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android-viewmodel

Best practices for implementing Android ViewModels using Kotlin 2.3+ Explicit Backing Fields, StateFlow for UI state, and SharedFlow for one-off events.

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Best practices for implementing Android ViewModels using Kotlin 2.3+ Explicit Backing Fields, StateFlow for UI state, and SharedFlow for one-off events.

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Android ViewModel & State Management

Instructions

Use ViewModel to own UI state and business logic. It should survive configuration changes and expose immutable APIs.

Kotlin 2.3+

Prefer Explicit Backing Fields instead of the traditional _state/state backing property pattern.

Kotlin 2.3: Experimental (-Xexplicit-backing-fields)

Kotlin 2.4+: Stable (recommended)

Avoid creating duplicate backing properties unless targeting older Kotlin versions.

1. UI State (StateFlow)

Purpose

Represents the persistent UI state.

Examples:

Loading
Success(data)
Error(message)
Empty

Declaration

Use an explicit backing field.

val uiState: StateFlow<UiState>
    field = MutableStateFlow(UiState.Loading)

The backing field is mutable (MutableStateFlow) while consumers only see StateFlow.

Updating State

Prefer update { } for atomic updates.

_uiState.update { old ->
    old.copy(isLoading = false)
}

With explicit backing fields:

uiState.update {
    it.copy(isLoading = false)
}

You may also assign directly when appropriate.

uiState.value = UiState.Success(data)

2. One-Off Events (SharedFlow)

Purpose

Use for transient events that should not survive recomposition or configuration changes.

Examples:

Navigate
Show Snackbar
Show Toast
Open Dialog
Request Permissions

Declaration

val uiEvent: SharedFlow<UiEvent>
    field = MutableSharedFlow(
        replay = 0,
        extraBufferCapacity = 1
    )

replay = 0 ensures events are not replayed after recreation.

Using extraBufferCapacity = 1 is recommended for UI events sent with tryEmit().

Sending Events

Suspend:

uiEvent.emit(UiEvent.NavigateBack)

Non-suspending:

uiEvent.tryEmit(UiEvent.ShowSnackbar("Saved"))

3. Collecting in Compose

StateFlow

Always collect lifecycle-aware.

val state by viewModel.uiState.collectAsStateWithLifecycle()

SharedFlow

Collect inside a single LaunchedEffect.

LaunchedEffect(Unit) {
    viewModel.uiEvent.collect { event ->
        when (event) {
            is UiEvent.NavigateBack -> { /* ... */ }
            is UiEvent.ShowSnackbar -> { /* ... */ }
        }
    }
}

Do not collect SharedFlow with collectAsState().

4. Collecting in XML/View System

Use lifecycle-aware collection.

lifecycleScope.launch {
    repeatOnLifecycle(Lifecycle.State.STARTED) {
        viewModel.uiState.collect {
            render(it)
        }
    }
}

Likewise for events.

lifecycleScope.launch {
    repeatOnLifecycle(Lifecycle.State.STARTED) {
        viewModel.uiEvent.collect(::handleEvent)
    }
}

5. Coroutine Scope

Launch all ViewModel work in viewModelScope.

viewModelScope.launch {
    repository.refresh()
}

Business logic should preferably be delegated to UseCases or Repositories.

6. State Design

Represent the entire screen with a single immutable state object.

data class UiState(
    val isLoading: Boolean = false,
    val items: List<Item> = emptyList(),
    val error: String? = null
)

Avoid exposing multiple unrelated StateFlows for one screen unless they truly have different lifecycles.

7. Best Practices

Expose immutable APIs (StateFlow, SharedFlow)

Prefer Explicit Backing Fields (Kotlin 2.4+)

Use immutable UI state

Use update {} when modifying state

Keep one-off events in SharedFlow

Keep business logic out of Composables

Use collectAsStateWithLifecycle()

Use repeatOnLifecycle() in Views

Launch work in viewModelScope

Do not expose MutableStateFlow

Do not use StateFlow for navigation events

Do not use SharedFlow for persistent screen state

Do not keep duplicate _state properties when Explicit Backing Fields are available

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文件元数据

name: android-viewmodel
description: Best practices for implementing Android ViewModels using Kotlin 2.3+ Explicit Backing Fields, StateFlow for UI state, and SharedFlow for one-off events.

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---
name: android-viewmodel
description: Best practices for implementing Android ViewModels using Kotlin 2.3+ Explicit Backing Fields, StateFlow for UI state, and SharedFlow for one-off events.
---

# Android ViewModel & State Management

## Instructions

Use `ViewModel` to own UI state and business logic. It should survive configuration changes and expose immutable APIs.

> **Kotlin 2.3+**
>
> Prefer **Explicit Backing Fields** instead of the traditional `_state`/`state` backing property pattern.
>
> - Kotlin 2.3: Experimental (`-Xexplicit-backing-fields`)
> - Kotlin 2.4+: Stable (recommended)
>
> Avoid creating duplicate backing properties unless targeting older Kotlin versions.

---

## 1. UI State (StateFlow)

### Purpose

Represents the persistent UI state.

Examples:

- Loading
- Success(data)
- Error(message)
- Empty

### Declaration

Use an explicit backing field.

```kotlin
val uiState: StateFlow<UiState>
    field = MutableStateFlow(UiState.Loading)
```

The backing field is mutable (`MutableStateFlow`) while consumers only see `StateFlow`.

### Updating State

Prefer `update { }` for atomic updates.

```kotlin
_uiState.update { old ->
    old.copy(isLoading = false)
}
```

With explicit backing fields:

```kotlin
uiState.update {
    it.copy(isLoading = false)
}
```

You may also assign directly when appropriate.

```kotlin
uiState.value = UiState.Success(data)
```

---

## 2. One-Off Events (SharedFlow)

### Purpose

Use for transient events that should not survive recomposition or configuration changes.

Examples:

- Navigate
- Show Snackbar
- Show Toast
- Open Dialog
- Request Permissions

### Declaration

```kotlin
val uiEvent: SharedFlow<UiEvent>
    field = MutableSharedFlow(
        replay = 0,
        extraBufferCapacity = 1
    )
```

`replay = 0` ensures events are **not replayed** after recreation.

Using `extraBufferCapacity = 1` is recommended for UI events sent with `tryEmit()`.

### Sending Events

Suspend:

```kotlin
uiEvent.emit(UiEvent.NavigateBack)
```

Non-suspending:

```kotlin
uiEvent.tryEmit(UiEvent.ShowSnackbar("Saved"))
```

---

## 3. Collecting in Compose

### StateFlow

Always collect lifecycle-aware.

```kotlin
val state by viewModel.uiState.collectAsStateWithLifecycle()
```

### SharedFlow

Collect inside a single `LaunchedEffect`.

```kotlin
LaunchedEffect(Unit) {
    viewModel.uiEvent.collect { event ->
        when (event) {
            is UiEvent.NavigateBack -> { /* ... */ }
            is UiEvent.ShowSnackbar -> { /* ... */ }
        }
    }
}
```

Do **not** collect `SharedFlow` with `collectAsState()`.

---

## 4. Collecting in XML/View System

Use lifecycle-aware collection.

```kotlin
lifecycleScope.launch {
    repeatOnLifecycle(Lifecycle.State.STARTED) {
        viewModel.uiState.collect {
            render(it)
        }
    }
}
```

Likewise for events.

```kotlin
lifecycleScope.launch {
    repeatOnLifecycle(Lifecycle.State.STARTED) {
        viewModel.uiEvent.collect(::handleEvent)
    }
}
```

---

## 5. Coroutine Scope

Launch all ViewModel work in `viewModelScope`.

```kotlin
viewModelScope.launch {
    repository.refresh()
}
```

Business logic should preferably be delegated to UseCases or Repositories.

---

## 6. State Design

Represent the entire screen with a single immutable state object.

```kotlin
data class UiState(
    val isLoading: Boolean = false,
    val items: List<Item> = emptyList(),
    val error: String? = null
)
```

Avoid exposing multiple unrelated `StateFlow`s for one screen unless they truly have different lifecycles.

---

## 7. Best Practices

Expose immutable APIs (`StateFlow`, `SharedFlow`)

Prefer Explicit Backing Fields (Kotlin 2.4+)

Use immutable UI state

Use `update {}` when modifying state

Keep one-off events in `SharedFlow`

Keep business logic out of Composables

Use `collectAsStateWithLifecycle()`

Use `repeatOnLifecycle()` in Views

Launch work in `viewModelScope`

Do not expose `MutableStateFlow`

Do not use `StateFlow` for navigation events

Do not use `SharedFlow` for persistent screen state

Do not keep duplicate `_state` properties when Explicit Backing Fields are available

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来源仓库: new-silvermoon/awesome-android-agent-skills
许可证: Apache-2.0
版本: 1.0.0
最近 GitHub 推送: 2026年7月27日
目录更新于: 2026年9月2日
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      "setup_required": false,
      "task_success": true,
      "output_quality": 4,
      "error_type": null,
      "human_review_required": false,
      "workspace": "sandbox",
      "time_to_useful_ms": 120000,
      "notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
    }
  },
  "endpoints": {
    "web": "https://www.openagentskill.com/skills/new-silvermoon-android-viewmodel",
    "api": "https://www.openagentskill.com/api/agent/skills/new-silvermoon-android-viewmodel",
    "audit": "https://www.openagentskill.com/skills/new-silvermoon-android-viewmodel/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=new-silvermoon-android-viewmodel&task=Use%20android-viewmodel%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20android-viewmodel%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20android-viewmodel%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/new-silvermoon-android-viewmodel/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/new-silvermoon-android-viewmodel"
  }
}

创作者工具

收录来源

Registry 收录

可认领

此列表来自公开来源，维护者认领获批前不会标记为官方。

创作者: new-silvermoon
来源: new-silvermoon/awesome-android-agent-skills
收录方: OpenAgentSkill 社区索引

归属链接指向公开仓库或创作者主页。创作者可认领列表以更新所有权信号。

认领此 Skill

所有者认领

认领此 Skill 页面

这条 Registry 收录列表归属于 new-silvermoon，但尚未标记为官方。认领后可增加已验证所有者信号，使后续发布、安装和审计更新更值得信赖。

分享工具包

创作者外链工具包

将证据徽章加入你的 README

在开发者评估仓库的位置展示规范页面、当前信任与审计信号，以及真实的 Agent 验证证据。

[![Listed on OpenAgentSkill](https://www.openagentskill.com/api/badge/new-silvermoon-android-viewmodel?metric=listed&label=Listed)](https://www.openagentskill.com/skills/new-silvermoon-android-viewmodel?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)
[![OpenAgentSkill Trust](https://www.openagentskill.com/api/badge/new-silvermoon-android-viewmodel?metric=trust&label=Trust)](https://www.openagentskill.com/skills/new-silvermoon-android-viewmodel?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)
[![OpenAgentSkill Audit](https://www.openagentskill.com/api/badge/new-silvermoon-android-viewmodel?metric=audit&label=Audit)](https://www.openagentskill.com/skills/new-silvermoon-android-viewmodel/audit)
[![Agent Proven](https://www.openagentskill.com/api/badge/new-silvermoon-android-viewmodel?metric=proven&label=Agent%20Proven)](https://www.openagentskill.com/skills/new-silvermoon-android-viewmodel?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)

预览徽章打开审计创作者工具包

社区信号

告诉我们这个 Skill 是否对你的 Agent 工作流有帮助。汇总反馈会持续改善排序。

概览

Android ViewModel & State Management

Instructions

1. UI State (StateFlow)

Purpose

Declaration

Updating State

2. One-Off Events (SharedFlow)

Purpose

Declaration

Sending Events

3. Collecting in Compose

StateFlow

SharedFlow

4. Collecting in XML/View System

5. Coroutine Scope

6. State Design

7. Best Practices

给我的 Agent 使用

获取价格与运行成本

从一个小任务开始

来源与使用须知

Agent 接入

相关 Skill

创作者工具

Registry 收录

认领此 Skill 页面

将证据徽章加入你的 README

社区信号