Error Handling UI in Compose — Error, Loading & Empty State Patterns

Master error handling in Compose with sealed classes, loading states, and retry mechanisms. Sealed UiState Pattern sealed class UiState < out T > { data class Loading ( val isRefreshing : Boolean = false ) : UiState < Nothing >() data class Success < T >( val data : T ) : UiState < T >() data class Error ( val exception : Throwable , val retryAction : (() -> Unit )? = null ) : UiState < Nothing >() data class Empty ( val message : String = "No data available" ) : UiState < Nothing >() } StatefulContent Composable for State Switching @Composable fun < T > StatefulContent ( uiState : UiState < T >, onRetry : () -> Unit = {}, successContent : @Composable ( T ) -> Unit , modifier : Modifier = Modifier ) { when ( uiState ) { is UiState . Loading -> { LoadingScreen ( isRefreshing = uiState . isRefreshing , modifier = modifier ) } is UiState . Success -> { successContent ( uiState . data ) } is UiState . Error -> { ErrorScreen ( exception = uiState . exception , onRetry = { uiState . retryAct