我在flutter应用程序中遇到了非常奇怪的问题！当测试我的应用程序在调试模式下工作正常，而在发布模式下它显示白屏。这个应用程序已经发布在playstore。几天后，我改变了这个应用程序。我想发布第二个版本。当我试图建立发布apk它显示白屏，而在调试模式下工作正常。为什么会发生这种情况？是flutter版本的问题？
下面是代码
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
import 'package:tv/Online.dart';
import 'package:tv/paypal.dart';
import 'package:url_launcher/url_launcher.dart';
class Donateus extends StatefulWidget {
@override
_DonateusState createState() => _DonateusState();
}
class _DonateusState extends State<Donateus> {
bool _isExpandedonline=false;
bool _isExpandedpaypal=false;
bool _isExpandedetransfer=false;
bool _isExpandedtexttogive=false;
void customLaunch(command) async {
if (await canLaunch(command)) {
await launch(command);
} else {
print(' could not launch $command');
}
}
@override
void initState() {
// TODO: implement initState
super.initState();
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: SingleChildScrollView(
scrollDirection: Axis.vertical,
child:Padding(
padding: EdgeInsets.all(10),
child: Container(
child:Expanded(
child: Column(
children: <Widget>[
Text(
'WAYS TO DONATE',
style: TextStyle(
fontFamily: 'TT NORMS',
fontSize: 20,
fontWeight: FontWeight.w100,
),
),
Padding(
padding: EdgeInsets.only(left: 10),
child: Text(
'All of our Donations are processed through Cornerstone Asian Church.We are a registered Canadian Charity (842869265RR0001). A Canadian Tax-deductible receipt will be issued to you.',
style: TextStyle(
fontSize: 14
),
),
),
Padding(
padding: EdgeInsets.only(left: 10),
child: ExpansionTile(
onExpansionChanged: (value) {
_isExpandedonline=value;
setState(() {});
},
children: <Widget>[
Text(
'Give a single gift, or schedule a recurring amount by using your Credit cards (i.e Mastercard, VISA, AMEX).'
'Note: Cornerstone uses the giving provider, Tithe.ly to securely process online donations from all over the world. Our Church will cover all associated fees for this service which are 2.5% + 15 cents (CAD) for all Credit Cards. AMEX is 3.5% + 30 cents (CAD). However, if you wish to cover the fees as well, you can click on the option to "Cover Fees".',style: TextStyle(
fontSize: 14,
),)
],
title: Row(
children: <Widget>[
Image.asset(
'images/online.png',
),
GestureDetector(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => Online()),
);
},
child: Text(
'Online Giving',
style: TextStyle(
fontFamily: 'TT NORMS',
fontSize: 18,
fontWeight: FontWeight.w100,
color: _isExpandedonline ? Colors.amber[800] : Colors.black,
),
),
)
],
)),
),
Padding(
padding: EdgeInsets.only(left: 10),
child: ExpansionTile(
onExpansionChanged: (value) {
_isExpandedpaypal=value;
setState(() {});
},
children: <Widget>[
Text(
'You can send your funds through PayPal to email livinghopetv@cornerstoneasianchurch.com',style: TextStyle(
fontSize: 14,
),)
],
title: Row(
children: <Widget>[
Image.asset(
'images/paypal.png',
),
Padding(
padding: EdgeInsets.only(left: 10),
child: Text(
'PAYPAL',
style: TextStyle(
fontFamily: 'TT NORMS',
color:_isExpandedpaypal ? Colors.amber[800] : Colors.black,
fontSize: 18,
fontWeight: FontWeight.w100,
),
),
),
GestureDetector(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => paypal()),
);
},
child: Image.asset(
'images/donatebutton.png',
height: 33,
),
)
],
)),
),
Padding(
padding: EdgeInsets.only(left: 10),
child: ExpansionTile(
onExpansionChanged: (value) {
_isExpandedetransfer=value;
setState(() {});
},
children: <Widget>[
Text(
'You can send your funds via Interac E-Transfer to email*',style: TextStyle(
fontSize: 14,
),),
Text(
'
cacoffering@gmail.com',
style: TextStyle(
color: Colors.blue,
fontSize: 18,
),
),
Text(
'
This is an auto-deposit account
so you you do not have to set up any password.
Please do indicate the Purpose for your donation.
This service is only available within Canada.',style: TextStyle(
fontSize: 14,
),),
],
title: Row(
children: <Widget>[
Image.asset(
'images/etransfer.png',
height: 28,
),
Text(
'INTERAC E-TRANSFER',
style: TextStyle(
fontFamily: 'TT NORMS',
fontSize: 18,
fontWeight: FontWeight.w100,
color:_isExpandedetransfer? Colors.amber[800] : Colors.black,
),
),
],
)),
),
Padding(
padding: EdgeInsets.only(left: 10),
child: ExpansionTile(
onExpansionChanged: (value) {
_isExpandedtexttogive=value;
setState(() {});
},
children: <Widget>[
Text('STEP 1: TEXT the word GIVE to',style: TextStyle(
fontSize: 14,
),),
Text(
'(844) 329-1637',
style: TextStyle(
color: Colors.red,
),
),
SizedBox(
height: 20,
),
Text(
'STEP 2: Complete the information on link received via TEXT for the first time only.',style:TextStyle(
fontSize: 14,
),),
SizedBox(
height: 20,
),
Text(
'STEP 3: Once you are setup for TEXT GIVING you can continue to TEXT the amount without having to fill your information again. Simply TEXT the amounti.e 10, 15 etc to the number directly.',style: TextStyle(
fontSize: 14,
),)
],
title: Row(
children: <Widget>[
Image.asset(
'images/text.png',
height: 30,
),
GestureDetector(
onTap: () {
customLaunch('sms:8443291637');
},
child: Padding(
padding: EdgeInsets.only(left: 10),
child: Text(
'TEXT TO GIVE',
style: TextStyle(
fontSize: 18,
fontWeight: FontWeight.w100,
fontFamily: 'TT NORMS',
color:_isExpandedtexttogive? Colors.amber[800] : Colors.black,
),
),
),
)
],
)),
),
],
),
),
),
),
),
);
}
}
6条答案
按热度按时间km0tfn4u1#
问题是您不能将Expand用作父控件，这意味着Expanded widget必须是子控件或父控件，在调试模式下，您可以在终端中清楚地看到
Incorrect Usage of Parent Widget，它将在调试模式下工作，但在发布版本中将显示空白页面，因此请留意上述警告或错误用法不正确
示例
在行/列中
zfciruhq2#
不幸的是，这个问题可能有不止一个原因。我经历过的一个原因是，对于Android版本，minifyEnabled似乎是默认打开的。
构建按预期运行，仅仅设置useProfuard为true，其他设置为false就可以像以前一样缩减代码;因为模糊处理。有关详细信息，请参阅https://medium.com/@swav.kulinski/flutter-and-android-obfuscation-8768ac544421
gv8xihay3#
当我将gradle版本从gradle-5.6.2-all升级到gradle-6.1.1-all并构建gradlecom.android.tools.build：gradle：3.5.0到com.android.tools.build：gradle：4.0.1时
最后，我得到了我在app/buidl.gradle文件中添加的解决方案。
mklgxw1f4#
检查android清单中的android.permission.INTERNET
pxyaymoc5#
如果你在释放器或配置文件模式下得到这样的空屏幕，应该是小部件库异常。你可以在调试应用程序时在调试控制台捕捉异常。
在您的代码中，我看到
SingleChildScrollView中有无用的Container和Expanded小部件。考虑删除它们，应该会有所帮助。ddrv8njm6#
我也遇到过同样的问题，当然，这是我的错。我尝试过更改
buildconfig.release配置，使用不同的gradle版本，删除风味，但这只是简单的异步错误，数据在初始化（获取）之前就开始显示。应用程序在调试模式下工作正常，但在发布时显示白屏。错误与真实原因完全不同：如果您点击白色屏幕，则会显示如下消息：