我正在使用一个webview加载一个具有视频通话功能的网址。当我尝试发起视频通话时。我得到以下错误“权限被拒绝。请刷新页面并允许访问您的摄像头和麦克风”。

如果我给予Android运行时权限CAMERA和RECORD_AUDIO。视频通话将被启动，视频也将被传输到计算机。但在移动的端，我不能查看我的视频以及接收器的视频。它只显示getDefaultVideoPoster（）。

我已经尝试使用WebChromeClient和WebViewClient，但仍然没有运气。
下面是我的代码：

private WebView webView;

    webView = findViewById(R.id.webview);
    WebSettings webSettings = webView.getSettings();
    webSettings.setJavaScriptEnabled(true);
    webSettings.setDomStorageEnabled(true);
    webSettings.setSaveFormData(true);
    webSettings.setSupportZoom(false);
    webSettings.setCacheMode(WebSettings.LOAD_NO_CACHE);
    webSettings.setPluginState(WebSettings.PluginState.ON);
    webSettings.setUseWideViewPort(true);
    webSettings.setLoadWithOverviewMode(true);

    webView.setWebViewClient(new MyWebViewClient());
    webView.setWebChromeClient(new WebChromeClient() {
        @Override
        public void onPermissionRequest(final PermissionRequest request) {
            myRequest = request;

            for (String permission : request.getResources()) {
                switch (permission) {
                    case "android.webkit.resource.AUDIO_CAPTURE": {
                        askForPermission(request.getOrigin().toString(), Manifest.permission.RECORD_AUDIO, MY_PERMISSIONS_REQUEST_RECORD_AUDIO);
                        break;
                    }
                    case Manifest.permission.RECORD_AUDIO: {
                        askForPermission(request.getOrigin().toString(), Manifest.permission.RECORD_AUDIO, MY_PERMISSIONS_REQUEST_RECORD_AUDIO);
                        break;
                    }
                    case Manifest.permission.CAMERA: {
                        askForPermission(request.getOrigin().toString(), Manifest.permission.CAMERA, MY_PERMISSIONS_REQUEST_CAMERA);
                        break;
                    }
                }
            }
        }

        @Nullable
        @Override
        public Bitmap getDefaultVideoPoster() {
            Log.i(TAG, "getDefaultVideoPoster");
            return drawableToBitmap(getResources().getDrawable( R.drawable.ic_temperature));
            //return super.getDefaultVideoPoster();
        }

        @Override
        public void onShowCustomView(View view, CustomViewCallback callback) {
            super.onShowCustomView(view, callback);
            Log.i(TAG, "onShowCustomView");
            if (view instanceof FrameLayout){
                FrameLayout frame = (FrameLayout) view;
                if (frame.getFocusedChild() instanceof VideoView){
                    VideoView video = (VideoView) 
                    frame.getFocusedChild();
                    frame.removeView(video);
                    video.start();
                }
            }
        }
    });