SDK35迁移后Compose Dialog Bottom Sheet导航栏内边距为0问题

解决方案 #

直接从宿主Activity的WindowInsets中获取导航栏高度，手动为Bottom Sheet设置底部内边距，替代Compose内置的Insets修饰符。

完整代码示例 #

import androidx.compose.foundation.clickable
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.layout.*
import androidx.compose.material3.Dialog
import androidx.compose.material3.DialogProperties
import androidx.compose.runtime.*
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.unit.dp
import androidx.core.view.WindowInsetsCompat
import android.app.Activity
import android.content.Context
import android.content.ContextWrapper

@Composable
fun ActionSheetDialog(
    actionSheet: StateFlow<ActionSheetViewModel?>,
    displayDelay: Duration = 100.milliseconds
) {
    val activity = LocalContext.current.findActivity()
    val navigationBarHeight by remember {
        derivedStateOf {
            val windowInsets = WindowInsetsCompat.toWindowInsetsCompat(activity.window.decorView.rootWindowInsets)
            val insets = windowInsets.getInsets(WindowInsetsCompat.Type.navigationBars())
            insets.bottom.toDp()
        }
    }

    Dialog(
        onDismissRequest = { /* 处理关闭逻辑 */ },
        properties = DialogProperties(
            usePlatformDefaultWidth = false,
            decorFitsSystemWindows = false
        )
    ) {
        Box(
            Modifier
                .fillMaxSize()
                .clickable(
                    indication = null,
                    interactionSource = remember { MutableInteractionSource() }
                ) { /* 点击空白处关闭 */ }
        ) {
            Column(
                Modifier
                    .align(Alignment.BottomCenter)
                    .padding(bottom = navigationBarHeight)
                    .imePadding()
                    .fillMaxWidth()
                    .padding(horizontal = 8.dp)
                    .clickable(enabled = false) {}
            ) {
                // Bottom Sheet内容区域
            }
        }
    }
}

// 扩展函数：从Context向上查找关联的Activity
fun Context.findActivity(): Activity {
    var context = this
    while (context is ContextWrapper) {
        if (context is Activity) return context
        context = context.baseContext
    }
    throw IllegalStateException("当前Context未关联任何Activity")
}

原因分析 #

1. Dialog与Activity的Window隔离：SDK35中，Compose Dialog的Window独立于宿主Activity，默认不会同步Activity的WindowInsets数据，导致navigationBarsPadding()等内置修饰符无法获取真实导航栏高度，返回值为0。
2. decorFitsSystemWindows设置：必须将DialogProperties中的decorFitsSystemWindows设为false，否则Dialog会自动调整布局填充系统栏区域，手动设置的内边距会被覆盖或失效。

注意事项 #

• 横竖屏切换时，derivedStateOf会自动重新计算导航栏高度，无需额外适配逻辑。
• 兼容三键导航、手势导航模式及不同屏幕尺寸设备。
• 确保项目依赖androidx.core:core-ktx（版本建议与Compose版本匹配），以支持WindowInsetsCompat相关API。

内容的提问来源于stack exchange，提问作者Leonardo Sibela