Is it possible to add another package of pub.dev to use it?

[pallenJ]

I'm curious how to do it if possible.
Thank you

[kuro7766]

Probably not.
As the document said,this package is not another copy of flutter. It has different implementations.

[pallenJ]

Thank you for answer.
By the way, I've been struggling with a Dialog issue for a week now. Could you please tell me what the problem is?

My source code

using Unity.UIWidgets.engine;
using Unity.UIWidgets.material;
using Unity.UIWidgets.painting;
using Unity.UIWidgets.ui;
using Unity.UIWidgets.widgets;
using UnityEngine;
using System;
using System.Collections.Generic;


public class GalleryEX : UIWidgetsPanel
{
    protected override Widget createWidget()
    {

        return new MyGallery(

            );
    }

    protected override void OnEnable()
    {
        FontManager.instance.addFont(Resources.Load<Font>("MaterialIcons-Regular"), "Material Icons");
        FontManager.instance.addFont(Resources.Load<Font>("GalleryIcons"), "GalleryIcons");

        FontManager.instance.addFont(Resources.Load<Font>("CupertinoIcons"), "CupertinoIcons");
        FontManager.instance.addFont(Resources.Load<Font>(path: "SF-Pro-Text-Regular"), ".SF Pro Text", FontWeight.w400);
        FontManager.instance.addFont(Resources.Load<Font>(path: "SF-Pro-Text-Semibold"), ".SF Pro Text", FontWeight.w600);
        FontManager.instance.addFont(Resources.Load<Font>(path: "SF-Pro-Text-Bold"), ".SF Pro Text", FontWeight.w700);

        base.OnEnable();
    }

}

class MyGallery : StatefulWidget
{

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

class _MyGalleryState : State<MyGallery>
{

    Unity.UIWidgets.ui.Color pColor = Colors.blueAccent;
    int _idx = 0;
    List<string> menuList = new List<string> { "메인", "측정일지", "메뉴", "커뮤니티", "프리미엄" };

    List<Widget> pageList = new List<Widget>
    {
         new ListView(
             padding: EdgeInsets.all(20)

                )
        ,
    };

    public override Widget build(BuildContext context)
    {
        TextStyle _normalSt = new TextStyle(color: Colors.grey);

        Widget home = new Scaffold(

            appBar: new AppBar(
                backgroundColor: pColor
                , title: new Text(menuList[_idx]
                , style: new TextStyle(color: Colors.white)

                    )
                , centerTitle: true
                , leading: new BackButton(color: Colors.white)
                , actions: new List<Widget>
                {
                   new IconButton(icon: new Icon(icon:Icons.menu, color:Colors.white))
                }
                )
            , body: new Column(
                children: new List<Widget>{

                  new RaisedButton(
                   child: new Text("Select Date"),
                   onPressed: ()=>{
                       Debug.Log("aaa");
                       /*Unity.UIWidgets.material.DialogUtils.showDialog(context:context , builder: (_context)=>
                       {
                           return  new AlertDialog(
                             actions: new List<Widget>
                                {
                                      new FlatButton(child: new Text("Close"),
                                        onPressed: ()=>{
                                            Navigator.pop(_context);
                                        }
                                      )
                                 }
                            );
                       }
                       );*/
                       /*DatePickerUtils.showDatePicker(
                       context:context,
                       initialDate:DateTime.Now,
                       firstDate:new DateTime(2020),
                       lastDate:new DateTime(2030),
                       selectableDayPredicate: _decideWhichDayToEnable
                        )*/;
                       Navigator.of(context);
                        Unity.UIWidgets.material.DialogUtils.showDialog(context:context, builder:(_context)=>{
                         return  new  AlertDialog();
                       }
                           
                           
                           ).Then((p)=>{Debug.Log("das"); });
                   }

                  )
                  

                 

                }

                )


     , bottomNavigationBar: new BottomNavigationBar(
         selectedItemColor: pColor,
         onTap: (index) =>
         {
             setState(() =>
             {
                 _idx = index;
                 Debug.Log(_idx);

             });

         }
         , currentIndex: _idx
         ,
         items:
         new List<BottomNavigationBarItem>()
         {
             new BottomNavigationBarItem(icon: new Icon(icon: Icons.home, color: Colors.grey) ,title: new Text("Home" , style: _normalSt), activeIcon:new Icon(icon: Icons.home, color: pColor)),
             new BottomNavigationBarItem(icon: new Icon(icon: Icons.book, color: Colors.grey) ,title: new Text("Diary" , style: _normalSt), activeIcon:new Icon(icon: Icons.book, color: pColor)),
             new BottomNavigationBarItem(icon: new Icon(icon: Icons.check, color: Colors.grey) ,title: new Text("Menu" , style: _normalSt), activeIcon:new Icon(icon: Icons.check, color: pColor)),
             new BottomNavigationBarItem(icon: new Icon(icon: Icons.sms, color: Colors.grey) ,title: new Text("SNS", style: _normalSt), activeIcon:new Icon(icon: Icons.sms, color: pColor)),
             new BottomNavigationBarItem(icon: new Icon(icon: Icons.chat, color: Colors.grey) ,title: new Text("Premium" , style: _normalSt), activeIcon:new Icon(icon: Icons.chat, color: pColor)),

         }
         // , type:BottomNavigationBarType.fix

         )
            );
        return new MaterialApp(
                home: home
        );
    }

    bool _decideWhichDayToEnable(DateTime day)
    {
        if ((day-DateTime.Now).TotalDays>0 &&
            (DateTime.Now-day).TotalDays>10)
        {
            return true;
        }
        return false;
    }


    public override void initState()
    {
        base.initState();
    }

    public override void dispose()
    {
        base.dispose();
    }



}

Error Message

AssertionError: Error caught by gesture, thrown while handling a gesture. Object reference not set to an instance of an object
Handler: onTap
Recognizer:
  Unity.UIWidgets.gestures.TapGestureRecognizer#E6C00
  at Unity.UIWidgets.widgets.DialogUtils.showGeneralDialog (Unity.UIWidgets.widgets.BuildContext context, Unity.UIWidgets.widgets.RoutePageBuilder pageBuilder, System.Boolean barrierDismissible, Unity.UIWidgets.ui.Color barrierColor, System.Nullable`1[T] transitionDuration, Unity.UIWidgets.widgets.RouteTransitionsBuilder transitionBuilder) [0x00001] in D:\study\App_Practice\Assets\UIWidgets\Runtime\widgets\routes.cs:822 
  at Unity.UIWidgets.material.DialogUtils.showDialog (Unity.UIWidgets.widgets.BuildContext context, System.Boolean barrierDismissible, Unity.UIWidgets.widgets.WidgetBuilder builder) [0x0001b] in D:\study\App_Practice\Assets\UIWidgets\Runtime\material\dialog.cs:296 
  at _MyGalleryState+<>c__DisplayClass4_0.<build>b__0 () [0x0001b] in D:\study\App_Practice\Assets\Script\GalleryEX.cs:114 
  at Unity.UIWidgets.material._RawMaterialButtonState.<build>b__3_0 () [0x00014] in D:\study\App_Practice\Assets\UIWidgets\Runtime\material\button.cs:148 
  at Unity.UIWidgets.material._InkResponseState`1[T]._handleTap (Unity.UIWidgets.widgets.BuildContext context) [0x0003a] in D:\study\App_Practice\Assets\UIWidgets\Runtime\material\ink_well.cs:282 
  at Unity.UIWidgets.material._InkResponseState`1+<>c__DisplayClass14_0[T].<build>b__0 () [0x00000] in D:\study\App_Practice\Assets\UIWidgets\Runtime\material\ink_well.cs:346 
  at Unity.UIWidgets.gestures.TapGestureRecognizer.<_checkUp>b__14_1 () [0x00001] in D:\study\App_Practice\Assets\UIWidgets\Runtime\gestures\tap.cs:132 
  at Unity.UIWidgets.gestures.GestureRecognizer.invokeCallback[T] (System.String name, Unity.UIWidgets.gestures.RecognizerCallback`1[T] callback, System.Func`1[TResult] debugReport) [0x0001e] in D:\study\App_Practice\Assets\UIWidgets\Runtime\gestures\recognizer.cs:70
Unity.UIWidgets.widgets.DialogUtils.showGeneralDialog (Unity.UIWidgets.widgets.BuildContext context, Unity.UIWidgets.widgets.RoutePageBuilder pageBuilder, System.Boolean barrierDismissible, Unity.UIWidgets.ui.Color barrierColor, System.Nullable`1[T] transitionDuration, Unity.UIWidgets.widgets.RouteTransitionsBuilder transitionBuilder) (at Assets/UIWidgets/Runtime/widgets/routes.cs:822)
Unity.UIWidgets.material.DialogUtils.showDialog (Unity.UIWidgets.widgets.BuildContext context, System.Boolean barrierDismissible, Unity.UIWidgets.widgets.WidgetBuilder builder) (at Assets/UIWidgets/Runtime/material/dialog.cs:296)
_MyGalleryState+<>c__DisplayClass4_0.<build>b__0 () (at Assets/Script/GalleryEX.cs:114)
Unity.UIWidgets.material._RawMaterialButtonState.<build>b__3_0 () (at Assets/UIWidgets/Runtime/material/button.cs:148)
Unity.UIWidgets.material._InkResponseState`1[T]._handleTap (Unity.UIWidgets.widgets.BuildContext context) (at Assets/UIWidgets/Runtime/material/ink_well.cs:282)
Unity.UIWidgets.material._InkResponseState`1+<>c__DisplayClass14_0[T].<build>b__0 () (at Assets/UIWidgets/Runtime/material/ink_well.cs:346)
Unity.UIWidgets.gestures.TapGestureRecognizer.<_checkUp>b__14_1 () (at Assets/UIWidgets/Runtime/gestures/tap.cs:132)
Unity.UIWidgets.gestures.GestureRecognizer.invokeCallback[T] (System.String name, Unity.UIWidgets.gestures.RecognizerCallback`1[T] callback, System.Func`1[TResult] debugReport) (at Assets/UIWidgets/Runtime/gestures/recognizer.cs:70)
UnityEngine.Debug:LogException(Exception)
Unity.UIWidgets.foundation.D:logError(String, Exception) (at Assets/UIWidgets/Runtime/foundation/debug.cs:15)
Unity.UIWidgets.foundation.UIWidgetsError:dumpErrorToConsole(UIWidgetsErrorDetails, Boolean) (at Assets/UIWidgets/Runtime/foundation/assertions.cs:120)
Unity.UIWidgets.foundation.UIWidgetsError:dumpErrorToConsole(UIWidgetsErrorDetails) (at Assets/UIWidgets/Runtime/foundation/assertions.cs:105)
Unity.UIWidgets.foundation.UIWidgetsError:reportError(UIWidgetsErrorDetails) (at Assets/UIWidgets/Runtime/foundation/assertions.cs:131)
Unity.UIWidgets.gestures.GestureRecognizer:invokeCallback(String, RecognizerCallback`1, Func`1) (at Assets/UIWidgets/Runtime/gestures/recognizer.cs:73)
Unity.UIWidgets.gestures.TapGestureRecognizer:_checkUp() (at Assets/UIWidgets/Runtime/gestures/tap.cs:131)
Unity.UIWidgets.gestures.TapGestureRecognizer:handlePrimaryPointer(PointerEvent) (at Assets/UIWidgets/Runtime/gestures/tap.cs:53)
Unity.UIWidgets.gestures.PrimaryPointerGestureRecognizer:handleEvent(PointerEvent) (at Assets/UIWidgets/Runtime/gestures/recognizer.cs:262)
Unity.UIWidgets.gestures.PointerRouter:_dispatch(PointerEvent, PointerRoute) (at Assets/UIWidgets/Runtime/gestures/pointer_router.cs:47)
Unity.UIWidgets.gestures.PointerRouter:route(PointerEvent) (at Assets/UIWidgets/Runtime/gestures/pointer_router.cs:60)
Unity.UIWidgets.gestures.GestureBinding:handleEvent(PointerEvent, HitTestEntry) (at Assets/UIWidgets/Runtime/gestures/binding.cs:161)
Unity.UIWidgets.gestures.GestureBinding:dispatchEvent(PointerEvent, HitTestResult) (at Assets/UIWidgets/Runtime/gestures/binding.cs:152)
Unity.UIWidgets.gestures.GestureBinding:_handlePointerEvent(PointerEvent) (at Assets/UIWidgets/Runtime/gestures/binding.cs:106)
Unity.UIWidgets.gestures.GestureBinding:_flushPointerEventQueue() (at Assets/UIWidgets/Runtime/gestures/binding.cs:43)
Unity.UIWidgets.gestures.GestureBinding:_handlePointerDataPacket(PointerDataPacket) (at Assets/UIWidgets/Runtime/gestures/binding.cs:29)
Unity.UIWidgets.editor.<>c__DisplayClass32_0:<postPointerEvents>b__0() (at Assets/UIWidgets/Runtime/editor/editor_window.cs:250)
Unity.UIWidgets.editor.WindowAdapter:withBinding(Action) (at Assets/UIWidgets/Runtime/editor/editor_window.cs:259)
Unity.UIWidgets.editor.WindowAdapter:postPointerEvents(List`1) (at Assets/UIWidgets/Runtime/editor/editor_window.cs:250)
Unity.UIWidgets.editor.WindowAdapter:postPointerEvent(PointerData) (at Assets/UIWidgets/Runtime/editor/editor_window.cs:254)
Unity.UIWidgets.engine.UIWidgetsPanel:OnPointerUp(PointerEventData) (at Assets/UIWidgets/Runtime/engine/UIWidgetsPanel.cs:293)
UnityEngine.EventSystems.EventSystem:Update() (at C:/Program Files/Unity/Hub/Editor/2019.2.18f1/Editor/Data/Resources/PackageManager/BuiltInPackages/com.unity.ugui/Runtime/EventSystem/EventSystem.cs:377)

[kuro7766]

I think it's because you have used material widgets in your code, so you need to wrap your app in a material app.This solution also applies to flutter.
I removed your font resources loading and changed your source code to this

source code

using Unity.UIWidgets.engine;
using Unity.UIWidgets.material;
using Unity.UIWidgets.painting;
using Unity.UIWidgets.ui;
using Unity.UIWidgets.widgets;
using UnityEngine;
using System;
using System.Collections.Generic;
using DialogUtils = Unity.UIWidgets.material.DialogUtils;

public class GalleryEX : UIWidgetsPanel
{
    protected override Widget createWidget()
    {
        return new
            MaterialApp(home: new MyGallery(
            ));
    }
}

class MyGallery : StatefulWidget
{
    public override State createState()
    {
        return new _MyGalleryState();
    }
}

class _MyGalleryState : State<MyGallery>
{
    Unity.UIWidgets.ui.Color pColor = Colors.blueAccent;
    int _idx = 0;
    List<string> menuList = new List<string> {"메인", "측정일지", "메뉴", "커뮤니티", "프리미엄"};

    List<Widget> pageList = new List<Widget>
    {
        new ListView(
            padding: EdgeInsets.all(20)
        ),
    };

    public override Widget build(BuildContext context)
    {
        TextStyle _normalSt = new TextStyle(color: Colors.grey);
        Widget home = new Scaffold(
            appBar: new AppBar(
                backgroundColor: pColor
                , title: new Text(menuList[_idx]
                    , style: new TextStyle(color: Colors.white)
                )
                , centerTitle: true
                , leading: new BackButton(color: Colors.white)
                , actions: new List<Widget>
                {
                    new IconButton(icon: new Icon(icon: Icons.menu, color: Colors.white))
                }
            )
            , body: new Column(
                children: new List<Widget>
                {
                    new RaisedButton(
                        child: new Text("Select Date"),
                        onPressed: () =>
                        {
                            Debug.Log("aaa");
                            /*Unity.UIWidgets.material.DialogUtils.showDialog(context:context , builder: (_context)=>
                            {
                                return  new AlertDialog(
                                  actions: new List<Widget>
                                     {
                                           new FlatButton(child: new Text("Close"),
                                             onPressed: ()=>{
                                                 Navigator.pop(_context);
                                             }
                                           )
                                      }
                                 );
                            }
                            );*/
                            /*DatePickerUtils.showDatePicker(
                            context:context,
                            initialDate:DateTime.Now,
                            firstDate:new DateTime(2020),
                            lastDate:new DateTime(2030),
                            selectableDayPredicate: _decideWhichDayToEnable
                             )*/
                            ;
                            Navigator.of(context);
                            DialogUtils.showDialog(context:
                                context,
                                builder: (
                                    _context) =>
                                {
                                    return new Scaffold(backgroundColor: Colors.transparent,
                                        body: new Text("hello world"));
                                    ;
                                }
                            ).Then((p) => { Debug.Log("das"); });
                        }
                    )
                }
            )
            , bottomNavigationBar: new BottomNavigationBar(
                selectedItemColor: pColor,
                onTap: (index) =>
                {
                    setState(() =>
                    {
                        _idx = index;
                        Debug.Log(_idx);
                    });
                }
                , currentIndex: _idx
                ,
                items:
                new List<BottomNavigationBarItem>()
                {
                    new BottomNavigationBarItem(icon: new Icon(icon: Icons.home, color: Colors.grey),
                        title: new Text("Home", style: _normalSt),
                        activeIcon: new Icon(icon: Icons.home, color: pColor)),
                    new BottomNavigationBarItem(icon: new Icon(icon: Icons.book, color: Colors.grey),
                        title: new Text("Diary", style: _normalSt),
                        activeIcon: new Icon(icon: Icons.book, color: pColor)),
                    new BottomNavigationBarItem(icon: new Icon(icon: Icons.check, color: Colors.grey),
                        title: new Text("Menu", style: _normalSt),
                        activeIcon: new Icon(icon: Icons.check, color: pColor)),
                    new BottomNavigationBarItem(icon: new Icon(icon: Icons.sms, color: Colors.grey),
                        title: new Text("SNS", style: _normalSt), activeIcon: new Icon(icon: Icons.sms, color: pColor)),
                    new BottomNavigationBarItem(icon: new Icon(icon: Icons.chat, color: Colors.grey),
                        title: new Text("Premium", style: _normalSt),
                        activeIcon: new Icon(icon: Icons.chat, color: pColor)),
                }
            )
        );
        return home;
    }

    bool _decideWhichDayToEnable(DateTime day)
    {
        if ((day - DateTime.Now).TotalDays > 0 &&
            (DateTime.Now - day).TotalDays > 10)
        {
            return true;
        }

        return false;
    }

    public override void initState()
    {
        base.initState();
    }

    public override void dispose()
    {
        base.dispose();
    }
}

[pallenJ]

Now it works.
Thank you very much for your kind reply.