建立底部功能表
透過集合功能整理內容
你可以依據偏好儲存及分類內容。
底部工具列會顯示次要內容,並固定在畫面底部。
版本相容性
這個實作方式需要將專案 minSDK 設為 API 級別 21 以上。
依附元件
實作底部功能表
如要實作底部功能表,請使用 ModalBottomSheet
可組合項:
展開及收合工作表
如要展開或收合工作表,請使用 SheetState
:
重點
結果
圖 1. 標準底部資訊列 (左) 和模式底部資訊列 (右)。
包含此指南的集合
本指南是精選的快速指南系列之一,涵蓋更廣泛的 Android 開發目標:
顯示互動式元件
瞭解可組合函式如何讓您輕鬆根據 Material Design 設計系統,建立美觀的 UI 元件。
這個頁面中的內容和程式碼範例均受《內容授權》中的授權所規範。Java 與 OpenJDK 是 Oracle 和/或其關係企業的商標或註冊商標。
上次更新時間:2025-02-06 (世界標準時間)。
[null,null,["上次更新時間:2025-02-06 (世界標準時間)。"],[],[],null,["# Create a bottom sheet\n\n\u003cbr /\u003e\n\nA bottom sheet shows secondary content, anchored to the bottom of the screen.\n\nVersion compatibility\n---------------------\n\nThis implementation requires that your project minSDK be set to API level 21 or\nhigher.\n\n### Dependencies\n\n### Kotlin\n\n\u003cbr /\u003e\n\n```kotlin\n implementation(platform(\"androidx.compose:compose-bom:2025.08.00\"))\n \n```\n\n\u003cbr /\u003e\n\n### Groovy\n\n\u003cbr /\u003e\n\n```groovy\n implementation platform('androidx.compose:compose-bom:2025.08.00')\n \n```\n\n\u003cbr /\u003e\n\nImplement a bottom sheet\n------------------------\n\nTo implement a [bottom sheet](https://m3.material.io/components/bottom-sheets/overview), use the [`ModalBottomSheet`](/reference/kotlin/androidx/compose/material3/package-summary#ModalBottomSheet(kotlin.Function0,androidx.compose.ui.Modifier,androidx.compose.material3.SheetState,androidx.compose.ui.unit.Dp,androidx.compose.ui.graphics.Shape,androidx.compose.ui.graphics.Color,androidx.compose.ui.graphics.Color,androidx.compose.ui.unit.Dp,androidx.compose.ui.graphics.Color,kotlin.Function0,kotlin.Function0,androidx.compose.material3.ModalBottomSheetProperties,kotlin.Function1))\ncomposable:\n\n\u003cbr /\u003e\n\n```kotlin\nModalBottomSheet(onDismissRequest = { /* Executed when the sheet is dismissed */ }) {\n // Sheet content\n}\n \n https://github.com/android/snippets/blob/dd30aee903e8c247786c064faab1a9ca8d10b46e/compose/snippets/src/main/java/com/example/compose/snippets/layouts/MaterialLayoutSnippets.kt#L364-L366\n \n```\n\n\u003cbr /\u003e\n\nExpand and collapse the sheet\n-----------------------------\n\nTo expand and collapse the sheet, use [`SheetState`](/reference/kotlin/androidx/compose/material3/SheetState):\n\n\u003cbr /\u003e\n\n```kotlin\nval sheetState = rememberModalBottomSheetState()\nval scope = rememberCoroutineScope()\nvar showBottomSheet by remember { mutableStateOf(false) }\nScaffold(\n floatingActionButton = {\n ExtendedFloatingActionButton(\n text = { Text(\"Show bottom sheet\") },\n icon = { Icon(Icons.Filled.Add, contentDescription = \"\") },\n onClick = {\n showBottomSheet = true\n }\n )\n }\n) { contentPadding -\u003e\n // Screen content\n\n if (showBottomSheet) {\n ModalBottomSheet(\n onDismissRequest = {\n showBottomSheet = false\n },\n sheetState = sheetState\n ) {\n // Sheet content\n Button(onClick = {\n scope.launch { sheetState.hide() }.invokeOnCompletion {\n if (!sheetState.isVisible) {\n showBottomSheet = false\n }\n }\n }) {\n Text(\"Hide bottom sheet\")\n }\n }\n }\n}\n \n https://github.com/android/snippets/blob/dd30aee903e8c247786c064faab1a9ca8d10b46e/compose/snippets/src/main/java/com/example/compose/snippets/layouts/MaterialLayoutSnippets.kt#L370-L408\n \n```\n\n\u003cbr /\u003e\n\n### Key points\n\n- Use the `content` slot, which uses a [`ColumnScope`](/reference/kotlin/androidx/compose/foundation/layout/ColumnScope) to lay out sheet content composables in a column.\n- Use [`rememberSheetState`](/reference/kotlin/androidx/compose/material3/package-summary#rememberSheetState(kotlin.Boolean,kotlin.Function1)) to create an instance of `SheetState` that you pass to `ModalBottomSheet` with the `sheetState` parameter.\n- `SheetState` provides access to the [`show`](/reference/kotlin/androidx/compose/material3/SheetState#show()) and [`hide`](/reference/kotlin/androidx/compose/material3/SheetState#hide()) functions\n and to properties related to the current sheet state. These functions\n require a `CoroutineScope` --- for example, [`rememberCoroutineScope`](/reference/kotlin/androidx/compose/runtime/package-summary#remembercoroutinescope) ---\n and can be called in response to UI events.\n\n- Make sure to remove the `ModalBottomSheet` from composition when you hide\n the bottom sheet.\n\nResults\n-------\n\n\n**Figure 1.** A standard bottom sheet (left) and a modal bottom sheet (right).\n\n\u003cbr /\u003e\n\nCollections that contain this guide\n-----------------------------------\n\nThis guide is part of these curated Quick Guide collections that cover\nbroader Android development goals: \n\n### Display interactive components\n\nLearn how composable functions can enable you to easily create beautiful UI components based on the Material Design design system. \n[Quick guide collection](/develop/ui/compose/quick-guides/collections/display-interactive-components) \n\nHave questions or feedback\n--------------------------\n\nGo to our frequently asked questions page and learn about quick guides or reach out and let us know your thoughts. \n[Go to FAQ](/quick-guides/faq) [Leave feedback](https://issuetracker.google.com/issues/new?component=1573691&template=1993320)"]]