cached_memory_image

Package Overview

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CachedMemoryImage is a Flutter package designed to efficiently display images from Base64 strings or Uint8List data while caching them locally. It ensures fast image loading by storing decoded images in the device's cache directory, reducing redundant processing and network requests. Ideal for apps that handle dynamic or frequently accessed images, it supports multiple platforms including Android, iOS, macOS, Windows, and Linux. The library simplifies image management with minimal setup and integrates seamlessly into existing Flutter projects.

Use cases

Displaying base64-encoded images
Caching image data locally
Loading images from Uint8List
Reducing repeated image decoding
Offline image access
Improving app performance

Key features

Supports Base64 and Uint8List inputs
Local caching in device cache directory
Cross-platform compatibility
Automatic image reuse from cache
Minimal configuration required
Efficient memory usage

Suitable for

Apps with dynamic image content
Offline-first applications
High-frequency image rendering
Media-heavy UIs
Developers seeking simple image caching
Projects requiring lightweight image handling

Considerations

Cache size not configurable
No built-in image compression
Relies on system cache directory
Limited control over cache eviction policy
Not optimized for large image datasets
Requires manual cache clearing if needed

Original README

Original README snapshot from the linked source repository. Visit the repository for the latest content.

A Flutter library to show images from the Base64, Uint8List and keep them in the cache directory.

Features

Check file is exists

final cachedImageManager = CachedImageBase64Manager.instance();

await cachedImageManager?.isExists('app://image/1');
await cachedImageManager?.removeFile('app://image/1');

Cached Image from Base64

Widget

CachedMemoryImage(
  uniqueKey: 'app://image/1',
  base64: 'iVBORw0KGgoAAAANSUhEUgAAAk0AAAFwCAYAAACl9k...',
),

Image Provider

CachedMemoryImageProvider(
  'app://image/6',
  base64: 'iVBORw0KGgoAAAANSUhEUgAAAk0AAAFwCAYAAACl9k...',
)

Cached Image from Uint8List

Widget

CachedMemoryImage(
  uniqueKey: 'app://image/1',
  bytes: Uint8List.fromList([1,2,3,4,5]),
)

Image Provider

CachedMemoryImageProvider(
  'app://image/5',
  bytes: Uint8List.fromList([1,2,3,4,5]),
)

Getting started

It is really easy to use! You should ensure that you add the cached_memory_image as a dependency in your flutter project.

cached_memory_image: ^1.5.0

Usage

Cached image from Base64 and Display

Padding(
  padding: const EdgeInsets.all(8.0),
  child: CachedMemoryImage(
    uniqueKey: 'app://image/1',
    base64: 'iVBORw0KGgoAAAANSUhEUgAAAk0AAAFwCAYAAACl9k...',
  ),
)

Cached image from Uint8List and Display

Padding(
  padding: const EdgeInsets.all(8.0),
  child: CachedMemoryImage(
    uniqueKey: 'app://image/1',
    bytes: Uint8List.fromList([1,2,3,4,5]),
  ),
)

How it works

The cached memory images stores and retrieves files using the flutter_cache_manager.

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