Flutter url_launcher 未处理的异常 : Could not launch youtube url (Caused by canLaunch)

Question

我正在尝试使用 url_launcher通过链接打开 YouTube 视频的插件，但 canLaunch函数不断抛出错误。我只能通过完全删除 canLaunch 来绕过这个错误。功能，但无法弄清楚出了什么问题。
代码不起作用:

_goToVideo(YoutubeVideoData video) async {
  if (await canLaunch(video.url)) {
    await launch(video.url);
  } else {
    throw 'Could not launch ${video.url}';
  }
}

代码工作:

_goToVideo(YoutubeVideoData video) async {
  await launch(video.url);
}

我不太确定为什么我不能使用 canLaunch方法如 README Example 中所写
错误:

E/flutter (12574): [ERROR:flutter/lib/ui/ui_dart_state.cc(166)] Unhandled Exception: Could not launch https://www.youtube.com/watch?v=-3g5WlqJtIo
E/flutter (12574): #0      _goToVideo (package:esfandapp/widgets/newsList/videoCard.dart:71:5)
E/flutter (12574): <asynchronous suspension>
E/flutter (12574): #1      VideoCard.build.<anonymous closure> (package:esfandapp/widgets/newsList/videoCard.dart:13:20)
E/flutter (12574): #2      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:992:19)
E/flutter (12574): #3      _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:1098:38)
E/flutter (12574): #4      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:184:24)
E/flutter (12574): #5      TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:524:11)
E/flutter (12574): #6      BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:284:5)
E/flutter (12574): #7      BaseTapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:256:7)
E/flutter (12574): #8      GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:158:27)
E/flutter (12574): #9      GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:224:20)
E/flutter (12574): #10     GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:200:22)
E/flutter (12574): #11     GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:158:7)
E/flutter (12574): #12     GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:104:7)
E/flutter (12574): #13     GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:88:7)
E/flutter (12574): #14     _rootRunUnary (dart:async/zone.dart:1206:13)
E/flutter (12574): #15     _CustomZone.runUnary (dart:async/zone.dart:1100:19)
E/flutter (12574): #16     _CustomZone.runUnaryGuarded (dart:async/zone.dart:1005:7)
E/flutter (12574): #17     _invoke1 (dart:ui/hooks.dart:267:10)
E/flutter (12574): #18     _dispatchPointerDataPacket (dart:ui/hooks.dart:176:5)

使用函数的小部件:

class VideoCard extends StatelessWidget {
  final YoutubeVideoData video;
  VideoCard({this.video});

  @override
  Widget build(BuildContext context) {
    return InkWell(
      onTap: () => _goToVideo(video),
      child: Container(
        child: Card(
          child: Container(
            child: Column(
              children: [
                Align(
                  child: Padding(
                    child: Text(
                      video.title,
                      style: TextStyle(
                        fontFamily: 'Roboto Condensed',
                        fontSize: 16,
                      ),
                    ),
                    padding: EdgeInsets.fromLTRB(15, 0, 15, 10),
                  ),
                  alignment: Alignment.centerLeft,
                ),
                Container(
                    child: Image.network(video.thumbnails[1], fit: BoxFit.cover,),
                  width: MediaQuery.of(context).size.width,
                ),
                Align(
                  child: Container(
                    child: Text(
                      video.date.toString() + "",
                      style: TextStyle(
                        fontFamily: 'Roboto Condensed',
                        fontSize: 14,
                        fontWeight: FontWeight.w300,
                      ),
                    ),
                    padding: EdgeInsets.fromLTRB(15, 5, 15, 0),
                  ),
                  alignment: Alignment.centerLeft,
                ),
              ],
            ),
            width: MediaQuery.of(context).size.width - 32,
            padding: EdgeInsets.symmetric(
              horizontal: 0,
              vertical: 10,
            ),
            alignment: Alignment.center,
          ),
          shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.all(Radius.circular(25))),
        ),
      ),
    );
  }
}

Answer 1

从 API30 (Android 11) 开始，您的 Android 应用程序必须列出它与之交互的所有应用程序。
你可以加:

<uses-permission android:name="android.permission.QUERY_ALL_PACKAGES"/>

在您的 android manifest 中绕过它或专门列出它们。
欲了解更多信息:
https://developer.android.com/about/versions/11/privacy/package-visibility