@Override
    public boolean dispatchNestedFling(float velocityX, float velocityY, boolean consumed) {
        return mChildHelper.dispatchNestedFling(velocityX, velocityY, consumed);
    }
Sentinel value for no current active pointer.
Used by {@link #mActivePointerId}.
app/src/main/java/home/smart/fly/animations/widget/NestedScrollView.java