Core Insights - HarmonyOS, developed by Huawei, represents a significant shift in operating systems, emphasizing a distributed architecture that enables seamless interaction across devices [2][3] - The "Harmony Practical Development Series Courses" aim to provide developers with a systematic understanding of future interaction models and the skills necessary for creating innovative applications [2][8] Group 1: Understanding HarmonyOS - The first step in HarmonyOS development is a paradigm shift from single-device optimization to a "super terminal" mindset, focusing on distributed soft bus and atomic services [3] - Developers must grasp the philosophy behind "one-time development, multi-end deployment" to fully leverage the capabilities of HarmonyOS [3] Group 2: Foundational Skills - ArkTS, the primary programming language for HarmonyOS, is based on TypeScript and incorporates ArkUI's declarative UI paradigm, forming the foundation for application development [4] - Mastery of ArkTS language features, such as static typing and asynchronous concurrency, is crucial for building robust and maintainable applications [6] Group 3: Core Competencies - Practical exercises in the courses focus on distributed capabilities and hardware collaboration, allowing developers to experience the unique features of HarmonyOS [5][6] - Understanding atomic services enables developers to create lightweight, independent service units that enhance user experience through high-density information and convenient interactions [6] Group 4: Advanced Optimization - After establishing basic functionalities, developers are encouraged to focus on performance, user experience, and ecosystem integration [7] Group 5: Future Outlook - The Harmony ecosystem is rapidly evolving, and the courses aim to equip developers with the ability to adapt to new capabilities and hardware forms [8] - Developers will transition from being platform-specific to becoming experience designers and architects, capable of creating exceptional digital services that connect users and devices [8][9] Group 6: Cross-Device Collaboration - Developers will learn to manage distributed tasks and ensure seamless transitions between devices, enhancing user experience in tasks like video playback and document editing [10] - Understanding how to leverage hardware capabilities across devices will enable the creation of complex functionalities that a single device cannot achieve [10] Group 7: User Experience Design - Mastery of universal card development will enhance user engagement by providing rich information and quick actions at the application entry points [10] - Developers must also focus on performance optimization in distributed environments to ensure smooth collaborative experiences and device longevity [10]

Core Insights - The emergence of HarmonyOS represents China's significant advancement in mastering core operating system technologies, providing a foundation for domestic software development [1][3] - HarmonyOS has achieved a critical breakthrough with over 300,000 applications and services, and an ecosystem compatibility rate exceeding 95%, positioning itself as a third option alongside Android and iOS [3][12] - The ecosystem's growth is driven by a large number of small and medium developers who benefit from low entry barriers, high development efficiency, transparent incentive rules, and comprehensive support [3][4][5] Developer Ecosystem - HarmonyOS fosters a symbiotic relationship with developers by reducing their time and opportunity costs, creating a low-barrier innovation environment, and providing full-cycle support [4][5] - The platform offers low-code development tools and modular resources, enabling non-technical individuals to create applications easily [4][5] - Developers are encouraged by clear commercial return pathways and supportive policies, such as the "HarmonyOS Developer Incentive Plan 2025" [5][11] Success Stories - The "Orange Ledger" application exemplifies consumer application success, showcasing how developers can leverage HarmonyOS capabilities to create innovative solutions that meet user needs [6][10] - "Echat," a B2B SDK developed by Honghong Technology, illustrates HarmonyOS's potential in enterprise services, enabling seamless integration across multiple devices [7][9][10] Rapid Growth - HarmonyOS has seen rapid growth, with over 27 million devices running HarmonyOS 5 and 6, making it the fastest-growing operating system in smart device history [12] - The ecosystem has transitioned from basic compatibility to deep co-creation, with daily application downloads or updates reaching 8.8 million [12] - The relationship between HarmonyOS and developers has evolved into a community of mutual achievement, fostering innovation and personal development [12]