problem when wanting to return a null listtitle using

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• Undismissible dialog in Flutter

  What I want to achieve is to make dialog that's impossible to dismiss by clicking back button in android.

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  void main() {
    runApp(MyApp());
  }
  
  class MyApp extends StatelessWidget {
    // This widget is the root of your application.
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    Widget build(BuildContext context) {
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        theme: ThemeData(
          primarySwatch: Colors.blue,
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      );
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  class MyHomePage extends StatefulWidget {
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  class _MyHomePageState extends State<MyHomePage> {
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    }
  
    @override
    Widget build(BuildContext context) {
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          return false;
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        child: Scaffold(
          appBar: AppBar(
            title: Text(widget.title),
          ),
          body: Center(
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              setIsLocationWarningActive: (value) {
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                  _isLocationWarningActive = value;
                });
              },
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: <Widget>[
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                  Text(
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                    style: Theme.of(context).textTheme.headline4,
                  ),
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              ),
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          floatingActionButton: FloatingActionButton(
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            tooltip: 'Increment',
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        ),
      );
    }
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  class LocationChecker extends StatefulWidget {
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    final Function(bool) setIsLocationWarningActive;
    final Widget child;
  
    const LocationChecker({Key key, this.setIsLocationWarningActive, this.isLocationWarningActive, this.child}) : super(key: key);
    
    @override
    _LocationCheckerState createState() => _LocationCheckerState();
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  class _LocationCheckerState extends State<LocationChecker> with WidgetsBindingObserver {
    
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      if (await checkLocationPermission) {
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  Future<bool> get checkLocationPermission async {
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• Flutter - Navigator.pushReplacementNamed show the same page

  I have a simple app that has a OnBoarding section and at the end I just want to replace the current screen with the home.

  I have installed this package to avoid to recreate myself the onboarding logic and seems to work well, but can't figured out why at the end when I implement the onDone function it shows me the same screen.

  Here my main.dart

  import 'package:flutter/foundation.dart';
  import 'package:flutter/material.dart';
  import 'package:shared_preferences/shared_preferences.dart';
  import 'package:sizer/sizer.dart';
  
  // Application
  import './theme.dart';
  import './routes.dart';
  import './screens/home/home.dart';
  import './screens/onboarding/onboarding.dart';
  
  void main() async {
    WidgetsFlutterBinding.ensureInitialized();
    SharedPreferences sharedPreferences = await SharedPreferences.getInstance();
  
    bool shoudShowOnboardingPage =
        sharedPreferences.getBool('shoudShowOnboardingPage') ?? true;
  
    runApp(
      MyApp(
        shouldShowOnBoardingScreen: shoudShowOnboardingPage,
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  class MyApp extends StatelessWidget {
    final bool shouldShowOnBoardingScreen;
  
    MyApp({
      this.shouldShowOnBoardingScreen,
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    @override
    Widget build(BuildContext context) {
      return LayoutBuilder(builder: (context, constraints) {
        return OrientationBuilder(
          builder: (context, orientation) {
            SizerUtil().init(constraints, orientation);
            return MaterialApp(
              debugShowCheckedModeBanner: false,
              title: 'My app',
              theme: themeData,
              home: shouldShowOnBoardingScreen
                  ? OnBoardingScreen()
                  : HomePageScreen(),
              onGenerateRoute: RouteGenerator.generateRoute,
            );
          },
        );
      });
    }
  }
  

  Here my routes.dart

  import 'package:flutter/cupertino.dart';
  import 'package:flutter/material.dart';
  
  // Application
  import './screens/home/home.dart';
  import './screens/onboarding/onboarding.dart';
  
  class RouteGenerator {
    static const String homePage = '/';
    static const String onBoardingPage = '/onboarding';
  
    RouteGenerator._();
  
    static Route<dynamic> generateRoute(RouteSettings settings) {
      switch (settings.name) {
        case homePage:
          return MaterialPageRoute(
            builder: (_) => HomePageScreen(),
          );
  
        case onBoardingPage:
          return MaterialPageRoute(
            builder: (_) => OnBoardingScreen(),
          );
  
  
        default:
          throw FormatException('Route not found');
      }
    }
  }
  

  My onBoarding (the repository just define title, body and image for the pages):

  import 'package:flutter/material.dart';
  import 'package:flutter_svg/svg.dart';
  import 'package:introduction_screen/introduction_screen.dart';
  import 'package:shared_preferences/shared_preferences.dart';
  import 'package:sizer/sizer.dart';
  
  // Application
  import '../../repositories/onboarding/onboarding_repository.dart';
  import '../../models/onboarding/onboarding_page.dart';
  import '../../routes.dart';
  
  class OnBoardingScreen extends StatelessWidget {
    final Future<SharedPreferences> _prefs = SharedPreferences.getInstance();
  
    @override
    Widget build(BuildContext context) {
      OnBoardingRepository onBoardingRepository = OnBoardingRepository();
  
      return Scaffold(
        body: IntroductionScreen(
          globalBackgroundColor: Colors.black,
          pages: List.generate(
            onBoardingRepository.pages.length,
            (index) =>
                buildPageViewModel(onBoardingRepository.pages[index], context),
          ),
          showSkipButton: true,
          skip: Text(
            'Salta',
            style: TextStyle(
              color: Colors.white,
            ),
          ),
          next: const Icon(
            Icons.arrow_forward,
            color: Colors.white,
          ),
          done: Container(
            padding: const EdgeInsets.symmetric(
              horizontal: 20,
              vertical: 6,
            ),
            decoration: BoxDecoration(
              color: Theme.of(context).primaryColor,
              border: Border.all(
                color: Theme.of(context).primaryColor,
              ),
              borderRadius: BorderRadius.all(
                Radius.circular(20),
              ),
            ),
            child: Text(
              'Fine',
              style: TextStyle(
                color: Colors.white,
              ),
            ),
          ),
          onDone: () async {
            final SharedPreferences sharedPreferences = await _prefs;
            sharedPreferences.setBool('shoudShowOnboardingPage', false).then((_) {
              Navigator.of(context).pushReplacementNamed(RouteGenerator.homePage);
            });
          },
          dotsDecorator: DotsDecorator(
            activeColor: Theme.of(context).primaryColor,
            size: const Size.square(10.0),
            activeSize: const Size(20.0, 10.0),
            color: Colors.white,
            spacing: const EdgeInsets.symmetric(horizontal: 3.0),
            activeShape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(25.0),
            ),
          ),
        ),
      );
    }
  
    PageViewModel buildPageViewModel(
        OnBoardingPage onBoardingPage, BuildContext context) {
      return PageViewModel(
        title: onBoardingPage.title,
        body: onBoardingPage.body,
        image: Padding(
          padding: EdgeInsets.only(top: 10.0.h),
          child: Center(
            child: SvgPicture.asset(
              onBoardingPage.image,
              height: 60.0.w,
            ),
          ),
        ),
        decoration: PageDecoration(
          titleTextStyle: TextStyle(
            fontSize: 16.0.sp,
            fontWeight: FontWeight.w700,
            color: Theme.of(context).primaryColor,
          ),
          bodyTextStyle: TextStyle(fontSize: 13.0.sp, color: Colors.white),
        ),
      );
    }
  }
  

  And here the home.dart

  import 'package:flutter/material.dart';
  
  class HomePageScreen extends StatelessWidget {
    @override
    Widget build(BuildContext context) {
      return Scaffold(
        body: Center(
          child: Text('hello'),
        ),
      );
    }
  }
  

  The onboarding section works well, I can see the pages, navigate them. The problem is when I press the done button and invoke the onDone function it shows again and again the onboarding screen from the beginning.
  What I expect is to remove the onBoarding screen and replace it with the home just after I set the boolean value for my shoudShowOnboardingPage setting.

  Here the piece of code that do not work as I expect:

  onDone: () async {
          final SharedPreferences sharedPreferences = await _prefs;
          sharedPreferences.setBool('shoudShowOnboardingPage', false).then((_) {
          Navigator.of(context).pushReplacementNamed(RouteGenerator.homePage);
     });
  },
  

  What am I missing?
• Time limit Exceeded in if-else

  Following is a function which change the value of array according to conditions : 1.If the difference between the array element and the next multiple of 5 is less than 3, round up to the next multiple of 5. 2 If the value of array element is less than 38, no rounding occurs. Code :

  vector gradingStudents(vector grades) {

  int n = grades.size();
  int i = 0;
  
  while(i<n)
  {
      if(grades.at(i)<38) 
      {
          i++;
      }
      else if( (grades.at(i)+1) % 5==0 ) 
      {
         grades.at(i) += 1;
         i++;
      }
      else if( (grades.at(i)+2) % 5 == 0) 
      {
          grades.at(i) += 2 ;
          i++;
      }
  }
  
  return grades;
  

  }

  Hackerrank site saying " Time Limit Exceeded". I dont understand how can time limit exceeded when there is no loop (except the essential while loop). If I remove i++ from each if statement and put it outside all if statements then its working fine, but the no. of statements remain same. please help me out
• How to chain several if conditions in php without error?

  I know how to chain several if's in php in a row. I'm asking you because I have a mistake and I can't figure out where it comes from. I have a PHP code that allows me to query an API and retrieve a decoded PDF document depending on the user's country.

  It's almost 3 times the same block but depending on the client's country the PDF changes.

  • When I test the code blocks individually I have no errors.
  • When I put two in a row it works fine, but if I add the third block "elseif", although in my form I choose "United States" the code never executes and I don't understand why. If I execute this third if only the code works well.

  I put the braces to delimit my 3 blocks, so I don't know where it can come from... if someone can help me to know why the 3rd elseif never executes despite the condition being true ?

  <?php
  
  if ($_POST['adresse'][5] == "France"){ 
      $PAYS = $_POST['adresse'][5]; 
      $PAYS = "FR"; 
  } elseif ($_POST['adresse'][5] == "Allemagne"){ 
      $PAYS = $_POST['adresse'][5]; 
      $PAYS = "DE"; 
  } elseif ($_POST['adresse'][5] == "Suisse"){ 
      $PAYS = $_POST['adresse'][5]; 
      $PAYS = "CH";
  } elseif ($_POST['adresse'][5] == "United States"){ 
      $PAYS = $_POST['adresse'][5]; 
      $PAYS = "US"; 
  }
  
  if ( $PAYS == 'FR') //first if
  {
      
      // the soap operation which is called
      $action = 'euExpressRateBook_providerServices_ShipmentHandlingServices_Binder_createShipmentRequest';
  // the xml input of the service
      $xmlrequest = '<?xml version="1.0" encoding="ISO-8859-1"?>
      <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
          ....................
              </ShipmentRequest>
          </soapenv:Body>
      </soapenv:Envelope>';
  
      try {
          $options = array();
          $options['wrapper'] = array(
              
              'soap_version' => 'SOAP_1_1',
              'encoding' => 'UTF-8',
              'user_agent' => 'PHPSoapClient',
              // The exceptions option is a boolean value defining whether soap errors throw exceptions of type SoapFault.
              'exceptions' => true,
              // The trace option enables tracing of request so faults can be backtraced.
              'trace' => true
              );
      
          $context = stream_context_create($options);
          // create the soapclient and invoke __doRequest method
          //WSDL URL is called on init
          $client = new \SoapClient($wsdlUrl, $options);
          //Here we call REQUEST URL
          $output = $client->__doRequest($xmlrequest, $requestUrl, $action, 1);
      } catch (SoapFault $fault) {
          var_dump($fault);
          echo "<h2>SOAP Fault!</h2><p>";
          echo "FaultCode: {$fault->faultcode} <br/>";
          echo "FaultString: {$fault->faultstring} <br/>";
          echo("</p/>");
      }
  
  
      if (is_soap_fault($output)) {
          echo "<h2>SOAP Fault!</h2><p>";
          echo "FaultCode: {$output->faultcode} <br/>";
          echo "FaultString: {$output->faultstring} <br/>";
      } else {
      
          function multiSplit($string)
          {
              $output = array();
              $cols = explode("<GraphicImage>", $string);
  
              foreach ($cols as $col) {
                  $dashcols = explode("</GraphicImage>", $col);
                  $output[] = $dashcols[0];
              }
              return $output;
          }
  
          $DHL = multiSplit($output);
  
          $filename1 = uniqid(rand(), true) . '.txt';
          $filename2 = uniqid(rand(), true) . '.pdf';
  
          $file1 = "C:/wamp64/www/Dylan/SAV/API_label/TXT/$filename1";                       
          file_put_contents($file1, print_r($DHL[1], true) . PHP_EOL, FILE_APPEND | LOCK_EX);
     
          $pdf_base64 = $file1;
          //Get File content from txt file
          $pdf_base64_handler = fopen($pdf_base64,'r');
          $pdf_content = fread ($pdf_base64_handler,filesize($pdf_base64));
          fclose ($pdf_base64_handler);
          //Decode pdf content
          $pdf_decoded = base64_decode ($pdf_content);
          //Write data back to pdf file
          $pdf = fopen ("C:/wamp64/www/Dylan/SAV/API_label/PDF/$filename2",'w');
          fwrite ($pdf,$pdf_decoded);
          //close output file
          fclose ($pdf);
          // echo 'Done';
      }
  } elseif ( $PAYS == 'DE' || 'BE') //Second if
  {
  
      // the soap operation which is called
      $action = 'euExpressRateBook_providerServices_ShipmentHandlingServices_Binder_createShipmentRequest';
      // the xml input of the service
      $xmlrequest = '<?xml version="1.0" encoding="ISO-8859-1"?>
      <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
      <soapenv:Header>
      <wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" soapenv:mustUnderstand="1">
      <wsse:UsernameToken xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" wsu:Id="UsernameToken-5">
      <wsse:Username>'.$LOGIN.'</wsse:Username>
      <wsse:Password Type="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordText">'.$PASSWORD.'</wsse:Password>
      </wsse:UsernameToken>
      </wsse:Security>
      </soapenv:Header>
         <soapenv:Body>
            <ShipmentRequest xmlns="http://scxgxtt.phx-dc.dhl.com/euExpressRateBook/ShipmentMsgRequest">
              ................
               </RequestedShipment>
            </ShipmentRequest>
         </soapenv:Body>
      </soapenv:Envelope>';
  
      try {
          $options = array();
          $options['wrapper'] = array(
              
              'soap_version' => 'SOAP_1_1',
              'encoding' => 'UTF-8',
              'user_agent' => 'PHPSoapClient',
              
              // The exceptions option is a boolean value defining whether soap errors throw exceptions of type SoapFault.
              'exceptions' => true,
              
              // The trace option enables tracing of request so faults can be backtraced.
              'trace' => true
          );
          
          $context = stream_context_create($options);
          // create the soapclient and invoke __doRequest method
          //WSDL URL is called on init
          $client = new \SoapClient($wsdlUrl, $options);
          //Here we call REQUEST URL
          $output = $client->__doRequest($xmlrequest, $requestUrl, $action, 1);
      } catch (SoapFault $fault) {
          var_dump($fault);
          echo "<h2>SOAP Fault!</h2><p>";
          echo "FaultCode: {$fault->faultcode} <br/>";
          echo "FaultString: {$fault->faultstring} <br/>";
          echo("</p/>");
      }
  
  
      if (is_soap_fault($output)) {
          echo "<h2>SOAP Fault!</h2><p>";
          echo "FaultCode: {$output->faultcode} <br/>";
          echo "FaultString: {$output->faultstring} <br/>";
      } else {
   
          function multiSplit($string)
          {
              $output = array();
              $cols = explode("<GraphicImage>", $string);
      
              foreach ($cols as $col)
              {
                  $dashcols = explode("</GraphicImage>", $col);
                  $output[] = $dashcols[0];
              }
              
              return $output;
          }
       
          $DHL = multiSplit($output);
  
         $filename1 = uniqid(rand(), true) . '.txt';
         $filename2 = uniqid(rand(), true) . '.pdf';
      
         $file1 = "C:/wamp64/www/Dylan/SAV/API_label/TXT/$filename1";                       
         file_put_contents($file1, print_r($DHL[1], true) . PHP_EOL, FILE_APPEND | LOCK_EX);
         
          $pdf_base64 = $file1;
          //Get File content from txt file
          $pdf_base64_handler = fopen($pdf_base64,'r');
          $pdf_content = fread ($pdf_base64_handler,filesize($pdf_base64));
          fclose ($pdf_base64_handler);
          //Decode pdf content
          $pdf_decoded = base64_decode ($pdf_content);
          //Write data back to pdf file
          $pdf = fopen ("C:/wamp64/www/Dylan/SAV/API_label/PDF/$filename2",'w');
          fwrite ($pdf,$pdf_decoded);
          //close output file
          fclose ($pdf);
          // echo 'Done';
      }
  } elseif ( $PAYS  == 'US' || 'GB'|| 'NO'|| 'CH') //Third if
  {
  
      $xmlrequest = '<?xml version="1.0" encoding="ISO-8859-1"?>
      <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
      </soapenv:Header>
      ...............................
         </ShipmentRequest>
      </soapenv:Body>
      </soapenv:Envelope>';
      
      try {
       $options = array();
       $options['wrapper'] = array(
           
           'soap_version' => 'SOAP_1_1',
           'encoding' => 'UTF-8',
           'user_agent' => 'PHPSoapClient',
           
           // The exceptions option is a boolean value defining whether soap errors throw exceptions of type SoapFault.
           'exceptions' => true,
           
           // The trace option enables tracing of request so faults can be backtraced.
           'trace' => true
       );
       
       $context = stream_context_create($options);
       // create the soapclient and invoke __doRequest method
       //WSDL URL is called on init
       $client = new \SoapClient($wsdlUrl, $options);
       //Here we call REQUEST URL
       $output = $client->__doRequest($xmlrequest, $requestUrl, $action, 1);
      }
      catch (SoapFault $fault) {
          var_dump($fault);
          echo "<h2>SOAP Fault!</h2><p>";
          echo "FaultCode: {$fault->faultcode} <br/>";
          echo "FaultString: {$fault->faultstring} <br/>";
          echo("</p/>");
      }
      
      
      if (is_soap_fault($output)) {
          echo "<h2>SOAP Fault!</h2><p>";
          echo "FaultCode: {$output->faultcode} <br/>";
          echo "FaultString: {$output->faultstring} <br/>";
      }
      else {
        
      
       function multiSplit($string)
           {
               $output = array();
               $cols = explode("<GraphicImage>", $string);
      
           foreach ($cols as $col)
           {
               $dashcols = explode("</GraphicImage>", $col);
               $output[] = $dashcols[0];
           }
           
           return $output;
        }
      
      
        function multiSplit2($string)
           {
               $output = array();
               $cols = explode("<DocumentImage>", $string);
      
           foreach ($cols as $col)
           {
               $dashcols = explode("</DocumentImage>", $col);
               $output[] = $dashcols[0];
           }
           
           return $output;
        }
        
      $DHL = multiSplit($output);
      $DHL2 = multiSplit2($output);
      
      $filename1 = uniqid(rand(), true) . '.txt';
      $filename2 = uniqid(rand(), true) . '.pdf';
      
      $filename3 = uniqid(rand(), true) . '.txt';
      $filename4 = uniqid(rand(), true) . '.pdf';
      
      $file1 = "C:/wamp64/www/Dylan/SAV/API_label/TXT/$filename1";                       
      file_put_contents($file1, print_r($DHL[1], true) . PHP_EOL, FILE_APPEND | LOCK_EX);
       $file2 = "C:/wamp64/www/Dylan/SAV/API_label/TXT/$filename3";                       
       file_put_contents($file2, print_r($DHL2[1], true) . PHP_EOL, FILE_APPEND | LOCK_EX);
      
       $pdf_base64 = $file1;
       //Get File content from txt file
       $pdf_base64_handler = fopen($pdf_base64,'r');
       $pdf_content = fread ($pdf_base64_handler,filesize($pdf_base64));
       fclose ($pdf_base64_handler);
       //Decode pdf content
       $pdf_decoded = base64_decode ($pdf_content);
       //Write data back to pdf file
       $pdf = fopen ("C:/wamp64/www/Dylan/SAV/API_label/PDF/$filename2",'w');
       fwrite ($pdf,$pdf_decoded);
       //close output file
       fclose ($pdf);
      //  echo 'Done';
      
      
       $pdf_base642 = $file2;
       //Get File content from txt file
       $pdf_base64_handler = fopen($pdf_base642,'r');
       $pdf_content = fread ($pdf_base64_handler,filesize($pdf_base642));
       fclose ($pdf_base64_handler);
       //Decode pdf content
       $pdf_decoded = base64_decode ($pdf_content);
       //Write data back to pdf file
       $pdf2 = fopen ("C:/wamp64/www/Dylan/SAV/API_label/Commercial invoice/$filename4",'w');
       fwrite ($pdf2,$pdf_decoded);
       //close output file
       fclose ($pdf2);
      
       }
  }
  
  
  ?>
  
• JS: Test elements existence and tag name as a one liner

  I am trying to find the correct a-tag within a DOM. For this I need to parse its direct neighbors:

  let strongTags = document.querySelectorAll('div.entry p strong');
  for (let i = 0; i < strongTags.length; i++) {
      if (strongTags[i].textContent.toLowerCase().match("size")) {
          let dbATag;
          if (strongTags[i].nextElementSibling) {
              if (strongTags[i].nextElementSibling.tagName == "A") {
                  dbATag = strongTags[i].nextElementSibling;
              } else if (strongTags[i].nextElementSibling.nextElementSibling) {
                  if (strongTags[i].nextElementSibling.nextElementSibling.tagName == "A") {
                      dbATag = strongTags[i].nextElementSibling.nextElementSibling;
                  }
              }
          }
      }
  }
  

  As you can see, I don't know if the a tag is in nextElementSibling or in the second nextElementSibling. Theoretically there could be a third one, but I never saw it in the data. I'd like something like a querySelector('a') directly from the strongTags[i] position within the current parent. But that's another one of my don't knows.

  My current main problem is that I can't test if strongTags[i].nextElementSibling exists and if tagName is A, like this:

  if (strongTags[i].nextElementSibling && strongTags[i].nextElementSibling.tagName == "A").

  Even though it doesn't exist, the interpreter still tries to test for tagName as well. This results in an error that stops further execution of my script. That's why I split it into two lines for now.

  How can I solve this a bit more beautiful? :)

  EDIT: I have no influence on DOM creation. I do page modification with Tampermonkey.

  And I can not post the page itself. But I can post a part of DOM from the section if it helps:

  <div id="content">
      <div class="post">
          <h1 id="post-1243629">Post-Header</h2>
              <div class="entry">
                  <p></p>
                  <blockquote>
                      <p></p>
                      <p></p>
                  </blockquote>
                  <p><strong>Date: </strong>ddmmyyy / 
                      <strong>Format: </strong>$ / 
                      <strong>Optional strong tag: </strong>Data / 
                      <strong>Size: </strong>MB / 
                      <strong>Db:</strong><a href="">xyz</a>
                      <strong>Optional strong tag: </strong>Data /
                  </p>
                  <p><strong></strong><br />
                      <strong></strong> <a href=""></a><br />
                      <span>
                          <strong></strong> <a href=""></a><br />
                      </span>
                      <span id="">
                          <strong></strong> <a href=""></a><br />
                          <strong></strong> <a href=""></a><br />
                          <strong></strong> <a href=""></a><br />
                      </span>
                      <strong></strong>
                  </p>
              </div>
      </div>
  </div>