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陈杨
陈杨

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Treasure Case Sharing of HarmonyOS 5 Development — One-to-Many Development Example (Games)

🌟[A Must-Read for Developers] HarmonyOS Hidden Treasure Chest Revealed! These Practical Cases Will Double Your Development Efficiency!

Hello, fellow developers! Today, I want to share an amazing discovery—HarmonyOS has already prepared tons of high-quality development cases for us! (It’s like finding cash hidden in your closet for ten years!) These "martial arts manuals" hidden deep in the docs can help you easily implement distributed games and cross-device collaboration—features that sound super cool. Hop on, and let me show you the right way to unlock HarmonyOS development!

1. Distributed Game Controller: Use Your Phone to Control TV Games

(Document Location: Device Collaboration > Game Scenario Cases)

A friend working on motion-sensing games recently complained: "It took me half a month just to debug using my phone as a game controller!" I immediately handed him this case—HarmonyOS uses the Distributed Soft Bus to discover devices in just three lines of code!

// Core code example
import distributedDeviceManager from '@ohos.distributedDeviceManager';
// 1. Discover nearby devices
deviceManager.discoverDevices()
// 2. Filter out large-screen devices
filterDeviceByType('smartTV') 
// 3. Establish a virtual controller channel
createVirtualControllerChannel()
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Even better, the case includes a gesture mapping solution: converting phone gyroscope data into directional key events, making even heavy games like "Harmony Contra" run smoothly. Tested latency is <50ms, even more stable than some Bluetooth controllers!

2. Cross-Device Pet Catching: Black Technology for Multi-Device Data Sync

(Document Location: Data Management > Game Progress Sync)

Last week, a team working on AR pet-raising asked me: "What if users lose all their pet data after switching phones?" HarmonyOS’s Distributed Data Object is tailor-made for this scenario!

The case achieves seamless sync through three key steps:

  1. Define a shared data model (pet attributes + growth value)
  2. Set up an auto-sync strategy (instant sync on WiFi / smart sync on 4G based on battery)
  3. Conflict resolution (last operation wins + version number check)

What impressed me most is their offline resume design: after 30 minutes offline in the subway, feeding records on both devices automatically merged when reconnected! There’s even a data encryption solution to prevent pet "account theft"~

3. 3D Particle Effects: Performance Optimization in Practice

(Document Location: Graphics Rendering > Game Engine Adaptation)

Countless people have asked: "How to run 3D effects on mid- and low-end devices?" The official case pulls out all the stops! Using RenderService, they achieved:

  • Intelligent particle count scaling (100K particles on flagships / 30K on budget phones)
  • Dynamic frame rate reduction (battle scenes locked at 60fps, cutscenes at 30fps)
  • Memory recycling strategy (automatically releases previous level resources when switching scenes)

The attached performance comparison data blew my mind: a domestic budget phone running fire effects saw memory usage drop from 1.2GB to 600MB, and frame rate fluctuation reduced from ±15fps to ±3fps!

4. Easter Egg: Creative Uses of Card Services

(Document Location: Meta Services > Game Scenarios)

Think cards can only show weather? The case uses ArkTS Cards for these cool tricks:

  • Real-time battle floating window (MOBA-style mini-map)
  • Offline idle countdown (shows remaining time even on lock screen)
  • Friend activity waterfall (swipe to view player albums)

Even crazier, a team used this case to create a "Cyber Farm" theft reminder card in just three days, boosting daily active users by 300%!

5. Pitfall Avoidance Guide: How to Read the Docs Properly

  1. Search "bpta" in the Developer Alliance APP for direct access to the case collection
  2. Use the TODO tags in the demo to quickly locate key code
  3. Focus on the issue section! Many tricky problems have already been answered by the official team (For example, the webgl black screen issue—turns out you need to disable dark mode adaptation)

Feeling excited? Open your computer now, I’ll be waiting for you in the HarmonyOS open source community for a battle! If you find any treasure cases, remember to share them in the comments~ Next time, I plan to dig into the hidden APIs in the docs. Want to see it? Type 1 in the comments!

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