react / react/react-native

(Android 9) Flatlist header shows up underneath items if items have elevation: 1 or higher; can't be fixed with zindex.

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Component: FlatList Needs: Triage :mag: Platform: Android
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描述

Description

Flatlist ListHeaderComponent together with stickyHeaderIndices={[0]} shows up under items when scrolling, if items have elevation 1 or higher. Seems to only show up on my older device (Android 9), I've tried to fix this with both zIndex and elevation on the header component (also with ListHeaderComponentStyle) but nothing changes.

Steps to reproduce
  1. open the provided snack with an older device (Android 9), I can't test Android 10 at the moment but when using Android 11 or higher the issue doesn't show up.
  2. scroll the FlatList
  3. observe header component
React Native Version

0.76.6

Affected Platforms

Runtime - Android

Output of npx react-native info
System:
  OS: Windows 10
  Memory: 4.22 GB / 15.9 GB
Binaries:
  Node:
    version: 20.11.0
    path: ~\node_modules\.bin\node.CMD
  Yarn: Not Found
  npm:
    version: 11.0.0
    path: ~\project\node_modules\.bin\npm.CMD
  Watchman: Not Found
SDKs:
  Android SDK:
    API Levels:
      - "33"
      - "35"
    Build Tools:
      - 33.0.1
      - 34.0.0
      - 35.0.0
    System Images: Not Found
    Android NDK: Not Found
  Windows SDK: Not Found
IDEs:
  Android Studio: AI-241.18034.62.2412.12266719
  Visual Studio:
    - 17.9.34728.123 (Visual Studio Community 2022)
Languages:
  Java: 17.0.13
  Ruby: Not Found
npmPackages:
  "@react-native-community/cli":
    installed: 15.1.3
    wanted: ^15.1.3
  react:
    installed: 18.3.1
    wanted: 18.3.1
  react-native:
    installed: 0.76.6
    wanted: 0.76.6
  react-native-windows: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: Not found
  newArchEnabled: Not found
iOS:
  hermesEnabled: Not found
  newArchEnabled: Not found
Stacktrace or Logs
no stacktrace.
Reproducer

https://snack.expo.dev/@0xirakli/lonely-blue-cake?platform=android

Screenshots and Videos

Image

Image

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  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

调研方向

首先,在 Android 9 上使用 React Native 0.76.6、FlatList、stickyHeaderIndices={[0]} 和具有 elevation 的项目复现链接的 Snack;将其行为与 Android 11 或更高版本进行比较。跟踪 Android 对 sticky header 和项目 elevation 的处理,并在受影响的 Android 版本上滚动时 header 始终位于具有 elevation 的项目上方后,将该 issue 视为完成。

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评估

技术栈
android, react-native
领域
mobile-dev
Issue 类型
缺陷
难度
4/5
预计耗时
3-5 天
活跃度
冷清
描述清晰度
基本清楚
新手友好度
48/100

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