This article explains how to save images to the Android gallery using the MediaStore API, covering permission changes across Android versions, the insertion and output stream workflow, code examples in Kotlin, and considerations for sharing images without unnecessary FileProvider usage.
This article explains how to build a high‑performance Android startup framework by collecting initialization tasks with custom annotations, generating code via annotation processors, injecting tasks into the application, and scheduling them using a DAG‑based algorithm that supports async execution, multi‑process, and priority handling.
This article examines the memory‑intensive behavior of Kotlin's Kapt annotation‑processing tool in large Android builds, explains its internal two‑step stub‑generation and Java‑apt workflow, analyzes OOM root causes with VisualVM, and presents a practical source‑filtering fix that dramatically reduces compile time and memory usage.
This article presents a concise side‑by‑side comparison of Java and Kotlin syntax—including logging, variables, null handling, loops, and method definitions—through practical code snippets, helping Java‑experienced developers transition to Kotlin efficiently.
Amid heightened sanctions, leading chip makers halt Russian shipments, SpaceX’s Starlink bolsters Ukraine’s connectivity, Kotlin 1.8 will remove Android Extensions, and Fujitsu announces the phase‑out of its mainframe and Unix servers, signaling sweeping changes across hardware, software, and global tech infrastructure.
This article explains how Jetpack Compose's Modifier interface is defined, how its concrete implementations such as SizeModifier, Background, Padding, CombinedModifier, and ComposedModifier form a chain, and how the foldIn and foldOut functions enable forward and reverse traversal of that chain for layout processing.
When observing LiveData in Android MVVM, developers may be misled by log deduplication, Java‑8 lambda optimizations that reuse a single Observer, automatic replay of the latest value to new observers, and shared ViewModel navigation bugs, but using an Event wrapper, reflection to reset version counters, or switching to Kotlin Flow/SharedFlow can safely avoid these pitfalls.
This document presents the background, objectives, research findings, design principles, API specifications, caching strategy, implementation details, XML usage, memory impact analysis, and conclusions of a unified rich‑media animation component that consolidates image, GIF, Lottie, pager and video handling for efficient reuse in Android RecyclerView lists.
This article dissects the Kotlin coroutine implementation by decompiling a simple coroutine, explaining how the compiler transforms suspend functions into state‑machine classes, how launch creates an AbstractCoroutine, how the dispatcher intercepts and schedules execution, and how the coroutine is suspended and later resumed through Continuation mechanisms.
This article introduces the fundamentals of Gradle as a universal build automation tool and explains how the Android Gradle Plugin integrates with it, covering project structure, build files, tasks, the three build lifecycle phases, DSL syntax, and provides example Groovy/Kotlin scripts for configuring Android applications.
Part 4 of Airbnb’s Android testing series presents a dedicated framework that lets developers write concise, single‑function unit tests for ViewModel classes by specifying initial state, parameters, and expected state or dependency calls through a Kotlin DSL, integrating with JUnit, Robolectric, Mockito, and offering scaffolding and IntelliJ plugins for streamlined, systematic ViewModel logic verification.
This article introduces Jetpack Compose, Google’s modern declarative UI toolkit for Android, explaining its origins, core concepts of declarative UI, basic usage, essential components like Text, Button, Image, layout containers, modifiers, state management, and provides practical code examples to help developers build efficient, modern Android interfaces.
This article presents a Kotlin compiler plugin that replaces verbose annotation‑based serialization with delegate‑based syntax, dramatically improves code readability, reduces boilerplate, and achieves up to 20% faster compilation while providing detailed implementation steps, performance results, and practical guidelines.
This article provides a comprehensive introduction to Kotlin Coroutines, covering their history, core concepts like CoroutineContext, Dispatchers, Job, Deferred, and suspend functions, and demonstrates practical Android usage with code examples for launching coroutines, handling concurrency, networking, Room database operations, timeouts, exception handling, and Flow-based timers.
This article reviews classic Android architectural patterns—MVC, MVP, and MVVM—highlights their limitations, introduces the MVI pattern as a more streamlined alternative, and provides a detailed Kotlin implementation with ViewState, ViewEvent, and unidirectional data flow examples.
The article explains how bytecode‑level reference detection—implemented via a custom Gradle plugin that uses JavaAssist or ASM to scan compiled .class files for missing or inaccessible methods, fields, and classes—can automatically catch runtime‑crash‑inducing errors in large modular Android projects, offering configurable strict or warning modes to enhance build safety.
This article introduces Jetpack Compose for Web, a JetBrains‑backed multi‑platform UI framework that lets developers write Kotlin code once and render responsive web interfaces, showcasing its features, composable DOM API, and several code examples for building cross‑platform user interfaces.
This article demonstrates how Kotlin Flow and Channel can address common Android development challenges such as ViewModel‑View communication and event handling, compares alternatives like LiveData and RxJava, and presents a practical MVI architecture implementation with code examples.
This tutorial explains how to create a smooth, animated carousel in Android using MotionLayout and its Carousel helper, covering core concepts, state definitions, XML layout and MotionScene configurations, Kotlin adapter implementation, and practical tips for handling view ordering and visual effects.
This tutorial walks through creating a fully custom RecyclerView LayoutManager and SnapHelper in Kotlin, covering layout measurement, item scaling, inertia scrolling, and automatic centering of the nearest item, complete with code snippets and visual examples for a smooth, dynamic UI list.
This article presents a Kotlin compiler plugin that replaces verbose annotation‑based serialization with concise delegated properties, explains its design and implementation details, demonstrates significant compilation‑time reductions of up to 20% and cleaner code, and provides a step‑by‑step guide for developers interested in building similar compiler extensions.
This article details how the Android Room library added experimental Kotlin Symbol Processing (KSP) support to replace KAPT, describing the performance benefits, the architectural challenges of creating an X‑Processing abstraction layer, the testing infrastructure built around it, and the remaining limitations and future work.
This article details the redesign of Snowball's Android network framework using OkHttp and Retrofit, covering motivations, architectural layers, solutions for domain switching, custom annotations, data validation, migration strategy, and the resulting performance and maintainability improvements.
This article explains how to combine Retrofit with Kotlin coroutines on Android, compares the traditional RxJava method with coroutine-based implementations, and presents two encapsulation techniques—using a DSL and leveraging CoroutineExceptionHandler—to simplify asynchronous network calls and centralize error handling.
This article explains two Kotlin‑based network request wrappers for Android that reduce boilerplate by using LiveData, Retrofit, OkHttp and coroutines, compares their design trade‑offs, provides complete Activity, ViewModel, Repository and BaseRepository code samples, and shows how to handle loading, success, error and multiple data sources in a clean MVVM architecture.
This article explains how Android 12 introduces reconfigurable widgets, default configuration flags, new size attributes, responsive layouts, compound button interactions, and simplified collection RemoteViews, providing developers with richer, more interactive widget experiences on mobile devices.
This Jetpack Compose animation tutorial demonstrates how to create state‑driven, visibility, size, cross‑fade, single‑value, and composite animations using declarative APIs such as remember, mutableStateOf, AnimatedVisibility, animateContentSize, animate*AsState, and updateTransition, showing concise Kotlin code that simplifies UI animation development.
Airbnb’s new Android automation testing framework replaces flaky Espresso tests with deterministic UI rendering by simulating immutable State objects via MvRx, Epoxy, and a custom DSL, enabling fast, reliable tests, easy mock generation, and a launcher for instant screen inspection across multiple state variants.
This article shares a developer’s experience converting a Java Spring Boot microservice to Kotlin, covering why Kotlin is attractive, required Maven plugins and dependencies, code‑migration quirks such as open classes and @Jvm annotations, testing hurdles, and the final decision to revert to Java.
This article presents a Kotlin‑based technique for removing the repetitive BaseResponse wrapper from Retrofit calls by introducing a custom Converter.Factory and annotation‑driven ConvexTransformer that automatically extracts the data payload.
This article explains how Gradle 7's Version Catalog feature lets you centralize and share dependency versions, bundles, and plugin declarations across modules and projects, offering type‑safe accessors, version separation, and easy publishing through Maven, with practical code examples and configuration steps.
This article analyzes the limitations of traditional Android exposure tracking methods that rely on parent container lifecycles and introduces a reusable, low-intrusion solution using a custom layout that leverages core View lifecycle callbacks and drawing listeners to accurately detect component visibility and duration.
To improve Java‑Kotlin interoperability, the article recommends treating Kotlin exceptions as unchecked while enforcing Java‑style checked‑exception discipline through lint checks, using specific custom exceptions, avoiding broad catches or throws of Throwable, logging via a Monitor, and never returning from finally blocks to reduce crashes.
Jetpack Compose is a new Android UI framework that replaces traditional View and ViewGroup with a declarative approach, allowing developers to write less code, achieve faster development, and create more maintainable applications.
This article explores software architecture concepts by drawing parallels with building design, explains the goals of architectural design such as scalability and maintainability, and demonstrates a practical Android MVVM implementation using WanAndroid with clean‑architecture patterns, Kotlin, and modular project structure.
The article explains how compile‑time annotation processors in Android replace costly runtime reflection by generating binding classes during build time, showing step‑by‑step code examples, JavaPoet/KotlinPoet usage, and the performance benefits for cleaner, faster, maintainable apps.
The 2021 JVM ecosystem report, based on responses from over 2,000 Java developers worldwide, shows OpenJDK now dominates with 77% market share, Java 11 surpasses Java 8 in production, Kotlin gains traction, IntelliJ IDEA leads IDE usage, and Maven remains the top build tool.
This article introduces Jetpack Compose for Web, a Kotlin‑based UI toolkit from JetBrains that enables developers to create responsive web interfaces and share UI code across Web, desktop, and Android platforms, illustrated with practical code examples and styling techniques.
This article explains how Kotlin coroutines simplify asynchronous programming on Android by using suspension, detailing core concepts, APIs, dispatchers, suspend functions, and the underlying implementation through decompiled bytecode and continuation‑passing style, complemented by practical code examples and execution logs.
This article discusses implementing event tracking in mobile applications using Kotlin, including creating extension methods for cleaner code, handling third-party platform limitations with Selenium, and sharing practical experiences from multiple project versions.
Jetpack Compose for Web, JetBrains' new UI debugging tool, lets developers write Kotlin‑based responsive web interfaces that can be shared across Web, desktop, and Android, offering composable DOM APIs, multi‑platform widgets, and practical code examples for building and styling UI components.
Jetpack Compose for Web, JetBrains' new Kotlin‑based framework, lets developers write responsive web interfaces that share code with desktop and Android, offering composable DOM APIs, multi‑platform widgets, and practical code examples to accelerate UI development.
The article explores the author's five‑year journey with Kotlin on the server side, examines common objections such as lack of time, perceived language hype, tooling preferences, hiring concerns, and mixed‑language codebases, and offers practical advice for teams considering a gradual Kotlin adoption.
This article explains how to create a custom Android Lint rule that traverses Gradle projects to automatically collect module dependencies, generate a Mermaid‑compatible markdown diagram, and refine the graph by removing redundant edges, providing developers with up‑to‑date visual dependency maps.
This article describes how the Snowball Android team solved the slow‑frame issue on the fund detail page by implementing a split‑screen loading layout using RecyclerView, CoordinatorLayout, and ViewPager, focusing on achieving a linked scrolling effect for the bottom discussion overlay through custom BottomSheetBehavior extensions and nested scrolling mechanisms.
This article introduces Jetpack Compose, explains why it replaces XML‑based Android UI, walks through environment setup, Gradle configuration, and dependency inclusion, demonstrates the setContent and XML integration methods, explores composable functions, state management, list rendering with LazyColumn, and shares practical tips and reflections on declarative UI development in Android.
To cut full‑build times in large Android projects, the team pre‑compiles each library module into an AAR, publishes it to a Maven repository, computes a content‑plus‑dependency‑graph hash to detect existing AARs, and automatically swaps project dependencies for matching AARs while addressing duplicate‑class and version conflicts.
The article examines why many Java server‑side developers resist switching to Kotlin, exploring misconceptions about learning time, language maturity, pride, tooling, hiring costs, complexity, codebase mixing, and perceived lack of benefits, while offering practical insights to encourage adoption.
This article provides an in‑depth tutorial on Jetpack Compose's Text composable, detailing every available attribute, usage examples, styling techniques, selectable and clickable text handling, annotated strings, and practical implementations such as hyperlink integration for Android developers.
This article introduces several classic design patterns—Singleton, Factory, Builder, Prototype, Decorator, Strategy, Template Method, and Observer—showing how they can be implemented concisely in Kotlin with code examples, while also explaining the underlying language features such as object declarations, companion objects, delegation, lazy initialization, and higher‑order functions.
This article explains Kotlin coroutine fundamentals, creation, launch and async usage, suspension functions, withContext, and compares coroutine-based implementations with RxJava in Android development, providing code examples and best‑practice guidance, including performance considerations and migration advice.
This article explains how to use Android ConstraintLayout helper widgets such as Flow, Layer, ConstraintHelper, and ImageFilterView, covering their properties, wrap modes, XML configuration, Kotlin animation code, and runtime adjustments with SeekBar to create dynamic UI layouts.
This article provides a comprehensive Kotlin tutorial for Android developers, covering basic syntax, variable declarations, control statements, functions, classes, objects, delegation, and standard library utilities, illustrated with clear code examples and explanations.
The article explains why Java’s anonymous inner classes require captured variables to be final or effectively final, how this behavior changed after Java 8, and why Kotlin allows modification of such variables, illustrating the differences with decompiled code examples.
This article presents a complete solution for monitoring Fragment visibility in Android, covering simple replace operations, hide/show handling, ViewPager nesting, AndroidX adapter behaviors, and a reusable BaseVisibilityFragment implementation with Kotlin code examples.
The article explains reactive programming fundamentals, shows why traditional OO assignments struggle with dynamic data relationships, and introduces the LiveData Extensions library that leverages MediatorLiveData to create lifecycle‑aware, chainable operators (map, filter, merge, etc.), dramatically reducing boilerplate and improving code metrics in Android apps.
This article provides a detailed technical analysis of LeakCanary 2.0, covering its Kotlin‑based integration, the new self‑implemented Hprof parser, detection workflow, core classes such as AppWatcher and ObjectWatcher, graph indexing, and the algorithm used to locate the shortest GC‑root leak path.
This article explains how Retrofit 2.6.0 adds support for Kotlin suspend functions by detecting the Continuation parameter, determining the return type, and generating appropriate CallAdapter implementations such as SuspendForResponse and SuspendForBody to integrate coroutine handling with OkHttp.
This article examines the classification of mobile apps, the shortcomings of an H5‑based cash register, the rationale for adopting Kotlin over Java, a detailed overview of Kotlin’s language features and differences, practical implementation details, interoperability, null‑safety techniques, encountered issues, and the performance gains achieved after native migration.
This article explains how Ctrip's flight Android app refactored its home page using Kotlin coroutines, Jetpack AAC components, and MVVM architecture, detailing the technical and business background, code patterns, production issues, and lessons learned for large‑scale mobile development.
This article introduces Kotlin’s growing role in backend development, explains its interoperability with Java, and walks through creating a Spring Boot microservice using Kotlin, including project setup with Spring Initializr, Maven configuration, and sample code for a simple web endpoint, illustrating the benefits of concise Kotlin syntax.
This article introduces Kotlin for backend development, explains why Kotlin works well with Spring Boot, and provides a step‑by‑step tutorial—including Maven setup, essential dependencies, and sample Kotlin code—to create a simple Spring Boot web application.
This article provides a comprehensive source‑code walkthrough of Kotlin coroutines, explaining how launch creates a coroutine, how the compiler transforms suspend functions into state‑machine classes, and detailing the mechanisms of suspension and resumption through Continuation, Dispatchers, and the coroutine scheduler.
This article introduces Kotlin for backend development, explains its advantages over Java, and provides a hands‑on tutorial with Maven configuration, source code, and deployment steps to create a simple Spring Boot web service using Kotlin.
This article explains Android WorkManager’s role in unified background task management, outlines its features and suitable scenarios, demonstrates how to create workers, configure work requests, and provides a detailed walkthrough of its initialization, scheduling, and execution processes through extensive source‑code analysis.
This guide demonstrates how to integrate Spring Boot 2.0.5 with Elasticsearch 5.6.11 by installing Elasticsearch and Kibana, adding the required Maven dependencies, configuring the client via application.yml or Java code, defining @Document‑annotated entities, implementing repository, service and controller layers for CRUD and full‑text search, handling Netty conflicts at startup, and verifying the setup with health, list and search endpoints.
The article explains why Java anonymous inner classes can only access final or effectively final variables, shows the compiler‑generated bytecode that enforces this rule, and contrasts it with Kotlin's approach of wrapping primitives to allow modification inside such classes.
This article provides a comprehensive guide to Kotlin coroutines, covering their concepts, creation methods (launch, runBlocking, async), nesting, suspend functions, cancellation, timeout handling, dispatchers, scopes, underlying implementation, and a practical Retrofit‑OkHttp example for asynchronous network requests in Android.
This article explains the background pain points of hard‑coded cross‑stack navigation in a mobile app, describes a dynamic routing component built on URL interception, regex matching and replacement, shows Kotlin and iOS implementations, and demonstrates real‑world cases in an app center and order module.
This article outlines Google's Kotlin‑first strategy, practical steps for teams and code to transition from Java to Kotlin in Android projects, including appointing a Kotlin champion, using Android Studio's conversion tool, gradual migration practices, and interoperability considerations.
This article presents a comprehensive solution for tracking and reporting exposure of RecyclerView items in Android, covering data collection during scrolling, visibility changes across fragment and activity lifecycles, handling data updates, and providing customizable callbacks and exposure criteria, all without requiring developers to manage the collection process manually.
This article introduces how to create custom Android Views by overriding onMeasure, onLayout, and onDraw, explains the three-stage view rendering process, and provides detailed examples of Canvas drawing methods—including drawing points, lines, shapes, text, images, and bitmap manipulation—along with code snippets and usage tips.
The article shares personal experiences with Kotlin coroutines, highlighting debugging challenges, loss of context across threads, pitfalls of using ThreadLocal, synchronization issues, and performance trade‑offs, ultimately explaining why the author stopped using coroutines for server‑side development.
A junior Android developer learns to extract a card UI into a reusable layout, replace repetitive findViewById code with a custom view, then streamline everything further using Jetpack ViewBinding and Kotlin extension functions, dramatically cutting boilerplate and simplifying maintenance.
This article examines seven modern programming languages—Rust, Go, Kotlin, TypeScript, Swift, Dart, and Julia—detailing their key features, typical use cases, popularity trends, and why developers should consider learning them to stay competitive in today's software landscape.
The article examines recent TIOBE rankings and explores how emerging languages such as Go, Rust, Swift, Dart, and Kotlin compare to established giants like C, C++, Java, and JavaScript, analyzing their design goals, adoption, and prospects for replacing legacy code.
Android 11 Developer Preview 3 brings new debugging APIs, system‑level wireless ADB, faster incremental APK installation, data‑access auditing, plus updates to CameraX, Dagger integration, Kotlin object usage, high refresh‑rate rendering, and the latest AndroidX library releases.
This article introduces ten impressive open‑source Android UI libraries—ranging from liquid swipe animations to animated bottom navigation bars—provides Gradle dependencies, Kotlin/Java usage examples, XML integration steps, and visual screenshots to help developers quickly adopt these tools in their apps.
This article reviews the evolution of Android permission management, explains the concept of dynamic (runtime) permissions, compares it with iOS practices, and provides step‑by‑step Kotlin/Java code examples for checking, requesting, and handling permission results, along with compatibility considerations across devices and ROMs.
This article explains the concept, history, and implementation of Android dynamic (runtime) permissions, detailing the evolution of permission models, code examples for checking and requesting permissions, handling callbacks, compatibility across Android versions and OEM customizations, and best‑practice strategies for developers.
This article introduces Jetpack Compose, Google's modern declarative UI toolkit for Android, covering its history, installation steps, adding Compose to existing projects or creating new ones, basic composable functions, layout techniques with Column, Container, Spacer, Material Design styling, and preview capabilities, all illustrated with Kotlin code examples.
This article details the design and implementation of Ctrip's hotel Android map features, covering business background, module architecture, coordinate system handling, multithreading challenges, and practical solutions such as MVP, AsyncTask, and atomic flags to ensure smooth user experience.
The article explains why Java’s anonymous inner classes still forbid modifying captured primitive variables after Java 8, how the compiler enforces this by copying values, and why Kotlin can modify them by using reference‑style wrappers.
This article proposes a solution to avoid data inconsistency caused by RecyclerView ViewHolder reuse by giving each ViewHolder its own lifecycle, integrating MVVM via a BaseLifecycleViewHolder, BaseLifeCycleAdapter, and VHLiveData, and demonstrates implementation details with Kotlin and Java code examples.
Savitar, a custom Android Studio plugin suite, accelerates incremental compilation by detecting changed files with Watchman, gathering project metadata, invoking javac/kotlinc and AAPT2 for on‑demand builds, and hot‑loading Dex and resources at runtime, cutting average incremental build time from 110 seconds to 15 seconds and saving thousands of developer hours.
This article explains the motivation, design, implementation, and deployment of a Kotlin static‑analysis IDE plugin that provides real‑time code‑style checks for Android developers, covering tool exploration, AST/PSI parsing, rule creation, architecture layers, and practical installation steps.
The article demonstrates that Kotlin coroutines on the JVM are merely a convenient API layered on traditional Java threads rather than true lightweight coroutines, contrasting them with Go’s M:N goroutine scheduling, and discusses experimental Kotlin‑Native and OpenJDK Loom projects that aim to provide genuine coroutine support.
Dice Insights analyzed TIOBE, RedMonk rankings and its own job database to highlight five programming languages—Swift, Kotlin, Python, Groovy, and TypeScript—that are projected to experience rapid growth and increased adoption in the coming years.
This article explains why excessive null‑checks cause a "null‑check disaster", introduces the Null Object design pattern and Java 8 Optional as clean alternatives, and showcases the NR Null Object IntelliJ plugin that can generate null‑object scaffolding automatically.
Kotlin’s function features—including expression bodies, named and default arguments, top‑level and extension functions, local functions, lambdas, member references, and the utility functions with and apply—enable Android developers to write concise, expressive, and boiler‑plate‑free code.
Spring Framework 5.2 has been officially released, bringing deep Kotlin 1.3 integration, enhanced reactive support for WebFlux, RSocket, and data stores like R2DBC, MongoDB, and Neo4j, along with a comprehensive list of new features and improvements for developers.
Hamber Luo, Android lead at Jike app, will present at Droidcon Shanghai 2019 on Android Jetpack Permissions, sharing his extensive Android experience, a code example, and practical advice for quickly adopting Jetpack and Kotlin in mobile development.
This article explores the key differences between Kotlin and Java for Android development, covering constructors, init blocks, val versus final, static equivalents with companion objects, top‑level declarations, arrays, collections, sequences, visibility modifiers, and includes practical exercises.
Google and Udacity have launched two free Kotlin video courses that teach beginners the language fundamentals and guide them through building Android apps, covering Jetpack components, popular libraries, and coroutines, ultimately enabling the creation of over ten practical applications.
This guide walks Android engineers through adding Kotlin support to new or existing projects, explains Kotlin's variable declarations, null‑safety features, type inference, val/var usage, visibility modifiers, class inheritance, open/final semantics, and safe casting, providing concise code examples and practical tips.
This article introduces Kotlin DSL concepts, demonstrates real‑world applications such as Trip.com payment network encapsulation, overseas payment SDK Gradle scripts, Anko layouts, and provides a step‑by‑step example for creating a custom DSL, highlighting benefits, trade‑offs, and best practices for mobile development.
Based on Dice Insights’ analysis of TIOBE, RedMonk and internal hiring data, this article highlights five programming languages—Swift, Kotlin, Python, Groovy, and TypeScript—that are expected to experience rapid growth in the coming years, explaining the reasons behind each trend.
This article explains the code types involved in synchronous remote calls, demonstrates how blocking IO leads to callback hell, and shows how to simplify the programming model using Java CompletableFuture, AsyncHttpClient, and Project Reactor’s reactive streams to efficiently retrieve city data.
This article reviews the evolution of front‑end programming languages, discusses why extreme attitudes toward language choice hinder productive discussion, explains how platform constraints shape language selection, examines the strengths and weaknesses of JavaScript, Java, and Objective‑C, and predicts increasing convergence and cross‑platform trends among modern front‑end languages.
This article examines Kotlin Multiplatform's evolution, detailing native compilation, cinterop bindings, platform libraries, bidirectional Swift/Objective‑C interop, and practical cross‑platform implementations for logging, file I/O, and SQLite, while outlining future directions and tooling recommendations.
