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陈杨
陈杨

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Hong Mong 5 Development Case Sharing Reveals Multiple Development Examples Business Office

🌟[HarmonyOS Development Treasure Case Revealed] So many great things are hidden in the official documentation!

Hello everyone~ Recently, while working on a HarmonyOS project, I accidentally discovered a "treasure trove" in the official documentation! It turns out that the official team has already prepared reference solutions for those hair-pulling cross-device adaptation problems! Today, I’ll take you through these practical cases and teach you step by step how to master "develop once, deploy everywhere"! (There’s a surprise tip at the end~)

🚀 1. Business Office Application Case (Official Top Template)

👉 Case Highlights:

This template directly solves three major pain points—sidebar adaptation, split layout switching, and multi-device card arrangement. Even Huawei engineers use this solution!

✨ Practical Skill Breakdown:

  1. Smart Sidebar (Memo Module) 
// Automatically switch between embedded/overlay mode based on screen size
SideBarContainer(
  breakPoint === 'lg' ? SideBarContainerType.Embed : SideBarContainerType.Overlay
)
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📱Mobile → Floating sidebar | 💻Tablet → Embedded sidebar, as smooth as Dove chocolate!

  1. Dynamic Split Layout Magic (Calendar Module) 
// Smart switch between single and double columns
Navigation.mode = breakPoint === 'sm' ? NavigationMode.Stack : NavigationMode.Split
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Mobile portrait → Single column stack | Landscape/Tablet → Dual column parallel, I’d give this interaction logic 101 points!

  1. Grid Card Magic (Notes Summary Page) 
Grid() {
  ForEach(notes, item => NoteCard(item))
}.columnsTemplate('1fr 1fr 1fr') // Three-column auto-adapt
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From mobile to foldable screens, cards automatically adjust the number of columns—perfection for OCD!

🎮 2. Banking & Finance Application (Hidden Level)

👉 Case Highlights:

A model for handling complex financial data displays, the official demo shows how to elegantly present numerical charts across multiple devices.

💡 Pro Tips:

// Adaptive yield curve
LineChart()
  .aspectRatio(breakPoint === 'sm' ? 1.5 : 2.3)
// Dynamic layout for product list
GridItem({ span: { xs: 12, sm: 6, md: 4 } })
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Mobile → Vertical list | Tablet → Matrix layout, data visualization is maxed out!

🎥 3. Long Video Application (Player Adaptation Secrets)

👉 Case Highlights:

Solves the adaptation hell of video players, even considering PC mouse hover effects!

🎬 Practical Code Snippet:

VideoPlayer()
  .controlsVisible(hoverStatus || breakPoint === 'sm') // Persistent controls on mobile
  .aspectRatio(breakPoint === 'md' ? 16/9 : 21/9)
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Automatically switches aspect ratio between portrait and landscape, and adjusts the position of bullet comments—an experience rivaling top video sites!

🛠️ 4. Developer Cheatsheet (Hidden Tips)

  1. Breakpoint Listener Tool: 
// Device detection in three lines of code
const breakPoint = useBreakpoint()
const isFoldable = useFoldableState()
const orientation = useOrientation()
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  1. Multi-device Debugging Tricks: Open multiple Previewers in DevEco Studio at the same time, hold Alt and drag components to instantly see rendering effects on different screen sizes!
  2. Pitfall Avoidance Guide: Be sure to add this on PC! 
// Hide system title bar
window.setWindowDecorVisible(false)
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🌈 Conclusion

Do these cases make you feel like you’ve found a new path? Actually, the HarmonyOS docs hide 20+ industry solutions, covering everything from smart home to in-car systems. I recommend searching [One-for-Many Development Examples] on the official website—you’ll open the door to a new world!

Finally, here’s a saying for you: "Studying one official case in depth is better than reading ten blogs". These battle-tested codes are the real "golden anti-pit"! If you find other treasure cases, feel free to share them in the comments! 🙌

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