【Android】When the finger appears to be stationary, the touchmove event is triggered multiple times.

[yandadaFreedom]

Description

In my case, When the finger appears to be stationary, the touchmove event is triggered multiple times. Printing event.nativeEvent shows that the changedTouches and touches values for locationX, locationY, pageX, and pageY do not change, yet the move event is still triggered.

I cannot reproduce the issue in the emulator; it only occurs on a real device. The device I'm using for reproduction is an Oppo Reno8.

Steps to reproduce

1. Install the app
2. trigger event in pink area

React Native Version

0.80.1

Affected Platforms

Runtime - Android

Output of npx @react-native-community/cli info

System:
  OS: macOS 14.2.1
  CPU: (8) arm64 Apple M3
  Memory: 139.28 MB / 16.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 23.10.0
    path: ~/.nvm/versions/node/v23.10.0/bin/node
  Yarn:
    version: 1.22.22
    path: /usr/local/bin/yarn
  npm:
    version: 10.9.2
    path: ~/.nvm/versions/node/v23.10.0/bin/npm
  Watchman:
    version: 2024.10.21.00
    path: /usr/local/bin/watchman
Managers:
  CocoaPods:
    version: 1.15.2
    path: /usr/local/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 23.4
      - iOS 17.4
      - macOS 14.4
      - tvOS 17.4
      - visionOS 1.1
      - watchOS 10.4
  Android SDK: Not Found
IDEs:
  Android Studio: 2023.3 AI-233.14808.21.2331.11709847
  Xcode:
    version: 15.3/15E204a
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.11
    path: /usr/bin/javac
  Ruby:
    version: 3.1.0
    path: /Users/didi/.rbenv/shims/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 19.0.0
    wanted: 19.0.0
  react:
    installed: 19.1.0
    wanted: 19.1.0
  react-native:
    installed: 0.80.1
    wanted: 0.80.1
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: true
  newArchEnabled: true

Stacktrace or Logs

(NOBRIDGE) LOG  Touch Start: {"changedTouches": [{"identifier": 0, "locationX": 132.9166717529297, "locationY": 412.3333435058594, "pageX": 132.9166717529297, "pageY": 462.3333435058594, "target": 26, "targetSurface": 391, "timestamp": 8133981}], "identifier": 0, "locationX": 132.9166717529297, "locationY": 412.3333435058594, "pageX": 132.9166717529297, "pageY": 462.3333435058594, "target": 26, "targetSurface": 391, "timestamp": 8133981, "touches": [{"identifier": 0, "locationX": 132.9166717529297, "locationY": 412.3333435058594, "pageX": 132.9166717529297, "pageY": 462.3333435058594, "target": 26, "targetSurface": 391, "timestamp": 8133981}]}

 (NOBRIDGE) LOG  Touch Move: {"changedTouches": [{"identifier": 0, "locationX": 132.9166717529297, "locationY": 412.3333435058594, "pageX": 132.9166717529297, "pageY": 462.3333435058594, "target": 26, "targetSurface": 391, "timestamp": 8134190}], "identifier": 0, "locationX": 132.9166717529297, "locationY": 412.3333435058594, "pageX": 132.9166717529297, "pageY": 462.3333435058594, "target": 26, "targetSurface": 391, "timestamp": 8134190, "touches": [{"identifier": 0, "locationX": 132.9166717529297, "locationY": 412.3333435058594, "pageX": 132.9166717529297, "pageY": 462.3333435058594, "target": 26, "targetSurface": 391, "timestamp": 8134190}]}

 (NOBRIDGE) LOG  Touch Move: {"changedTouches": [{"identifier": 0, "locationX": 132.9166717529297, "locationY": 412.3333435058594, "pageX": 132.9166717529297, "pageY": 462.3333435058594, "target": 26, "targetSurface": 391, "timestamp": 8134901}], "identifier": 0, "locationX": 132.9166717529297, "locationY": 412.3333435058594, "pageX": 132.9166717529297, "pageY": 462.3333435058594, "target": 26, "targetSurface": 391, "timestamp": 8134901, "touches": [{"identifier": 0, "locationX": 132.9166717529297, "locationY": 412.3333435058594, "pageX": 132.9166717529297, "pageY": 462.3333435058594, "target": 26, "targetSurface": 391, "timestamp": 8134901}]}

 (NOBRIDGE) LOG  Touch End: {"changedTouches": [{"identifier": 0, "locationX": 132.9166717529297, "locationY": 412.3333435058594, "pageX": 132.9166717529297, "pageY": 462.3333435058594, "target": 26, "targetSurface": 391, "timestamp": 8134914}], "identifier": 0, "locationX": 132.9166717529297, "locationY": 412.3333435058594, "pageX": 132.9166717529297, "pageY": 462.3333435058594, "target": 26, "targetSurface": 391, "timestamp": 8134914, "touches": []}

MANDATORY Reproducer

https://github.com/yandadaFreedom/reproducer-react-native-0.80.1/tree/bug-android-touchmove

Screenshots and Videos

[cortinico]

I cannot reproduce the issue in the emulator; it only occurs on a real device. The device I'm using for reproduction is an Oppo Reno8.

This generally happens because your device is recording little movements of the finger. Even if it "appears stationary", the touch screens are extremely sensible and can detect really small movements.

This also explains why it's harder to reproduce on emulator (where you have a cursor)