Solved: Error: No named parameter with the name ‘displayLarge’
Introduction
Visual content is a crucial element of any web application, and depicting images in various sizes is essential for enhancing the user experience. Google’s Material Design provides a flexible and robust way to handle image sizes using the `MaterialButton` component and the `Image` component. However, when dealing with dynamic images, developers often encounter the error “No named parameter with the name ‘displayLarge’.” In this article, we will delve into the root cause of this error and provide a step-by-step solution to resolve it.
The Root Cause: A Missing Parameter
The error “No named parameter with the name ‘displayLarge'” occurs when the `displayLarge` parameter is not passed to the `showLargeBanner` method. This parameter is crucial for displaying an image in its large size. To understand this error, let’s look at a simple example using Flutter.
Code Example
“`dart
import ‘package:flutter/material.dart’;
import ‘package:example/images_model.dart’;
class ImagesPage extends StatefulWidget {
const ImagesPage({Key? key}) : super(key: key);
@override
State
}
class _ImagesPageState extends State
final Images _images = const Images();
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text(‘Image Error Example’),
),
body: Center(
child: Image.asset(_images.largeImage,
key: const Key(‘image.Large’),
height: MediaQuery.of(context).size.height * 0.5,
),
),
);
}
}
“`
In the above example, we are trying to display an image in its large size using the `Image.asset` widget. However, we are not passing the `displayLarge` parameter to the `Image.asset` widget.
Solution: Passing Required Parameters
To resolve the error, we need to pass the `displayLarge` parameter to the `Image.asset` widget. We can do this by modifying the code as follows:
“`dart
import ‘package:flutter/material.dart’;
import ‘package:example/images_model.dart’;
class ImagesPage extends StatefulWidget {
const ImagesPage({Key? key}) : super(key: key);
@override
State
}
class _ImagesPageState extends State
final Images _images = const Images();
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text(‘Image Error Example’),
),
body: Center(
child: Image.memory(
_images.largeImageBytes, // Replace with your image bytes
displayLarge: true, // Pass displayLarge parameter
isAntiAlias: true,
color: Colors.red, // Colorizing parameter should be applied alongside displayLarge: true
width: MediaQuery.of(context).size.width,
),
),
);
}
}
“`
In the modified code, we are passing the `displayLarge` parameter to the `Image.memory` widget. This parameter is required when you want to display an image in its large size.
Conclusion
In conclusion, the error “No named parameter with the name ‘displayLarge'” occurs when the `displayLarge` parameter is not passed to the `Image.asset` or `Image.memory` widget. By passing this parameter, you can resolve the error and display your image in its large size.
Frequently Asked Questions (FAQs)
Q1: What is the purpose of the `displayLarge` parameter?
A1: The `displayLarge` parameter is used to display an image in its large size. It is a required parameter when you want to display an image without scaling or resizing it.
Q2: What is the difference between `Image.asset` and `Image.memory`?
A2: `Image.asset` and `Image.memory` are two different types of image widgets in Flutter. `Image.asset` is used to display an image from an asset file, while `Image.memory` is used to display an image from a byte array.
Q3: Why do I need to pass the `displayLarge` parameter when displaying images in Flutter?
A3: Passing the `displayLarge` parameter helps ensure that images are displayed in their native size, without scaling or resizing.
Q4: Can I use the `displayLarge` parameter with other image widgets?
A4: Yes, you can use the `displayLarge` parameter with other image widgets in Flutter, such as `Image.network`.
Q5: What are some common errors that can occur when using the `displayLarge` parameter?
A5: Common errors that can occur when using the `displayLarge` parameter include the “No named parameter with the name ‘displayLarge'” error, as well as issues with image scaling or resizing.
Keywords: Flutter, Image.asset, Image.memory, displayLarge parameter, no named parameter error, image size, image display.
