Webview没有setDownloadListener（）？

Question

我在通过WebView下载时遇到问题，并找到以下代码：

mWebView.setDownloadListener(new DownloadListener() {
    public void onDownloadStart(String url, String userAgent,
                String contentDisposition, String mimetype,
                long contentLength) {
        Intent i = new Intent(Intent.ACTION_VIEW);
        i.setData(Uri.parse(url));
        startActivity(i);
    }
});

问题是，我的WebView没有功能setDownladListener（）...我也看到他们使用了WebView.loadUrl（），而我也没有，我有WebView.Source ... 为什么我的网络视图不同？以及如何将其更改为？谢谢！

Answer 1

Xamarin Android WebView.SetDownloadListener()

Answer 2

在代码中首先使用Android.Webkit.WebView webView;。

初始化 webView ：

webView = FindViewById<WebView>(Resource.Id.webView1);
webView.Settings.JavaScriptEnabled = true;
webView.SetWebViewClient(new HelloWebViewClient());
webView.LoadUrl("https://www.xamarin.com/university");
webView.SetDownloadListener(new downloadListener());

这需要创建一个自定义HttpClient（ HelloWebViewClient ），这里有LoadUrl方法：

public class HelloWebViewClient : WebViewClient
{
    // For API level 24 and later
    public override bool ShouldOverrideUrlLoading(WebView view, IWebResourceRequest request)
    {
        view.LoadUrl(request.Url.ToString());
        return false;
    }
}

如果要 SetDownloadListener ，则需要创建IDownloadListener：

public void OnDownloadStart(string url, string userAgent, string contentDisposition, string mimetype, long contentLength)
{
    DownloadManager.Request request = new DownloadManager.Request(Android.Net.Uri.Parse(url));

    request.AllowScanningByMediaScanner();
    request.SetNotificationVisibility(DownloadManager.Request.VisibilityVisibleNotifyCompleted);
    request.SetTitle("Download finish");
    request.SetAllowedOverMetered(true);
    request.SetVisibleInDownloadsUi(true);
    request.SetAllowedOverRoaming(true);

    //this file path need dynamic request permission
    //String fileName = URLUtil.GuessFileName(url, contentDisposition, "Downloadfile");
    //request.SetDestinationInExternalPublicDir(Application.Context.GetExternalFilesDir("Download").ToString() , fileName);

    DownloadManager downloadManager = DownloadManager.FromContext(this);
    long downloadId = downloadManager.Enqueue(request);

}