小编utk*_*rsh的帖子

在下面的示例中，我在按下“凸起”按钮时打开了一个模态底部工作表在打开的工作表中，我有另一个图标可以打开另一个工作表，但我想在打开第二个底部后关闭第一个工作表床单。我怎样才能实现这个目标？

         import 'package:flutter/material.dart';

        class SecondScreen extends StatefulWidget {
         @override
        _SecondScreenState createState() => _SecondScreenState();
        }

        class _SecondScreenState extends State<SecondScreen> {
           @override
            Widget build(BuildContext context) {
              return Center(
                child: Container(
                 child:RaisedButton(child: Text('Click'), onPressed: () => _openSheet()),
                     ),
                  );
              }

           _openSheet() {
                        showModalBottomSheet(
                          context: context,
                          builder: (BuildContext context) 
                       {
                                return Column(
                                 children: <Widget>[
                                   Container(
                                     height: MediaQuery.of(context).size.height / 2,
                                     width: MediaQuery.of(context).size.width,
                                      child: IconButton(
                                       icon: Icon(Icons.info),
                                        iconSize: 50.0,
                                         onPressed: () => _openSecondSheet(),
                                          ),
                                         ),
                                        ],
                                       );
                                    });
                                  }

                             _openSecondSheet() {
                                showModalBottomSheet(
                               context: context,
                               builder: (BuildContext …

我需要通过单击按钮授予相机和麦克风权限。我希望我的权限依次出现，但在这种情况下，仅出现麦克风权限。要授予相机权限，我必须再次按下按钮。

我怎样才能实现这个目标？

            import 'package:flutter/material.dart';
            import 'package:flutter_inappwebview/flutter_inappwebview.dart';
            import 'package:permission_handler/permission_handler.dart';

            class IframeScreen extends StatefulWidget {
            @override
           _IframeScreenState createState() => _IframeScreenState();
             }

             class _IframeScreenState extends State<IframeScreen> {
              InAppWebViewController _webViewController;

              Future webViewMethod() async {
              print('In Microphone permission method');
              WidgetsFlutterBinding.ensureInitialized();
            
              Permission.microphone.request();
              WebViewMethodForCamera();

             }
              Future WebViewMethodForCamera() async{
               print('In Camera permission method');
               WidgetsFlutterBinding.ensureInitialized();
               Permission.camera.request();
              }



            @override
            Widget build(BuildContext context) {
            return Scaffold(
            appBar: AppBar(
            title: Text('Check this frame'),
           ),
             body: Column(
      children: <Widget>[
        RaisedButton(
          onPressed: webViewMethod,
          child: Text('Join'),
          textColor: Colors.black,
        ),

        Expanded(
          child: Container(
            child: InAppWebView(
                initialUrl: …