Check image is loaded in Image.network widget in flutter

Check image is loaded in Image.network widget in flutter

To check whether an image is loaded in a Flutter Image.network widget, you can use a combination of Image.network with ImageStreamListener. Here's how you can do it:

import 'package:flutter/material.dart'; class MyImageWidget extends StatefulWidget { final String imageUrl; MyImageWidget({Key key, this.imageUrl}) : super(key: key); @override _MyImageWidgetState createState() => _MyImageWidgetState(); } class _MyImageWidgetState extends State<MyImageWidget> { bool _isImageLoaded = false; @override Widget build(BuildContext context) { return Column( children: [ Image.network( widget.imageUrl, loadingBuilder: (context, child, loadingProgress) { if (loadingProgress == null) { _isImageLoaded = true; // Image is fully loaded return child; } else if (loadingProgress.cumulativeBytesLoaded != loadingProgress.expectedTotalBytes) { // Image is still loading return CircularProgressIndicator(); } else { // Image failed to load return Text('Failed to load image'); } }, ), SizedBox(height: 10), _isImageLoaded ? Text('Image is loaded') : Text('Image is still loading...'), ], ); } }

In this code:

  • _isImageLoaded is a boolean variable that tracks whether the image is fully loaded.
  • Inside Image.network, we use the loadingBuilder property to show different widgets based on the loading progress.
  • If loadingProgress is null, it means the image is fully loaded, so we set _isImageLoaded to true.
  • We display a CircularProgressIndicator while the image is still loading.
  • If the image fails to load, we display an error message.
  • Below the Image.network, we display a text widget based on the value of _isImageLoaded, indicating whether the image is loaded or still loading.

You can use MyImageWidget in your UI and pass the URL of the image to be loaded. This widget will show a loading indicator while the image is loading and display a message when the image is fully loaded or if it fails to load.

Examples

  1. How to check if an image is successfully loaded in Flutter Image.network widget? Description: Learn how to determine whether an image loaded via the Image.network widget in Flutter has been successfully loaded or not. Code:

    Image.network( 'https://example.com/image.jpg', loadingBuilder: (BuildContext context, Widget child, ImageChunkEvent? loadingProgress) { if (loadingProgress == null) { // Image loaded successfully return child; } else { // Image is still loading return CircularProgressIndicator(); } }, )

  2. Flutter check if Image.network is loaded or failed Description: Implement a mechanism in Flutter to check if an image loaded via the Image.network widget has been successfully loaded or failed to load. Code:

    bool _imageLoaded = false; Image.network( 'https://example.com/image.jpg', loadingBuilder: (BuildContext context, Widget child, ImageChunkEvent? loadingProgress) { if (loadingProgress == null && !_imageLoaded) { // Image loaded successfully _imageLoaded = true; } else if (loadingProgress != null && !_imageLoaded) { // Image failed to load _imageLoaded = false; } return child; }, )

  3. Check if Image.network widget is fully loaded in Flutter Description: Verify if the Image.network widget in Flutter has fully loaded the image content or if it's still loading. Code:

    bool _imageLoaded = false; Image.network( 'https://example.com/image.jpg', loadingBuilder: (BuildContext context, Widget child, ImageChunkEvent? loadingProgress) { if (loadingProgress == null) { // Image loaded successfully _imageLoaded = true; } return child; }, )

  4. Flutter: Check if Image.network is loaded Description: Check the loaded status of an image in Flutter's Image.network widget to handle loading states accordingly. Code:

    bool _imageLoaded = false; Image.network( 'https://example.com/image.jpg', loadingBuilder: (BuildContext context, Widget child, ImageChunkEvent? loadingProgress) { if (loadingProgress == null) { // Image loaded successfully _imageLoaded = true; } return child; }, )

  5. Flutter: Detect if Image.network widget is loaded or not Description: Detect the loading status of an image in Flutter's Image.network widget to manage loading states dynamically. Code:

    bool _imageLoaded = false; Image.network( 'https://example.com/image.jpg', loadingBuilder: (BuildContext context, Widget child, ImageChunkEvent? loadingProgress) { if (loadingProgress == null) { // Image loaded successfully _imageLoaded = true; } return child; }, )

  6. Check if Image.network is loaded in Flutter and handle loading states Description: Check if an image loaded via the Image.network widget in Flutter is fully loaded and handle loading states accordingly. Code:

    bool _imageLoaded = false; Image.network( 'https://example.com/image.jpg', loadingBuilder: (BuildContext context, Widget child, ImageChunkEvent? loadingProgress) { if (loadingProgress == null) { // Image loaded successfully _imageLoaded = true; } return child; }, )

  7. How to know when Image.network has loaded the image in Flutter? Description: Determine when an image loaded via the Image.network widget in Flutter has finished loading to perform subsequent actions. Code:

    bool _imageLoaded = false; Image.network( 'https://example.com/image.jpg', loadingBuilder: (BuildContext context, Widget child, ImageChunkEvent? loadingProgress) { if (loadingProgress == null) { // Image loaded successfully _imageLoaded = true; } return child; }, )

  8. Flutter Image.network loaded state check Description: Check the loaded state of an image in Flutter's Image.network widget to update UI elements accordingly. Code:

    bool _imageLoaded = false; Image.network( 'https://example.com/image.jpg', loadingBuilder: (BuildContext context, Widget child, ImageChunkEvent? loadingProgress) { if (loadingProgress == null) { // Image loaded successfully _imageLoaded = true; } return child; }, )

  9. Flutter Image.network widget loaded status Description: Retrieve the loaded status of an image in Flutter's Image.network widget to handle UI updates based on loading states. Code:

    bool _imageLoaded = false; Image.network( 'https://example.com/image.jpg', loadingBuilder: (BuildContext context, Widget child, ImageChunkEvent? loadingProgress) { if (loadingProgress == null) { // Image loaded successfully _imageLoaded = true; } return child; }, )

  10. How to check if Image.network widget has loaded image content in Flutter? Description: Learn how to check if the Image.network widget in Flutter has finished loading image content to manage loading states effectively. Code:

    bool _imageLoaded = false; Image.network( 'https://example.com/image.jpg', loadingBuilder: (BuildContext context, Widget child, ImageChunkEvent? loadingProgress) { if (loadingProgress == null) { // Image loaded successfully _imageLoaded = true; } return child; }, )

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