Android development tools and libraries

This project provides a set of Android Material Design widgets, including floating action buttons and floating action menu components. These elements highlight primary screen actions through customizable sizing, shadow effects, and Jetpack Compose UI components. The library includes a circular progress button that embeds a loading spinner to signal background task processing. Its menu components organize expanding buttons with labels and background dimming to provide quick access to multiple primary application actions.

This is an open-source Android application that serves as a reference implementation for modern app architecture. It demonstrates a modular, testable structure built with Kotlin, Coroutines, and Jetpack libraries, organized into independent feature modules that each follow Clean Architecture and the MVVM pattern. The project enforces coding standards through an automated static analysis pipeline that integrates linting, formatting checks, and code quality tools directly into the build process, failing the build on any violations. It uses reusable Gradle convention plugins to standardize build

This project is a native Android widget toolkit that provides a collection of standardized interface elements for mobile application development. It serves as a comprehensive implementation of the Material Design language, offering ready-to-use widgets and layouts designed to ensure consistent visual and interactive patterns across an application. The library distinguishes itself by integrating directly with the platform view system, allowing developers to maintain a uniform look and feel across different screens. It utilizes a centralized theme object to resolve visual properties and support

CheeseSquare is an Android UI component gallery and reference application. It serves as a practical demonstration of Material Design components and layout patterns implemented on the Android platform. The project showcases the use of standardized library elements, including collapsing toolbars, floating action buttons, and navigation drawers. It provides a live environment for prototyping Android components to ensure design consistency across different device screens. The application focuses on the implementation of Android design guidelines and mobile user experience standardization through

MaterialViewPager is a library that creates a scrollable, swipeable interface with an animated header image, toolbar, and logo following Material Design guidelines. It provides a complete implementation of a Material Design ViewPager, where the header background color and image animate as the user swipes between pages. The library coordinates scroll-driven header animations by synchronising scroll offsets from the ViewPager and attached scrollable views through a central coordinator. It supports fragment-based page composition, allowing each page to have independent content layouts while shar

MaterialDesignLibrary is an Android Material Design UI library and cross-version framework. It provides a collection of pre-built interface controls and a compatibility layer that enables modern design patterns on older Android devices starting from version 2.2. The project focuses on bringing updated design standards to legacy Android versions to ensure a consistent user experience. This is achieved through a compatibility layer that implements modern interface elements without sacrificing visual quality on outdated operating system releases. The library includes a variety of functional com

material-dialogs is a Kotlin UI component library that provides a collection of modal dialogs and bottom sheets for Android applications. It is designed to implement user interface elements that follow Material Design standards. The library provides specialized modal interfaces for selecting calendar dates, clock times, and specific color values. It also includes system chooser integrations for selecting files and directories from local storage. Beyond pickers, the library covers a broader range of interaction components including text input dialogs, modal alerts with action buttons, and bot

android-ktx is a Kotlin extension library for the Android framework. It provides a collection of idiomatic helper functions that wrap native system calls to reduce boilerplate and improve code readability throughout Android application development. The library implements a set of tools for building styled strings, transformation matrices, and graphical elements. It utilizes a builder-based syntax to simplify the construction of system objects such as content values and data bundles. The project covers a broad range of capabilities, including the simplification of view manipulations and time

A library to bring fully animated Material Design components to pre-Lolipop Android.

AndroidX is the official collection of Android Jetpack libraries for building Android applications. It provides a suite of backward-compatible APIs that expose modern platform features on older Android versions, ensuring consistent functionality across devices. The project is built around lifecycle-aware component architecture, with tools like ViewModel for preserving UI data across configuration changes, LiveData for lifecycle-aware data observation, and WorkManager for constraint-based background task scheduling. The project distinguishes itself through compile-time code generation and type

Retrofit is a type-safe HTTP client that simplifies network communication by allowing developers to define API endpoints as interface methods. By using annotation-driven request mapping, it automatically translates these interface definitions into structured HTTP requests, ensuring consistent data structures and reducing manual configuration when interacting with remote web services. The project distinguishes itself through a highly modular architecture that separates network transport from data handling. It utilizes dynamic proxy generation to process method calls at runtime and offers a plu

The Android NDK samples provide a comprehensive collection of code examples demonstrating how to integrate C and C++ native code into Android applications. This repository serves as a practical guide for developers utilizing the Android Native Development Kit to implement performance-critical application components that require direct hardware access and low-level system interaction. The project highlights the use of the Java Native Interface to bridge managed code with native modules, enabling cross-language function calls and efficient data exchange. It demonstrates how to manage native act

Ijkplayer is a cross-platform media playback engine designed to provide consistent audio and video rendering across mobile devices. Built upon established open-source multimedia frameworks, it functions as a unified engine that leverages hardware-accelerated decoding to process diverse media formats. The project distinguishes itself by providing a comprehensive toolchain for compiling and configuring low-level media source code into native binary libraries. This allows developers to integrate high-performance playback directly into mobile applications, utilizing a pluggable output architectur

Acra is an Android crash reporting framework and diagnostic data collector designed to detect failures and capture device diagnostics, system logs, and application state. It serves as an embeddable library for capturing and processing crash reports, providing a pipeline to send this data to custom backends or via email. The project features a plugin-based sender architecture that allows reports to be routed through HTTP endpoints, email clients, or proprietary backend implementations. It includes a user-controlled reporting system with preference toggles and interactive dialogs to manage user

The dependency analysis Gradle plugin is a diagnostic and management tool designed to optimize build configurations for JVM and Android projects. It identifies unused dependencies and plugins by inspecting source code and compiled bytecode, ensuring that project configurations remain lean and efficient. By integrating directly into the build lifecycle, the plugin provides actionable insights that help maintain clean dependency declarations and reduce unnecessary build overhead. The project distinguishes itself through a heuristic-based advice engine that explains the rationale behind every re

OkHttp is an HTTP client for the JVM and Android that enables network communication via synchronous and asynchronous requests. It provides a core identity as a comprehensive networking toolkit featuring a WebSocket client for bidirectional data synchronization, a TLS security toolkit for encrypted communication, and a programmable HTTP mock server for simulating backend responses. The project distinguishes itself through a specialized security and performance architecture. It implements mutual TLS, certificate pinning, and DNS over HTTPS to secure data in transit, while utilizing connection p

Glide is an image loading and caching library for Android that fetches and decodes images, GIFs, and video stills from local or remote sources. It functions as a media rendering framework and memory management tool designed to resize and downsample assets to fit specific view dimensions. The system prioritizes scrolling performance through a multi-level caching strategy that stores decoded media in memory and raw data on disk. It employs resource pooling to reuse bitmap memory and binds image loading tasks to component lifecycles to automatically release resources and prevent memory leaks. T

LeakCanary is a diagnostic tool designed to identify memory leaks by monitoring object lifecycles and analyzing heap snapshots. It automatically detects objects that fail to be garbage collected after their expected lifespan, providing developers with actionable insights to prevent performance degradation and application crashes. The project distinguishes itself by offloading memory-intensive heap parsing to a separate background process, which minimizes performance impact on the main application during runtime. It includes sophisticated deobfuscation capabilities that map obfuscated stack tr

ButterKnife is an Android view binding library and Java annotation processor that automates the linking of UI elements and resources to class fields and methods. It functions as a system for managing view references and event listeners to reduce repetitive setup code in Android applications. The library uses compile-time code generation to replace manual view lookups and type casting with generated helper classes, ensuring a reflection-free runtime. It differentiates itself by providing mechanisms for binding interaction events directly to methods, eliminating the need for anonymous inner cla

EventBus is a publish-subscribe messaging library designed to facilitate decoupled communication between components in Java applications. It functions as a central hub where producers dispatch events that are routed to subscribers based on the class type of the payload. By using annotation-based markers, the system maps event handlers to specific data types, allowing different parts of an application to exchange information without requiring direct references between classes. The library distinguishes itself through a focus on performance and execution control. It utilizes a compile-time inde

iosched is an Android event scheduling application designed for browsing conference sessions, reserving seats, and managing personal event schedules. It serves as a cloud-synced event manager that keeps user preferences and reservations synchronized across devices. The project provides specialized tools for conference navigation, including integrated maps and informational pages to guide attendees through physical venue spaces. It also functions as a real-time notification client that delivers live updates regarding schedule changes and session availability. The application covers broad capa

RxAndroid is a reactive programming library and binding layer that integrates RxJava with the Android runtime environment. It provides a framework for composing asynchronous data streams and managing event-driven workflows specifically tailored for Android's threading requirements. The library functions as an Android thread scheduler, routing reactive operations to the main UI thread or specific Android loopers. This ensures that asynchronous task outcomes are dispatched to the primary interface thread for safe updates of visual components while preventing background processing from blocking

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

Fresco is an Android image loading library and cache manager designed to fetch, decode, and display images from network or local sources. It functions as a rendering engine for animated image formats and a streaming system for progressive image loading. The library distinguishes itself through specialized memory management that utilizes off-heap allocation to reduce garbage collection overhead and prevent out-of-memory errors. It includes a dedicated rendering pipeline for animated GIFs and WebP files and supports progressive JPEG decoding to render low-resolution versions of images while the

Stetho is a debug bridge that connects Android applications to Chrome Developer Tools. It allows for the real-time inspection of network traffic, internal application state, and the user interface layout directly within a desktop browser. The project provides specialized inspectors for analyzing Android-specific components. This includes a network inspector for capturing HTTP requests and responses, an SQLite database browser for querying local storage, and a view hierarchy inspector for mapping UI elements and styles. Additional capabilities cover runtime execution via an embedded JavaScrip

RxBinding is an Android UI binding library that transforms standard view listeners into RxJava observables. It serves as a bridge and reactive wrapper, converting user interactions and widget states into reactive data flows. The project enables the implementation of reactive programming patterns across Android system interactions. By treating UI interactions as data streams, it allows for the asynchronous handling of events to decouple the view layer from business logic. The library covers the conversion of UI events into streams, the management of widget states to trigger application update

This library provides a development framework for managing Bluetooth Low Energy connections and data exchange on Android devices. It functions as both a client manager for executing read and write operations with hardware peripherals and a server framework for configuring local devices to host GATT services. The library distinguishes itself through a managed, queue-based architecture that serializes asynchronous requests to prevent command collisions and ensure reliable transmission. It automates complex tasks such as packet splitting, service discovery, and connection retries, while maintain

This project is a Gradle plugin designed to facilitate aspect-oriented programming within Android applications. It functions as a build-time tool that intercepts method calls to inject cross-cutting logic, allowing developers to centralize concerns such as logging, security, or performance monitoring without modifying individual source files. The plugin distinguishes itself by its ability to perform binary dependency weaving, which applies instrumentation across both local source code and external library formats like JARs and AARs. By utilizing the Gradle Transform API, it integrates directl

This project is a messaging SDK for Android applications, providing the core infrastructure for real-time communication using Kotlin and Jetpack Compose. It offers a suite of modular, declarative UI components and a backend-connected API to manage user authentication, persistent socket connections, and data synchronization. The SDK is distinguished by its offline-first architecture, which utilizes local database persistence to cache conversation history and queue user actions for synchronization once network connectivity is restored. Developers can customize the messaging experience through a

This repository provides a collection of reference implementations and patterns for testing Android applications. It serves as a guide for developers to integrate standard testing libraries and frameworks into their projects, covering the full spectrum of verification from local business logic to complex interface interactions. The project distinguishes itself by demonstrating how to configure and execute tests across diverse environments, including local virtual machines and physical devices or emulators. It provides specific patterns for validating inter-application communication, automatin

uiautomator2 is an Android device automation tool and UI testing library. It functions as a framework for automating user interface interactions and managing device states via a remote client. The project provides a remote management interface for controlling Android applications, simulating user gestures, and managing system settings. It enables the analysis of XML UI hierarchies to locate interface elements and verify application behavior. The tool covers broad capability areas including application lifecycle management, device connectivity, and file system operations. It also includes sys

VirtualAPK is an Android plugin framework and runtime environment designed to load and execute external Android packages dynamically. It functions as a component host that allows a main application to run activities, services, and providers delivered via external modules without requiring system installation or manifest registration. The framework enables dynamic feature delivery by loading external packages at runtime, allowing application functionality to be updated without redeploying the entire app. It provides a mechanism for Android sandbox execution, running isolated components within

Dynamic-load-apk is an Android plugin framework that enables a host application to load and run uninstalled APK files as plugins at runtime. It provides the core infrastructure for loading APKs from storage, launching their activities, and managing their lifecycle without requiring the user to install them through the system package manager. The framework handles the fundamental challenges of running uninstalled code on Android through several key mechanisms. It isolates plugin classes in a separate DexClassLoader to prevent conflicts with the host class hierarchy, merges plugin resources int

Shadow is an Android plugin framework designed to dynamically load and execute Android components and native libraries from external modules into a host application. It functions as a dynamic component loader that integrates activities, services, and broadcast receivers without requiring modifications to the host application code. The system includes a native library loader to execute C/C++ binary files from plugin modules directly within the host process. It also features a module dependency manager that supports segmented loading and explicit dependency chains across multiple plugin package

Detox is a gray-box end-to-end testing framework designed for mobile applications. It automates user interactions and verifies interface states by synchronizing test execution with the internal readiness of the application, ensuring that scripts wait for background tasks, network requests, and animations to complete before proceeding. The framework distinguishes itself through native-side binary instrumentation, which allows it to monitor the application message queue and query the native view hierarchy in real time. By interacting directly with the application process, it avoids reliance on