viewmodel

Name: viewmodel
Author: hanamizuki

104stars8forks

How to install viewmodel?

hanamizuki/solopreneur/viewmodel

$npx -y skills add hanamizuki/solopreneur --skill viewmodel

Installs into the current project.

Summary

Best practices for implementing Android ViewModels, specifically focused on StateFlow for UI state and SharedFlow for one-off events.

Files · 1

View on GitHub

SKILL.md

1	# Android ViewModel & State Management
2
3	## Instructions
4
5	Use `ViewModel` to hold state and business logic. It must outlive configuration changes.
6
7	### 1. UI State (StateFlow)
8	* What: Represents the persistent state of the UI (e.g., `Loading`, `Success(data)`, `Error`).
9	* Type: `StateFlow<UiState>`.
10	* Initialization: Must have an initial value.
11	* Exposure: Expose as a read-only `StateFlow` backing a private `MutableStateFlow`.
12	```kotlin
13	private val _uiState = MutableStateFlow<UiState>(UiState.Loading)
14	val uiState: StateFlow<UiState> = _uiState.asStateFlow()
15	```
16	* Updates: Update state using `.update { oldState -> ... }` for thread safety.
17
18	### 2. One-Off Events (SharedFlow)
19	* What: Transient events like "Show Toast", "Navigate to Screen", "Show Snackbar".
20	* Type: `SharedFlow<UiEvent>`.
21	* Configuration: Must use `replay = 0` to prevent events from re-triggering on screen rotation.
22	```kotlin
23	private val _uiEvent = MutableSharedFlow<UiEvent>(replay = 0)
24	val uiEvent: SharedFlow<UiEvent> = _uiEvent.asSharedFlow()
25	```
26	* Sending: Use `.emit(event)` (suspend) or `.tryEmit(event)`.
27
28	### 3. Collecting in UI
29	* Compose: Use `collectAsStateWithLifecycle()` for `StateFlow`.
30	```kotlin
31	val state by viewModel.uiState.collectAsStateWithLifecycle()
32	```
33	For `SharedFlow`, use `LaunchedEffect` with `LocalLifecycleOwner`.
34	* Views (XML): Use `repeatOnLifecycle(Lifecycle.State.STARTED)` within a coroutine.
35
36	### 4. Scope
37	* Use `viewModelScope` for all coroutines started by the ViewModel.
38	* Ideally, specific operations should be delegated to UseCases or Repositories.

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viewmodel

104stars8forks

View on GitHub

How to install viewmodel?

hanamizuki/solopreneur/viewmodel

$npx -y skills add hanamizuki/solopreneur --skill viewmodel

Installs into the current project.

Summary

Best practices for implementing Android ViewModels, specifically focused on StateFlow for UI state and SharedFlow for one-off events.

Files · 1

View on GitHub

SKILL.md

1	# Android ViewModel & State Management
2
3	## Instructions
4
5	Use `ViewModel` to hold state and business logic. It must outlive configuration changes.
6
7	### 1. UI State (StateFlow)
8	* What: Represents the persistent state of the UI (e.g., `Loading`, `Success(data)`, `Error`).
9	* Type: `StateFlow<UiState>`.
10	* Initialization: Must have an initial value.
11	* Exposure: Expose as a read-only `StateFlow` backing a private `MutableStateFlow`.
12	```kotlin
13	private val _uiState = MutableStateFlow<UiState>(UiState.Loading)
14	val uiState: StateFlow<UiState> = _uiState.asStateFlow()
15	```
16	* Updates: Update state using `.update { oldState -> ... }` for thread safety.
17
18	### 2. One-Off Events (SharedFlow)
19	* What: Transient events like "Show Toast", "Navigate to Screen", "Show Snackbar".
20	* Type: `SharedFlow<UiEvent>`.
21	* Configuration: Must use `replay = 0` to prevent events from re-triggering on screen rotation.
22	```kotlin
23	private val _uiEvent = MutableSharedFlow<UiEvent>(replay = 0)
24	val uiEvent: SharedFlow<UiEvent> = _uiEvent.asSharedFlow()
25	```
26	* Sending: Use `.emit(event)` (suspend) or `.tryEmit(event)`.
27
28	### 3. Collecting in UI
29	* Compose: Use `collectAsStateWithLifecycle()` for `StateFlow`.
30	```kotlin
31	val state by viewModel.uiState.collectAsStateWithLifecycle()
32	```
33	For `SharedFlow`, use `LaunchedEffect` with `LocalLifecycleOwner`.
34	* Views (XML): Use `repeatOnLifecycle(Lifecycle.State.STARTED)` within a coroutine.
35
36	### 4. Scope
37	* Use `viewModelScope` for all coroutines started by the ViewModel.
38	* Ideally, specific operations should be delegated to UseCases or Repositories.

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