Kotlin Android Development

Kotlin Android Development

Building Android apps with Kotlin — from Jetpack Compose and coroutines through MVVM architecture, Room database, and Play Store deployment.

When to Use

• Building native Android applications
• Modern UI with Jetpack Compose
• Reactive UIs with StateFlow and coroutines
• Offline-first with Room database

Kotlin Android Patterns

// MVVM with Jetpack Compose
class MainViewModel : ViewModel() {
    private val _users = MutableStateFlow<List<User>>(emptyList())
    val users: StateFlow<List<User>> = _users.asStateFlow()
    
    init { viewModelScope.launch { loadUsers() } }
    
    fun loadUsers() {
        viewModelScope.launch {
            _users.value = repository.getUsers()
        }
    }
}

@Composable
fun UserListScreen(viewModel: MainViewModel) {
    val users by viewModel.users.collectAsState()
    
    LazyColumn {
        items(users) { user ->
            UserCard(user = user)
        }
    }
}

// Room database
@Entity
data class User(
    @PrimaryKey val id: String,
    val name: String,
    val email: String
)

@Dao
interface UserDao {
    @Query("SELECT * FROM user")
    suspend fun getAll(): List<User>
}

Verification Checklist

• Architecture chosen (MVVM, MVI, or Clean Architecture)
• UI built with Jetpack Compose
• Navigation Component for screen routing
• Room database for local persistence
• Coroutines + Flow for async operations
• Dependency injection (Hilt or Koin)
• Retrofit/Ktor for networking
• Testing (JUnit, Compose UI tests, MockK)
• Google Play deployment checklist ready