我有一个web应用程序，基本上使用quaggajs库使用手机摄像头扫描条形码。
我的应用程序中的摄像头以流模式使用，就像下面的示例站点一样：https://serratus.github.io/quaggajs/examples/live_w_locator.html
但是，当打开webview时，相机不会启动，看起来像以下屏幕截图：https://empsis.com.br/img/screenshot_20210707-141619_saviskietiquetas.jpg
my mainactivity.java：

import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.content.DialogInterface;
import android.net.http.SslError;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.webkit.PermissionRequest;
import android.webkit.SslErrorHandler;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    WebView webView;
    //String url = "http://192.168.1.240";
    String url = "https://serratus.github.io/quaggaJS/examples/live_w_locator.html";

    @SuppressLint("SetJavaScriptEnabled")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        WebView webView = findViewById(R.id.webview);
        webView.getSettings().setDomStorageEnabled(true);
        webView.getSettings().setJavaScriptEnabled(true);
        webView.getSettings().setAllowContentAccess(true);
        webView.getSettings().setAppCacheEnabled(true);
        webView.getSettings().setSaveFormData(true);
        webView.getSettings().setSavePassword(true);
        webView.getSettings().setAllowFileAccess(true);
        webView.getSettings().setAllowFileAccessFromFileURLs(true);
        webView.getSettings().setAllowUniversalAccessFromFileURLs(true);
        webView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
        webView.getSettings().setBuiltInZoomControls(true);
        webView.getSettings().setSupportZoom(true);

        webView.setWebViewClient(new myClientWebView());
        webView.setWebChromeClient(new WebChromeClient() {

            @Override
            public void onPermissionRequest(final PermissionRequest request) {
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
                    request.grant(request.getResources());
                }
            }

        });
        webView.loadUrl(url);

    }

    private class myClientWebView extends WebViewClient {
        @Override
        public void onReceivedSslError(WebView view, final SslErrorHandler handler, SslError error) {
            handler.proceed();
        }
    }
}

my androidmanifest.xml：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="br.com.empsis.saviskietiquetas" >

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.CAMERA"/>
    <uses-feature android:name="android.hardware.camera" />
    <uses-feature android:name="android.hardware.camera.autofocus" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.webkit.PermissionRequest" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/webViewFullScreen"
        android:usesCleartextTraffic="true"
        >
        <activity android:name=".MainActivity" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>```