小编mar*_*ony的帖子

我在颤振应用程序中面临非常奇怪的问题！在调试模式下测试我的应用程序时它工作正常，而在发布模式下它显示白屏。此应用程序已在 Playstore 中发布。几天后我改变了这个应用程序。我想发布第二个版本。当我尝试构建发布 apk 时，它在调试模式下工作正常时显示白屏。为什么会发生？是flutter版本问题吗？

这是代码

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: …

在检查控制台后，我尝试使用简单的方法在网站上实现一个信号通知，它向我显示此错误。如何在我的网站中实现单一信号通知？

        <script src="https://cdn.onesignal.com/sdks/OneSignalSDK.js" async=""></script>
    <script>
      window.OneSignal = window.OneSignal || [];
      OneSignal.push(function() {
        OneSignal.init({
          appId: "c208302-0-284011-12E8D",
        });
      });
    </script>



ServiceWorkerManager.js:399 [Service Worker Installation] Installing service worker failed TypeError: Failed to register a ServiceWorker for scope ('https://www.simplenikah.pk/') with script ('https://www.simplenikah.pk/OneSignalSDKWorker.js?appId=c3aca046-2d30-4703-9454-c9f2666e3ac1'): A bad HTTP response code (404) was received when fetching the script.
(anonymous) @ ServiceWorkerManager.js:399
a @ tslib.es6.js:63
/OneSignalSDKWorker.js?appId=c3aca046-2d30-4703-9454-c9f2666e3ac1:1 Failed to load resource: the server responded with a status of 404 ()
OneSignalError.js:18 Uncaught (in promise) Pe: Registration of a Service Worker …

我正在使用 post 方法向我的后端 php 服务器提交数据。后台数据提交成功。问题是，当单击提交数据时，必须清除表单，因此用户无法再次单击提交按钮。我不知道如何在单击提交按钮后禁用清除表单字段。

import 'dart:io';

import 'package:dio/dio.dart';
import 'package:file_picker/file_picker.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_app/ui/Home.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:path/path.dart';

import 'InputDeco_design.dart';

class Prayerequest extends StatefulWidget {
  @override
  _PrayerequestState createState() => _PrayerequestState();
}

class _PrayerequestState extends State<Prayerequest> {
  TextEditingController _name = TextEditingController();
  TextEditingController _email = TextEditingController();
  TextEditingController _phone = TextEditingController();
  TextEditingController _country= TextEditingController();
  TextEditingController _description = TextEditingController();
  //TextController to read text entered in text field
  final GlobalKey<FormState> _formkey = GlobalKey<FormState>();
  final GlobalKey<ScaffoldState> _scaffoldstate = new GlobalKey<ScaffoldState>();



  void _prayerrequest() async …

你好朋友，我现在在应用程序中使用路径提供程序插件，我也想添加音频播放器插件，当我尝试在我的应用程序中安装音频包时，它显示此错误，请帮助我，如果使用路径提供程序，为什么无法在我的应用程序中安装音频包包路径提供商对音频插件有任何问题吗？

Because examplecode depends on audioplayers ^0.16.2 which depends on path_provider ^1.6.22, path_provider ^1.6.22 is required.
So, because examplecode depends on path_provider ^0.4.1, version solving failed.
pub get failed (1; So, because examplecode depends on path_provider ^0.4.1, version solving failed.)

这是我的包裹

name: examplecode
description: A new Flutter application.

# The following line prevents the package from being accidentally published to
# pub.dev using `pub publish`. This is preferred for private packages.
publish_to: 'none' # Remove this line if you wish …