• I have reviewed the documentation
• I have searched existing issues
• I am using the latest React Native version

This is being reproduced with the latest Expo SDK version 25, which uses React Native 52. But I haven't seen any fixes in the changelog since that so I'm assuming it's still happening.

The momentum scroll on Android are firing before the momentum actually ends. Contrary to iOS, which behaves as it should.

Environment

Environment:
OS: macOS High Sierra 10.13.2
Node: 6.12.3
Yarn: 1.5.1
npm: 3.10.10
Watchman: 4.7.0
Xcode: Xcode 9.2 Build version 9C40b
Android Studio: 3.0 AI-171.4443003

Packages: (wanted => installed)
react: 16.2.0 => 16.2.0
react-native: https://github.com/expo/react-native/archive/sdk-25.0.0.tar.gz => 0.52.0

Steps to Reproduce

A snack to reproduce the issue: https://snack.expo.io/@abdallamohamed/onmomentumscroll-bug-on-android

Expected Behavior

Here's how it behaves on iOS:
During a momentum scroll, if you start another scroll:

1. An onScrollDragBegin is fired.
2. When the user lifts their finger, an onScrollDragEnd is fired.
3. An onMomentumScrollBegin is fired and the scrollview starts scrolling.
4. When it finally stops, an onMomentumScrollEnd is fired.

Actual Behavior

1. An onScrollDragBegin is fired.
2. When the user lifts their finger, an onScrollDragEnd is fired.
3. An onMomentumScrollBegin is fired, followed instantly by 2onMomentumScrollEnd events.
4. The scrollview keeps scrolling and it finally stops.