51CTO HarmonyOS Developer Community

Aug 31, 2026 · Frontend Development

HarmonyOS 7 Floating Tabs: Window-Width-Driven Layouts for Foldables & Tablets

This article demonstrates how to build responsive HarmonyOS 7 floating tab layouts that adapt to foldable phones, tablets, and split-screen windows by reading actual container width via ContainerReader, using breakpoints at 440/600/840 vp to switch column counts, preserving business state during layout changes, and avoiding device-type branching.