When I am used BottomNavigationBarItem, I can't showing my navigation icons.
I am trying this code:
import 'package:flutter/material.dart';
import 'package:task_manager/style/style.dart';
BottomNavigationBar AppBottomNav(currentIndex, OnItemTapped) {
return BottomNavigationBar(
items: const [
BottomNavigationBarItem(
icon: Icon(Icons.list_alt),
label: "New",
),
BottomNavigationBarItem(
icon: Icon(Icons.access_time_rounded),
label: "Progress",
),
BottomNavigationBarItem(
icon: Icon(Icons.check_circle_outlined),
label: "Completed",
),
BottomNavigationBarItem(
icon: Icon(Icons.cancel),
label: "Canceled",
),
],
selectedItemColor: colorGreen,
unselectedItemColor: colorLightGray,
currentIndex: currentIndex,
showSelectedLabels: true,
showUnselectedLabels: true,
onTap: OnItemTapped,
type: BottomNavigationBarType.shifting,
);
}
You need to set uses-material-design: true in pubspec.yaml
Like Alejandro Cumpa said, you need to add uses-material-design: true in your pubspec.yaml.
You need to add this to the bottom:
name: …
description: …
publish_to: …
version: …
environment:
…
dependencies:
…
dev_dependencies:
…
flutter:
…
uses-material-design: true
Related
I tried to Run flutter and i got this error: Another exception was thrown: Assertion failed:
file:///home/moi/snap/flutter/common/flutter/packages/flutter/lib/src/material/bottom_navigation_bar.dart:189:9
You need to provide label on your BottomNavigationBarItem.
You can just empty string like
BottomNavigationBarItem(icon: Icon(Icons.abc), label: ""),
If you like to hide labels, do like this
bottomNavigationBar: BottomNavigationBar(
showSelectedLabels: false,// this
showUnselectedLabels: false,// this
items: [
BottomNavigationBarItem(icon: Icon(Icons.abc), label: ""),
BottomNavigationBarItem(icon: Icon(Icons.abc), label: ""),
],
),
The goal:
Instead of using the hard coded height for the BottomNavigationBar, I want to size it as a fraction of the screen height.
My approach so far: I figured out that I can wrap the BottomNavigationBar in a SizedBox and control the height that way. Code at the botom.
The problem: I get overflows with the BottomNavigationBarItems on various devices.
I tried scaling the icons using the height of the SizedBox, but I need to make the items pretty small to avoid the overflow so that is not an option.
The code:
final bottomNavHeight = MediaQuery.of(context).size.heigth * 0.085;
bottomNavigationBar: SizedBox(
height: bottomNavHeight,
child: BottomNavigationBar(
onTap: _selectPage,
iconSize: bottomNavHeight * 0.45,
showSelectedLabels: false,
showUnselectedLabels: false,
currentIndex: _selectedPageIndex,
type: BottomNavigationBarType.fixed,
items: [
//home
BottomNavigationBarItem(
icon: Icon(Icons.home, color: _customColorScheme['Icon 1']),
activeIcon:
Icon(Icons.home, color: _customColorScheme['Icon 2']),
label: '',
),
//favorite
BottomNavigationBarItem(
icon:
Icon(Icons.favorite, color: _customColorScheme['Icon 1']),
activeIcon:
Icon(Icons.favorite, color: _customColorScheme['Icon 2']),
label: '',
),
//loockback
BottomNavigationBarItem(
icon: Icon(Icons.bar_chart,
color: _customColorScheme['Icon 1']),
activeIcon: Icon(Icons.bar_chart,
color: _customColorScheme['Icon 2']),
label: '',
),
//info & support
BottomNavigationBarItem(
icon: Icon(Icons.info, color: _customColorScheme['Icon 1']),
activeIcon:
Icon(Icons.info, color: _customColorScheme['Icon 2']),
label: '',
),
you can use like this like css break
final bottomNavHeight = getMyheight(context);
getMyheight(BuildContext context) {
var mheight = MediaQuery.of(context).size.height;
if (mheight < 300)
return mheight * 0.80;
else if (mheight < 400)
return mheight * 0.2;
else if (mheight < 500)
return mheight * 0.2;
else if (mheight < 600)
return mheight * 0.2;
else if (mheight < 800)
return mheight * 0.3;
else
return mheight * 0.085;
}
TIP
For Discrete jump i used windows run
NB: some packages dependent on platform so may exception so for ui testing it best discrete screen.
On Windows, desktop support is enabled on Flutter 2.10 or higher. On
macOS and Linux, desktop support is disabled by default in the stable
channel. You can manually enable it with one of these commands,
depending on which platform you are running:
flutter config --enable-macos-desktop
flutter config --enable-linux-desktop
flutter config --enable-windows-desktop
This package use to test different screen sizedevicepreview
device_preview: ^1.0.0
The bottom-overflow starts around <704. BottomNavigationBarItem's is not getting enough space.
You can remove SizedBox and just start with BottomNavigationBar, it will solve the issue.
bottomNavigationBar: BottomNavigationBar(....)
I'm using Auto_Route for routing in my application and AutoTabsScaffold makes it easier. But by default, the user is navigated to the first page in the bottom navigation bar but I want it to be navigated to third page by default. How can I do that?
Here's a snippet of the code:
AutoTabsScaffold(
routes: [
A(),
B(),
C(),
D(),
E(),
],
bottomNavigationBuilder: (_, tabsRouter) {
return BottomNavigationBar(
type: BottomNavigationBarType.fixed,
backgroundColor: Colors.black,
selectedItemColor: const Color(0XFFEAF8FF),
unselectedItemColor: Colors.grey,
currentIndex: tabsRouter.activeIndex,
onTap: tabsRouter.setActiveIndex,
items: const [
BottomNavigationBarItem(
icon: Icon(Icons.groups_outlined), label: ""),
BottomNavigationBarItem(icon: Icon(Icons.search), label: ""),
BottomNavigationBarItem(
icon: Icon(Icons.catching_pokemon), label: ""),
BottomNavigationBarItem(
icon: Icon(Icons.library_add_check_outlined), label: ""),
BottomNavigationBarItem(
icon: Icon(Icons.person_outline), label: ""),
],
);
I want the user to land on C() and not A(). How can I do that? Thanks in advance.
Had the same issue.
I use auto_route package in my project.
We can see that current index depend on tabsRouter.activeIndex property.
So, I just added to the preferred route initial: true, property.
Like this:
CustomRoute(
path: '/',
page: MainScreen,
name: 'MainScreenRoute',
guards: [AuthGuard],
transitionsBuilder: TransitionsBuilders.fadeIn,
children: [
AutoRoute(
path: 'wallet',
page: WalletScreen,
),
AutoRoute(
path: 'trades',
page: TradesScreen,
),
AutoRoute(
path: 'market',
initial: true,
page: MarketScreen,
),
I have a BottomNavigationBar() in my app however after I updated to Flutter 1.22 the title parameter is deprecated. As the new label only takes a String input I cannot pass the Text() widget to pass a custom TextStyle. How do I achieve this now with the new update?
BottomNavigationBarItem(icon: Icon(Icons.notifications), label: 'tickets'),
BottomNavigationBarItem(icon: Icon(CustomIcons.calendar), label: 'calendar'),
BottomNavigationBarItem(icon: Icon(CustomIcons.home), label: 'home'),
BottomNavigationBarItem(icon: Icon(CustomIcons.podcasts), label: 'microphone'),
BottomNavigationBarItem(icon: Icon(CustomIcons.search), label: 'search')
BottomNavigationBar(
selectedLabelStyle: TextStyle(),//your text style
unselectedLabelStyle: TextStyle(),// your text style
items: [
BottomNavigationBarItem(icon: Icon(Icons.notifications), label: 'tickets'),
BottomNavigationBarItem(icon: Icon(CustomIcons.calendar), label: 'calendar'),
BottomNavigationBarItem(icon: Icon(CustomIcons.home), label: 'home'),
BottomNavigationBarItem(icon: Icon(CustomIcons.podcasts), label:
'microphone'),
BottomNavigationBarItem(icon: Icon(CustomIcons.search), label: 'search'),
]
)
I'm working on a Flutter app and trying to make my bottom navigator bar more universal. As part of that, I've moved it to its own file and now need to simply lift state up to the parent class in order to highlight the selected icon. I call it like so from the parent:
bottomNavigationBar: buildBottomNavBar(
selectedIndex: selectedIndex,
redrawDisplay: redrawDisplay,
context: context,
),
And the bottomNaviBar is built like so:
return BottomNavigationBar(
currentIndex: selectedIndex,
onTap: (int index) {
selectedIndex = index;
redrawDisplay(selectedIndex);
onBottomMenuTap(index, appProject.picsSelectable, context);
},
elevation: 5.0,
iconSize: 30.0,
items: <BottomNavigationBarItem>[
BottomNavigationBarItem(
icon: Icon(Icons.note_add),
label: 'Add Metadata',
),
BottomNavigationBarItem(
icon: Icon(Icons.share),
label: 'Share Pics',
),
BottomNavigationBarItem(
icon: Icon(Icons.delete),
label: 'Delete Pics',
),
],
);
The 'redrawDisplay' function is simply a function in the parent class that sets state, like so:
void redrawDisplay({int selectedIndex}) {
setState(() {
this.selectedIndex = selectedIndex ?? 0;
});
}
I swear this was working a few days ago, but now I'm getting the following exception:
════════ Exception caught by gesture ═════════════════════════════════════════════
Closure call with mismatched arguments: function '_SearchScreenState.redrawDisplay'
Receiver: Closure: ({int selectedIndex}) => dynamic from Function 'redrawDisplay':.
Tried calling: _SearchScreenState.redrawDisplay(0)
Found: _SearchScreenState.redrawDisplay({int selectedIndex}) => dynamic
═══════════════════════════════════════════════════════════════════════
Obviously something has changed in my code, but I have been staring at this for hours and haven't cracked it yet. Anybody have some insight into what I've screwed up?
Thanks in advance.