Question

我有一个带有文本框和下载按钮的网页，只要单击该文本框的内容，就会将其下载为文本文件。我可以在Android webview中加载此网页，但是在单击下载按钮时却什么也不做。

因此，我尝试使用android WebView的下载侦听器，此方法在网页开始下载时触发。但是在使用该URI创建DownloadManager.Request时会抛出无效的参数异常。但是，如果我提供了可在线下载的链接（http://25.io/toau/audio/sample.txt），它就可以正常工作。请找到该网页，然后从下面下载侦听器代码。

网页代码

<script language="Javascript" >
function download(filename, text) {
  var pom = document.createElement('a');
  pom.setAttribute('href', 'data:text/plain;charset=utf-8,' + 

encodeURIComponent(text));
  pom.setAttribute('download', filename);

  pom.style.display = 'none';
  document.body.appendChild(pom);

  pom.click();

  document.body.removeChild(pom);
}
</script>

<style>
form * {
  display: block;
  margin: 10px;
}
</style>

<html>
<body>

<form onsubmit="download(this['name'].value, this['text'].value)">
  <input type="text" name="name" value="test.txt">
  <textarea rows=3 cols=50 name="text">Please type in this box. When you 

click the Download button, the contents of this box will be downloaded to 

your machine at the location you specify. </textarea>
  <input type="submit" value="Download">
</form>
</body>
</html>

WeBView代码

public void OnDownloadStart(string url, string userAgent, string contentDisposition, string mimetype, long contentLength)
    {
        //for downloading directly through download manager
        global::Android.Net.Uri uri = global::Android.Net.Uri.Parse(url);
        Request request = new Request(uri);
        request.AllowScanningByMediaScanner();
        request.SetNotificationVisibility(DownloadManager.Request.VisibilityVisibleNotifyCompleted);
        request.SetDestinationInExternalPublicDir(Environment.CurrentDirectory, "MyFile.txt");
        DownloadManager dm = DownloadManager.FromContext(Forms.Context);
        dm.Enqueue(request);
    }

如何在Xamarin Webview中下载Java脚本生成的文件

0 个答案: