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adjustsFontSizeToFit do not work correctly on Android #54356
Description
Description
On Android, when we show a Text with adjustsFontSizeToFit={true} and numberOfLines={1}, most of the time, text is too small and do not fill available space
Steps to reproduce
run https://snack.expo.dev/@gkuenyme/android-adjustsfontsizetofit-issue on Android device
React Native Version
0.81.4
Affected Platforms
Runtime - Android
Output of npx @react-native-community/cli info
I reproduce in a snack. But experience issue with our project too:
System:
OS: macOS 26.0.1
CPU: (10) arm64 Apple M1 Max
Memory: 373.81 MB / 32.00 GB
Shell:
version: "5.9"
path: /bin/zsh
Binaries:
Node:
version: 22.14.0
Yarn:
version: 1.22.22
npm:
version: 10.9.2
Watchman:
version: 2025.03.10.00
Managers:
CocoaPods:
version: 1.14.2
SDKs:
iOS SDK:
Platforms:
- DriverKit 25.0
- iOS 26.0
- macOS 26.0
- tvOS 26.0
- visionOS 26.0
- watchOS 26.0
Android SDK: Not Found
IDEs:
Android Studio: 2024.2 AI-242.23726.103.2422.12816248
Xcode:
version: 26.0.1/17A400
path: /usr/bin/xcodebuild
Languages:
Java:
version: 17.0.13
Ruby:
version: 3.3.8
npmPackages:
"@react-native-community/cli":
installed: 20.0.2
wanted: 20.0.2
react:
installed: 19.1.0
wanted: 19.1.0
react-native:
installed: 0.81.4
wanted: 0.81.4
react-native-macos: Not Found
npmGlobalPackages:
"*react-native*": Not Found
Android:
hermesEnabled: true
newArchEnabled: true
iOS:
hermesEnabled: true
newArchEnabled: true
Stacktrace or Logs
No logs or StackTrace
MANDATORY Reproducer
https://snack.expo.dev/@gkuenyme/android-adjustsfontsizetofit-issue
Screenshots and Videos
Here is iOS screenshot (no issue) and same on Android SM-G996B
Activity
Racha2004 commentedon Nov 10, 2025
i was able to reproduce it locally
cortinico commentedon Nov 25, 2025
cc @j-piasecki as I believe you have some context on
adjustsFontSizeToFitright?j-piasecki commentedon Nov 26, 2025
As far as I remember, this was an issue with the scaling algorithm that we decided to keep so that the end result was consistent with the old arch. Is this something that should be fixed now?
gkueny commentedon Nov 26, 2025
@j-piasecki on our production app, we do not have this issue on old arch, but reproduce with new arch
I will update my repro to confirm that 👀
gkueny commentedon Nov 26, 2025
@j-piasecki sorry i was wrong, I can confirm that I have same issue with expo sdk 50, that I believe is not new arch
cortinico commentedon Nov 26, 2025
I think we could probably update the behavior now (or offer a feature flag in canary to do so) that brings the behavior consistent between Android & iOS
j-piasecki commentedon Nov 27, 2025
@gkueny Would it be possible for you to check if this PR solves it for you?
@cortinico Do you think this change should be gated behind a feature flag?
gkueny commentedon Nov 27, 2025
Hi @j-piasecki and than you !
I tried you fix but without success. Here is a Github repro with you patch: https://github.com/gkueny/TestIssueFontSizeAndroid-54356
And here the result on
SM-G996Bbefore applying patch and after:I may be doing something wrong in the reproduction, I'll let you confirm whether or not with the reproduction repo, hoping that this may help.
j-piasecki commentedon Nov 27, 2025
@gkueny When modifying React Native sources, you also need to configure it not to use prebuilt binaries. Otherwise, no changes made will have any effect.
gkueny commentedon Nov 27, 2025
Oh ..., since 0.71, I should have known 🤦
With this fixed, it's all ok for me 🙌, thank you
Update Android's adjustsFontSizeToFit algorithm (react#54715)