square/picasso
Picasso
Picasso is an Android image loading library designed for downloading, caching, and displaying images in applications. It provides an automated system for memory and disk management to reduce network requests and improve load times.
The library includes a bitmap transformation tool for resizing, cropping, and modifying assets before they are rendered. It also functions as a bridge for Jetpack Compose, converting image requests into painter objects for use within declarative Android user interfaces.
The system manages image retrieval from multiple sources, including web URLs, local files, and system assets. It handles placeholder and fallback visuals, implements a two-tier cache hierarchy, and optimizes network traffic by automatically cancelling requests when views are recycled.
Diagnostic tools are available to visualize image provenance, allowing developers to identify whether assets originated from the network, disk, or memory.
Features
- Android Image Loading - Provides a comprehensive system for fetching, caching, and displaying images on Android.
- Network Image Caching - Downloads remote images and stores them locally to minimize redundant network traffic.
- Disk Caching Systems - Maintains images in tiered memory and disk caches for fast retrieval and reduced network usage.
- Android Media Caching - Implements specialized memory and disk caching optimized for Android media assets.
- Tiered Caching Systems - Implements a two-tier hierarchy using fast memory caches and persistent disk storage.
- Dimension Resizing - Adjusts image sizes and shapes to fit layout constraints and minimize memory consumption.
- Image Transformation Utilities - Provides utilities for resizing, rotating, and cropping images before they are rendered in the UI.
- Android Image Loading Libraries - Provides a dedicated library for downloading, caching, and displaying images in Android applications.
- LRU Cache Eviction - Automatically evicts least recently used bitmaps from memory to prevent out-of-memory crashes.
- Bitmap Transformation Pipelines - Provides a pipeline for resizing, cropping, and applying custom visual filters to bitmaps before they are displayed.
- Bitmap Transformation Tools - Provides tools for resizing, cropping, and modifying image assets before they are rendered in a view.
- Remote Processing Offloading - Modifies request parameters to offload image processing to a remote server to reduce local device load.
- Image Asset Constraints - Handles image placeholders, resizing, and cropping to ensure assets fit Android layout constraints.
- Request Cancellations - Automatically terminates active network requests when views are recycled to free up system resources.
- View-Recycling Cancellations - Automatically cancels pending network requests when target views are recycled to save bandwidth.
- Network Traffic Optimization - Optimizes network traffic by managing request lifecycles and cancelling unnecessary downloads in scrolling lists.
- Request Lifecycle Management - Implements mechanisms to prioritize, pause, or cancel image loading tasks to optimize resource usage.
- Jetpack Compose Image Integration - Converts network image requests into compatible painter objects for use within declarative Jetpack Compose interfaces.
- Remote Image Loaders - Acts as a remote image loader that integrates with declarative Android UI via painter objects.
- Request Pipelines - Processes image loading through a sequential pipeline from request creation to rendering.
- Android Libraries - Image downloading and caching library.
- Image Display and Processing - Image caching and loading library.
- Image Loading - Powerful image downloading and caching library.
- Image Processing - Powerful image downloading and caching library.
- ProGuard Configurations - Provides image loading configuration rules.
- Image Loading and Caching - Simplifies image downloading and caching with a fluent API.
Star history
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