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Refactor & simplify StatusBarProtection code sample #836

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4f1f444
Refactor & simplify StatusBarProtection code sample to use inset size…
ashnohe Mar 13, 2026
f3cb8d0
Update compose/snippets/src/main/java/com/example/compose/snippets/la…
ashnohe Mar 18, 2026
97faed1
ensure gradient draws to 1.2x status bar height
ashnohe Mar 19, 2026
6a24a60
refactor
ashnohe Mar 19, 2026
9ccbd60
Merge branch 'main' into systembarprotection
ashnohe Mar 19, 2026
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48 changes: 21 additions & 27 deletions ...nippets/src/main/java/com/example/compose/snippets/layouts/SystemBarProtectionSnippets.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,8 @@ import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.activity.enableEdgeToEdge
import androidx.compose.foundation.Canvas
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.WindowInsets
Expand All @@ -29,6 +30,7 @@ import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.statusBars
import androidx.compose.foundation.layout.windowInsetsTopHeight
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material3.Card
import androidx.compose.material3.CardDefaults
Expand All @@ -37,7 +39,6 @@ import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.Brush
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.LocalDensity
Expand Down Expand Up @@ -74,32 +75,25 @@ class SystemBarProtectionSnippets : ComponentActivity() {
@Composable
private fun StatusBarProtection(
color: Color = MaterialTheme.colorScheme.surfaceContainer,
heightProvider: () -> Float = calculateGradientHeight(),
) {

Canvas(Modifier.fillMaxSize()) {
val calculatedHeight = heightProvider()
val gradient = 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),
)
}
}

@Composable
fun calculateGradientHeight(): () -> Float {
val statusBars = WindowInsets.statusBars
val density = LocalDensity.current
return { statusBars.getTop(density).times(1.2f) }
Spacer(
modifier = Modifier
.fillMaxWidth()
.height(
with(LocalDensity.current) {
(WindowInsets.statusBars.getTop(this) * 1.2f).toDp()
}
)
.background(
brush = Brush.verticalGradient(
colors = listOf(
color.copy(alpha = 1f),
color.copy(alpha = 0.8f),
Color.Transparent
)
)
)
)
}
// [END android_compose_system_bar_protection]

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