xamarin.forms - Xamarin 表单 webview 未在我的设备中显示图表数据

Question

我已经使用 WebView 来使用 URL 显示数据，但我的图表视图没有加载到 webview 中，我还为 webview 提供了以下所有权限。

Control.Settings.JavaScriptEnabled = true;
Control.Settings.LoadWithOverviewMode = true;
Control.Settings.DatabaseEnabled = true;
Control.Settings.UseWideViewPort = true;
Control.Settings.AllowFileAccess = true;
Control.Settings.AllowContentAccess = true;
Control.Settings.AllowFileAccessFromFileURLs = true;
Control.Settings.AllowUniversalAccessFromFileURLs = true;
Control.Settings.JavaScriptCanOpenWindowsAutomatically = true;
Control.Settings.DomStorageEnabled = true;
Control.VerticalScrollBarEnabled = true;
Control.SetWebViewClient(new WebClient(this));

 class WebClient : WebViewClient
        {
            WebViewRendererForAndroid _renderer;
            public WebClient(WebViewRendererForAndroid renderer)
            {
                _renderer = renderer ?? throw new ArgumentNullException("renderer");
            }
            public override bool ShouldOverrideUrlLoading(AWebView view, string url)
            {
                try
                {
                    var Token = UserSettings.AccesToken;
                    Dictionary<String, String> headers = new Dictionary<String, String>();
                    headers.Add("Authorization", Token);
                    view.LoadUrl(url, headers);
                }
                catch (Exception ex)
                {
                }
                return true;
            }
            public override void OnReceivedError(AWebView view, IWebResourceRequest request, WebResourceError error)
            {
                base.OnReceivedError(view, request, error);
            }
            public override void OnReceivedHttpError(AWebView view, IWebResourceRequest request, WebResourceResponse errorResponse)
            {
                base.OnReceivedHttpError(view, request, errorResponse);
                var source = new UrlWebViewSource { Url = request.Url.ToString() };
                var args = new WebNavigatedEventArgs(WebNavigationEvent.NewPage, source, request.Url.ToString(), WebNavigationResult.Failure);
                _renderer.ElementController.SendNavigated(args);
            }
            public override void OnReceivedError(AWebView view, [GeneratedEnum] ClientError errorCode, string description, string failingUrl)
            {
                base.OnReceivedError(view, errorCode, description, failingUrl);
                var source = new UrlWebViewSource { Url = failingUrl };
                var args = new WebNavigatedEventArgs(WebNavigationEvent.NewPage, source, failingUrl, WebNavigationResult.Failure);
                _renderer.ElementController.SendNavigated(args);
            }

        }

标签： xamarin.formswebviewandroid-webviewwebviewclient

Answer 1

我已经使用 javascript 解决了这些问题，我们必须在页面加载完成后注入 javascript 函数。

public override void OnPageFinished(AWebView view, string url)
{
   base.OnPageFinished(view, url);

   view.LoadUrl("javascript:(loadData('" + Token + "'))");
}