Android - Get the original file name for an async download

android, download, filenames, java, pdf

Solution

Try using `URLUtil.guessFileName()`

Here is a simple example of how using it:

String url = http://...;
String fileExtenstion = MimeTypeMap.getFileExtensionFromUrl(url);
String name = URLUtil.guessFileName(url, null, fileExtenstion);

Problem

I would like to retrieve the original file name from a website while downloading a PDF file, not rename it but save it as the same name under the directory SD/Android/Data/(MyAPP)/Files. As of now I have to tell android what the file name should be when looking for it and what to save it as while downloading. Is there a simple way to change this to save it as the original name? Thanks ``` private void startDownload() { String isFileThere = Environment.getExternalStorageDirectory() + "/Android/Data/" + getApplicationContext().getPackageName() + "/files/xxxxxxxx.pdf"; File f = new File(isFileThere); if (f.exists()) { mProgressDialog.setProgress(0); showPdf(); } else { DownloadFile downloadFile = new DownloadFile(); downloadFile .execute(url); } } class DownloadFile extends AsyncTask<String, Integer, String> { @Override protected void onPreExecute() { super.onPreExecute(); mProgressDialog.show(); } @Override protected void onProgressUpdate(Integer... progress) { super.onProgressUpdate(progress); mProgressDialog.setProgress(progress[0]); } @Override protected String doInBackground(String... aurl) { try { URL url = new URL(aurl[0]); URLConnection connection = url.openConnection(); connection.connect(); int fileLength = connection.getContentLength(); int tickSize = 2 * fileLength / 100; int nextProgress = tickSize; Log.d( "ANDRO_ASYNC", "Lenght of file: " + fileLength); InputStream input = new BufferedInputStream(url.openStream()); String path = Environment.getExternalStorageDirectory() + "/Android/Data/" + getApplicationContext().getPackageName() + "/files"; File file = new File(path); file.mkdirs(); File outputFile = new File(file, "xxxxxxxx.pdf"); OutputStream output = new FileOutputStream(outputFile); byte data[] = new byte[1024 * 1024]; long total = 0; int count; while ((count = input.read(data)) != -1) { total += count; if (total >= nextProgress) { nextProgress = (int) ((total / tickSize + 1) * tickSize); this.publishProgress((int) (total * 100 / fileLength)); } output.write(data, 0, count); } output.flush(); output.close(); input.close(); mProgressDialog.setProgress(0); mProgressDialog.dismiss(); } catch (Exception e) { } return null; } { } @Override protected void onPostExecute(String unused) { File file = new File(Environment.getExternalStorageDirectory() + "/Android/Data/" + getApplicationContext().getPackageName() + "/files/" + "xxxxxxxx.pdf"); Intent testIntent = new Intent(Intent.ACTION_VIEW); testIntent.setType("application/pdf"); Intent intent = new Intent(); intent.setAction(Intent.ACTION_VIEW); Uri uri = Uri.fromFile(file); intent.setDataAndType(uri, "application/pdf"); try { startActivity(intent); } catch (ActivityNotFoundException e) { Toast.makeText(atcChoice.this, "No PDF viewer is available, please download one from Play store", Toast.LENGTH_LONG).show(); } } } ```

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