Develop Reference

How to make dart flutter popup box?

I have an application like this:
My aim is that when I press the eye icon next to the text "Hello", I want a box to open just below the text and write the German version of "Hello". So it will say "Hallo".
My purpose is to show the meaning of the word.
When I press the eye, I want to show the German of the word. How can I make a white box under the word Hello, that is, the box in which the German language will be written?
Codes:
import 'package:flutter/material.dart';
import 'package:carousel_slider/carousel_slider.dart';
class selamlasmaLearn extends StatelessWidget {
List <wordAndMeaning> wordsList = [wordAndMeaning("Hello", "Hallo"), wordAndMeaning("Go", "Gehen")];
#override
Widget build(BuildContext context) {
return Scaffold(
body: Builder(
builder: (context) {
final double height = MediaQuery.of(context).size.height;
return CarouselSlider(
options: CarouselOptions(
height: height,
viewportFraction: 1.0,
enlargeCenterPage: false,
),
items: wordsList.map((wordAndMeaning word) {
return Builder(
builder: (BuildContext context) {
return Container(
width: MediaQuery.of(context).size.width,
decoration: BoxDecoration(color: Colors.amber),
child: Center(
child: Row(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text(
word.word,
style: TextStyle(fontSize: 45, color: Colors.white),
),
SizedBox(width: 10,),
Icon(Icons.remove_red_eye_sharp, color: Colors.white, size: 25,), // <<<<<<<<<
],
),
),
);
},
);
}).toList(),
);
}
),
);
}
}
class wordAndMeaning {
String word;
String meaning;
wordAndMeaning(this.word, this.meaning);
}
I keep the word and its German in a list called wordsList.
Thanks for the help in advance.

You can convert the widget to StatefulWidget or use a ValueNotifier to control the preserve/notify the state visibility.
You can use Visibility widget or just if to show and hide German text.
class selamlasmaLearn extends StatefulWidget {
#override
State<selamlasmaLearn> createState() => _selamlasmaLearnState();
}
class _selamlasmaLearnState extends State<selamlasmaLearn> {
bool _showGerman = false;
List<wordAndMeaning> wordsList = [
wordAndMeaning("Hello", "Hallo"),
wordAndMeaning("Go", "Gehen")
];
#override
Widget build(BuildContext context) {
return Scaffold(
body: Builder(builder: (context) {
final double height = MediaQuery.of(context).size.height;
return CarouselSlider(
options: CarouselOptions(
height: height,
viewportFraction: 1.0,
enlargeCenterPage: false,
),
items: wordsList.map((wordAndMeaning word) {
return Builder(
builder: (BuildContext context) {
return Container(
width: MediaQuery.of(context).size.width,
decoration: BoxDecoration(color: Colors.amber),
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
mainAxisSize: MainAxisSize.min,
children: [
Column(
mainAxisSize: MainAxisSize.min,
children: [
Text(word.word,
style:
TextStyle(fontSize: 45, color: Colors.white)),
if (_showGerman) Text(word.meaning), //modify the way you want
],
),
const SizedBox(
width: 10,
),
IconButton(
icon: Icon(Icons.remove_red_eye_sharp),
color: Colors.white,
iconSize: 25,
onPressed: () {
setState(() {
_showGerman = !_showGerman;
});
},
),
],
),
);
},
);
}).toList(),
);
}),
);
}
}

Use the Tooltip widget
I'm emphasizing on the popup part in your question title. When using a Tooltip you ensure that your widgets do not shift position or jump when the Tooltip widget appear, as the example below illustrates.
Example code:
import 'package:flutter/material.dart';
class TooltipExample extends StatelessWidget {
const TooltipExample({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return Center(
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
Tooltip(
// Set the tooltip to trigger on a single tap, tapping outside the
// widget will make the tooltip disappear.
triggerMode: TooltipTriggerMode.tap,
// The message shown when the tooltip appears.
message: "Tooltip showing!",
// Consider adjusting this to your needs.
showDuration: const Duration(days: 1),
// The widget that must be clicked to show the tooltip.
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Row(
mainAxisSize: MainAxisSize.min,
children: const [
Text("Hello"),
SizedBox(
width: 8,
),
Icon(Icons.visibility),
],
),
),
),
const Padding(
padding: EdgeInsets.all(8.0),
child: Text("Cover me!"),
)
],
),
);
}
}
// Some code to run the above example, note the theme part that turns the
// tooltip white.
class App extends StatelessWidget {
const App({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return MaterialApp(
// Style the overall design of tooltips in the app in one place,
// or provide in each tooltip individually.
theme: ThemeData(
tooltipTheme: const TooltipThemeData(
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.all(
Radius.circular(4),
),
),
textStyle: TextStyle(
backgroundColor: Colors.white,
color: Colors.black,
),
),
),
home: const Scaffold(
backgroundColor: Colors.amber,
body: TooltipExample(),
),
);
}
}
void main() => runApp(const App());
Here is how it looks:
Note that the Tooltip widget overlays whatever is below it. (instead of pushing it further down - like toggling the visibility of a normal widget in a row or column would have done)

How to show the fetched data from api on a button click in flutter?

I want to show the fetched love calculator data after button click but how to visible it? Please answer
import 'dart:io';
import 'package:AllInOneCalci/CustomTextField.dart';
import 'package:AllInOneCalci/Post.dart';
import 'package:AllInOneCalci/customAppBar.dart';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';
import 'dart:async';
class LoveCalUI extends StatelessWidget {
#override
Widget build(BuildContext context) {
var AppBarHeight = MediaQuery.of(context).size.height;
return Scaffold(
appBar: customAppBar(
height: (AppBarHeight / 3) * 0.4,
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Padding(
padding: const EdgeInsets.only(top: 18.0),
child: Text(
'All In One Cali',
style: TextStyle(
color: Colors.black,
fontSize: 35.0,
fontFamily: 'DancingScript',
fontWeight: FontWeight.bold),
),
),
],
),
),
body: CustomFetchData(),
);
}
}
class CustomFetchData extends StatefulWidget {
#override
_CustomFetchDataState createState() => _CustomFetchDataState();
}
class _CustomFetchDataState extends State<CustomFetchData> {
TextEditingController firstNameController = new TextEditingController();
TextEditingController secondNameController = new TextEditingController();
Future<Post> getData() async {
final response = await http.get(
'https://love-calculator.p.rapidapi.com/getPercentage?fname=aalia&sname=Alice',
headers: {
'x-rapidapi-host': 'love-calculator.p.rapidapi.com',
'x-rapidapi-key':
'84e84770b9msh59a96d8b03cb4aap1615a1jsn1cd0ef******',
});
if (response.statusCode == 200) {
return Post.fromJson(json.decode(response.body));
} else {
throw Exception('Failed to load api');
}
}
Widget ErrorDesign() {
return Padding(
padding: const EdgeInsets.all(20.0),
child: Container(
alignment: Alignment.center,
child: Text(
'Error: Kindly Connect to Internet',
style: TextStyle(
color: Colors.redAccent,
fontFamily: 'DancingScript',
fontSize: 40.0,
fontWeight: FontWeight.bold,
),
),
),
);
}
Widget DisplayData(String percentageValue, String result) {
return Padding(
padding: const EdgeInsets.all(20.0),
child: Container(
height: 100.0,
color: Colors.black,
child: Column(
children: [
Text('Percentage is $percentageValue',
style: TextStyle(
color: Colors.white,
)),
Text('Result is: $result',
style: TextStyle(
color: Colors.white,
)),
],
),
),
);
}
Widget FetchedCalculationValues() {
return Column(
children: [
Container(
child: FutureBuilder<Post>(
future: getData(),
builder: (BuildContext context, snapshot) {
if (snapshot.connectionState == ConnectionState.waiting) {
return Center(
child: Padding(
padding: const EdgeInsets.all(20.0),
child: CircularProgressIndicator(),
),
);
} else {
if (snapshot.hasError) {
return Container(
child: ErrorDesign(),
);
} else {
return DisplayData(
snapshot.data.percentage, snapshot.data.result);
}
}
})),
],
);
}
#override
Widget build(BuildContext context) {
return Column(
children: [
Padding(
padding: const EdgeInsets.only(left: 18.0, right: 18.0, top: 15.0),
child: CustomTextField('First Name', "", Colors.cyan,
Colors.cyanAccent, Colors.redAccent, firstNameController),
),
Padding(
padding: const EdgeInsets.only(left: 18.0, right: 18.0),
child: CustomTextField('Second Name', "", Colors.red,
Colors.redAccent, Colors.cyanAccent, secondNameController),
),
Padding(
padding: const EdgeInsets.all(18.0),
child: MaterialButton(
color: Colors.redAccent,
child: Text(
'Result',
style: TextStyle(
color: Colors.white,
),
),
onPressed: () {
FetchedCalculationValues();
print('Fetch Calling');
}),
),
Visibility(
visible: false,
child: FetchedCalculationValues(),
),
],
);
}
#override
// ignore: must_call_super
void initState() {
getData();
}
}
How to make the function for api call visible to the screen after button click.
Also I want to use the text field's values at the place of defalut values
Can you solve my problem? It will be very helpful if you do so. I am a newbie and learning flutter since 15 days. Help me so that I can learn it fast. Also the flutter's community is growing fast so it will be easy for me not to wait for response. Thank You.

I have created simplified, single-screen, app without any extra capabilities to solve exactly your issue. It contains two text fields, two Text widgets to display API results and a floating action button to make request.
Key concepts that you should know to make this code are http requests and asynchronous coding. Those links are good starting points for you to get a sense of what actually happens
To summarize what exactly you need:
You send request asynchronously to the API declaring function with async keyword and await keyword in front of http.get() function. This allows you to wait for the result of the request without freezing the app
When result comes back, the rest of the _getNames() function gets executed, which includes setState(). setState() rebuilds your widget and updates values in Text() widgets
Full code:
import 'package:flutter/material.dart';
import 'dart:convert';
import 'package:http/http.dart' as http;
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int percentage = 0;
String resultString = "";
Map<String, String> requestHeaders = {
'x-rapidapi-host': 'love-calculator.p.rapidapi.com',
'x-rapidapi-key': 'your API key',
};
final name1Controller = TextEditingController();
final name2Controller = TextEditingController();
void _getNames({String name1, String name2}) async {
final response = await http.get(
'https://love-calculator.p.rapidapi.com/getPercentage?fname=$name1&sname=$name2',
// Send authorization headers to the backend.
headers: requestHeaders,
);
final responseJson = json.decode(response.body);
setState(() {
percentage = int.parse(responseJson['percentage']);
resultString = responseJson['result'];
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
TextField(
controller: name1Controller,
decoration: InputDecoration(
hintText: "name 1",
),
),
TextField(
controller: name2Controller,
decoration: InputDecoration(
hintText: "name 2",
),
),
SizedBox(
height: 10,
),
Text(
'Your Score is: $percentage',
),
Text(
'$resultString',
style: Theme.of(context).textTheme.headline4,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: () {
_getNames(
name1: name1Controller.text,
name2: name2Controller.text,
);
},
tooltip: 'Increment',
child: Text('Go'),
),
);
}
}

How to pass data/Images from one page to another in Bottom Navigation Bar

I wanted to send Data/images from one page to another. In the Homepage when I tap on the add Icon button image should be passed to the Cart page and if the icon is tapped again image is removed from the Cart page. But, the cart page should be accessed from bottom navigation bar.
but it is showing an error called 1 positional argument(s) expected, but 0 found.
Try adding the missing arguments.. when it calls the cart page.
HomePage.dart file
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blueGrey,
),
home: NavBar(),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
List<Dish> _dishes = List<Dish>();
List<Dish> _cartList = List<Dish>();
#override
void initState() {
super.initState();
_populateDishes();
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
actions: <Widget>[
Padding(
padding: const EdgeInsets.only(right: 16.0, top: 8.0),
child: GestureDetector(
child: Stack(
alignment: Alignment.topCenter,
children: <Widget>[
Icon(
Icons.shopping_cart,
size: 36.0,
),
if (_cartList.length > 0)
Padding(
padding: const EdgeInsets.only(left: 2.0),
child: CircleAvatar(
radius: 8.0,
backgroundColor: Colors.red,
foregroundColor: Colors.white,
child: Text(
_cartList.length.toString(),
style: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 12.0,
),
),
),
),
],
),
onTap: () {
if (_cartList.isNotEmpty)
Navigator.of(context).push(
MaterialPageRoute(
builder: (context) => Cart(_cartList),
),
);
},
),
)
],
),
body: _buildGridView(),
);
}
ListView _buildListView() {
return ListView.builder(
itemCount: _dishes.length,
itemBuilder: (context, index) {
var item = _dishes[index];
return Padding(
padding: const EdgeInsets.symmetric(
horizontal: 8.0,
vertical: 2.0,
),
child: Card(
elevation: 4.0,
child: ListTile(
leading: Icon(
item.icon,
color: item.color,
),
title: Text(item.name),
trailing: GestureDetector(
child: (!_cartList.contains(item))
? Icon(
Icons.add_circle,
color: Colors.green,
)
: Icon(
Icons.remove_circle,
color: Colors.red,
),
onTap: () {
setState(() {
if (!_cartList.contains(item))
_cartList.add(item);
else
_cartList.remove(item);
});
},
),
),
),
);
},
);
}
GridView _buildGridView() {
return GridView.builder(
padding: const EdgeInsets.all(4.0),
gridDelegate:
SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2),
itemCount: _dishes.length,
itemBuilder: (context, index) {
var item = _dishes[index];
return Card(
elevation: 4.0,
child: Stack(
fit: StackFit.loose,
alignment: Alignment.center,
children: <Widget>[
Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Icon(
item.icon,
color: (_cartList.contains(item))
? Colors.grey
: item.color,
size: 100.0,
),
Text(
item.name,
textAlign: TextAlign.center,
style: Theme.of(context).textTheme.subhead,
)
],
),
Padding(
padding: const EdgeInsets.only(
right: 8.0,
bottom: 8.0,
),
child: Align(
alignment: Alignment.bottomRight,
child: GestureDetector(
child: (!_cartList.contains(item))
? Icon(
Icons.add_circle,
color: Colors.green,
)
: Icon(
Icons.remove_circle,
color: Colors.red,
),
onTap: () {
setState(() {
if (!_cartList.contains(item))
_cartList.add(item);
else
_cartList.remove(item);
});
},
),
),
),
],
));
});
}
void _populateDishes() {
var list = <Dish>[
Dish(
name: 'Chicken Zinger',
icon: Icons.fastfood,
color: Colors.amber,
),
Dish(
name: 'Chicken Zinger without chicken',
icon: Icons.print,
color: Colors.deepOrange,
),
Dish(
name: 'Rice',
icon: Icons.child_care,
color: Colors.brown,
),
Dish(
name: 'Beef burger without beef',
icon: Icons.whatshot,
color: Colors.green,
),
Dish(
name: 'Laptop without OS',
icon: Icons.laptop,
color: Colors.purple,
),
Dish(
name: 'Mac wihout macOS',
icon: Icons.laptop_mac,
color: Colors.blueGrey,
),
];
setState(() {
_dishes = list;
});
}
}
Cart.dart file
import 'package:flutter/material.dart';
import 'dish_object.dart';
class Cart extends StatefulWidget {
final List<Dish> _cart;
Cart(this._cart);
#override
_CartState createState() => _CartState(this._cart);
}
class _CartState extends State<Cart> {
_CartState(this._cart);
List<Dish> _cart;
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Cart'),
),
body: ListView.builder(
itemCount: _cart.length,
itemBuilder: (context, index) {
var item = _cart[index];
return Padding(
padding: const EdgeInsets.symmetric(horizontal: 8.0, vertical: 2.0),
child: Card(
elevation: 4.0,
child: ListTile(
leading: Icon(
item.icon,
color: item.color,
),
title: Text(item.name),
trailing: GestureDetector(
child: Icon(
Icons.remove_circle,
color: Colors.red,
),
onTap: () {
setState(() {
_cart.remove(item);
});
},
),
),
),
);
},
),
);
}
}
NavBar.dart file
import 'package:flutter/material.dart';
import 'package:sharewallpaper/cart.dart';
import 'package:sharewallpaper/main.dart';
class NavBar extends StatefulWidget {
#override
_NavBarState createState() => _NavBarState();
}
class _NavBarState extends State<NavBar> {
int _currentIndex = 0;
final List<Widget> _children = [
MyHomePage(),
Cart(), ** This line is throwing an error **
];
void onTappedBar(int index) {
setState(() {
_currentIndex = index;
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: _children[_currentIndex],
bottomNavigationBar: BottomNavigationBar(
onTap: onTappedBar,
currentIndex: _currentIndex,
items: [
BottomNavigationBarItem(icon: Icon(Icons.home), title: Text('Home')),
BottomNavigationBarItem(
icon: Icon(Icons.bookmark), title: Text('BookMark')),
],
),
);
}
}

Yep, it will throw an error because the constructor of the Cart class is expecting one parameter to be passed in. You could use a named constructor instead like this:
class Cart extends StatefulWidget {
final List<Dish> _cart;
Cart(this._cart);
That way, you can call it like so:
Cart(cart: _cartList),
But if you actually need the cart list, I would recommend that you write a provider to keep track of the cart data across screens.

Ads overlapping bottom navigation in flutter

i have setup banner ads in flutter and those are overlapping the bottom navigation bar
I want to display ads below that bottom navigation bar,
is there any way that i can add a margin below the bottom navigation bar ?
i have implemented ads in home.dart (mainpage)
import 'package:provider/provider.dart';
import '../../ui/widgets/bottom_nav_bar.dart';
import '../../core/utils/theme.dart';
import 'search_page.dart';
import 'category.dart';
import 'main_page.dart';
import 'settings.dart';
import 'package:flutter/material.dart';
import 'package:firebase_admob/firebase_admob.dart';
import 'for_you.dart';
const String AD_MOB_APP_ID = 'ca-app-pub-3940256099942544~3347511713';
const String AD_MOB_TEST_DEVICE = 'DEC3010B2445165B43EB949F5D97D0F8 - run ad then check device logs for value';
const String AD_MOB_AD_ID = 'ca-app-pub-3940256099942544/6300978111';
class HomePage extends StatefulWidget {
#override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
BannerAd _bannerAd;
static final MobileAdTargetingInfo targetingInfo = new MobileAdTargetingInfo(
testDevices: <String>[AD_MOB_TEST_DEVICE],
);
BannerAd createBannerAd() {
return new BannerAd(
adUnitId: AD_MOB_AD_ID,
size: AdSize.banner,
targetingInfo: targetingInfo,
);
}
final GlobalKey<ScaffoldState> _scaffoldKey = new GlobalKey<ScaffoldState>();
int _selectedIndex = 0;
final PageController _pageController = PageController();
#override
void initState() {
super.initState();
}
#override
void dispose() {
super.dispose();
_pageController.dispose();
}
#override
Widget build(BuildContext context) {
final stateData = Provider.of<ThemeNotifier>(context);
final ThemeData state = stateData.getTheme();
FirebaseAdMob.instance.initialize(appId: AD_MOB_APP_ID);
_bannerAd = createBannerAd()..load()..show();
return Scaffold(
key: _scaffoldKey,
appBar: AppBar(
centerTitle: false,
backgroundColor: state.primaryColor,
elevation: 0,
title: Text(
'RevWalls',
style: state.textTheme.headline,
),
actions: <Widget>[
IconButton(
icon: Icon(
Icons.search,
color: state.textTheme.body1.color,
),
onPressed: () => showSearch(
context: context, delegate: WallpaperSearch(themeData: state)),
)
],
),
body: Container(
color: state.primaryColor,
child: PageView(
controller: _pageController,
physics: BouncingScrollPhysics(),
onPageChanged: (index) {
setState(() {
_selectedIndex = index;
});
},
children: <Widget>[
MainBody(),
Category(),
ForYou(),
SettingsPage(),
],
),
),
bottomNavigationBar: BottomNavyBar(
selectedIndex: _selectedIndex,
unselectedColor: state.textTheme.body1.color,
onItemSelected: (index) {
_pageController.jumpToPage(index);
},
selectedColor: state.accentColor,
backgroundColor: state.primaryColor,
showElevation: false,
items: [
BottomNavyBarItem(
icon: Icon(Icons.home),
title: Text('Home'),
),
BottomNavyBarItem(
icon: Icon(Icons.category),
title: Text('Subreddits'),
),
BottomNavyBarItem(
icon: Icon(Icons.phone_android),
title: Text('Exact Fit'),
),
BottomNavyBarItem(
icon: Icon(Icons.settings),
title: Text('Settings'),
),
],
),
);
}
Widget oldBody(ThemeData state) {
return NestedScrollView(
headerSliverBuilder: (BuildContext context, bool boxIsScrolled) {
return <Widget>[
SliverAppBar(
backgroundColor: state.primaryColor,
elevation: 4,
title: Text(
'reWalls',
style: state.textTheme.headline,
),
actions: <Widget>[
IconButton(
icon: Icon(Icons.search, color: state.accentColor),
onPressed: () {
showSearch(
context: context,
delegate: WallpaperSearch(themeData: state));
},
)
],
floating: true,
pinned: _selectedIndex == 0 ? false : true,
snap: false,
centerTitle: false,
),
];
},
body: Container(
color: state.primaryColor,
child: PageView(
controller: _pageController,
onPageChanged: (index) {
setState(() {
_selectedIndex = index;
});
},
children: <Widget>[
MainBody(),
Category(),
ForYou(),
SettingsPage(),
],
),
),
);
}
}
and here is the bottom navigation bar -
library bottom_navy_bar;
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
class BottomNavyBar extends StatelessWidget {
final int selectedIndex;
final double iconSize;
final Color backgroundColor, selectedColor, unselectedColor;
final bool showElevation;
final Duration animationDuration;
final List<BottomNavyBarItem> items;
final ValueChanged<int> onItemSelected;
BottomNavyBar(
{Key key,
this.selectedIndex = 0,
this.showElevation = true,
this.iconSize = 20,
this.backgroundColor,
this.selectedColor,
this.unselectedColor,
this.animationDuration = const Duration(milliseconds: 250),
#required this.items,
#required this.onItemSelected}) {
assert(items != null);
assert(items.length >= 2 && items.length <= 5);
assert(onItemSelected != null);
}
Widget _buildItem(BottomNavyBarItem item, bool isSelected) {
return AnimatedContainer(
width: isSelected ? 120 : 50,
height: double.maxFinite,
duration: animationDuration,
decoration: BoxDecoration(
color: isSelected ? selectedColor.withOpacity(0.2) : backgroundColor,
borderRadius: BorderRadius.all(Radius.circular(100.0)),
),
alignment: Alignment.center,
child: ListView(
shrinkWrap: true,
physics: NeverScrollableScrollPhysics(),
scrollDirection: Axis.horizontal,
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Padding(
padding: const EdgeInsets.only(right: 8),
child: IconTheme(
data: IconThemeData(
size: iconSize,
color: isSelected ? selectedColor : unselectedColor),
child: item.icon,
),
),
isSelected
? DefaultTextStyle.merge(
style: TextStyle(
fontSize: 16,
color: selectedColor,
fontWeight: FontWeight.bold),
child: item.title,
)
: SizedBox.shrink()
],
)
],
),
);
}
#override
Widget build(BuildContext context) {
return Container(
color: backgroundColor,
child: Container(
width: double.infinity,
height: 55,
padding: EdgeInsets.all(8),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: items.map((item) {
var index = items.indexOf(item);
return GestureDetector(
onTap: () {
onItemSelected(index);
},
child: _buildItem(item, selectedIndex == index),
);
}).toList(),
),
),
);
}
}
class BottomNavyBarItem {
final Icon icon;
final Text title;
BottomNavyBarItem({
#required this.icon,
#required this.title,
}) {
assert(icon != null);
assert(title != null);
}
}
Please help

adding builder like this will solve the problem
var paddingBottom = 60.0;
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
//
return MaterialApp(
debugShowCheckedModeBanner: false,
title: 'World General info',
//theme: ThemeData(primarySwatch: Colors.cyan,),
theme: ThemeData(
primaryColor: Colors.cyan,
accentColor: Colors.green,
textTheme: TextTheme(bodyText2: TextStyle(color: Colors.purple)),
),
home: MyHomePage(title: 'World General Info'),
builder: (BuildContext context, Widget child) {
return new Padding(
child: child,
padding: EdgeInsets.only(bottom: paddingBottom),
);
}
);
}
}

You can use the MediaQuery.of(context) for that.
Wrap the whole Code inside a Container of height: MediaQuery.of(context).size.height - 60 . (the height of ad)
Column(
children: [
Container(
height: MediaQuery.of(context).size.height - 60,
child: HomePage(),
),
BannerAd(),
]
);

Found answer myself
We can use this to set margin in a container with other things like height, width
This code will add margin to bottom of bottom nav bar, as per my need i want to show ads below navbar so this solves my problem
margin: const EdgeInsets.only(bottom: 50)

Add this to your scaffold
bottomNavigationBar: Container(
height: 50.0,
color: Colors.white,
),

Think Simplest bro ... wrap your column ( mainAxisSize : MainAxisSize.min )
Scaffold(
appBar: _appBar,
body: _body,
bottomNavigationBar: Column(
mainAxisAlignment: MainAxisAlignment.end,
mainAxisSize: MainAxisSize.min,
children: [
Container(
color: Colors.amber,
height: 70,
child: Center(child: Text('Banner'))),
BottomNavigationBar(
items: const [
BottomNavigationBarItem(icon: Icon(Icons.add), label: 'Add'),
BottomNavigationBarItem(icon: Icon(Icons.add), label: 'Add'),
BottomNavigationBarItem(icon: Icon(Icons.add), label: 'Add')
],
)
]))

How can I customize each interface of a list view in Flutter?

I'm developing a catalog of products, with a List of Cards, each Card has a button, but when I press it, all the Cards, direct me to the same activity, how could I make each card I went to a different activity and modified it my way.
I've tried the Hero widget, but it's the same thing it repeats the same screen, just with different image and text.
PAGE OF LIST CARDS
import 'package:flutter/material.dart';
class SlidingCard extends StatelessWidget {
final String name; //<-- title of the event
final String date; //<-- date of the event
final String assetName; //<-- name of the image to be displayed
const SlidingCard({
Key key,
#required this.name,
#required this.date,
#required this.assetName,
}) : super(key: key);
#override
Widget build(BuildContext context) {
return Card(
margin: EdgeInsets.only(left: 8, right: 8, bottom: 24),
elevation: 8,
shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(32)), //<--custom shape
child: Column(
children: <Widget>[
ClipRRect( //<--clipping image
borderRadius: BorderRadius.vertical(top: Radius.circular(32)),
child: Image.asset( //<-- main image
'lib/assets/$assetName',
height: MediaQuery.of(context).size.height * 0.35,
width: 500,
fit: BoxFit.cover,
),
),
SizedBox(height: 8),
Expanded(
child: CardContent(
name: name,
date :date,
), //<-- will be replaced soon :)
),
],
),
);
}
}
class CardContent extends StatelessWidget {
final String name;
final String date;
const CardContent({Key key, #required this.name, #required this.date})
: super(key: key);
#override
Widget build(BuildContext context) {
return Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(name, style: TextStyle(fontSize: 20)),
SizedBox(height: 8),
Text(date, style: TextStyle(color: Colors.grey)),
Spacer(),
//SizedBox(width: 30),
Row(
children: <Widget>[
RaisedButton(
color: Color(0xFF162A49),
child: Text('VER PRODUCTOS'),
textColor: Colors.white,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(32),
),
onPressed: () {print("Hello");}, //<-- I want this button to allow each card to navigate to a different activity
),
SizedBox(width: 4),
Icon( Icons.visibility),
SizedBox(width: 16),
],
)
],
),
);
}
}
PAGE CARDS
import 'package:flutter/material.dart';
import 'package:pt_nisira_app/controller/cards_ex.dart';
class pagePay extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Color.fromRGBO(58, 66, 86, 1.0),
body: Center(
child : Padding(
padding: const EdgeInsets.only(top:15.0),
child: SlidingCardsView(),
),
),
);
}
}
class SlidingCardsView extends StatefulWidget {
#override
_SlidingCardsViewState createState() => _SlidingCardsViewState();
}
class _SlidingCardsViewState extends State<SlidingCardsView> {
PageController pageController;
#override
void initState() {
super.initState();
pageController = PageController(viewportFraction: 0.8);
}
#override
void dispose() {
pageController.dispose();
super.dispose();
}
#override
Widget build(BuildContext context) {
return SizedBox(
width: 350,
height: MediaQuery.of(context).size.height * 0.65, //<-- set height of the card
child: PageView(
controller: pageController,
children: <Widget>[
SlidingCard(
name: 'CATALAGO DE GASEOSAS',
date: '4.20-30',
assetName: 'bebidas_gaseosas.jpg',
),
SlidingCard(
name: 'CATALAGO DE GOLOSINAS',
date: '4.28-31',
assetName: 'golosinas_productos.jpg',
),
SlidingCard(
name: 'CATALAGO DE LACTEOS',
date: '4.28-31',
assetName: 'lacteos_productos.jpg',
),
SlidingCard(
name: 'CATALAGO DE PRODUCTOS DE COCINA',
date: '4.28-31',
assetName: 'cocina_productos.jpg',
),
],
),
);
}
}
I would like each page to be customized

First, you should create a list of routes as :
final routes = ['/FirstPage', '/SecondPage'];
Then, on onTap() of the list item :
Navigator.pushNamed(context, routes[index]);

you can pass activity prop to your SlidingCard.
SlidingCard(
name: 'CATALAGO DE GOLOSINAS',
date: '4.28-31',
assetName: 'golosinas_productos.jpg',
activity: () {
print('do some acitivity');
}
),
SlidingCard(
name: 'CATALAGO DE GOLOSINAS',
date: '4.28-31',
assetName: 'golosinas_productos.jpg',
activity: () {
print('do some another acitivity');
}
),
and in your CardContent widget :
RaisedButton(
color: Color(0xFF162A49),
child: Text('VER PRODUCTOS'),
textColor: Colors.white,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(32),
),
onPressed: () {
activity(); // pass your acitivity prop from top level widget to CardContent widget and call it on the RaisedButton;
},
),