下载PDF文件

Question

In my application, the user needs to download PDF file from an url and store it on sdcard. But the catch here is I can only use DefaultHttpClient to access the url. I found couple of solutions but none used DefaultHttpClient. After downloading the PDF, I would also likie to view the PDF in my application.

Answer 1

//use this method to download the pdf file

 public void downloadPdfContent(String urlToDownload){

             try {

                 String fileName="xyz";
             String fileExtension=".pdf";

//           download pdf file.

                URL url = new URL(urlToDownload);
                HttpURLConnection c = (HttpURLConnection) url.openConnection();
                c.setRequestMethod("GET");
                c.setDoOutput(true);
                c.connect();
                String PATH = Environment.getExternalStorageDirectory() + "/mydownload/";
                File file = new File(PATH);
                file.mkdirs();
                File outputFile = new File(file, fileName+fileExtension);
                FileOutputStream fos = new FileOutputStream(outputFile);
                InputStream is = c.getInputStream();
                byte[] buffer = new byte[1024];
                int len1 = 0;
                while ((len1 = is.read(buffer)) != -1) {
                    fos.write(buffer, 0, len1);
                }
                fos.close();
                is.close();

               System.out.println("--pdf downloaded--ok--"+urlToDownload);
            } catch (Exception e) {
                e.printStackTrace();

            }
    }

// for viewing the pdf use this method

private void onPdfClick()
    {

//      String pdfFile = Environment.getExternalStorageDirectory()+ File.separator + AstroManager.file.getName();

         Intent intent = new Intent(Intent.ACTION_VIEW);
         intent.setDataAndType(Uri.fromFile(new File("/sdcard/mydownload/xyz.pdf"), "application/*");

         startActivity(intent);
    }

Answer 2

If you have to open pdf file, pdf reader must have to be installed in your device.Otherwise it will show blank screen. Also here is good example to download pdf from server and view its contents .

Answer 3

请参阅http://developer.android.com/reference/org/apache/http/client/methods/HttpGet.html ，以使用DefaultHttpClient从网址中检索数据