如何在不重叠导航项的情况下将 FAB 与 BottomAppBar 结合起来?
How to combine FAB with BottomAppBar without overlapping nav items?
我在 Jetpack Compose 的应用程序中使用 Material 的 BottomAppBar
作为我的 BottomNav。但是当我试图将我的 fab 停靠在 BottomAppBar
上时,它会覆盖导航项目,如屏幕截图所示。有什么方法可以在 fab 旁边自动添加 space 吗?
我想在不手动添加导航项之间 Space
的情况下实现此效果,如下图所示:
下面是我的代码:
@Composable
fun TestApp() {
val navController = rememberNavController()
Scaffold(
bottomBar = {
MyBottomAppBar(navController = navController)
},
floatingActionButton = {
FloatingActionButton(onClick = { }) {
Icon(imageVector = Icons.Rounded.Add, contentDescription = "fab")
}
},
floatingActionButtonPosition = FabPosition.Center,
isFloatingActionButtonDocked = true,
) {
NavHost(navController, startDestination = Screen.Bill.route) {
composable(Screen.Bill.route) { BillScreen() }
composable(Screen.Chart.route) { ChartScreen() }
composable(Screen.Budget.route) { BudgetScreen() }
composable(Screen.Account.route) { AccountScreen() }
}
}
}
@Composable
fun MyBottomAppBar(navController: NavController) {
BottomAppBar(
cutoutShape = CircleShape
) {
val navBackStackEntry by navController.currentBackStackEntryAsState()
val currentRoute = navBackStackEntry?.arguments?.getString(KEY_ROUTE)
Screen.items.forEachIndexed { index, screen ->
BottomNavigationItem(
selected = (currentRoute == screen.route),
icon = { Icon(screen.iconRes, screen.route) },
label = { Text(stringResource(id = screen.labelRes)) },
onClick = {
navController.navigate(screen.route) {
popUpTo = navController.graph.startDestination
launchSingleTop = true
}
}
)
}
}
}
BottomNavigation
是 Row
,所有 BottomNavigationItem
都是 Box
,RowScope
中带有 .weight(1f)
修饰符。
您可以在 Row
或 BottomNavigation
的中间添加一个与 BottomNavigationItem
相同大小的“空”元素。
例如:
bottomBar = {
BottomAppBar(cutoutShape = fabShape) {
BottomNavigation {
items.forEachIndexed { index, item ->
if (index != 2){ //
BottomNavigationItem(
// your implementation
)} else {
//Empty BottomNavigationItem
BottomNavigationItem(
icon = {},
label = { },
selected = false,
onClick = { },
enabled = false
)
}
}
}
}
},
我在 Jetpack Compose 的应用程序中使用 Material 的 BottomAppBar
作为我的 BottomNav。但是当我试图将我的 fab 停靠在 BottomAppBar
上时,它会覆盖导航项目,如屏幕截图所示。有什么方法可以在 fab 旁边自动添加 space 吗?
我想在不手动添加导航项之间 Space
的情况下实现此效果,如下图所示:
下面是我的代码:
@Composable
fun TestApp() {
val navController = rememberNavController()
Scaffold(
bottomBar = {
MyBottomAppBar(navController = navController)
},
floatingActionButton = {
FloatingActionButton(onClick = { }) {
Icon(imageVector = Icons.Rounded.Add, contentDescription = "fab")
}
},
floatingActionButtonPosition = FabPosition.Center,
isFloatingActionButtonDocked = true,
) {
NavHost(navController, startDestination = Screen.Bill.route) {
composable(Screen.Bill.route) { BillScreen() }
composable(Screen.Chart.route) { ChartScreen() }
composable(Screen.Budget.route) { BudgetScreen() }
composable(Screen.Account.route) { AccountScreen() }
}
}
}
@Composable
fun MyBottomAppBar(navController: NavController) {
BottomAppBar(
cutoutShape = CircleShape
) {
val navBackStackEntry by navController.currentBackStackEntryAsState()
val currentRoute = navBackStackEntry?.arguments?.getString(KEY_ROUTE)
Screen.items.forEachIndexed { index, screen ->
BottomNavigationItem(
selected = (currentRoute == screen.route),
icon = { Icon(screen.iconRes, screen.route) },
label = { Text(stringResource(id = screen.labelRes)) },
onClick = {
navController.navigate(screen.route) {
popUpTo = navController.graph.startDestination
launchSingleTop = true
}
}
)
}
}
}
BottomNavigation
是 Row
,所有 BottomNavigationItem
都是 Box
,RowScope
中带有 .weight(1f)
修饰符。
您可以在 Row
或 BottomNavigation
的中间添加一个与 BottomNavigationItem
相同大小的“空”元素。
例如:
bottomBar = {
BottomAppBar(cutoutShape = fabShape) {
BottomNavigation {
items.forEachIndexed { index, item ->
if (index != 2){ //
BottomNavigationItem(
// your implementation
)} else {
//Empty BottomNavigationItem
BottomNavigationItem(
icon = {},
label = { },
selected = false,
onClick = { },
enabled = false
)
}
}
}
}
},