android webview下载附件几种方法

下面几种方式都能下载，记录的是稍作修改后的结果。

首先

webView.setDownloadListener(new MyWebViewDownLoadListener());

然后

1、浏览器，不能传递cookie

 private class MyWebViewDownLoadListener implements DownloadListener {        @Override        public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype,long contentLength) {                        Uri uri = Uri.parse(url);            Intent intent = new Intent(Intent.ACTION_VIEW, uri);            startActivity(intent);                   }    }

2、DownloadManager，可传递cookie

http://www.2cto.com/kf/201205/132327.html

 private class MyWebViewDownLoadListener implements DownloadListener {        @Override        public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype,long contentLength) {

//先判断有无权限，否在未授权时app直接跳出

int perm = MainActivity.this.checkCallingOrSelfPermission("android.permission.WRITE_EXTERNAL_STORAGE");

if(perm != PackageManager.PERMISSION_GRANTED){

    Toast.makeText(MainActivity.this,"缺少存储权限:手机-设置-应用管理-权限-存储",Toast.LENGTH_LONG).show();

else {

    DownloadManager downloadManager = ((DownloadManager) getSystemService(Activity.DOWNLOAD_SERVICE));

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

    request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_MOBILE | DownloadManager.Request.NETWORK_WIFI);

    request.setVisibleInDownloadsUi(true);

    //传cookie

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

    request.addRequestHeader("Cookie",CookieStr);

    //contentDisposition本身带有att...一串字符,中文和非中文还不一样

    String fileName;

    if(contentDisposition.indexOf("filename*=UTF-8")!=-1) {

fileName = contentDisposition.substring(contentDisposition.indexOf( "'" ) + 2 , contentDisposition.length());
}
    else{
        fileName = contentDisposition.substring(contentDisposition.indexOf("=") + 1, contentDisposition.length());
     }

    request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fileName);

    //过时的，老版用这句，新版用后面那句

    request.setShowRunningNotification(true);

    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);

    downloadManager.enqueue(request);

        }    }

实际应用中，获取cookie部分是这样写的，这样不必每下一个文件都取一遍

private String CookieStr;private class MyWebViewClient extends WebViewClient {    @Override    public boolean shouldOverrideUrlLoading(WebView view, String url) {        view.loadUrl(url);        return true;    }    public void onPageFinished(WebView view, String url) {        CookieStr =  CookieManager.getInstance().getCookie(url);        super.onPageFinished(view, url);    }}

3、thread，这个cookie问题没试过

http://blog.csdn.net/u013210620/article/details/47184511

contentDisposition是为了修改文件名后加的

 private class MyWebViewDownLoadListener implements DownloadListener {        @Override        public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype,long contentLength) {                   new HttpThread(url,contentDisposition).start();        }    }

public class HttpThread extends Thread {    private String url;    private String contentDisposition;    public HttpThread(String url,String contentDisposition) {        super();        this.url = url;        this.contentDisposition=contentDisposition;    }    @Override    public void run() {        super.run();        try {            URL httpUrl = new URL(url);            HttpURLConnection connection = (HttpURLConnection) httpUrl.openConnection();            connection.setDoInput(true);            connection.setDoOutput(true);            InputStream inputStream = connection.getInputStream();            File downFile = null;            File sdFile = null;            FileOutputStream out = null;            String filename;            Log.e("TAG", "sddd");

            //下面的if有点问题，到这就不执行了，没仔细研究，注释后能过去            //if (Environment.getExternalStorageState().equals(Environment.MEDIA_CHECKING)) {                Log.e("TAG", "sd");                downFile = Environment.getExternalStorageDirectory();

    //contentDisposition本身带有att...一串字符,中文和非中文还不一样

    fileName;

    if(contentDisposition.indexOf("filename*=UTF-8")!=-1) {

fileName = contentDisposition.substring(contentDisposition.indexOf( "'" ) + 2 , contentDisposition.length());
}
    else{
        fileName = contentDisposition.substring(contentDisposition.indexOf("=") + 1, contentDisposition.length());
     }

sdFile = new File(downFile, filename); out = new FileOutputStream(sdFile); // } byte [] b = new byte [ 6 * 1024 ]; int len; while ((len = inputStream.read(b)) != - 1 ) { if (out != null ) { out.write(b, 0 , len); } } if (out != null ) { out.close(); } if (inputStream != null ) { inputStream.close(); } Log. e ( "TAG" , "scca" ); } catch (Exception e) { e.printStackTrace(); } }}

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