app_image 1.0.14

A complete package for developers looking to implement advanced image display features in their Flutter applications with minimal effort.

App Image

app_image is a powerful Flutter package that simplifies image handling with a single, highly customizable widget. It automatically detects and handles all image sources (network, assets, files, memory) and formats (PNG, JPG, SVG) without switching widgets or providers. Features include smooth fade-in animations, customizable placeholders and error widgets, built-in full-screen gallery viewer with swipe navigation, seamless SVG support, and intelligent pre-caching for optimal performance.

Why App Image?

When building Flutter apps, handling images from different sources (network, assets, files, SVG) often requires boilerplate code, manual error handling, and separate implementations for each source type. App Image solves these common pain points:

Problems This Package Solves

• Repetitive Boilerplate: No more writing the same placeholder/error handling logic for every image
• Source Type Switching: Automatically detects and handles different image sources (network, asset, file, memory, SVG) without changing your code
• Poor Loading Experience: Provides smooth fade-in animations and customizable placeholders out of the box
• No Gallery View: Built-in full-screen viewer with swipe navigation for image galleries
• SVG Complexity: Seamlessly handles SVG images alongside raster formats without conditional logic
• Performance Issues: Includes pre-caching capabilities to improve load times

App Image vs Standard Flutter Widgets

Feature	App Image	Standard Image Widget
Auto-detect image source	✅ Yes	❌ Manual provider selection
Built-in placeholder	✅ Customizable	❌ Requires FadeInImage or manual setup
Built-in error widget	✅ Customizable	❌ Manual ErrorBuilder
Fade-in animation	✅ Built-in	❌ Requires FadeInImage
SVG support	✅ Automatic	❌ Separate package & widget
Full-screen viewer	✅ Built-in	❌ Custom implementation needed
Gallery navigation	✅ Swipe between images	❌ Build from scratch
Pre-caching	✅ Built-in	✅ Available but manual setup
Single API for all sources	✅ One widget	❌ Different widgets/providers

Features

• Fade-in Animations: Apply smooth fade-in effects with customizable durations and curves to enhance the visual experience.
• Placeholder and Error Widgets: Display custom placeholder and error widgets while the image loads or if an error occurs.
• Full-Screen Image Viewer: Enable full-screen viewing of images with a simple tap gesture.
• SVG Support: Seamlessly handle SVG images from network, asset, and file sources.
• Pre-caching: Pre-cache images to improve loading performance and provide a smoother user experience.
• Automatic Image Provider Selection: Automatically determine the appropriate image provider based on the image source, with the option to define the ImgProvider explicitly if needed.

Installation

Add the following to your pubspec.yaml file:

dependencies:
  app_image: any  # Replace with the latest version

Then run flutter pub get to install the package.

Usage

Basic Usage

The simplest way to display an image from any source:

import 'package:app_image/app_image.dart';
import 'package:flutter/material.dart';

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Center(
          child: AppImage(
            image: 'https://example.com/image.jpg',
          ),
        ),
      ),
    );
  }
}

Real-World Use Cases

1. E-commerce Product Gallery

Display product images with smooth loading and full-screen gallery view:

AppImage(
  image: product.imageUrl,
  allImages: product.allImageUrls, // Swipe through all product images on fullscreen view
  enableFullScreenView: true, // Enable fullscreen view on tap
  width: 200,
  height: 200,
  placeHolderWidget: CircularProgressIndicator(),
  errorWidget: Icon(Icons.shopping_bag, size: 50),
)

2. Social Media Profile Picture

Handle user avatars with circular shape and fallback:

AppImage(
  image: user.avatarUrl ?? 'assets/default_avatar.png',
  width: 50,
  height: 50,
  borderRadius: BorderRadius.circular(100),
  placeHolderWidget: CircularProgressIndicator(strokeWidth: 2),
  errorWidget: Icon(Icons.person, size: 30),
)

3. Chat Media with Full-Screen Preview

Display chat images with tap-to-expand functionality:

AppImage(
  image: message.imageUrl,
  enableFullScreenView: true,
  width: 250,
  height: 250,
  borderRadius: BorderRadius.circular(12),
  placeHolderWidget: CircularProgressIndicator(),
)

4. One Widget, All Image Sources

The same AppImage widget automatically handles any image source - no need to switch between different widgets or providers:

// Network images - Auto-detected
AppImage(image: 'https://api.com/photo.jpg')

// Network SVG - Auto-detected
AppImage(image: 'https://example.com/icon.svg')

// Asset images - Auto-detected
AppImage(image: 'assets/banner.png')

// Asset SVG - Auto-detected
AppImage(image: 'assets/logo.svg')

// File paths - Auto-detected
AppImage(image: File('/path/to/image.jpg').path)

// File SVG - Auto-detected
AppImage(image: File('/path/to/logo.svg').path)

// Memory/Uint8List - Auto-detected
AppImage(image: uint8List)

No conditional logic needed! Just pass the image source and AppImage automatically:

• Detects the source type (network, asset, file, memory)
• Determines if it's SVG or raster format
• Selects the appropriate image provider
• Handles loading, errors, and animations consistently

Need more control? You can manually specify the provider:

// Explicitly set the image provider type
AppImage(
  image: 'https://api.com/photo.jpg',
  imgProvider: ImgProvider.networkImage, // Manual override
)

// Available providers:
// - ImgProvider.networkImage
// - ImgProvider.assetImage
// - ImgProvider.fileImage
// - ImgProvider.memoryImage
// - ImgProvider.networkImageSvg
// - ImgProvider.assetImageSvg
// - ImgProvider.fileImageSvg

Full Example

Check out the example directory for a complete sample app demonstrating the use of the app_image package.

License

This project is licensed under the MIT License - see the LICENSE file for details.