In the article, I will discuss, how to Implement placeholder images in the custom image widget.
For this, I will use FadeInImage widget to handle placeholder images. This FadeInImage widget, displays a placeholder image before requesting an image from the internet.
Check our Flutter app development page.
Let’s start with the implementation part.
Firstly, I create an ImageView widget that accepts the URL and build the FadeInImage widget.
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import 'package:flutter/material.dart'; class ImageView extends StatelessWidget { final String? url; double height; double width; ImageView({Key? key, this.url,this.width = 0.0, this.height = 0.0}) : super(key: key); @override Widget build(BuildContext context) { print(url); return FadeInImage( placeholder: const AssetImage('assets/images/placeholder.png'), image: NetworkImage(url ?? ''), imageErrorBuilder:(context, error, stackTrace) { return Image.asset('assets/images/placeholder.png', width: width != 0.0 ? width : null, height: height != 0.0 ? height : null); }, fit: BoxFit.cover, width: width != 0.0 ? width : null,height: height != 0.0 ? height : null ); } } |
Here i have use 2 extra params that accept image height and width which manage image according to the given size.
You can also use the memoryNetwork to access transparent_image package.This package exports one constant: kTransparentImage which is a simple transparent image. To know more about transparent_image package please click here.
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FadeInImage.memoryNetwork( placeholder: kTransparentImage, image: 'image url', ); |
Now call this imageview widget in code where we want to show image.
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ImageView(url:"image Url String",width:MediaQuery.of(context).size.width,height:MediaQuery.of(context).size.width) |
Here is the output:
Note: Make sure you added the asset to the project’s pubspec.yaml file.
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flutter: assets: + - assets/ |
Reference links:
https://docs.flutter.dev/cookbook/images/fading-in-images
https://pub.dev/packages/transparent_image
In conclusion, I hope this code will help you better to understand implement the placeholder image with custom image widget flutter. If you feel any doubt or query please comment below.
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