从WebView下载文件返回HTML内容，而不是实际文件 [英] Downloading file from webview returns HTML content not the actual file

问题描述

我正在使用downloadListener从Webview下载文件.可以正确识别文件名，但是会下载html内容.如果相关，我正在尝试下载.apk文件.

I am using a downloadListener to download a file from a webview. The filename is correctly recognized, however the html content is downloaded. In case it is relevant, I am trying to download an .apk file.

      webView.setDownloadListener(new DownloadListener() {

            @Override
            public void onDownloadStart(String url, String userAgent,
                                        String contentDisposition, String mimetype,
                                        long contentLength) {

                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        InputStream is;
                        try {

                            final String filename= URLUtil.guessFileName(url, contentDisposition, mimetype);

                            Log.d("download","filename: "+filename);//filename is correct


                            URL u = new URL(url);
                            HttpURLConnection con = (HttpURLConnection) u.openConnection();
                            con.setRequestMethod("GET");
                            con.connect();
                            is = con.getInputStream();


                            // Path and File where to download the APK
                            File apk = new File(getFilesDir(),filename);
                            FileOutputStream output = new FileOutputStream(apk);

                            // Save file from URL
                            byte[] buffer = new byte[1024];
                            int len = 0;
                            long total=0;

                            while ((len = is.read(buffer)) != -1) {
                                output.write(buffer, 0, len);
                                total += len;
                            }

                            output.close();
                            is.close();

                        }
                        catch (Exception e){
                            e.printStackTrace();
                        }
                    }
                }).start();
            }
        });

推荐答案

更新:解决方案是将 cookie 以及用户代理添加到request属性.

Update: The solution is to add the cookie as well as the user-agent to the request property.

String cookie = CookieManager.getInstance().getCookie(url);
con.setRequestProperty("cookie",cookie);
con.setRequestProperty("User-Agent",userAgent);

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