Xamarin Android ViewPager (Android.Support.V4.View) that allows for swiping between fragments even when a touch event lands initially on a child control.

InterceptingViewPager.cs

using System;
using Android.Content;
using Android.Support.V4.View;
using Android.Util;
using Android.Views;

namespace InterceptingViewPagerExample.Droid
{
    class InterceptingViewPager : ViewPager
    {
        private float _initialMotionX;
        private readonly int _scrollTouchSlop;

        public InterceptingViewPager(Context context, IAttributeSet attrs) : base(context, attrs)
        {
            var viewConfig = ViewConfiguration.Get(context);
            _scrollTouchSlop = viewConfig.ScaledTouchSlop;
        }

        
        public override bool OnInterceptTouchEvent(MotionEvent ev)
        {
            var motionX = ev.GetX();
            var motionChangeX = Math.Abs(_initialMotionX - motionX);

            if (ev.Action == MotionEventActions.Down)
            {
                _initialMotionX = motionX;
            }

            if (ev.Action == MotionEventActions.Move && motionChangeX > _scrollTouchSlop)
            {
                return true;
            }

            return base.OnInterceptTouchEvent(ev);
        }
    }
}