Flutter 在按下按钮或 onpressed 事件后授予相机和麦克风权限

Posted 2023-02-19

【中文标题】Flutter 在按下按钮或 onpressed 事件后授予相机和麦克风权限

【英文标题】：Flutter give camera and microphone permissions after pressing button or on onpressed event

【发布时间】：2020-12-08 00:41:36

【问题描述】：

我需要在单击按钮时授予相机和麦克风权限。我希望我的权限一个接一个地出现，但在这种情况下，只出现麦克风权限。要授予相机权限，我必须再次按下按钮。

我怎样才能做到这一点？

            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: "https://appr.tc/r/158489234",
                initialOptions: InAppWebViewGroupOptions(
                  crossPlatform: InAppWebViewOptions(
                    mediaPlaybackRequiresUserGesture: false,
                    debuggingEnabled: true,
                  ),
                ),
                onWebViewCreated: (InAppWebViewController controller) 
                  _webViewController = controller;
                ,
                androidOnPermissionRequest: (
                    InAppWebViewController controller, String origin,
                    List<String> resources) async 
                  return PermissionRequestResponse(resources: resources,
                      action: PermissionRequestResponseAction.GRANT);
                
            ),
          ),
        )

      ],
    )
);

【参考方案1】：

您可以在下面复制粘贴运行完整代码 你可以等待Permission.microphone.request(); 和await Permission.camera.request(); 代码sn-p

Future webViewMethod() async 
    print('In Microphone permission method');
    //WidgetsFlutterBinding.ensureInitialized();

    await Permission.microphone.request();
    WebViewMethodForCamera();

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

工作演示

完整代码

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();

    await Permission.microphone.request();
    WebViewMethodForCamera();

  
  Future WebViewMethodForCamera() async
    print('In Camera permission method');
    //WidgetsFlutterBinding.ensureInitialized();
    await 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: "https://appr.tc/r/158489234",
                    initialOptions: InAppWebViewGroupOptions(
                      crossPlatform: InAppWebViewOptions(
                        mediaPlaybackRequiresUserGesture: false,
                        debuggingEnabled: true,
                      ),
                    ),
                    onWebViewCreated: (InAppWebViewController controller) 
                      _webViewController = controller;
                    ,
                    androidOnPermissionRequest: (
                        InAppWebViewController controller, String origin,
                        List<String> resources) async 
                      return PermissionRequestResponse(resources: resources,
                          action: PermissionRequestResponseAction.GRANT);
                    
                ),
              ),
            )

          ],
        )
    );
   

void main() 
  runApp(MyApp());


class MyApp extends StatelessWidget   
  @override
  Widget build(BuildContext context) 
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(       
        primarySwatch: Colors.blue,       
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: IframeScreen(),
    );
  


class MyHomePage extends StatefulWidget 
  MyHomePage(Key key, this.title) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();


class _MyHomePageState extends State<MyHomePage> 
  int _counter = 0;

  void _incrementCounter() 
    setState(()      
      _counter++;
    );
  

  @override
  Widget build(BuildContext context)     
    return Scaffold(
      appBar: AppBar(       
        title: Text(widget.title),
      ),
      body: Center(        
        child: Column(          
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
    );
  

【讨论】：

很高兴为您提供帮助。如果对您有帮助，请将其标记为答案。谢谢。

@chunhunghan.我正在使用 InAppWebView 进行文件上传，但我无法上传图像。我可以从设备中选择图像，但无法上传，因为它一直在加载。我需要在 Android 中提供一些额外的权限吗？

@utkarsh，你能把你的重现代码发布到一个新问题上吗？谢谢。

【参考方案2】：

尝试

await WebViewMethodForCamera();