android - 错误：“I/Process (4121): Sending signal.PID: 4121 SIG: 9 Lost connection to device..”在 android studio 上使用颤振
问题描述
“发送信号。PID：4121 SIG：9 与设备的连接丢失”我从未在我的计算机的 Android Studio IDE 中看到过这个问题。但是当我在另一台计算机上导入这个项目并在模拟器中运行时，我看到了那个错误。这是一个电子商务项目。登录成功后，应用程序将显示主页。主页将显示来自 firebase 的产品。但应用程序退出。
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:ecommercedemo/main.dart';
import 'package:ecommercedemo/screens/Cart.dart';
import 'package:ecommercedemo/screens/product_details_page.dart';
import 'package:ecommercedemo/screens/profile_page.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/painting.dart';
import 'package:flutter/rendering.dart';
class HomePage extends StatefulWidget {
//const HomePage({Key? key}) : super(key: key);
String? category;
HomePage(String category){
this.category=category;
}
@override
_HomePageState createState() => _HomePageState(category!);
}
class _HomePageState extends State<HomePage> {
String? category;
_HomePageState(String category){
this.category=category;
}
int m=0;
@override
Widget build(BuildContext context) {
final size=MediaQuery.of(context).size;
return Scaffold(
//backgroundColor: Colors.white,
appBar: AppBar(
backgroundColor: Colors.white,
title: Padding(
padding: const EdgeInsets.only(left: 0),
child: Container(
width: double.infinity,
height: 40,
decoration: BoxDecoration(
color: Colors.white, borderRadius: BorderRadius.circular(5)),
child: Center(
child: TextField(
decoration: InputDecoration(
enabledBorder: OutlineInputBorder(
borderRadius: BorderRadius.circular(10)
),
prefixIcon: Icon(Icons.search),
suffixIcon: IconButton(
icon: Icon(Icons.clear),
onPressed: () {
/* Clear the search field */
},
),
hintText: 'Search...',
border: InputBorder.none),
),
),
),
),
// actions: <Widget>[
// IconButton(icon: Icon(Icons.search),
// onPressed: () {
// //showSearch(context: context, delegate: DataSearch(listWords));
// })
// ],
),
body: Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
children: [
Expanded(
flex: 30,
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Container(
decoration: BoxDecoration(
color: Color(0xffffaf38),
borderRadius: BorderRadius.circular(15)
),
alignment: Alignment.center,
height: 100,
width: size.width,
child: SingleChildScrollView(
scrollDirection: Axis.horizontal,
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Row(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.center,
children: [
Column(
children: [
ElevatedButton(
style: ElevatedButton.styleFrom(
primary: Colors.black,
shape: CircleBorder(),
//padding: EdgeInsets.all(30)
),
onPressed: (){
mode=1;
Navigator.pushAndRemoveUntil(context, MaterialPageRoute(builder: (context)=>HomePage('Kids')), (route) => false);
},
child: CircleAvatar(
backgroundImage: AssetImage("images/kids.png"),
radius: 30,
),
),
Text("Kids")
],
),
Column(
children: [
ElevatedButton(
style: ElevatedButton.styleFrom(
primary: Colors.white,
shape: CircleBorder(),
//padding: EdgeInsets.all(30)
),
onPressed: (){
mode=2;
Navigator.pushAndRemoveUntil(context, MaterialPageRoute(builder: (context)=>HomePage('Device')), (route) => false);
},
child: CircleAvatar(
backgroundImage: AssetImage("images/mensitem.png"),
radius: 30,
),
),
Text('Devices')
],
),
Column(
children: [
ElevatedButton(
onPressed: (){
mode=3;
Navigator.pushAndRemoveUntil(context, MaterialPageRoute(builder: (context)=>HomePage('men')), (route) => false);
},
child: CircleAvatar(
backgroundImage: AssetImage("images/men's.png"),
radius: 30,
),
style: ElevatedButton.styleFrom(
primary: Colors.white,
shape: CircleBorder()
),
),
Text("Men's")
],
),
Column(
children: [
ElevatedButton(
onPressed: (){
mode=4;
Navigator.pushAndRemoveUntil(context, MaterialPageRoute(builder: (context)=>HomePage("Women")), (route) => false);
},
child: CircleAvatar(
backgroundImage: AssetImage("images/girls.png"),
radius: 30,
),
style: ElevatedButton.styleFrom(
primary: Colors.white,
shape: CircleBorder()
),
),
Text("Women")
],
),
Column(
children: [
ElevatedButton(
onPressed: (){
mode=5;
Navigator.pushAndRemoveUntil(context, MaterialPageRoute(builder: (context)=>HomePage('electronics')), (route) => false);
},
child: CircleAvatar(
backgroundImage: AssetImage("images/Devices.png"),
radius: 30,
),
style: ElevatedButton.styleFrom(
primary: Colors.white,
shape: CircleBorder()
),
),
Text("Electronics")
],
)
],
),
),
),
),
),
),
Expanded(
flex: 70,
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Container(
decoration: BoxDecoration(
color: Color(0xffffaf38),
borderRadius: BorderRadius.circular(15)
),
alignment: Alignment.center,
height: size.height,
width: size.width,
child: _buildcondition(category!)
// Column(
// children: [
// _buildDefuListView()
// // if (mode == 0) ...[
// // _buildDefuListView()
// // ] else if (mode == 5) ...[
// // _buildListView(mode)
// // ]
// ],
// ),
),
),
),
],
),
),
drawer: Drawer(
child: ListView(
children: [
UserAccountsDrawerHeader(
accountName: Text("Gunjon Roy"),
accountEmail: Text("gunjon.cse@gmail.com"),
currentAccountPicture: CircleAvatar(
radius: 20,
backgroundImage: AssetImage("images/men's.png"),
child: Text("Edit"),
),
),
ListTile(
leading: Icon(Icons.shopping_cart),
title: Text("Carts"),
onTap: (){
print("hello world<<<<<<<<<<<<>>>>>>>>>>>>>>");
},
)
],
),
),
bottomNavigationBar: Container(
height: MediaQuery.of(context).size.height * 0.06,
color: Colors.white,
child: Row(
children: [
SizedBox(
width: MediaQuery.of(context).size.width * 0.03,
),
FlatButton(
onPressed: () {},
child: Text(
'Explore',
style: TextStyle(color: Color(0xFFfca903)),
)),
SizedBox(
width: MediaQuery.of(context).size.width * 0.15,
),
FlatButton(
onPressed: () {
Navigator.push(context, MaterialPageRoute(builder: (context)=>Cart()));
},
child: Icon(
Icons.add_shopping_cart,
color: Color(0xFFfca903),
)),
SizedBox(
width: MediaQuery.of(context).size.width * 0.12,
),
FlatButton(
onPressed: () {
Navigator.push(context, MaterialPageRoute(builder: (context)=>Profile()));
},
child: Icon(
Icons.perm_identity_outlined,
color: Color(0xFFfca903),
)),
],
),
),
);
}
Widget _buildListView(String mode){
// String? who;
// if(number==5){
// who="kids";
// }else if(number==16){
// who="boys";
// }else if(number==18){
// who="mens";
// }else if(number==21){
// who="girls";
// }else{
// who="";
// }
//var item = '';
final size=MediaQuery.of(context).size;
return StreamBuilder<QuerySnapshot>(
stream: Firestore.instance.collection('product').document(mode).collection(mode).snapshots(),
builder: (BuildContext context,
AsyncSnapshot<QuerySnapshot> snapshot) {
if (!snapshot.hasData) {
return Center(child: Column(
children: [
CircularProgressIndicator(),
Text('Loading...',style: TextStyle(color: Colors.white),),
],
));
} else
return SingleChildScrollView(
child: ListView(
physics: NeverScrollableScrollPhysics(),
scrollDirection: Axis.vertical,
shrinkWrap: true,
children: snapshot.data!.documents.map((document){
return ElevatedButton(
style: ElevatedButton.styleFrom(
primary: Color(0xFFff9f36)
),
onPressed:(){
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => Details(
mode,
document['name'] ?? '',
document['details'] ?? '',
document['price'] ?? '',
document['imageUrl'] ?? ''
)));
},
child: ListTile(
title: Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: [
//NetworkImage(),
Card(
elevation: 20,
color: Colors.white,
//BoxDecoration(color: Colors.black)
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.all(
Radius.circular(15),
),
side:
BorderSide(color: Colors.black)),
child: Container(
height: MediaQuery.of(context).size.height * 0.35,
width: MediaQuery.of(context).size.width * 0.45,
child: Image(
image: NetworkImage(
document['imageUrl'] ?? '')),
),
),
Padding(
padding: const EdgeInsets.only(left: 0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
document['name'] ?? '',
style: TextStyle(color: Colors.white),
),
Text(
document['details'] ?? '',
style: TextStyle(color: Colors.white),
),
Text(
document['price'] ?? '',
style: TextStyle(color: Colors.white),
),
SizedBox(height: MediaQuery.of(context).size.height * 0.015,)
],
),
),
],
),
),
);
}).toList()),
);
}
);
// ListView.builder(
// scrollDirection: Axis.vertical,
// itemCount: number,
// itemBuilder: (BuildContext context, int index) {
// return Padding(
// padding: const EdgeInsets.only(bottom: 20),
// child: Container(
// decoration: BoxDecoration(
// color: Colors.grey,
// borderRadius: BorderRadius.circular(15)
// ),
// width: 50,
// height: 100,
// //child: SizedBox(width: 20,),
// ),
// );
// },
// );
}
Widget _buildDefuListView(var mode){
final size=MediaQuery.of(context).size;
return Column(
//crossAxisAlignment: CrossAxisAlignment.center,
children: [
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text("Best Selling",
style: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 20,
color: Colors.white
),
),
SizedBox(width: size.width*.3,),
// ElevatedButton(
// style: ElevatedButton.styleFrom(
// primary: Colors.white
// ),
// onPressed: (){
//
// }, child: Text("See all",
// style: TextStyle(
// fontWeight: FontWeight.bold,
// fontSize: 20,
// color: Colors.white
// ),
// )
// )
TextButton(
onPressed: (){
},
child: Text("See all",
style: TextStyle(
fontSize: 20,
fontWeight: FontWeight.bold,
color: Colors.white
),
)
),
],
),
StreamBuilder<QuerySnapshot>(
stream: Firestore.instance.collection('product').document(mode).collection(mode).snapshots(),
builder: (BuildContext context,
AsyncSnapshot<QuerySnapshot> snapshot) {
if (!snapshot.hasData) {
return Center(child: Column(
children: [
CircularProgressIndicator(),
Text('Loading...',style: TextStyle(color: Colors.white),),
],
));
} else
return SingleChildScrollView(
child: ListView(
physics: NeverScrollableScrollPhysics(),
//physics: BouncingScrollPhysics(),
scrollDirection: Axis.vertical,
shrinkWrap: true,
children: snapshot.data!.documents.map((document){
return ElevatedButton(
style: ElevatedButton.styleFrom(
primary: Color(0xFFff9f36)
),
onPressed:(){
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => Details(
mode,
document['name'] ?? '',
document['details'] ?? '',
document['price'] ?? '',
document['imageUrl'] ?? ''
)));
},
child: ListTile(
title: Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: [
//NetworkImage(),
Card(
elevation: 20,
color: Colors.white,
//BoxDecoration(color: Colors.black)
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.all(
Radius.circular(15),
),
side:
BorderSide(color: Colors.black)),
child: Container(
height: MediaQuery.of(context).size.height * 0.35,
width: MediaQuery.of(context).size.width * 0.45,
child: Image(
image: NetworkImage(
document['imageUrl'] ?? '')),
),
),
Padding(
padding: const EdgeInsets.only(left: 0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
document['name'] ?? '',
style: TextStyle(color: Colors.white),
),
Text(
document['details'] ?? '',
style: TextStyle(color: Colors.white),
),
Text(
document['price'] ?? '',
style: TextStyle(color: Colors.white),
),
SizedBox(height: MediaQuery.of(context).size.height * 0.015,)
],
),
),
],
),
),
);
}).toList()),
);
}
),
],
);
}
Widget _buildcondition(String mode){
if(mode=='women'){
return _buildListView(mode);
}
else if(mode=='men'){
return _buildListView(mode);
}
else if(mode=='Device'){
return _buildListView(mode);
}
else if(mode=='Kids'){
return _buildListView(mode);
}
else if(mode=='electronics'){
return _buildListView(mode);
}
else{
return _buildListView('women');
//_buildListView('women');
}
}
}
解决方案
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