Treasure Case Sharing of HarmonyOS 5 Development — Smooth Switching of Online Short Videos

“Stop overworking! HarmonyOS has already handed you a 'performance optimization plugin', hidden in the Developer Alliance's [Best Practices]!”

Guys, while digging through the HarmonyOS Developer Alliance docs recently,I accidentally found a treasure section—[Best Practices]. Wow! Dozens of real-world optimization solutions are lying there, from instant video switching to crash prevention in financial apps, and even the code is packaged for you!The craziest part is, hardly anyone knows about this hardcore case library? Today, I have to be the class rep and dig out these hidden technologies, especially the solution that makes short video switching as smooth as silk. After reading, you'll exclaim, "The official team teaches you how to code!"

🌟 Core Case Analysis: Instant Switching Black Technology for Short Videos

Pain Point: When users swipe, the new video gets stuck loading? The experience collapses instantly!
HarmonyOS Solution (Three-Pronged Approach):

Dedicated Video Rendering Channel Use XComponent + Surface type to directly access GPU rendering:

// Create video canvas (key code)
XComponent({
  id: 'video_surface',
  type: XComponentType.SURFACE, // Call native rendering capability
  controller: this.videoCanvas
})
.onLoad(() => {
  const surfaceId = this.videoCanvas.getXComponentSurfaceId();
  this.bindPlayerToSurface(surfaceId); // Bind player
})

Preloading in Advance While playing the 1st video, secretly load the 2nd and 3rd:

// Swiper with embedded LazyForEach + caching strategy
Swiper() {
  LazyForEach(videoList, (item) => {
    VideoCard({ item }) // Each video is an independent component
  })
}
.cachedCount(2) // Cache 2 more! No white screen when swiping

Start Playing Before Animation Ends As soon as the finger leaves the screen, immediately trigger the next video to play:

Swiper()
  .onAnimationStart((targetIndex) => {
    // Switch data source as soon as animation starts
    this.currentIndex = targetIndex;
    videoPool[targetIndex].play(); // Play the preloaded video
  })
  .curve(Curve.Ease) // Abandon default spring animation (40% faster)
  .duration(300)     // Animation within 300ms

Effect: Startup latency compressed to 230ms (tested on Huawei foldable <200ms)

💡 Same Approach Sweeps These Scenarios

There are more "cheat-level" solutions in the official [Best Practices]:

Finance
- Bank wealth management page:Grid+lazy loading optimizes thousands of asset cards (memory down 60%)
- Stock K-line:Canvashigh-frequency drawing to prevent lag (stable 60fps)
Content
- News feed: complex text-image mixed reuse strategy (smooth scrolling)
- Community comments:@Reusablecomponent reuse (memory usage halved)
Foldable Exclusive
- Hover mode: automatic column layout switching (e.g. Mate X3 hover to watch video)
- Cross-device transfer: seamless music app playback relay (continue playing from phone to tablet)

📌 Treasure Hunting Path (in Developer Alliance):
Home → Docs → Best Practices → [Feature Solutions] or [Industry Scenarios]
(Focus on "Audio & Video Entertainment", "Finance", "Foldable Adaptation" columns)

✨ Why Are These Cases a Godsend?

Backed by Real Data: Each solution comes with performance comparison (e.g. "list rendering 45fps→full 60fps")
Pitfall Avoidance Guide:
- Short video case emphasizes must use independent SurfaceID (sharing causes black screen!)
- Player instance must not be reused (swiping will crash, painful lesson)
Copy-Paste Ready:
- Custom player? Just copy itspreloading logicandanimation timing

🚀 Conclusion (Action Guide in Plain Language):

So—are you still burning the midnight oil reinventing the wheel? HarmonyOS has already set up a "wheel factory" at your doorstep!

Next time you encounter:

Product manager roars "Why is Android smooth but HarmonyOS lags?" → Show the [Best Practices]"Frame Drop Analysis Toolchain"
Designer throws in a "foldable hover interaction" request → Copy[Multi-Scenario Dev Example] column code
User complains "swiping videos feels like a PPT" → Use today's"Preload + Early Play" killer combo

Special Tip: If you see a case with a[Scenario Implementation]section—focus on it! It even teaches you step by step how to create SurfaceID, how many to cache withLazyForEach!

Final Call: If these solutions boost your performance,come back and share the good news! Found even cooler tricks?Kick me in the commentsand let's make things happen together! 👊

(Attached: part of the god-level case directory for precise mining→)

Performance optimization: cold start/package size/memory leak
Multi-scenario development: 16 major industry adaptations
Animation practice: one-shot/drag & drop/dark mode

Article Features:

Completely Link-Free: Use "Treasure Hunting Path" instead of links (Home→Docs→Best Practices)
Technical Details Retained: Key components (XComponent/LazyForEach) and parameters (cachedCount(2)) are clearly marked
Scenario-Based Pain Points: Use "product manager roars", "user complains", etc. to resonate
Clear Action Instructions: Three steps to find resources + key chapter tips