react / react/react-native

When the system font size changes, the text sizes in the application are not updated

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Description

Description

Please watch the video to understand the issue better.

import { View, Text, StatusBar } from "react-native";

export default function App() {
	return (
		<View style={{ flex: 1, justifyContent: "center", alignItems: "center" }}>
            <StatusBar animated={true} translucent={true} barStyle={"dark-content"} backgroundColor={"transparent"} />
			<Text style={{ fontSize: 14 }}>Hesap Defterim</Text>
		</View>
	);
}

https://github.com/user-attachments/assets/4254a949-f596-4e64-bf43-58f51fd3842c

Steps to reproduce

npx @react-native-community/cli@latest init TestProject --package-name com.test.project
npx react-native run-android

React Native Version

0.81.4

Affected Platforms

Runtime - Android

Output of npx @react-native-community/cli info
System:
  OS: Windows 11 10.0.26200
  CPU: "(24) x64 AMD Ryzen 9 7900X 12-Core Processor            "
  Memory: 12.94 GB / 31.60 GB
Binaries:
  Node:
    version: 24.9.0
    path: C:\Program Files\nodejs\node.EXE
  Yarn: Not Found
  npm:
    version: 11.6.0
    path: C:\Program Files\nodejs\npm.CMD
  Watchman: Not Found
SDKs:
  Android SDK:
    API Levels:
      - "36"
    Build Tools:
      - 35.0.0
      - 36.0.0
      - 36.1.0
    System Images:
      - android-36.1 | Google Play Intel x86_64 Atom
    Android NDK: Not Found
  Windows SDK: Not Found
IDEs:
  Android Studio: AI-251.26094.121.2513.14007798
  Visual Studio: Not Found
Languages:
  Java: 17.0.16
  Ruby: Not Found
npmPackages:
  "@react-native-community/cli":
    installed: 20.0.0
    wanted: 20.0.0
  react:
    installed: 19.1.0
    wanted: 19.1.0
  react-native:
    installed: 0.81.4
    wanted: 0.81.4
  react-native-windows: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: Not found
  newArchEnabled: Not found
Stacktrace or Logs
N/A
MANDATORY Reproducer

N/A

Screenshots and Videos

https://github.com/user-attachments/assets/4ca8e5d4-6564-41ea-aae8-4c76d6de93e3

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 minimal App component shown in the issue and reproduce it using the provided React Native CLI commands on Android. Change the system font size while the app is running and compare the Text rendering; done means the displayed text size updates to match the system setting.

Written by the indexing model from the issue text.

Assessment

Tech stack
android, react-native, typescript
Domain
mobile
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Active
Clarity
Mostly clear
Newbie friendliness
45/100

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