react / react/react-native

Fontsize changing only once with systems settings in Android 15

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Issue: Author Provided Repro Platform: Android
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描述

Description

When changing the sytems fontsize a react native application in Android does not change the fontsize until it is restarted, in Android versions <=14 it is rerendered in the new fontsize on the fly.

Steps to reproduce
  1. create new project from via npx @react-native-community/cli@latest init projectname and begin running it
  2. Use two android version for this test , particularly use Android 14 Pixel 8 , and another Android 15 Pixel 8
  3. start example app
  4. change fontsize at least two times -> Android 14 font resizes, Android 15 font stays the same

Android15 stays the same after changing fontSize:
Image
Android15 after restart with changed fontSize:
Image

Android14 before changing size:
Image
Android14 afterchanging size:
Image

Video showing only first fontSize change has effect until restarting App:

https://github.com/user-attachments/assets/42a4a157-6c72-4a99-aa9e-c315b9071adb

React Native Version

0.77.1 and before

Affected Platforms

Runtime - Android

Output of npx @react-native-community/cli info
System:
  OS: macOS 15.3.1
  CPU: (12) arm64 Apple M3 Pro
  Memory: 1.34 GB / 36.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 21.6.2
    path: ~/.nvm/versions/node/v21.6.2/bin/node
  Yarn:
    version: 1.22.21
    path: ~/.nvm/versions/node/v21.6.2/bin/yarn
  npm:
    version: 10.2.4
    path: ~/.nvm/versions/node/v21.6.2/bin/npm
  Watchman:
    version: 2024.12.02.00
    path: /opt/homebrew/bin/watchman
Managers:
  CocoaPods:
    version: 1.16.2
    path: /opt/homebrew/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 24.2
      - iOS 18.2
      - macOS 15.2
      - tvOS 18.2
      - visionOS 2.2
      - watchOS 11.2
  Android SDK:
    API Levels:
      - "33"
      - "34"
      - "35"
    Build Tools:
      - 30.0.3
      - 33.0.0
      - 33.0.1
      - 34.0.0
      - 35.0.0
    System Images:
      - android-34 | Google APIs ARM 64 v8a
      - android-35 | Google Play ARM 64 v8a
    Android NDK: Not Found
IDEs:
  Android Studio: 2024.2 AI-242.23726.103.2422.12816248
  Xcode:
    version: 16.2/16C5032a
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.10
    path: /Library/Java/JavaVirtualMachines/temurin-17.jdk/Contents/Home/bin/javac
  Ruby:
    version: 2.7.8
    path: /opt/homebrew/opt/ruby@2.7/bin/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 15.0.1
    wanted: 15.0.1
  react:
    installed: 18.3.1
    wanted: 18.3.1
  react-native:
    installed: 0.77.1
    wanted: 0.77.1
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: Not found
  newArchEnabled: false
Stacktrace or Logs
nothing
Reproducer

https://github.com/recumbentseeker/fontscale

Screenshots and Videos

No response

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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 14 和 Android 15 上运行链接的 fontscale reproducer,然后重复 issue 中描述的系统字体大小更改。比较应用重启前后的行为,并跟踪涉及的 Android runtime 处理。完成的标准是:字体大小更改能够继续更新 React Native 应用而无需重启,同时 Android 14 上的行为保持不变。

由索引模型根据 Issue 内容生成。

评估

技术栈
android
领域
mobile
Issue 类型
缺陷
难度
4/5
预计耗时
3-5 天
活跃度
停滞
描述清晰度
基本清楚
新手友好度
35/100

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