Flutter webview camera permission

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Flutter WebView Camera Permission

To enable camera permissions in a Flutter WebView, you need to handle permissions requests as well as provide the necessary configuration in both your Flutter code and the Android/iOS platform code. The process involves adding the appropriate permissions and handling any necessary callbacks. Here’s a detailed explanation of the steps involved along with examples.

1. Flutter Code

In your Flutter code, you need to use the flutter_webview_plugin package (or any other WebView package of your choice). Here’s an example of how you can configure the WebView to request camera permissions: 

  
import 'package:flutter/material.dart';
import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'WebView Camera Permission',
      home: Scaffold(
        appBar: AppBar(
          title: Text('WebView Camera Permission'),
        ),
        body: Center(
          child: WebviewScaffold(
            url: 'https://example.com',
            withJavascript: true,
            withLocalUrl: true,
            hidden: true,
            appBar: AppBar(
              automaticallyImplyLeading: false,
            ),
            geolocationEnabled: true,
            mediaPlaybackRequiresUserGesture: false,
            allowFileURLs: true,
            // Enable camera permissions
            withZoom: true,
            withLocalStorage: true,
            localUrlScope: '',
            userAgent: null,
            appCacheEnabled: false,
            clearCache: true,
            clearCookies: true,
            ignoreSSLErrors: true,
            invalidUrlRegex: null,
            appCacheMaxSize: 0,
            appCachePath: '',
            // Handle camera permission requests
            javascriptChannels: Set.from([
              JavascriptChannel(
                name: 'cameraPermission',
                onMessageReceived: (JavascriptMessage message) {
                  if (message.message == 'requestCameraPermission') {
                    // Request camera permissions here
                    requestCameraPermission();
                  }
                },
              ),
            ]),
          ),
        ),
      ),
    );
  }

  void requestCameraPermission() {
    // Implement camera permission request logic here
    // You can use the permission_handler package to handle permission requests
    
    // Example code to request camera permission
    // Permission.camera.request().then((status) {
    //   if (status.isGranted) {
    //     // Permission granted, continue with WebView operations
    //   } else {
    //     // Permission denied, display an error or handle it accordingly
    //   }
    // });
  }
}

In the above example, `WebviewScaffold` is used from the `flutter_webview_plugin` package. The `javascriptChannels` property is set to a `Set` containing a `JavascriptChannel` named `cameraPermission`. This channel is responsible for handling camera permission requests from the WebView.

2. Android Platform Code

To handle camera permissions on the Android platform, you need to modify the AndroidManifest.xml file and handle the WebView’s `onPermissionRequest` event. Here’s an example of how it can be done: 

  
// AndroidManifest.xml file (inside the <manifest> tag)


<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />

<application
    ...
    <activity
        ...
    >
    
        <!-- Add the following meta-data -->
        <meta-data
            android:name="flutter_webview_plugin.EmptyActivity"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
            android:hardwareAccelerated="true"
            android:theme="@android:style/Theme.Translucent.NoTitleBar.Fullscreen"
        />
        
    </activity>
    ...
</application>

// MainActivity.java file

import android.webkit.PermissionRequest;
import io.flutter.embedding.android.FlutterActivity;
import io.flutter.embedding.engine.FlutterEngine;

public class MainActivity extends FlutterActivity {

  @Override
  public void configureFlutterEngine(FlutterEngine flutterEngine) {
    super.configureFlutterEngine(flutterEngine);
    new FlutterWebViewPluginDelegate(this).onCreate();
  }
  
  // Handle permission requests
  @Override
  public void onPermissionRequest(final PermissionRequest request) {
    request.grant(request.getResources());
  }
}

In the above example, the necessary permissions and features are added to the `AndroidManifest.xml` file. Additionally, inside the `MainActivity.java` file, the `onPermissionRequest` method is overridden to handle permission requests and grant the necessary permissions. This allows the WebView to use the camera.

3. iOS Platform Code

To handle camera permissions on the iOS platform, you need to modify the Info.plist file. Here’s an example of how it can be done: 

  
// Info.plist file (inside the <dict> tag)

<key>NSCameraUsageDescription</key>
<string>Allow access to the camera</string>

In the above example, the `NSCameraUsageDescription` key is added to the `Info.plist` file with a description explaining why camera access is required. This is a prerequisite for camera permission requests in iOS.

With the above configurations in place, your Flutter WebView should now be able to request and use camera permissions as needed.

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