问题描述
════════ Exception caught by widgets library ═══════════
The following ArgumentError was thrown building MyHomePage(dirty,dependencies: [MediaQuery,_EffectiveTickerMode],state: _MyHomePageState#7da5f(ticker inactive)):
Invalid argument(s)
**The Tracker showing the following reasons:**
The relevant error-causing widget was:
MyHomePage file:///F:/Orangebd/app/GoogleDriveClone-Flutter/lib/Screen/Home.dart:37:15
When the exception was thrown,this was the stack:
#0 _StringBase.+ (dart:core-patch/string_patch.dart:272:57)
#1 _MyHomePageState.build (package:googledriveclone_Flutter/Screen/Home.dart:133:45)
#2 StatefulElement.build (package:Flutter/src/widgets/framework.dart:4716:27)
#3 ComponentElement.performRebuild (package:Flutter/src/widgets/framework.dart:4599:15)
#4 StatefulElement.performRebuild (package:Flutter/src/widgets/framework.dart:4772:11)
...
══════════════════════════════════════════
在那个错误期间，屏幕看起来像这样
这是我的主页代码
import 'package:fab_circular_menu/fab_circular_menu.dart';
//import 'package:file_picker/file_picker.dart';
import 'package:floating_action_bubble/floating_action_bubble.dart';
import 'package:Flutter/cupertino.dart';
import 'package:Flutter/material.dart';
import 'package:Flutter/services.dart';
import 'package:get/get.dart';
import 'package:googledriveclone_Flutter/Screen/Files.dart';
import 'package:googledriveclone_Flutter/Screen/HomeScreen.dart';
import 'package:googledriveclone_Flutter/Screen/LoginPage.dart';
import 'package:googledriveclone_Flutter/Screen/Profile.dart';
import 'package:googledriveclone_Flutter/Widget/constants.dart';
import 'package:prompt_dialog/prompt_dialog.dart';
import 'package:sk_alert_dialog/sk_alert_dialog.dart';
import 'package:storage_capacity/storage_capacity.dart';
import 'IssudFile.dart';
void main() {
runApp(HomePage());
}
class HomePage extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
try {
return MaterialApp(
debugShowCheckedModeBanner: false,title: 'Digilocker',theme: ThemeData(
primarySwatch: Colors.blue,visualDensity: VisualDensity.adaptivePlatformDensity,),home: MyHomePage(title: 'Digilocker'),);
}
catch(e){
print('Loading expception of page'+e.toString());
}
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key,this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> with SingleTickerProviderStateMixin {
Widget _widgetBody = HomeScreen();
int _currrentIndex = 0;
Animation<double> _animation;
AnimationController _animationController;
TextEditingController _foldername = TextEditingController();
String _fileName;
var scaffoldKey = GlobalKey<ScaffoldState>();
bool isFolder;
double _diskSpace = 0;
var _freespace ;
var _freespacemb;
var _occupiedspace ;
var _totalSpace;
@override
void initState() {
// Todo: implement initState
// _controller.addListener(() => _extension = _controller.text);
_getStorgeInfo();
_animationController = AnimationController(
vsync: this,duration: Duration(milliseconds: 300),);
final curvedAnimation = CurvedAnimation(curve: Curves.easeInOut,parent: _animationController);
_animation = Tween<double>(begin: 0,end: 1).animate(curvedAnimation);
// initdiskSpace();
super.initState();
}
@override
void dispose() {
_animationController.dispose();
super.dispose();
}
void _onItemTapped(int index) async{
setState(() {
if(index == 0){
_currrentIndex = index;
_widgetBody = HomeScreen();
}
else if(index == 1){
_currrentIndex = index;
_widgetBody = MyIssuedDocScreen();
}
else if(index == 2){
_currrentIndex = index;
_widgetBody = Center(child: Text('Shared documents'),);
}
else if(index == 3){
_currrentIndex = index;
_widgetBody = MyDriveScreen();
}
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
key: scaffoldKey,endDrawerEnableOpenDragGesture: false,// This way it will not open
// endDrawer: Drawer(),drawer: new Drawer(
elevation: 10,child: new ListView(
padding: EdgeInsets.all(0),children: <Widget>[
DrawerHeader(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceAround,crossAxisAlignment: CrossAxisAlignment.center,children: [
Image.asset('assets/digi_locker.png',width: MediaQuery.of(context).size.width*0.30,SizedBox(height: 10,Text('Available space: '+_freespace+'\t (MB)'),]
),decoration: Boxdecoration(
color: kPrimaryLightColor,ListTile(
leading: Icon(Icons.person),title: Text('My profile'),onTap: () {
// Get.back();
Get.to(profilePage());
},Divider(),ListTile(
leading: Icon(Icons.create_new_folder),title: Text('Create folder'),onTap: () {
// Get.back();
_showMyDialog();
},ListTile(
leading: Icon(Icons.cloud_upload_rounded),title: Text('File upload'),onTap: () {
// Get.back();
},ListTile(
leading: Icon(Icons.six_ft_apart_outlined),title: Text('Issued documents'),ListTile(
leading: Icon(Icons.translate_rounded),title: Text('Change lagnuage'),onTap: () {
// Get.back();
//Get.offAll(LoginPage());
//Do some stuff here
//Closing programmatically - very less practical use
scaffoldKey.currentState.openEndDrawer();
},ListTile(
leading: Icon(Icons.logout),title: Text('logout'),onTap: () {
// Get.back();
Get.offAll(LoginPage());
//Do some stuff here
//Closing programmatically - very less practical use
scaffoldKey.currentState.openEndDrawer();
},)
],appBar: AppBar(
elevation: 0,backgroundColor: Colors.white,brightness: Theme.of(context).brightness,title: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,children:
[
Expanded(
child: Container(
decoration: Boxdecoration(
borderRadius: BorderRadius.all(Radius.circular(35)),color: Colors.grey.shade50,child: TextFormField(
decoration: Inputdecoration(
hintText: "Search in locker",border: InputBorder.none,icon: Container(
margin: EdgeInsets.only(left: 10),child: Icon(Icons.search,color: kPrimaryColor,)
),]
),iconTheme: IconThemeData(color: kPrimaryColor),actions: <Widget>[
IconButton(
onpressed: (){
print("Sync started");
showSnackMessage(context,"Sync Started please wait...",scaffoldKey,'');
},icon: Icon(
Icons.sync,color:kPrimaryColor,IconButton(
icon: Container(
height: 50,width: 50,margin: EdgeInsets.all(5),child: CircleAvatar(
radius: 14.0,backgroundColor: Colors.grey[200],backgroundImage: NetworkImage("https://qph.fs.quoracdn.net/main-qimg-11ef692748351829b4629683eff21100.webp"),onpressed: () {
// do something
},)
],body: SafeArea(
child: Container(
padding: EdgeInsets.all(15.0),child: _widgetBody
),floatingActionButtonLocation: FloatingActionButtonLocation.endFloat,//Init Floating Action Bubble
floatingActionButton: FloatingActionBubble(
// Menu items
items: <Bubble>[
// Floating action menu item
Bubble(
title:"Upload",iconColor :kPrimaryColor,bubbleColor : Colors.white.withOpacity(0.9),titleStyle:TextStyle(fontSize: 16,color: kPrimaryColor),icon:Icons.cloud_upload,onPress: () {
// OpenFilePicker();
_animationController.reverse();
_openFileType(context);
},// Floating action menu item
Bubble(
title:"Folder",icon:Icons.create_new_folder,onPress: () {
_animationController.reverse();
print('creating folder');
_showMyDialog();
},//Floating action menu item
],// animation controller
animation: _animation,// On pressed change animation state
onPress: _animationController.isCompleted
? _animationController.reverse
: _animationController.forward,// Floating Action button Icon color
iconColor: kPrimaryColor,// Flaoting Action button Icon
icon: AnimatedIcons.menu_close,bottomNavigationBar: BottomNavigationBar(
currentIndex: _currrentIndex,type: BottomNavigationBarType.fixed,showSelectedLabels: true,showUnselectedLabels: true,selectedItemColor: kPrimaryColor,onTap: _onItemTapped,items: [
BottomNavigationBarItem(
icon: _currrentIndex==0?Icon(Icons.home,size: 25,):Icon(Icons.home_outlined,size: 25),title: Text("Home")
),BottomNavigationBarItem(
icon: _currrentIndex==1?Icon(Icons.file_download_done,):Icon(Icons.file_download_done_outlined,title: Text("Issued")
),BottomNavigationBarItem(
icon: _currrentIndex==2?Icon(Icons.supervised_user_circle,):Icon(Icons.supervised_user_circle,title: Text("Shared")
),BottomNavigationBarItem(
icon: _currrentIndex==3?Icon(Icons.folder,):Icon(Icons.folder_open,title: Text("My locker")
),],);
}
Future<void> _showMyDialog() async {
return showDialog<void>(
context: context,barrierdismissible: false,// user must tap button!
builder: (BuildContext context) {
return AlertDialog(
backgroundColor: Colors.white,elevation: 13,content: TextField(
onChanged: (value) { },controller: _foldername,decoration: Inputdecoration(hintText: "your folder/directory name",suffixIcon: IconButton(
onpressed: () => _foldername.clear(),icon: Icon(Icons.clear),actions: <Widget>[
TextButton(
child: Text('Cancel',style: TextStyle(color: Colors.red),onpressed: () {
//Navigator.pop(_);
Navigator.of(context).pop();
// _animationController.reverse();
},TextButton(
child: Text('Create',style: TextStyle(color: kPrimaryColor),onpressed: () {
createFolder(context,_foldername.text.toString()) ;
Get.back();
//Navigator.of(context).pop();
// _animationController.reverse();
},);
},);
}
void _openFileType(BuildContext context) {
SKAlertDialog.show(
context: context,type: SKAlertType.radiobutton,radioButtonAry: {'Certificate': 1,'Signature': 2,'NID': 3,'Passport': 4,'Driving licence': 5},title: 'Choose File category',onCancelBtnTap: (value) {
print('Cancel Button Tapped');
Navigator.of(context).pop(false);
},onRadioButtonSelection: (value) {
print('onRadioButtonSelection $value');
},);
}
/* Future<void> initdiskSpace() async {
double diskSpace = 0;
diskSpace = await diskSpace.getFreediskSpace;
if (!mounted) return;
setState(() {
_diskSpace = diskSpace;
});
}
*/
Future<void> _getStorgeInfo() async{
_freespace = await StorageCapacity.getFreeSpace;
//_freespacemb = await StorageCapacity.toMegaBytes(double.parse(_freespace.toString()));
_occupiedspace = await StorageCapacity.getoccupiedspace;
_totalSpace = await StorageCapacity.getTotalSpace;
}
}
注意：如果我热重载这个页面，它又可以正常工作了
请帮忙。
解决方法
问题是，您正在 initState 方法中获取数据，但是在将数据初始化为 _freespace 之前，您的小部件的构建已经完成，这就是出现错误的原因。
作为解决方案，我建议从 _getStorgeInfo() 中删除 initState 调用，并实现以下结构：
@override
Widget build(BuildContext context) {
return Scaffold(
key: scaffoldKey,endDrawerEnableOpenDragGesture: false,// This way it will not open
// endDrawer: Drawer(),drawer: new Drawer(
...
),appBar: AppBar(
...
),body: SafeArea(
child: Container(
padding: EdgeInsets.all(15.0),child: FutureBuilder(
future: _getStorgeInfo(),builder: (context,snapshot) {
if(snapshot.connectionState!=ConnectionState.Done) return CircularProgressIndicator();
return _widgetBody;
},),));
}