如何在android webview上使用mediadevices.getusermedia运行网页

WebView webView = findViewById(R.id.webView);
WebSettings webSettings = webView.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setMediaPlaybackRequiresUserGesture(false);
webSettings.setBuiltInZoomControls(true);
webSettings.setDisplayZoomControls(false);
webSettings.setDomStorageEnabled(true);
webSettings.setDatabaseEnabled(true);
webSettings.setAppCacheEnabled(true);
webSettings.setAllowFileAccess(true);
webSettings.setAllowContentAccess(true);
webSettings.setAllowFileAccessFromFileURLs(true);
webSettings.setAllowUniversalAccessFromFileURLs(true);

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

webView.loadUrl("https://example.com");

navigator.mediaDevices.getUserMedia({ audio: true, video: true })
    .then(function(stream) {
        // 处理媒体流
    })
    .catch(function(error) {
        // 处理错误
    });