Pyozer
Failed assertion: line 31 pos 16: 'dotsCount != null && dotsCount > 0': is not true
Hi,
I am getting error as:
'package:dots_indicator/src/dots_indicator.dart': Failed assertion: line 31 pos 16: 'dotsCount != null && dotsCount > 0': is not true.
In init state part I am getting a data from remote server. Once the data verify I set the loadIndicator true so I can show the page. in area that data verify before setting the page loadIndicator to true in setState I set the pageLength. pageLength is integer and it totals of list of the data that I get from database. Everything works. Even I set the dotsCount = pageLength;
Any idea why I am keep getting this error?
My code:
return Scaffold(
body: new Form(
key: _formKey,
child: Stack(
children: [
Column(
children: [
// IMAGE AREA TOP
Container(
height: 230.0,
width: MediaQuery.of(context).size.width - 50.0,
child: PageView.builder(
scrollDirection: Axis.horizontal,
controller: _pageController,
onPageChanged: ((_page) {
setState(() {
int _currentValue = int.parse('$_page');
currentIndexPage = _currentValue;
});
}),
itemCount: pageLength,
itemBuilder: (context, index) => _creditCard(context, currentIndexPage),
),
),
// DOTS INDICTOR AREA
Padding(
padding: const EdgeInsets.only(top: 16.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
DotsIndicator(
dotsCount: pageLength,
position: double.parse('$currentIndexPage'),
decorator: DotsDecorator(
color: Colors.black38,
activeColor: Colors.red,
size: const Size.square(9.0),
activeSize: const Size(18.0, 9.0),
activeShape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(5.0)),
),
)
],
),
),
flutter doctor -v:
[✓] Flutter (Channel stable, 1.22.6, on macOS 11.2.2 20D80 darwin-x64, locale en-GB)
• Flutter version 1.22.6 at /Users/*********/flutter
• Framework revision 9b2d32b605 (6 weeks ago), 2021-01-22 14:36:39 -0800
• Engine revision 2f0af37152
• Dart version 2.10.5
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
• Android SDK at /Users/*********/Library/Android/sdk
• Platform android-30, build-tools 30.0.3
• ANDROID_HOME = /Users/*********/Library/Android/sdk
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS (Xcode 12.4)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 12.4, Build version 12D4e
• CocoaPods version 1.10.1
[✓] Android Studio (version 4.1)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin installed
• Dart plugin version 201.9335
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)
[✓] IntelliJ IDEA Community Edition (version 2020.3.2)
• IntelliJ at /Applications/IntelliJ IDEA CE.app
• Flutter plugin installed
• Dart plugin version 203.6912
[✓] Connected device (1 available)
• iPhone 11 (mobile) • 92E3**************************************E72 • ios • com.apple.CoreSimulator.SimRuntime.iOS-14-4 (simulator)
dotsCount: popularProducts.popularProductList.length <= 0 ? 1 : popularProducts.popularProductList.length
Hi, the error indicate that you have not set the param dotsCount with a positive value (>= 1). So dotsCount is maybe null or set as 0 or something else.
It's weird, your code seems to be "correct" to avoid having a 0 value, can you provide more code ?
