在WebView中下载文件

Question

我的Android应用程序中有一个webview。当用户转到webview并点击链接下载文件时，什么都不会发生。

URL = "my url"; 
mWebView = (WebView) findViewById(R.id.webview); 
mWebView.setWebViewClient(new HelloWebViewClient()); 
mWebView.getSettings().setDefaultZoom(ZoomDensity.FAR); 
mWebView.loadUrl(URL); 
Log.v("TheURL", URL); 

如何启用在webview内下载？如果我禁用webview并启用意图从应用程序加载浏览器上的URL，然后下载无缝工作。

String url = "my url"; 
Intent i = new Intent(Intent.ACTION_VIEW); 
i.setData(Uri.parse(url)); 
startActivity(i); 

有人可以帮我吗？该页面加载没有问题，但链接到HTML页面中的图像文件不工作...

Answer 1

你试过了吗？

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); 
    } 
}); 

Answer 2

尝试使用下载管理器，它可以帮助你下载你想要的一切，节省你的时间。

检查那些选项：

选择1 - >

mWebView.setDownloadListener(new DownloadListener() { 
     public void onDownloadStart(String url, String userAgent, 
       String contentDisposition, String mimetype, 
       long contentLength) { 
Request request = new Request(
          Uri.parse(url)); 
        request.allowScanningByMediaScanner(); 
        request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED); 
        request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "download"); 
        DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE); 
        dm.enqueue(request);   

     } 
    }); 

选择2 - >

if(mWebview.getUrl().contains(".mp3") { 
Request request = new Request(
         Uri.parse(url)); 
       request.allowScanningByMediaScanner(); 
       request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED); 
       request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "download"); 
// You can change the name of the downloads, by changing "download" to everything you want, such as the mWebview title... 
       DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE); 
       dm.enqueue(request);   

    } 

Answer 3

尝试了这一点。在经历了很多帖子和论坛之后，我发现了这一点。

mWebView.setDownloadListener(new DownloadListener() {  

    @Override 
    public void onDownloadStart(String url, String userAgent, 
            String contentDisposition, String mimetype, 
            long contentLength) { 
      DownloadManager.Request request = new DownloadManager.Request(
        Uri.parse(url)); 

      request.allowScanningByMediaScanner(); 
      request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED); //Notify client once download is completed! 
      request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "Name of your downloadble file goes here, example: Mathematics II "); 
      DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE); 
      dm.enqueue(request); 
      Toast.makeText(getApplicationContext(), "Downloading File", //To notify the Client that the file is being downloaded 
        Toast.LENGTH_LONG).show(); 

     } 
    }); 

不要忘了给这个权限！这个非常重要！在你的Manifest文件（AndroidManifest.xml文件）中加入这个文件

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />  <!-- for your file, say a pdf to work --> 

希望这会有所帮助。 干杯:)

Answer 4

mwebView.setDownloadListener(new DownloadListener() 
    { 

    @Override 


    public void onDownloadStart(String url, String userAgent, 
     String contentDisposition, String mimeType, 
     long contentLength) { 

    DownloadManager.Request request = new DownloadManager.Request(
      Uri.parse(url)); 


    request.setMimeType(mimeType); 


    String cookies = CookieManager.getInstance().getCookie(url); 


    request.addRequestHeader("cookie", cookies); 


    request.addRequestHeader("User-Agent", userAgent); 


    request.setDescription("Downloading file..."); 


    request.setTitle(URLUtil.guessFileName(url, contentDisposition, 
      mimeType)); 


    request.allowScanningByMediaScanner(); 


    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED); 
    request.setDestinationInExternalPublicDir(
      Environment.DIRECTORY_DOWNLOADS, URLUtil.guessFileName(
        url, contentDisposition, mimeType)); 
    DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE); 
    dm.enqueue(request); 
    Toast.makeText(getApplicationContext(), "Downloading File", 
      Toast.LENGTH_LONG).show(); 
}});