This article explains the differences between stack and heap memory on Android devices, outlines typical memory problems such as high usage, leaks, and overflow, and demonstrates practical testing methods using the dumpsys meminfo command and the LeakCanary library with code examples.
This article introduces a self‑developed Android performance monitoring app, explains how to install, start, and view test results, and details the underlying data‑collection mechanisms for memory, battery, CPU, and FPS metrics, providing practical guidance for developers.
This guide walks through creating a Jenkins job to pull Android source code from Git, configure Gradle invocation, add FIR.IM QR‑code generation, troubleshoot common SDK environment issues, and update Android SDK and build‑tools via command‑line steps.
This article explains how Android P’s DP1 preview restricts non‑SDK API usage by detailing the hidden‑API greylist mechanism, the compilation‑time processing that marks methods and fields in dex files, and the runtime checks performed by the ART virtual machine to enforce these restrictions.
This article introduces the minicap tool—a native NDK‑based screen‑capture solution for Android—explaining its advantages over the built‑in screencap command, how to compile or obtain binaries, install them on a device, and run it to obtain high‑speed, low‑size screenshots for automation testing.
To avoid crashes and missing messages caused by newer Android restrictions on Toast—such as disabled notifications, BadTokenException on pre‑8.0 devices, and token‑null errors on Android 7.1—developers intercept Toast.show with AspectJ, replace it with a custom MToast, handle exceptions, and ultimately migrate to a robust Snackbar‑based notification system.
The article opens with Confucius' teachings on knowledge and inquiry, then presents a developer's issue where MotionPro VPN disconnects on Android, outlines two main causes—lack of app trust and background cleaning by phone managers—and provides clear steps to whitelist the app and reinstall it with trust enabled.
This article examines the Android P DP1 hidden‑API restrictions, detailing the compilation‑time generation of grey‑list files, the transformation of access flags in DEX structures, and the runtime checks performed by the ART virtual machine to enforce non‑SDK call limits.
This article examines the evolution of Android architectural patterns—from MVC, MVP, and MVVM to Flutter‑derived frameworks and Android Architecture Components—explaining their layering, communication mechanisms, and how router‑based decoupling can achieve fully modular mobile applications.
This guide explains how to decode a video, render a watermark with OpenGL, re‑encode the frames, and mux them into a new file on Android, covering texture types, viewport positioning, blending, and the required MediaCodec and MediaMuxer code.
This tutorial explains how to use Android's MediaCodec to encode video frames—either via byte arrays or an input Surface—and then combine the encoded video with audio using MediaMuxer to produce a synchronized MP4 file, complete with code samples and step‑by‑step guidance.
This guide explains how to install and configure Charles to simulate slow or high‑latency mobile networks, including enabling throttling, selecting presets, and restricting throttling to specific hosts for effective app performance testing.
The article explains how Android P disables hidden (non‑official) APIs, describes the reasons behind the restriction, outlines the grey‑list classification, provides verification steps and code examples for testing, and warns developers of the potential consequences for apps that rely on these APIs.
This guide explains how to convert video stream data into individual bitmap images on Android by using SurfaceTexture to receive decoded frames, OpenGL to render them as external textures, and glReadPixels to capture the RGBA data for saving as PNG files.
This article explains how Android P disables the use of hidden (non‑SDK) APIs, describes the official restrictions and grey‑list classifications, provides verification steps and download links, and demonstrates a practical reflection test on the WifiManager hidden field, highlighting the impact on developers.
This article introduces a PickerView library for Android, comparing it with existing libraries and providing examples of its usage in mobile applications.
This guide walks through using Android's MediaCodec with a TextureView to extract, decode, and render video frames, covering setup of TextureView, MediaExtractor, handling input and output buffers, synchronizing playback with PTS/DTS, and adding audio playback via AudioTrack and Sonic library.
Facing duplicated codebases as Meituan Waimai expanded from a single app to multiple channels, the team iteratively tried split libraries, componentization, and MVP layers before settling on a three‑layer platform architecture—platform, business, and host—isolated via Gradle projects, product flavors, and tooling to achieve sustainable, cross‑product code reuse.
This tutorial walks through the complete Android MediaCodec workflow, covering creation, configuration, synchronous and asynchronous data handling, buffer management, and proper end‑of‑stream signaling for both encoding and decoding scenarios.
The article describes the background, architecture, and implementation details of a non‑intrusive Android SDK that monitors UI‑thread stalls, collects performance data, aggregates it on the server, and automatically generates work orders to help developers pinpoint and resolve lag issues efficiently.
This article explores Android’s MediaCodec API, detailing its role in hardware video encoding/decoding, buffer management, data types, lifecycle states, and practical code examples, providing developers with a comprehensive guide to implementing advanced video processing features such as watermarking and transcoding on mobile devices.
This article describes the background of Android thread freeze issues caused by deadlocks, presents a client‑server monitoring architecture that captures thread and lock information via system traces, details automated analysis methods for deadlock detection and non‑deadlock causes, and shares the observed performance improvements and future plans.
An Android SDK project's shift from HTTPS to RSA‑encrypted HTTP prompts a deep dive into AES encryption, tracing its historical roots from early ciphers through DES and Triple‑DES, culminating in the Rijndael design, while illustrating core cryptographic concepts of confusion, diffusion, and secret keys.
The article outlines comprehensive automated performance testing approaches for Android and iOS applications, covering challenges of data accuracy, reliability and volume, and describing configurable UI automation, remote device management, data collection, and reporting mechanisms to enable scalable, low‑effort mobile testing.
Holmes is a zero‑cost dynamic logging system for Android apps that automatically instruments every method to emit trace logs, stores them locally, and lets developers remotely retrieve precise execution histories and run Lua scripts for on‑device snapshots, dramatically reducing debugging time despite fragmentation and low performance impact.
This guide walks through installing the required tools, configuring Appium with Python on Windows, extracting an Android app's package and activity, writing a basic automation script, launching the app, using uiautomatorviewer for element location, and applying tips for Chinese input and service timeout handling.
This article investigates an Android JNI native crash caused by misusing NewString(), examines why a custom UTF‑8‑to‑UTF‑16 conversion was used instead of NewStringUTF(), compares Dalvik and ART string encodings, reveals a Dalvik UTF‑8 conversion bug fixed in ART, and advises developers on encoding nuances across Android versions.
This article introduces the ELF file format used in Linux and Android, explains its three main types, compares it to Windows PE, and outlines how linkers and loaders interpret ELF headers, sections, and segments for native development and reverse engineering.
Logan is Meituan‑Dianping’s native C‑based mobile logging library that uses MMAP caching, streaming compression and encryption, and a unified protocol to eliminate Java‑heap GC pauses, prevent log loss, secure data, and provide efficient retrieval and proactive reporting across dozens of apps.
The article explains how Android hooking frameworks Xposed Installer and Cydia Substrate operate and provides practical Java‑ and native‑level detection methods—such as package‑name checks, stack‑trace inspection, memory‑map scanning, and signature matching—to identify their presence and strengthen app security.
This article explains the causes and trigger conditions of Android ANR, describes the underlying message‑driven mechanism, and compares four popular detection approaches—BlockCanary, ANR‑WatchDog, SafeLooper, and FileObserver—highlighting their advantages, limitations, and practical usage recommendations.
This article details DingTalk's Android accessibility journey—starting in mid‑2017, collaborating with the Shenzhen Information Accessibility Research Association, leveraging TalkBack, implementing contentDescription, focus navigation, custom views and services, and emphasizing thorough testing—to empower millions of visually impaired users in China.
This article explains how the two essential Gradle plugins—replugin-host-gradle and replugin-plugin-gradle—generate configuration files, inject AndroidManifest components, create built‑in plugin descriptors, and use Transform API to modify bytecode, enabling seamless plugin development and integration in Android projects.
The article compares Android small‑window video playback techniques—SurfaceView, GLSurfaceView and TextureView—detailing their animation limitations, providing source‑code examples for embedded and floating implementations, and showing that TextureView combined with a singleton player offers the smoothest, most reliable small‑window experience.
This article explains the Android Paging Library’s architecture—including DataSource variants, PagedList configuration, and PagedListAdapter integration—showing how to efficiently load large data sets from single or multiple sources while handling threading, prefetching, and UI updates.
A security bulletin released on January 9 2018 details a critical Android WebView cross‑origin vulnerability that can expose user privacy data and credentials, outlines its widespread impact on many apps, and provides detection tools and concrete remediation steps for developers.
The article examines Android Toast crashes, explains the system‑level window and drawing lifecycle, and proposes safer alternatives by replacing Toast with a Snackbar or custom view hierarchy, using parent‑finding logic, weak‑reference management, and a protective handler wrapper to prevent exceptions.
This article explains why Android UI lag hurts user experience, reviews traditional adb‑based detection methods, introduces a new in‑app monitoring system that leverages Looper log matching and Choreographer.FrameCallback to capture precise stack traces, and describes its implementation, performance impact, data processing pipeline, and real‑world results.
This guide explains what Fresco is, shows how to add its dependencies, use SimpleDraweeView in XML, and details a plugin‑friendly approach for sharing Fresco across host and RePlugin modules by converting the drawee AAR to a JAR and handling custom attribute callbacks.
This article compiles essential Java fundamentals and Android development interview questions—from interface purpose and abstract classes to thread blocking, memory leaks, service lifecycles, layout optimizations, and common design patterns—providing concise explanations and code snippets to help candidates ace technical screenings.
The article examines common Android Toast problems, detailing exceptions like WindowManager$BadTokenException and sporadic display failures, explains how Toast uses a system TYPE_TOAST window, analyzes the underlying source code, and offers practical solutions to prevent and fix these issues.
This article traces the five‑year evolution of Android plugin technology, comparing representative frameworks across three generations, and delves into core mechanisms such as class loading, resource handling, and activity lifecycle management, while providing detailed code examples and discussing future directions like componentization and app sandboxing.
This article details how Youku rebuilt its Double‑11 live‑streaming platform with Weex, covering the overall architecture, component modularization, interactive feature support, gesture conflict resolution, screen‑rotation handling, video corner rendering, performance optimizations, and the impressive results achieved during the event.
The article shows that replacing reflection‑heavy Gson with lightweight JSONObject for manual serialization and a compile‑time annotation‑processor generated library called Mson can cut JSON parsing and writing time to about one‑tenth, while maintaining compatibility and eliminating ProGuard rules for performance‑critical Android apps.
The Android Checkout library wraps Google Play’s In‑App Billing API, providing a streamlined, lifecycle‑aware interface that handles service binding, request queuing, caching, purchase verification, and pagination, while exposing core classes such as Billing, Request, Checkout, Inventory, and configuration to simplify integration despite added synchronization overhead.
This article introduces the open‑source Android screen‑capture tool Minicap, examines its architecture and command‑line usage, and details code modifications that enable real‑time rotation detection, dynamic resolution changes, and inclusion of rotation metadata in the image stream for more reliable remote device display.
The article compares Android’s SurfaceView, GLSurfaceView, and TextureView for picture‑in‑picture video playback, explaining each view’s rendering model, the hole‑punch limitations of SurfaceView, Android N’s synchronous updates, and TextureView’s full transformation support at higher power cost, to guide developers in choosing the optimal solution.
The article outlines a systematic method for structuring native‑layer code and using dlopen, dlsym, and dlclose to dynamically load and unload .so libraries on Android, enabling selective loading, reduced memory usage, hot‑fix updates, and solutions to STL version, permission, and C++ name‑mangling challenges.
Shield is Meituan‑Dianping’s open‑source modular UI framework for Android and iOS that splits pages into independent, lifecycle‑managed modules (Agents) defined by a remote configuration, enabling dynamic layout changes, cross‑platform consistency, decoupled communication via a RxJava‑based WhiteBoard, and easier maintenance and testing.
This article provides a comprehensive guide to Android's Room persistence library, covering the creation of Entity classes, defining Data Access Objects (DAO), building the RoomDatabase, handling foreign keys, embedded objects, query methods, LiveData and RxJava return types, as well as database migrations and type converters for complex data types.
This article examines the current Android security landscape, outlines the platform's security model, discusses program, data, and system vulnerabilities, analyzes a tampered APK case study, and presents comprehensive protection techniques such as obfuscation, shelling, and integrity verification.
This article explains how 360 Mobile Guard, a massive Android security app built on the RePlugin framework, implements a comprehensive performance monitoring system—including offline code checks, Argus APM tools, online crash and metric collection, diagnostic plugins, and future AI-driven analysis—to identify and resolve performance issues and improve user experience.
This article explains the background of Android app signing, outlines the core security objectives of confidentiality, integrity and availability, compares static and dynamic JNI registration methods, demonstrates native signature verification and certificate integrity checks, and summarizes common cracking techniques together with practical hardening solutions.
This article explains the differences between GL threads and regular threads, how textures are bound to EGL contexts rather than threads, why textures cannot be shared across GL threads by default, and how to correctly share OpenGL data between threads on Android.
This article describes the design and implementation of a non‑intrusive Android SDK that monitors main‑thread UI lag by replacing the Looper printer, sampling stack traces, aggregating data on the server, and automatically generating work orders for precise performance optimization.
This tutorial walks you through installing the Fireline Jenkins plugin, configuring a Jenkins job to run Android static code analysis for security, memory‑leak, and Alibaba P3C rule checks, and displaying the generated HTML report directly within Jenkins.
This article explains why the Suning+ Android app adopted the MVP pattern, details each layer's responsibilities, showcases the project’s multi‑layer structure, directory layout, and code snippets, and demonstrates how MVP reduces coupling and accelerates iterative development.
Meitu improves mobile app performance by combining HTTP DNS for critical domains with fallback LocalDNS, employing lazy cache updates and a non‑intrusive SDK that injects custom resolution via Java reflection and native ELF redirection, resulting in roughly 100 ms latency reduction and fewer unknown‑host errors.
This article explains the principles of TCP long connections, compares NIO and BIO models, and describes how Android applications can implement and share persistent connections using AIDL, process sharing, and a dedicated SDK to support push, IM, and other real‑time services.
This article presents a comprehensive solution for capturing network packets on Android devices without rooting, compares tcpdump, Fiddler and VPNService approaches, describes a cloud‑based architecture using Go, MongoDB and libpcap, and details multiple performance optimizations that eliminate packet loss and dramatically increase CPU utilization.
This article details Meitu's comprehensive DNS optimization for Android apps, comparing LocalDNS and HTTP DNS, describing metric‑driven strategies, caching mechanisms, and a non‑intrusive SDK that works in both Java and native layers while handling HTTP, HTTPS, and SNI challenges.
This article outlines practical techniques for creating high‑performance Android apps, covering minimal library usage, streamlined design resources, asynchronous loading, build‑time reductions with ProGuard, and the importance of thorough discussion before implementation.
This article explains how to use the Model‑View‑Presenter (MVP) pattern in Android to reduce module coupling, prevent memory leaks with WeakReference, and organize code into clear layers—View, Presenter, Model, and a Data Manager—while providing step‑by‑step implementations and reusable base classes.
This article introduces Google’s ARCore platform, compares it with Apple’s ARKit, explains its relationship to Tango, details its core capabilities such as motion tracking, environmental understanding and light estimation, showcases several demo experiences, and outlines the key ARCore API components for developers.
The article details Android’s touch‑event pipeline, tracing how a physical press generates a GPIO interrupt, is read by Linux /dev/input drivers, passed through the kernel’s EventHub to the InputManagerService, dispatched by InputDispatcher, routed via WindowManagerService and InputChannel to ViewRootImpl, and finally delivered to the target View, helping developers debug and customize input handling.
This article explains the Observer pattern’s one‑to‑many dependency concept, outlines its key components, provides a step‑by‑step Java implementation—including a custom news provider and user observer—demonstrates usage with JDK’s built‑in classes, and connects the pattern to Android callbacks.
The article explains Android image downsampling, comparing built‑in nearest‑neighbour and bilinear methods with higher‑quality bicubic and Lanczos resampling, detailing their implementation, performance trade‑offs, and visual results, and advises choosing the fastest method for simple cases or the more intensive algorithms when superior image fidelity is required.
This article compares Kotlin and Java for Android development, highlighting Kotlin's lower migration cost, reduced technical risk, language conveniences such as null‑safety, data classes, extension functions, functional programming, JavaScript interop, potential pitfalls, and step‑by‑step setup instructions.
This article demonstrates how to automatically enable USB debugging on a non‑root Android phone after reboot by installing a high‑permission app that uses an AccessibilityService to detect the debug state, launch the developer options, and simulate user interactions to toggle the setting.
The article analyzes the chaotic state of Android push notifications in China, explains the government's United Push Alliance initiative, details the proposed unified SDK architecture, and offers practical guidance for developers to build efficient, user‑friendly, and secure push systems.
This article examines Android's quality image compression, detailing Bitmap.compress() behavior, the Skia engine's role, Huffman coding optimization, libjpeg settings, and differences from iOS, while recommending newer libraries and techniques for improved compression efficiency.
The article details how Baidu MTC designed and implemented a universal Android script testing platform that combines UIAutomator, a custom Clean‑SDK for popup handling, image‑recognition algorithms, and a recording‑playback tool to enable robust, non‑native mobile automated testing across thousands of devices.
This comprehensive guide explores Android Fragments in depth, covering their definition, modular advantages, core classes, dependency on support libraries, basic and dynamic usage, lifecycle methods, transaction handling, back‑stack mechanics, communication patterns, DialogFragment creation, ViewPager integration, lazy loading techniques, and practical code examples.
A recent Realm survey of around 100,000 developers shows Kotlin’s rapid rise in Android apps, predicting it will surpass Java as the primary language by the end of 2018, driven by Google’s official support and Kotlin’s modern, concise syntax.
Meituan’s Android plugin framework combines MultiDex‑style dex loading, global AssetManager replacement, component proxies, and a four‑phase Gradle integration to enable stable AAR‑based development while dynamically loading plugins across Android versions and OEM ROMs, handling resources, bytecode, and native libraries with minimal compatibility issues.
The article explains Android’s ContentProvider mechanism, detailing how providers are published by the system, how the ActivityManagerService registers them, and how the ContentResolver in client processes acquires and interacts with these providers across processes using Binder IPC.
This article recounts the discovery, root‑cause analysis, and engineering solution for a severe Android WeChat chat freeze bug, detailing a custom TextView layout that improves text alignment, handles edge‑case languages, and delivers near‑native performance.
This article explains the Android ANR mechanism, common scenarios that trigger it, how the system detects and logs ANR events, and provides step‑by‑step methods for locating and fixing ANR issues, illustrated with a recent WeChat bug example.
This article presents two experimental methods for automatically obtaining load‑time metrics of mobile H5 pages—one leveraging Chrome DevTools Protocol to collect network, page, DOM and runtime data from Android Chrome/WebView, and another using computer‑vision techniques to detect progress‑bar visual cues in recorded screen videos.
Google’s ARCore SDK offers motion tracking, surface detection, and light estimation for Android, supports a limited set of phones but can be extended to unsupported devices via a reverse‑engineered class hack, and competes with Apple’s ARKit and Google’s earlier Project Tango by delivering comparable AR features without specialized hardware.
This article introduces JD's Aura component framework, detailing its origins, four foundational pillars, three supporting systems, key tools, SDK specifications, and the associated portal, CI, and management platforms that enable scalable Android componentization within the Avatar ecosystem.
This article explains the fundamental problems an Android plugin framework must solve—component representation, class loading, resource handling, inter‑module calls, resource sharing, and packaging—and describes Aura's design choices and implementation strategies for each of these challenges.
The article explains how the Aura framework handles plugin compilation and packaging by managing shared resources through public.xml, assigning unique package IDs, and offering two solutions—modifying AAPT and using the Gradle aura‑plugin—to achieve small, independent Android plugin bundles.
The article introduces Android’s ConstraintLayout, explains how it solves performance and nesting problems of RelativeLayout, LinearLayout, and TableLayout, guides developers through setup and step‑by‑step conversions—including proportional spacing, aspect‑ratio, gone margins, and chains—present a modest 10 % performance gain versus claims, and shares practical developer insights.
The article reviews real‑world Android Binder vulnerabilities—including lock‑screen bypasses, Samsung shutdown eavesdropping, theme escalation, and system DoS—explains the Binder IPC architecture, and demonstrates how the drozer framework can be used for automated fuzzing, AIDL‑based, reflection‑based, and shell‑script exploitation of high‑privilege services.
This article examines Android video recording challenges, compares hardware (MediaCodec) and software (FFmpeg + x264/openh264) encoders, highlights device‑specific pitfalls such as color‑format support and alignment, and presents fast NEON‑based algorithms for scaling, rotation, and mirroring of YUV frames.
Vivo’s X20 guide helps developers adapt apps to its new 18:9 full‑screen display by addressing five typical problems—black borders, UI stretching, OpenGL rendering offsets, mismatched navigation‑bar colors, and fixed‑position layouts—and suggests testing with 1440×720 or 2160×1080 emulator resolutions.
The article outlines a comprehensive set of APK‑slimming techniques for the iQIYI Android client—including pluginization, 7‑ZIP recompression, apksigner signing, duplicate‑resource removal, PNG/WebP conversion, library trimming, code obfuscation, R‑class elimination, language‑config pruning and native‑ABI reduction—that together cut the package from 54.2 MB to 28.2 MB.
This article provides a comprehensive overview of the distinctive Android ROM customizations from major Chinese manufacturers—Huawei, OPPO, VIVO, Xiaomi, and Meizu—as well as key changes in Android versions 4.0 to 7.0, explaining how each feature affects app compatibility, permission handling, power management, and testing strategies.
Lottie, Airbnb’s open‑source animation library, parses After Effects‑exported JSON to render vector animations natively on Android, iOS, and React Native, letting developers share a single asset across platforms, simplify code, manage assets from assets, SD card or network, while balancing modest APK size increase against performance limits for complex scenes.
This article provides a comprehensive guide to Android system features relevant to testing, covering common functions like app management, developer options such as USB debugging and various adb commands, process statistics, visual debugging tools, and the handling of normal, dangerous, and special permissions.
The article explains how Android O uses seccomp filters in the zygote process to block unused or dangerous system calls, how developers can detect and avoid illegal calls that cause crashes, and how to test or disable the filter on development builds.
The article details how to integrate Android permission handling, directory loading, thumbnail browsing, and smooth paged scrolling into a Unity‑based Daydream media player, explaining scripts for requesting permissions, populating file selector pages, snapping to pages, and managing scroll events to enable VR file selection and playback.
When a client app acquires a stable ContentProvider reference, Android’s ActivityManagerService tracks it with a stableCount; if the provider’s server process dies—due to low‑memory kill, startup failure, or timeout—while stableCount remains above zero, AMS will terminate the dependent client process.
This article examines Android video encoding challenges, compares hardware (MediaCodec) and software (FFmpeg+x264/openh264) codecs, and presents fast YUV frame preprocessing techniques—including scaling, rotation, and mirroring—using NEON optimizations to achieve high‑quality, low‑latency recordings.
The article explains why an Android app may start several processes, causing Application.onCreate() to execute multiple times, and presents various techniques—including android:process configuration, process‑specific initialization, getRunningAppProcesses(), UsageStatsManager, and the AndroidProcesses library—to reduce startup latency and manage running processes across different Android versions.
This article explains the major challenges tackled by the Aura Android plugin framework—including component representation, class loading, resource handling, host‑plugin interaction, and packaging—and outlines how solving these enables building a generic, scalable plugin architecture for mobile apps.
Code Arbiter extends the FindBugs plugin to provide real‑time Android Studio source‑code security scanning, implementing line‑by‑line API misuse detection, empty TrustManager checks, taint‑analysis of sources and sinks, and custom bytecode checks for unprotected Intent/Bundle reads, all packaged as a JAR for instant developer feedback.
VasSonic, a lightweight high‑performance hybrid framework developed by Tencent’s VAS team, evolved from addressing slow H5 page loads in Mobile QQ to implementing terminal optimizations, static and dynamic rendering, parallel loading, and incremental updates, ultimately cutting first‑screen load time by more than 40%.
This article explains the design and implementation of Permissions4M, an Android library that uses compile‑time annotations to simplify runtime permission handling, covering the pre‑compilation, compilation, and post‑compilation stages, module structure, key code snippets, and usage patterns.
