react / react/react-native

100% height does not match window height on some devices.

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#42,050 3 comments 1 reaction 0 assignees View on GitHub

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Issue: Author Provided Repro Needs: Triage :mag:
Dominant language
C++
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Avg merge
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Description

Description

The height obtained from useWindowDimensions() and the height provided by "onLayout" when the style is "height: 100%" is not consistent on some Android devices. I have specifically seen this on the Nexus 4 and Nexus 5X devices. When the same code runs on the Pixel 6, it provide consistent results out to many decimal places.

Steps to reproduce
  1. Clone this project: HeightBug (github) (based on the standard new tempate-- only App.tsx differs)
  2. Run it on a Pixel 6 (emulator, API 33). See that it reports similar numbers
  3. Run it on a Nexus 4 (emulator, API 33). See that it does dissimilar numbers (616, and 592 for me).
React Native Version

0.73.1

Affected Platforms

Runtime - Android

Output of npx react-native info
info Fetching system and libraries information...
System:
  OS: macOS 14.2
  CPU: (10) arm64 Apple M1 Max
  Memory: 79.38 MB / 64.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 18.16.1
    path: ~/.nvm/versions/node/v18.16.1/bin/node
  Yarn:
    version: 1.22.19
    path: ~/.nvm/versions/node/v18.16.1/bin/yarn
  npm:
    version: 9.5.1
    path: ~/.nvm/versions/node/v18.16.1/bin/npm
  Watchman:
    version: 2023.07.03.00
    path: /opt/homebrew/bin/watchman
Managers:
  CocoaPods:
    version: 1.12.0
    path: /opt/homebrew/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 23.0
      - iOS 17.0
      - macOS 14.0
      - tvOS 17.0
      - watchOS 10.0
  Android SDK:
    API Levels:
      - "29"
      - "33"
      - "34"
    Build Tools:
      - 29.0.2
      - 30.0.3
      - 33.0.0
      - 34.0.0
    System Images:
      - android-21 | Google APIs ARM 64 v8a
      - android-23 | ARM 64 v8a
      - android-33 | Google APIs ARM 64 v8a
      - android-33 | Google Play ARM 64 v8a
    Android NDK: Not Found
IDEs:
  Android Studio: Not Found
  Xcode:
    version: 15.0.1/15A507
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 20.0.1
    path: /Users/dcorbin/.jenv/shims/javac
  Ruby:
    version: 3.1.0
    path: /Users/dcorbin/.rbenv/shims/ruby
npmPackages:
  "@react-native-community/cli": Not Found
  react:
    installed: 18.2.0
    wanted: 18.2.0
  react-native:
    installed: 0.73.1
    wanted: 0.73.1
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: false
iOS:
  hermesEnabled: Not found
  newArchEnabled: false
Stacktrace or Logs
There is no crash.
Reproducer

https://github.com/dcorbin/rnHeightBug

Screenshots and Videos

Nexus4Api33

Pixel6API33

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the rnHeightBug reproducer and compare useWindowDimensions() with the onLayout result for a view styled with height: 100% on the Pixel 6 and Nexus 4 API 33 configurations. Review the React Native 0.73.1 Android layout behavior involved in those measurements. Done means the reported heights are consistent across the affected devices without changing the reproducer’s intended layout.

Written by the indexing model from the issue text.

Assessment

Tech stack
android, react-native
Domain
mobile-dev
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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