Android Viewmodel
Best practices for implementing Android ViewModels, specifically focused on StateFlow for UI state and SharedFlow for one-off events.
Install
$ agentstack add skill-new-silvermoon-awesome-android-agent-skills-android-viewmodel ✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
Verified badge
Passed review? Show it. Paste this badge into your README, it links to the public security report.
Links to your public security report.[](https://agentstack.voostack.com/security/report/skill-new-silvermoon-awesome-android-agent-skills-android-viewmodel) Reliability & compatibility
Declared compatibility
Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.
We're building live execution health for every listing: tool-call success rate, median latency, uptime, and last-checked timestamps, measured, not self-reported. It isn't live yet, so we don't show numbers we can't stand behind.
How agent discovery & health will work →About
Android ViewModel & State Management
Instructions
Use ViewModel to hold state and business logic. It must outlive configuration changes.
1. UI State (StateFlow)
- What: Represents the persistent state of the UI (e.g.,
Loading,Success(data),Error). - Type:
StateFlow. - Initialization: Must have an initial value.
- Exposure: Expose as a read-only
StateFlowbacking a privateMutableStateFlow.
``kotlin private val _uiState = MutableStateFlow(UiState.Loading) val uiState: StateFlow = _uiState.asStateFlow() ``
- Updates: Update state using
.update { oldState -> ... }for thread safety.
2. One-Off Events (SharedFlow)
- What: Transient events like "Show Toast", "Navigate to Screen", "Show Snackbar".
- Type:
SharedFlow. - Configuration: Must use
replay = 0to prevent events from re-triggering on screen rotation.
``kotlin private val _uiEvent = MutableSharedFlow(replay = 0) val uiEvent: SharedFlow = _uiEvent.asSharedFlow() ``
- Sending: Use
.emit(event)(suspend) or.tryEmit(event).
3. Collecting in UI
- Compose: Use
collectAsStateWithLifecycle()forStateFlow.
``kotlin val state by viewModel.uiState.collectAsStateWithLifecycle() ` For SharedFlow, use LaunchedEffect with LocalLifecycleOwner`.
- Views (XML): Use
repeatOnLifecycle(Lifecycle.State.STARTED)within a coroutine.
4. Scope
- Use
viewModelScopefor all coroutines started by the ViewModel. - Ideally, specific operations should be delegated to UseCases or Repositories.
Source & license
This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: new-silvermoon
- Source: new-silvermoon/awesome-android-agent-skills
- License: Apache-2.0
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.