Android - Jetpack Compose

Modern declarative UI toolkit for building native Android interfaces.

Key Concepts

State Management

Compose provides several ways to manage state:

• remember: Survives recomposition
• rememberSaveable: Survives configuration changes
• mutableStateOf: Creates observable state
• derivedStateOf: Computed state that updates when dependencies change

@Composable
fun Counter() {
    var count by remember { mutableStateOf(0) }

    Column {
        Text("Count: $count")
        Button(onClick = { count++ }) {
            Text("Increment")
        }
    }
}

// With saveable for configuration changes
@Composable
fun SearchField() {
    var query by rememberSaveable { mutableStateOf("") }

    TextField(
        value = query,
        onValueChange = { query = it },
        placeholder = { Text("Search...") }
    )
}

State Hoisting

Lift state up to make composables stateless and reusable:

// Stateless composable
@Composable
fun NameInput(
    name: String,
    onNameChange: (String) -> Unit,
    modifier: Modifier = Modifier
) {
    TextField(
        value = name,
        onValueChange = onNameChange,
        label = { Text("Name") },
        modifier = modifier
    )
}

// Stateful parent
@Composable
fun UserForm() {
    var name by remember { mutableStateOf("") }

    NameInput(
        name = name,
        onNameChange = { name = it }
    )
}

ViewModel Integration

class UserViewModel : ViewModel() {
    private val _uiState = MutableStateFlow(UserUiState())
    val uiState: StateFlow<UserUiState> = _uiState.asStateFlow()

    fun updateName(name: String) {
        _uiState.update { it.copy(name = name) }
    }

    fun saveUser() {
        viewModelScope.launch {
            _uiState.update { it.copy(isLoading = true) }
            try {
                userRepository.save(_uiState.value.toUser())
                _uiState.update { it.copy(isLoading = false, isSaved = true) }
            } catch (e: Exception) {
                _uiState.update { it.copy(isLoading = false, error = e.message) }
            }
        }
    }
}

@Composable
fun UserScreen(viewModel: UserViewModel = viewModel()) {
    val uiState by viewModel.uiState.collectAsStateWithLifecycle()

    UserContent(
        uiState = uiState,
        onNameChange = viewModel::updateName,
        onSave = viewModel::saveUser
    )
}

Best Practices

Composable Function Guidelines

// Use Modifier as first optional parameter
@Composable
fun CustomCard(
    title: String,
    modifier: Modifier = Modifier,
    onClick: () -> Unit = {}
) {
    Card(
        modifier = modifier.clickable(onClick = onClick)
    ) {
        Text(
            text = title,
            modifier = Modifier.padding(16.dp)
        )
    }
}

// Use slot APIs for flexible content
@Composable
fun CustomScaffold(
    topBar: @Composable () -> Unit = {},
    bottomBar: @Composable () -> Unit = {},
    content: @Composable (PaddingValues) -> Unit
) {
    Scaffold(
        topBar = topBar,
        bottomBar = bottomBar,
        content = content
    )
}

Efficient Recomposition

// Use keys for list items
@Composable
fun UserList(users: List<User>) {
    LazyColumn {
        items(
            items = users,
            key = { it.id }  // Stable key for efficient updates
        ) { user ->
            UserItem(user)
        }
    }
}

// Use derivedStateOf for expensive computations
@Composable
fun FilteredList(items: List<Item>, query: String) {
    val filteredItems by remember(items, query) {
        derivedStateOf {
            items.filter { it.name.contains(query, ignoreCase = true) }
        }
how to use android-jetpack-compose
CursorClaude CodeClineCodexWindsurfGooseGitHub CopilotVS CodeGemini CLIKiloOpencodeKimi CLIRoo ClineAiderContinueZedBolt.newLovablev0Replit AgentSweepSmol DeveloperDevinCavemanAmpAntigravity
How to use android-jetpack-compose on Cursor
AI-first code editor with Composer
1
Prerequisites
Before installing skills in Cursor, ensure your development environment meets these requirements:
›Cursor installed and configured on your development machine
›Node.js version 16.0+ with npm package manager (verify with node --version)
›Active project directory or workspace where you want to add android-jetpack-compose
2
Execute installation command
Execute the skills CLI command in your project's root directory to begin installation:
$npx skills add https://github.com/thebushidocollective/han --skill android-jetpack-composecopy
The skills CLI fetches android-jetpack-compose from GitHub repository thebushidocollective/han and configures it for Cursor.
3
Select Cursor when prompted
The CLI will show a list of available agents. Use arrow keys to navigate and space to select Cursor:
◆ Which agents do you want to install to?
│
│ ── Universal (.agents/skills) ── always included ────
│   • Amp
│   • Antigravity
│   • Cline
│   • Codex
│ ●Cursor(selected)
│   • Cursor
│   • Windsurf
4
Verify installation
Confirm successful installation by checking the skill directory location:
.cursor/skills/android-jetpack-compose
Reload or restart Cursor to activate android-jetpack-compose. Access the skill through slash commands (e.g., /android-jetpack-compose) or your agent's skill management interface.
⚠
Security & Verification Notice
We perform automated surface-level scans (Gen AI Scanner, Socket, Snyk) during installation. These checks detect common vulnerabilities but do not guarantee complete security. Always review skill source code and verify the publisher's reputation before production use.
Skills execute code in your development environment. Always verify the publisher's identity, review recent commits, and test in isolated environments before production deployment.
Additional Resources
›View source code on GitHub›Skills CLI documentation›Learn more about Cursor›What are agent skills?