Flutter 如何在Flatter中使用show case视图？
我在我的应用程序中使用软件包，并想展示一次（就在第一次启动之后）， 我怎么能只做一次，而不在下次发布时显示Flutter 如何在Flatter中使用show case视图？,flutter,dart,showcaseview,Flutter,Dart,Showcaseview,我在我的应用程序中使用软件包，并想展示一次（就在第一次启动之后）， 我怎么能只做一次，而不在下次发布时显示 @override void initState() { super.initState(); WidgetsBinding.instance.addPostFrameCallback( (_) { ShowCaseWidget.of(myContext).startShowCase([_one]); } ); }
@override
void initState() {
super.initState();
WidgetsBinding.instance.addPostFrameCallback(
(_) {
ShowCaseWidget.of(myContext).startShowCase([_one]);
}
);
}
@override
Widget build(BuildContext context) {
return ShowCaseWidget(
// onFinish: ,
builder:
Builder(builder: (context) {
myContext = context;
return Scaffold(
floatingActionButton: Showcase(
key: _one,
title: 'Title',
description: 'Desc',
child: InkWell(
onTap: () {},
child: FloatingActionButton(
onPressed: (){
print("floating");
}
)
),
),
);
}));
}
您可以使用
shared_preferencesclass IsFirstLaunchPage extends StatefulWidget {
static const PREFERENCES_IS_FIRST_LAUNCH_STRING = "PREFERENCES_IS_FIRST_LAUNCH_STRING";
@override
_IsFirstLaunchPageState createState() => _IsFirstLaunchPageState();
}
class _IsFirstLaunchPageState extends State<IsFirstLaunchPage> {
GlobalKey _one = GlobalKey();
BuildContext myContext;
@override
void initState() {
super.initState();
WidgetsBinding.instance.addPostFrameCallback(
(_) {
_isFirstLaunch().then((result){
if(result)
ShowCaseWidget.of(myContext).startShowCase([_one]);
});
}
);
}
@override
Widget build(BuildContext context) {
return ShowCaseWidget(
// onFinish: ,
builder:
Builder(builder: (context) {
myContext = context;
return Scaffold(
floatingActionButton: Showcase(
key: _one,
title: 'Title',
description: 'Desc',
child: InkWell(
onTap: () {},
child: FloatingActionButton(
onPressed: () {
print("floating");
}
)
),
),
);
}));
}
Future<bool> _isFirstLaunch() async{
final sharedPreferences = await SharedPreferences.getInstance();
bool isFirstLaunch = sharedPreferences.getBool(IsFirstLaunchPage.PREFERENCES_IS_FIRST_LAUNCH_STRING) ?? true;
if(isFirstLaunch)
sharedPreferences.setBool(IsFirstLaunchPage.PREFERENCES_IS_FIRST_LAUNCH_STRING, false);
return isFirstLaunch;
}
}
类IsFirstLaunchPage扩展StatefulWidget{
静态常量首选项\u是\u第一次\u启动\u字符串=“首选项\u是\u第一次\u启动\u字符串”；
@凌驾
_IsFirstLaunchPageState createState（）=>\u IsFirstLaunchPageState（）；
}
类_IsFirstLaunchPageState扩展状态{
GlobalKey _one=GlobalKey（）；
构建上下文myContext；
@凌驾
void initState（）{
super.initState（）；
WidgetsBinding.instance.addPostFrameCallback(
(_) {
_isFirstLaunch（）。然后（（结果）{
如果（结果）
ShowCaseWidget.of（myContext）.startShowCase（[[u one]）；
});
}
);
}
@凌驾
小部件构建（构建上下文）{
返回ShowCaseWidget(
//onFinish:，
建设者：
生成器（生成器：（上下文）{
myContext=上下文；
返回脚手架(
浮动操作按钮：Showcase(
钥匙：第一，
标题：“标题”，
描述：'Desc'，
孩子：InkWell(
onTap:（）{}，
子：浮动操作按钮(
已按下：（）{
打印（“浮动”）；
}
)
),
),
);
}));
}
Future\u isFirstLaunch（）异步{
final SharedReferences=等待SharedReferences.getInstance（）；
bool isFirstLaunch=sharedPreferences.getBool（IsFirstLaunchPage.PREFERENCES\u是\u FIRST\u LAUNCH\u字符串）？true；
如果（isFirstLaunch）
SharedReferences.setBool（IsFirstLaunchPage.PREFERENCES\u是\u FIRST\u LAUNCH\u字符串，false）；
返回第一次发射；
}
}
共享首选项class IsFirstLaunchPage extends StatefulWidget {
static const PREFERENCES_IS_FIRST_LAUNCH_STRING = "PREFERENCES_IS_FIRST_LAUNCH_STRING";
@override
_IsFirstLaunchPageState createState() => _IsFirstLaunchPageState();
}
class _IsFirstLaunchPageState extends State<IsFirstLaunchPage> {
GlobalKey _one = GlobalKey();
BuildContext myContext;
@override
void initState() {
super.initState();
WidgetsBinding.instance.addPostFrameCallback(
(_) {
_isFirstLaunch().then((result){
if(result)
ShowCaseWidget.of(myContext).startShowCase([_one]);
});
}
);
}
@override
Widget build(BuildContext context) {
return ShowCaseWidget(
// onFinish: ,
builder:
Builder(builder: (context) {
myContext = context;
return Scaffold(
floatingActionButton: Showcase(
key: _one,
title: 'Title',
description: 'Desc',
child: InkWell(
onTap: () {},
child: FloatingActionButton(
onPressed: () {
print("floating");
}
)
),
),
);
}));
}
Future<bool> _isFirstLaunch() async{
final sharedPreferences = await SharedPreferences.getInstance();
bool isFirstLaunch = sharedPreferences.getBool(IsFirstLaunchPage.PREFERENCES_IS_FIRST_LAUNCH_STRING) ?? true;
if(isFirstLaunch)
sharedPreferences.setBool(IsFirstLaunchPage.PREFERENCES_IS_FIRST_LAUNCH_STRING, false);
return isFirstLaunch;
}
}
类IsFirstLaunchPage扩展StatefulWidget{
静态常量首选项\u是\u第一次\u启动\u字符串=“首选项\u是\u第一次\u启动\u字符串”；
@凌驾
_IsFirstLaunchPageState createState（）=>\u IsFirstLaunchPageState（）；
}
类_IsFirstLaunchPageState扩展状态{
GlobalKey _one=GlobalKey（）；
构建上下文myContext；
@凌驾
void initState（）{
super.initState（）；
WidgetsBinding.instance.addPostFrameCallback(
(_) {
_isFirstLaunch（）。然后（（结果）{
如果（结果）
ShowCaseWidget.of（myContext）.startShowCase（[[u one]）；
});
}
);
}
@凌驾
小部件构建（构建上下文）{
返回ShowCaseWidget(
//onFinish:，
建设者：
生成器（生成器：（上下文）{
myContext=上下文；
返回脚手架(
浮动操作按钮：Showcase(
钥匙：第一，
标题：“标题”，
描述：'Desc'，
孩子：InkWell(
onTap:（）{}，
子：浮动操作按钮(
已按下：（）{
打印（“浮动”）；
}
)
),
),
);
}));
}
Future\u isFirstLaunch（）异步{
final SharedReferences=等待SharedReferences.getInstance（）；
bool isFirstLaunch=sharedPreferences.getBool（IsFirstLaunchPage.PREFERENCES\u是\u FIRST\u LAUNCH\u字符串）？true；
如果（isFirstLaunch）
SharedReferences.setBool（IsFirstLaunchPage.PREFERENCES\u是\u FIRST\u LAUNCH\u字符串，false）；
返回第一次发射；
}
}
class ExamCardModel {
String image;
String examName;
String time;
Widget icon;
Color startColor;
Color endColor;
ExamCardModel(
{this.image,
this.examName,
this.time,
this.icon,
this.startColor,
this.endColor});
}
class LessonsModel {
String image;
String title;
String backgroundImages;
LessonsModel({
this.image,
this.title,
this.backgroundImages,
});
}
class LiveModel {
String image;
String title;
String message;
String status;
LiveModel({
this.image,
this.title,
this.message,
this.status,
});
}
import 'package:cached_network_image/cached_network_image.dart';
import 'package:flutter/material.dart';
import 'package:nb_utils/nb_utils.dart';
import 'package:prokit_flutter/integrations/screens/Marquee/MHomePage.dart';
import 'package:prokit_flutter/main.dart';
import 'package:prokit_flutter/main/utils/AppWidget.dart';
import 'package:showcaseview/showcase.dart';
import 'package:showcaseview/showcase_widget.dart';
import 'ExamCardModel.dart';
import 'LessonsModel.dart';
import 'LiveVideo.dart';
class SVCHomePage extends StatefulWidget {
static String tag = '/SVCHomePage';
@override
_SVCHomePageState createState() => _SVCHomePageState();
}
const sdTextPrimaryColor = Color(0xFF000000);
const sdTextSecondaryColor = Color(0xFF757575);
const sdPrimaryColor = Color(0xFF3281FF);
const sdSecondaryColorRed = Color(0xFFFF5C5C);
class _SVCHomePageState extends State<SVCHomePage> {
// Global Variable to maintain the sequence of the ShowCaseView.
GlobalKey _one = GlobalKey();
GlobalKey _two = GlobalKey();
GlobalKey _three = GlobalKey();
BuildContext myContext;
BoxDecoration boxDecoration(
{double radius = 80.0, Color backGroundColor = sdPrimaryColor, double blurRadius = 8.0, double spreadRadius = 8.0, Color radiusColor = Colors.black12, Gradient gradient}) {
return BoxDecoration(
borderRadius: BorderRadius.circular(radius),
boxShadow: [
BoxShadow(
color: radiusColor,
blurRadius: blurRadius,
spreadRadius: spreadRadius,
),
],
color: backGroundColor,
gradient: gradient);
}
List<LessonsModel> lessons = [
LessonsModel(
image: 'images/smartDeck/images/sdearth.png',
title: 'GeoGraphy',
backgroundImages: 'https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcSePqEkOx6meh5aP5W0wRjvqCwDMFrpKyjFQA&usqp=CAU'),
LessonsModel(
image: 'images/smartDeck/images/sdruler.png',
title: 'Math',
backgroundImages: 'https://d2c7ipcroan06u.cloudfront.net/wp-content/uploads/2019/07/mathematics-696x364.jpg',
),
LessonsModel(
image: 'images/smartDeck/images/sdbiology.png',
title: 'Biology',
backgroundImages: 'https://physicsworld.com/wp-content/uploads/2019/09/dna-binary-code-255618778-Shutterstock_ymgerman.jpg'),
LessonsModel(
image: 'images/smartDeck/images/sdcomputer.png',
title: 'Computer',
backgroundImages: 'https://previews.123rf.com/images/aleksander1/aleksander11302/aleksander1130200018/18017241-bulb-made-of-computer-subjects-.jpg'),
LessonsModel(
image: 'images/smartDeck/images/sdmusic.png',
title: 'Music',
backgroundImages: 'https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcSePqEkOx6meh5aP5W0wRjvqCwDMFrpKyjFQA&usqp=CAU'),
LessonsModel(image: 'images/smartDeck/images/sddance.png', title: 'Dance', backgroundImages: 'https://i.pinimg.com/originals/30/45/9c/30459c328f5f535509d3131f773ab10f.jpg'),
];
List<LiveModel> liveVideo = [
LiveModel(
image: 'https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcTFX3JNvflemOpVIwXGd_BdLChYZefcPNWCAQ&usqp=CAU',
title: 'Talkshow',
message: 'Top 10 eco campus in \nindonesia that you can be..',
status: 'LIVE NOW'),
LiveModel(
image:
'https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcR4sfk7iQgjlNupZAy_A2HSv2hpgRm__UedzdvidFN8GAwd0SSKazIR2DwP39tHc0qUrNOERBaWBVvsds_wivtmBwjtOh8zRTz6kQ&usqp=CAU&ec=45690273',
title: 'Talkshow',
message: 'Top 5 colleges in \nIndia that you can be..',
status: 'LIVE NOW'),
LiveModel(
image: 'https://static01.nyt.com/images/2020/03/14/upshot/14up-colleges-remote/14up-colleges-remote-mediumSquareAt3X.jpg',
title: 'Talkshow',
message: 'Top 10 eco campus in \nindonesia that you can be..',
status: 'LIVE NOW'),
];
List<ExamCardModel> cards = [
ExamCardModel(
image: 'images/smartDeck/images/sdbiology.png',
examName: 'Biology final\nexams',
time: '15 minutes',
icon: Icon(
Icons.notifications_active,
color: Colors.white54,
),
startColor: Color(0xFF2889EB),
endColor: Color(0xFF0B56CB),
),
ExamCardModel(
image: 'images/smartDeck/images/sdchemistry.png',
examName: 'Chemistry daily\ntest',
time: '15 minutes',
icon: Icon(
Icons.notifications_off,
color: Colors.white54,
),
startColor: Color(0xFFF1AD4B),
endColor: Color(0xFFF26340),
),
ExamCardModel(
image: 'images/smartDeck/images/sdmusic.png',
examName: 'Music daily\nlearning',
time: '3 hours',
icon: Icon(
Icons.notifications,
color: Colors.white54,
),
startColor: Color(0xFF7EA56C),
endColor: Color(0xFF6C9258),
)
];
@override
void initState() {
super.initState();
// Start showcase view after current widget frames are drawn.
WidgetsBinding.instance.addPostFrameCallback((_) {
Future.delayed(Duration(milliseconds: 200), () => ShowCaseWidget.of(myContext).startShowCase([_one, _two, _three]));
});
}
@override
Widget build(BuildContext context) {
// keep all your content in Show Case Widget.
return ShowCaseWidget(
builder: Builder(
builder: (context) {
myContext = context;
return Scaffold(
appBar: appBar(context, 'Show Case View'),
body: Container(
child: Container(
child: SingleChildScrollView(
padding: EdgeInsets.only(top: 20, right: 15, left: 20, bottom: 16),
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Row(
children: <Widget>[
Expanded(
child: Showcase(
// Specify the key (i.e. in which place you want to show this showcase)
key: _one,
// Specify the title
title: 'Search',
// Add the Instruction
description: 'Search for lessons or exam',
child: Container(
decoration: boxDecoration(radius: 5, backGroundColor: Colors.white38, blurRadius: 0, spreadRadius: 0),
child: TextField(
style: TextStyle(fontSize: 20),
decoration: InputDecoration(
border: InputBorder.none,
hintText: 'Search',
prefixIcon: Icon(
Icons.search,
color: Colors.black,
),
),
),
),
),
),
Showcase(
description: 'See Notification',
key: _two,
title: 'Notification',
child: Stack(
children: <Widget>[
Container(
margin: EdgeInsets.only(left: 10),
padding: EdgeInsets.only(left: 10, top: 5, right: 15),
child: InkWell(
child: Icon(
Icons.notifications_none,
size: 30,
color: appStore.iconColor,
),
),
),
Positioned(
right: 9,
top: 0,
child: CircleAvatar(
radius: 10,
backgroundColor: Colors.red,
child: Text(
'3',
style: TextStyle(fontSize: 14, color: Colors.white),
),
),
)
],
),
),
],
),
SizedBox(
height: 25,
),
Text(
'Hi, John',
style: boldTextStyle(),
),
SizedBox(
height: 10,
),
Text(
'You have 3 exams pending',
style: TextStyle(fontSize: 14, color: Color(0xFF757575)),
),
SizedBox(
height: 15,
),
Container(
height: 250,
child: ListView.builder(
scrollDirection: Axis.horizontal,
itemCount: cards == null ? 0 : cards.length,
itemBuilder: (BuildContext context, int index) {
return InkWell(
child: Container(
width: 180.0,
margin: EdgeInsets.only(right: 15),
padding: EdgeInsets.all(8),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(5),
boxShadow: [
BoxShadow(
color: Colors.black12,
blurRadius: 8,
spreadRadius: 2,
),
],
gradient: LinearGradient(
colors: [cards[index].startColor, cards[index].endColor],
),
),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
CircleAvatar(
radius: 40,
backgroundColor: Colors.white30,
child: Image.asset(
cards[index].image,
height: 60,
width: 60,
),
),
SizedBox(
height: 15,
),
Text(
cards[index].examName,
style: secondaryTextStyle(color: Colors.white, size: 20),
),
SizedBox(
height: 15,
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(
cards[index].time,
style: secondaryTextStyle(color: Colors.white54, size: 18),
),
cards[index].icon
],
)
],
),
),
);
}),
),
SizedBox(
height: 25,
),
Row(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisSize: MainAxisSize.min,
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Expanded(
child: Text(
'Lessons',
style: boldTextStyle(size: 16),
),
),
InkWell(
child: Showcase(
description: 'Click to See all Lessons',
key: _three,
title: 'Lessons',
child: Text(
'SEE ALL',
style: boldTextStyle(color: sdPrimaryColor, size: 14),
),
),
),
],
),
SizedBox(
height: 5,
),
Text(
'Senior High School - 12th Grade',
style: secondaryTextStyle(size: 14),
),
SizedBox(
height: 5,
),
Container(
height: 150,
child: ListView.builder(
scrollDirection: Axis.horizontal,
itemCount: lessons.length,
itemBuilder: (BuildContext context, int index) {
return InkWell(
child: Container(
margin: EdgeInsets.only(right: 20),
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisSize: MainAxisSize.min,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
CircleAvatar(
radius: 30,
backgroundColor: Colors.white,
child: Image.asset(
lessons[index].image,
height: 30,
width: 30,
),
),
Container(
margin: EdgeInsets.only(top: 10),
child: Text(
lessons[index].title,
style: primaryTextStyle(size: 14),
),
)
],
),
),
);
}),
),
SizedBox(
height: 25,
),
Row(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisSize: MainAxisSize.min,
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Expanded(
child: Text(
'Live Video',
style: boldTextStyle(),
),
),
Text(
'SEE ALL',
style: boldTextStyle(color: sdPrimaryColor, size: 14),
),
],
),
SizedBox(
height: 20,
),
Container(
height: 130,
child: ListView.builder(
scrollDirection: Axis.horizontal,
itemCount: liveVideo.length,
shrinkWrap: true,
itemBuilder: (BuildContext context, int index) {
return Container(
margin: EdgeInsets.only(left: 20),
width: 300,
decoration: boxDecorationRoundedWithShadow(8,backgroundColor: appStore.appBarColor),
child: Row(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Container(
height: 130,
width: 115,
decoration: BoxDecoration(
borderRadius: BorderRadius.only(
topLeft: Radius.circular(5),
bottomLeft: Radius.circular(5),
),
color: appStore.appBarColor,
image: DecorationImage(
image: CachedNetworkImageProvider(liveVideo[index].image),
fit: BoxFit.fill,
),
),
),
SizedBox(width: 16),
Expanded(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(
liveVideo[index].title,
style: boldTextStyle(size: 16),
),
Padding(
padding: EdgeInsets.only(top: 6),
child: Align(
alignment: Alignment.topRight,
child: Icon(Icons.more_vert),
),
)
],
),
Container(
margin: EdgeInsets.only(top: 8),
color: appStore.appBarColor,
child: FittedBox(
child: Text(
liveVideo[index].message,
style: primaryTextStyle(size: 14),
maxLines: 2,
overflow: TextOverflow.ellipsis,
),
),
),
FittedBox(
child: Container(
margin: EdgeInsets.only(top: 15),
decoration: boxDecorations(bgColor: sdSecondaryColorRed, radius: 4),
padding: EdgeInsets.fromLTRB(10, 6, 10, 6),
child: Center(
child: Text(
liveVideo[index].status,
style: secondaryTextStyle(size: 8, color: Colors.white),
),
),
),
)
],
),
)
],
),
);
}),
)
],
),
),
),
),
);
},
),
);
}
}
import'package:cached_network_image/cached_network_image.dart'；
进口“包装：颤振/材料.省道”；
导入“包装：nb_utils/nb_utils.dart”；
导入“包：prokit_flift/integrations/screens/Marquee/MHomePage.dart”；
进口“包装：prokit_颤振/main.dart”；
导入“包：prokit_flatter/main/utils/AppWidget.dart”；
导入“包：showcaseview/showcase.dart”；
导入“package:showcaseview/showcase_widget.dart”；
导入“ExamCardModel.dart”；
导入“LessonsModel.dart”；
导入“LiveVideo.dart”；
类svc扩展StatefulWidget{
静态字符串标记='/svchope'；
@凌驾
_SVCHomePageState createState（）=>SVCHomePageState（）；
}
常量sdTextPrimaryColor=Color（0xFF000000）；
常量sdTextSecondaryColor=颜色（0xFF757575）；
常量sdPrimaryColor=Color（0xFF3281FF）；
常数sdSecondaryColorRed=颜色（0xFFFF5C5C）；
类_SVCHomePageState扩展状态{
//用于维护ShowCaseView序列的全局变量。
GlobalKey _one=GlobalKey（）；
GlobalKey _two=GlobalKey（）；
GlobalKey _three=GlobalKey（）；
构建上下文myContext；
盒子装饰盒子装饰(
{双半径=80.0，颜色背景色=sdPrimaryColor，双模糊半径=8.0，双扩散半径=8.0，颜色半径颜色=Colors.black12，渐变}）{
返回框装饰(
边界半径：边界半径。圆形（半径），
boxShadow：[
箱形阴影(
颜色：放射色，
模糊半径：模糊半径，
展宽半径：展宽半径，
),
],
颜色：背景色，
梯度：梯度）；
}
列出课程=[
莱森斯莫德(
图片：“images/smartDeck/images/sdearth.png”，
标题:"地理",，
背景图片：'https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcSePqEkOx6meh5aP5W0wRjvqCwDMFrpKyjFQA&usqp=CAU'),
莱森斯莫德(
图片：“images/smartDeck/images/sdruler.png”，
标题：“数学”，
背景图片：'https://d2c7ipcroan06u.cloudfront.net/wp-content/uploads/2019/07/mathematics-696x364.jpg',
),
莱森斯莫德(
图片：“images/smartDeck/images/sdbiology.png”，
标题:"生物学",，
背景图片：'https://physicsworld.com/wp-content/u