Focused on hardcore practical AI technologies (OpenClaw, ClaudeCode, LLMs, etc.) and HarmonyOS development. No hype—just real-world tips, pitfall chronicles, and productivity tools. Follow to transform workflows with code.
After receiving extensive feedback on a global grayscale hack that broke WebView and video playback, the author presents a cleaner, hardware‑accelerated solution using View.setLayerType with a Paint‑based ColorMatrix, explains its advantages, limitations, and when to apply it selectively.
This article explains how to apply a full‑screen grayscale effect to Android apps by using a single CSS rule for web pages and custom View subclasses—GrayImageView, GrayTextView, GrayLinearLayout, and GrayFrameLayout—plus an Activity onCreateView override to replace the root content view, complete with code snippets and practical tips.
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 debunks the common belief that match_parent and wrap_content always correspond to MeasureSpec.EXACTLY and MeasureSpec.AT_MOST, explains how a parent view's spec mode and LayoutParams together determine the final MeasureSpec, and shows when UNSPECIFIED actually appears in Android layouts.
This article explains the inner workings of Android’s GestureDetector class, detailing how it creates listeners, processes MotionEvent actions, schedules handler messages, and determines the timing and conditions for callbacks such as onDown, onShowPress, onSingleTapUp, onScroll, onLongPress, onFling, and double‑tap events.
This article explains Android's touch event dispatch mechanism, detailing MotionEvent actions, the roles of dispatchTouchEvent, onInterceptTouchEvent, and onTouchEvent, and demonstrates through code why onTouch executes before onClick and how returning true from onTouch consumes the click event.
This article walks through Android’s Activity.setContentView implementation, tracing how the framework creates a PhoneWindow, initializes a DecorView, selects the appropriate layout resource, inflates it, and finally attaches the view hierarchy to the activity’s content container.
This article introduces dynamic programming as an optimization technique from operations research, explains its fundamental concepts, optimality principle, no‑after‑effect property, and overlapping subproblems, outlines the typical problem‑model steps, and demonstrates a practical C++ implementation for solving the fractional knapsack problem.
This article explains what RemoteViews are, their use cases in notification bars and home‑screen widgets, provides step‑by‑step code for both scenarios, details PendingIntent handling, and dives deep into the internal cross‑process mechanisms that power RemoteViews updates.
This article explains why thread safety is essential in concurrent Java programs, introduces the lock concept, and provides detailed examples of using the synchronized keyword to protect code blocks, instance methods, static methods, and entire classes, including common pitfalls and inheritance rules.
