[英]Parse arguments with Navigator.push shows error too many positional arguments: 0 expected, but 1 found
I want to parse arguments with Navigator.push() to my other dart file.我想用Navigator.push()将 arguments 解析为我的其他 dart 文件。
Because I want to send the path of the selected song in songlist, to the music player main UI (For Playing)因为我想将歌曲列表中所选歌曲的路径发送到音乐播放器主界面(用于播放)
[ songlist.dart ] [ 歌单.dart ]
child:ListView.builder(
itemCount: getSongList()[0].length,
itemBuilder: (BuildContext context, int index) {
return ListTile(
title: Text(getSongList()[1][index].split('/').last,style:
const TextStyle(
fontSize: 21
),),
leading: IconButton(onPressed: (){
Navigator.push(context,MaterialPageRoute(builder: (context) => music_player()));
},
icon: Icon(Icons.my_library_music)),
);
}
)
),
[ musicplayer.dart ] [音乐播放器.dart]
class music_player extends StatefulWidget {
const music_player({Key? key}) : super(key: key);
@override
State<music_player> createState() => _music_playerState();
}
class _music_playerState extends State<music_player> {
// codes
}
Just wanna know how to parse arguments from my first file to second file.只是想知道如何将 arguments 从我的第一个文件解析到第二个文件。 If I pass arguments there will be an error:
如果我通过 arguments 将会出现错误:
too many positional arguments: 0 expected, but 1 found.
位置 arguments 太多:预期 0,但找到 1。
Thanks in advance.提前致谢。
you need to add parameter(selectedSongs) in widget like this:您需要像这样在小部件中添加参数(selectedSongs):
class MusicPlayer extends StatefulWidget {
final selectedSongs;
const MusicPlayer({
Key? key,
this.selectedSongs,
}) : super(key: key);
@override
State<MusicPlayer> createState() => _MusicPlayerState();
}
class _MusicPlayerState extends State<MusicPlayer> {
@override
Widget build(BuildContext context) {
return const Placeholder();
}
}
this way you can use in Navigator.push:这样你就可以在 Navigator.push 中使用:
Navigator.push(context,MaterialPageRoute(builder: (context) => MusicPlayer(selectedSongs: selectedsongList,))));
If your want to pass arguments with Navigator the correct way is:如果您想通过 Navigator 传递 arguments,正确的方法是:
-Register the widget in the routes: - 在路线中注册小部件:
MaterialApp(
routes: {
ExtractArgumentsScreen.routeName: (context) =>
const ExtractArgumentsScreen(),
},
)
-Navigate to the widget: - 导航到小部件:
Navigator.pushNamed(
context,
ExtractArgumentsScreen.routeName,
arguments: // whatever you want to pass,
);
And inside your next page widget:在你的下一页小部件中:
@override
Widget build(BuildContext context) {
final args = ModalRoute.of(context)!.settings.arguments;
return Scafold( ... );
}
All information here: https://docs.flutter.dev/cookbook/navigation/navigate-with-arguments所有信息在这里: https://docs.flutter.dev/cookbook/navigation/navigate-with-arguments
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