如何从我的android webview下载Tcpdf生成的pdf

问题描述

需要帮助来解决我的问题。 在我的Android网络视图中，使用 tcpdf 生成的pdf无法正常工作... 它会在pdf中生成一些垃圾值

//下载文件 myWebView.setDownloadListener（new DownloadListener（）{ @Override public void onDownloadStart（String url，String userAgent，String contentdisposition，String mimetype，long contentLength）{

            DownloadManager.Request myRequest = new DownloadManager.Request(Uri.parse(url));
            myRequest.allowScanningByMediaScanner();
            myRequest.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
            //new

            myRequest.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS,"download");


            //create download manager
            DownloadManager myManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);

            myManager.enqueue(myRequest);

            Toast.makeText(MainActivity.this,"Downloding file....",Toast.LENGTH_SHORT).show();


        }
    });

    //TCPDF

    myWebView.setDownloadListener(new DownloadListener() {
        @Override
        public void onDownloadStart(String url,String userAgent,String contentdisposition,String mimetype,long contentLength) {
            //start download
            DownloadPDF downlooadPDF = new DownloadPDF();
            downlooadPDF.execute(url,userAgent,contentdisposition);

            //Toast.makeText(MainActivity.this,"Downloding ...",Toast.LENGTH_SHORT).show();
        }
    });

}


//TCPDF

private class DownloadPDF extends AsyncTask<String,Integer,String> {
    @Override
    protected String doInBackground(String... sUrl) {
        try {
            URL url = new URL(sUrl[0]);

            File myDir = new File(Environment.getExternalStoragePublicDirectory(
                    Environment.DIRECTORY_DOWNLOADS).toString() + "/myPDF");

            // create the directory if it does not exist
            if (!myDir.exists()) myDir.mkdirs();

            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setDoOutput(true);
            connection.connect();

            //get filename from the contentdisposition
            String filename = null;
            Pattern p = Pattern.compile("\"([^\"]*)\"");
            Matcher m = p.matcher(sUrl[2]);
            while (m.find()) {
                filename = m.group(1);
            }

            File outputFile = new File(myDir,filename);

            InputStream input = new BufferedInputStream(connection.getInputStream());
            OutputStream output = new FileOutputStream(outputFile);

            byte data[] = new byte[1024];
            long total = 0;
            int count;
            while ((count = input.read(data)) != -1) {
                total += count;
                output.write(data,count);
            }
            connection.disconnect();
            output.flush();
            output.close();
            input.close();

            displayPdf(); // a function to open the PDF file automatically

        } catch (MalformedURLException e) {
            e.printstacktrace();
        } catch (IOException e) {
            e.printstacktrace();
        }
        return null;
    }

    private void displayPdf() {
        try {

            Object filename = fileList();
            File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS) + "/myPDF/" + filename);




            Intent intent = new Intent();
            intent.setAction(Intent.ACTION_VIEW);
            Uri uri = Uri.fromFile(file);
            intent.setDataAndType(uri,"application/pdf");
            startActivity(intent);
        } catch (Exception e) {
            Log.i("TAG",e.getMessage());
        }
    }

}

解决方法

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