recomposition
• Lazy Lists - LazyColumn/LazyRow for efficient lists

Compose Multiplatform

With Compose Multiplatform, share UI code across Android, iOS, desktop, and web. This is the future of cross-platform Kotlin development.

Conclusion

Jetpack Compose is the definitive way to build Android UIs. Its declarative approach, combined with Kotlin's expressiveness, makes Android development more enjoyable than ever.