Informazioni sulla protezione della barra di sistema
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Una volta che la tua app ha come target l'SDK 35 o versioni successive, la modalità edge-to-edge viene applicata. La
barra di stato del sistema e le barre di navigazione tramite gesti sono trasparenti, ma la
barra di navigazione con tre pulsanti è traslucida. Chiama enableEdgeToEdge per renderlo
compatibile con le versioni precedenti.
Crea una barra di navigazione con i gesti trasparente scegliendo come target Android 15 o versioni successive oppure
chiamando enableEdgeToEdge() con argomenti predefiniti per le versioni precedenti. Per la
barra di navigazione a tre pulsanti, imposta Window.setNavigationBarContrastEnforced
su false, altrimenti verrà applicato un velo traslucido.
Creare barre di sistema traslucide
Per creare una barra di stato traslucida, crea un composable personalizzato che si sovrappone ai
contenuti principali e disegna un gradiente nell'area coperta dagli inset.
classSystemBarProtectionSnippets:ComponentActivity(){overridefunonCreate(savedInstanceState:Bundle?){super.onCreate(savedInstanceState)// enableEdgeToEdge sets window.isNavigationBarContrastEnforced = true// which is used to add a translucent scrim to three-button navigationenableEdgeToEdge()setContent{MyTheme{// Main contentMyContent()// After drawing main content, draw status bar protectionStatusBarProtection()}}}}@ComposableprivatefunStatusBarProtection(color:Color=MaterialTheme.colorScheme.surfaceContainer,heightProvider:()->Float=calculateGradientHeight(),){Canvas(Modifier.fillMaxSize()){valcalculatedHeight=heightProvider()valgradient=Brush.verticalGradient(colors=listOf(color.copy(alpha=1f),color.copy(alpha=.8f),Color.Transparent),startY=0f,endY=calculatedHeight)drawRect(brush=gradient,size=Size(size.width,calculatedHeight),)}}@ComposablefuncalculateGradientHeight():()->Float{valstatusBars=WindowInsets.statusBarsvaldensity=LocalDensity.currentreturn{statusBars.getTop(density).times(1.2f)}}
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Ultimo aggiornamento 2025-08-27 UTC.
[[["Facile da capire","easyToUnderstand","thumb-up"],["Il problema è stato risolto","solvedMyProblem","thumb-up"],["Altra","otherUp","thumb-up"]],[["Mancano le informazioni di cui ho bisogno","missingTheInformationINeed","thumb-down"],["Troppo complicato/troppi passaggi","tooComplicatedTooManySteps","thumb-down"],["Obsoleti","outOfDate","thumb-down"],["Problema di traduzione","translationIssue","thumb-down"],["Problema relativo a esempi/codice","samplesCodeIssue","thumb-down"],["Altra","otherDown","thumb-down"]],["Ultimo aggiornamento 2025-08-27 UTC."],[],[],null,["# About system bar protection\n\nOnce your app targets SDK 35 or later, [edge-to-edge is enforced](/about/versions/15/behavior-changes-15#edge-to-edge). The\nsystem status bar and gesture navigation bars are transparent, but the\nthree-button navigation bar is translucent. Call `enableEdgeToEdge` to make this\nbackwards compatible.\n\nHowever, the system defaults might not work for all use cases. Consult the\n[Android system bars design guidance](/design/ui/mobile/guides/foundations/system-bars) and [edge-to-edge design\nguidance](/design/ui/mobile/guides/layout-and-content/edge-to-edge) for an overview of when to consider having transparent or\ntranslucent system bars.\n\nCreate transparent system bars\n------------------------------\n\nCreate a transparent gesture navigation bar by targeting Android 15 or later or\nby calling `enableEdgeToEdge()` with default arguments for earlier versions. For\nthree-button navigation bar, set [`Window.setNavigationBarContrastEnforced`](/reference/android/view/Window#setNavigationBarContrastEnforced(boolean))\nto `false` otherwise there will be a translucent scrim applied.\n\nCreate translucent system bars\n------------------------------\n\nTo create a translucent status bar, create a custom composable that overlaps the\nmain content and draws a gradient in the area covered by insets.\n\n\n```kotlin\nclass SystemBarProtectionSnippets : ComponentActivity() {\n\n override fun onCreate(savedInstanceState: Bundle?) {\n super.onCreate(savedInstanceState)\n\n // enableEdgeToEdge sets window.isNavigationBarContrastEnforced = true\n // which is used to add a translucent scrim to three-button navigation\n enableEdgeToEdge()\n\n setContent {\n MyTheme {\n // Main content\n MyContent()\n\n // After drawing main content, draw status bar protection\n StatusBarProtection()\n }\n }\n }\n}\n\n@Composable\nprivate fun StatusBarProtection(\n color: Color = MaterialTheme.colorScheme.surfaceContainer,\n heightProvider: () -\u003e Float = calculateGradientHeight(),\n) {\n\n Canvas(Modifier.fillMaxSize()) {\n val calculatedHeight = heightProvider()\n val gradient = Brush.verticalGradient(\n colors = listOf(\n color.copy(alpha = 1f),\n color.copy(alpha = .8f),\n Color.Transparent\n ),\n startY = 0f,\n endY = calculatedHeight\n )\n drawRect(\n brush = gradient,\n size = Size(size.width, calculatedHeight),\n )\n }\n}\n\n@Composable\nfun calculateGradientHeight(): () -\u003e Float {\n val statusBars = WindowInsets.statusBars\n val density = LocalDensity.current\n return { statusBars.getTop(density).times(1.2f) }\n}https://github.com/android/snippets/blob/dd30aee903e8c247786c064faab1a9ca8d10b46e/compose/snippets/src/main/java/com/example/compose/snippets/layouts/SystemBarProtectionSnippets.kt#L53-L103\n```\n\n\u003cbr /\u003e\n\n**Figure 1.** A translucent status bar.\n\nFor adaptive apps, insert a custom composable that matches the colors of each\npane, as seen in the [Edge-to--edge design](/design/ui/mobile/guides/layout-and-content/edge-to-edge). To create a translucent\nnavigation bar, set [`Window.setNavigationBarContrastEnforced`](/reference/android/view/Window#setNavigationBarContrastEnforced(boolean)) to true."]]