Jetpack Compose - composables, state, effects, theming
Builds modern Android UIs using Jetpack Compose. Triggers when creating UI components, managing state with remember/derivedStateOf, handling side effects with LaunchedEffect, applying Modifiers, or implementing Material 3 theming.
/plugin marketplace add pluginagentmarketplace/custom-plugin-kotlin/plugin install kotlin-assistant@pluginagentmarketplace-kotlinThis skill inherits all available tools. When active, it can use any tool Claude has access to.
assets/config.yamlassets/schema.jsonreferences/GUIDE.mdreferences/PATTERNS.mdscripts/validate.pyBuild modern UIs with Jetpack Compose declarative patterns.
@Composable
fun Counter() {
var count by remember { mutableIntStateOf(0) }
Button(onClick = { count++ }) { Text("Count: $count") }
}
// Derived state
val isValid by remember { derivedStateOf { email.isNotBlank() && password.length >= 8 } }
@Composable
fun UserScreen(userId: String) {
LaunchedEffect(userId) {
viewModel.loadUser(userId)
}
DisposableEffect(Unit) {
val listener = viewModel.addListener()
onDispose { listener.remove() }
}
}
Box(
modifier = Modifier
.fillMaxSize()
.padding(16.dp)
.background(MaterialTheme.colorScheme.surface)
.clickable { onClick() }
)
@Composable
fun AppTheme(content: @Composable () -> Unit) {
val colorScheme = if (isSystemInDarkTheme()) darkColorScheme() else lightColorScheme()
MaterialTheme(colorScheme = colorScheme, typography = Typography, content = content)
}
| Issue | Resolution |
|---|---|
| Infinite recomposition | Use remember or derivedStateOf |
| State lost on rotation | Use rememberSaveable or ViewModel |
Skill("kotlin-compose")
This skill should be used when the user asks to "create an agent", "add an agent", "write a subagent", "agent frontmatter", "when to use description", "agent examples", "agent tools", "agent colors", "autonomous agent", or needs guidance on agent structure, system prompts, triggering conditions, or agent development best practices for Claude Code plugins.
This skill should be used when the user asks to "create a slash command", "add a command", "write a custom command", "define command arguments", "use command frontmatter", "organize commands", "create command with file references", "interactive command", "use AskUserQuestion in command", or needs guidance on slash command structure, YAML frontmatter fields, dynamic arguments, bash execution in commands, user interaction patterns, or command development best practices for Claude Code.
This skill should be used when the user asks to "create a hook", "add a PreToolUse/PostToolUse/Stop hook", "validate tool use", "implement prompt-based hooks", "use ${CLAUDE_PLUGIN_ROOT}", "set up event-driven automation", "block dangerous commands", or mentions hook events (PreToolUse, PostToolUse, Stop, SubagentStop, SessionStart, SessionEnd, UserPromptSubmit, PreCompact, Notification). Provides comprehensive guidance for creating and implementing Claude Code plugin hooks with focus on advanced prompt-based hooks API.