com.unity.uiwidgets/Samples/UIWidgetsSamples_2019_4/Assets/Script/ImageTest.cs

using System.Collections.Generic;
using Unity.UIWidgets.engine;
using Unity.UIWidgets.foundation;
using Unity.UIWidgets.painting;
using Unity.UIWidgets.ui;
using Unity.UIWidgets.widgets;
using Image = Unity.UIWidgets.widgets.Image;
using ui_ = Unity.UIWidgets.widgets.ui_;

namespace UIWidgetsSample
{
    public class ImageTest : UIWidgetsPanel
    {
        protected override void main()
        {
            ui_.runApp(new MyApp());
        }

        class MyApp : StatelessWidget
        {
            public override Widget build(BuildContext context)
            {
                return new WidgetsApp(
                    color: Color.white,
                    home: new ExampleApp(),
                    pageRouteBuilder: (settings, builder) =>
                        new PageRouteBuilder(
                            settings: settings,
                            pageBuilder: (Buildcontext, animation, secondaryAnimation) => builder(context)
                        )
                );
            }
        }

        class ExampleApp : StatefulWidget
        {
            public ExampleApp(Key key = null) : base(key)
            {
            }

            public override State createState()
            {
                return new ExampleState();
            }
        }

        class ExampleState : State<ExampleApp>
        {
            public override Widget build(BuildContext context)
            {
                return new Container(
                    child: new Column(
                        children: new List<Widget>
                        {
                            new Lottie("wine.json", size: new Size(100, 100)),
                            new Container(
                                width: 100,
                                height: 100,
                                decoration: new BoxDecoration(
                                    borderRadius: BorderRadius.all(Radius.circular(8))
                                ),
                                child: Image.file("test.gif", gaplessPlayback: true)
                            ),
                            new Container(
                                width: 200,
                                height: 100,
                                decoration: new BoxDecoration(
                                    borderRadius: BorderRadius.all(Radius.circular(8))
                                ),
                                child: Image.network(
                                    "https://unity-cn-cms-prd-1254078910.cos.ap-shanghai.myqcloud.com/assetstore-cms-media/img-7dfe215f-0075-4f9c-9b5a-be5ee88b866b",
                                    gaplessPlayback: true)
                            )
                        }
                    )
                );
            }
        }
    }
}