diff --git a/ReactAndroid/src/main/java/com/facebook/react/views/scroll/ReactScrollView.java b/ReactAndroid/src/main/java/com/facebook/react/views/scroll/ReactScrollView.java index e31a84e0576dc1..9106ad5eb744e0 100644 --- a/ReactAndroid/src/main/java/com/facebook/react/views/scroll/ReactScrollView.java +++ b/ReactAndroid/src/main/java/com/facebook/react/views/scroll/ReactScrollView.java @@ -299,6 +299,16 @@ public void getClippingRect(Rect outClippingRect) { @Override public void fling(int velocityY) { + // Workaround. + // On Android P if a ScrollView is inverted, we will get a wrong sign for + // velocityY (see https://issuetracker.google.com/issues/112385925). + // At the same time, mOnScrollDispatchHelper tracks the correct velocity direction. + // + // Hence, we can use the absolute value from whatever the OS gives + // us and use the sign of what mOnScrollDispatchHelper has tracked. + velocityY = (int)(Math.abs(velocityY) * Math.signum(mOnScrollDispatchHelper.getYFlingVelocity())); + + if (mPagingEnabled) { flingAndSnap(velocityY); } else if (mScroller != null) {