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iOS11

Android7.0

１．PCLの記述方法

namespace AppName.Services
{
    //DependencyServiceから利用する
    public interface IVideoService
    {
        void Play(string filePath);
    }
}

２．Androidの実装方法

using System;
using Android.App;
using Android.Views;
using Android.Widget;
using Xamarin.Forms;
using AppName.Droid.Services;
using AppName.Services;
[assembly: Dependency(typeof(VideoService))]
namespace AppName.Droid.Services
{
    public class VideoService: IVideoService
    {
        private static VideoView _view = null;
        //再生
        public void Play(string filePath)
        {
            if (String.IsNullOrEmpty(filePath))
            {
                return;
            }

            var context = Forms.Context;
            if (_view == null)
            {
                _view = new VideoView(Forms.Context);                
                ((Activity)context).AddContentView(_view, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MatchParent, ViewGroup.LayoutParams.MatchParent));
                Android.Net.Uri uri = null;
                if (!filePath.Contains("/"))
                {
                    var packageName = context.PackageManager.GetPackageInfo(context.PackageName, 0).PackageName;
                    //var resourceId = Resource.Raw.test;   /* /Resources/raw/test.mp4を指す */
                    var resourceId = (int)(typeof(Resource.Raw).GetField(System.IO.Path.GetFileNameWithoutExtension(filePath)).GetValue(null));

                    //リソースから取得する場合
                    uri = Android.Net.Uri.Parse(String.Format("android.resource://{0}/{1}",
                                                                packageName,
                                                                resourceId));
               }
                else
                {
                    //ファイルパスから取得する場合
                    uri = Android.Net.Uri.Parse(filePath);
                }
                _view.SetVideoURI(uri);
            }
            _view.Start();

            //再生できない場合
            _view.Error += async (s, e) =>
            {
                await Task.Delay(3000);
                this.DisposeObject();
            };

            //再生準備ができた場合
            _view.Prepared += (s, e) =>
            {
            };

            //再生が完了した場合
            _view.Completion += (s, e) =>
            {
                this.DisposeObject();
            };
        }

        private void DisposeObject()
        {
            ((ViewGroup)(_view.Parent)).RemoveView(_view);
            _view.Dispose();
            _view = null;
        }
    }
}

３．iOSの実装方法

using System;
using System.IO;
using Foundation;
using UIKit;
using AVFoundation;
using AVKit;
using CoreGraphics;
using Xamarin.Forms;
using AppName.iOS.Services;
using AppName.Services;
[assembly: Dependency(typeof(VideoService))]
namespace AppName.iOS.Services
{
    public class VideoService : IVideoService
    {
        //再生
        public void Play(string filePath)
        {
            if (String.IsNullOrEmpty(filePath))
            {
                return;
            }
            
            if (!filePath.Contains("/"))
            {
                //リソースから取得する場合
                filePath = NSBundle.MainBundle.PathForResource(
                                        Path.GetFileNameWithoutExtension(filePath),
                                        Path.GetExtension(filePath));
            }
            var url = NSUrl.FromFilename(filePath);
            //url = NSUrl.FromString("https://www.youtube.com/watch?v=O2NLJhHhA2g");
            var avpvc = new VideoController(url);
            
            var viewController = UIApplication.SharedApplication.KeyWindow.RootViewController;
            while (viewController.PresentedViewController != null)
            {
                viewController = viewController.PresentedViewController;
            }
            viewController.PresentViewController(avpvc, true, () =>
            {
                avpvc.Play();
            });
        }
    }

    public class VideoController : UIViewController
    {
        private NSUrl _url = null;
        private AVPlayer _avp = null;

        public VideoController(NSUrl url) : base()
        {
            _url = url;
        }

        public override void ViewDidLoad()
        {
            base.ViewDidLoad();

            var item = new AVPlayerItem(_url);
            _avp = new AVPlayer(item);

            var avpvc = new AVPlayerViewController();
            avpvc.Player = _avp;
            avpvc.View.Frame = new CGRect(0, 0, this.View.Bounds.Size.Width, this.View.Bounds.Size.Height);
            this.AddChildViewController(avpvc);
            this.View.AddSubview(avpvc.View);

            //AVPlayerLayerでも動作しました。
            //var playerLayer = AVPlayerLayer.FromPlayer(avp);
            //playerLayer.Frame = View.Frame;
            //View.Layer.AddSublayer(playerLayer);
        }
        public override bool ShouldAutorotateToInterfaceOrientation(UIInterfaceOrientation toInterfaceOrientation)
        {
            // Return true for supported orientations
            return (toInterfaceOrientation != UIInterfaceOrientation.PortraitUpsideDown);
        }

        public void Play()
        {
            if (_avp != null)
            {
                _avp.Play();
            }
        }
    }
}

４．使用方法

using AppName.Services;
using Xamarin.Forms;
public class TestPage : ContentPage
{
    void OnPlayClick(object sender, EventArgs e)
    {
        DependencyService.Get<IVideoService>().Play("test.mp4");
    }
}