Develop Reference

Get content length method (getContentLength()) of the URLConnection class returns negative 1 (-1)

Below is my AsyncTask to download a PDF file from CloudBoost database. The code works and downloads the file; however, what does not work is the progress bar update because the file length returned is -1. Can someone give me a tip on how I can deal with this.
By the way loading.setProgress(progress[0]); line in the the progress update method is being initialized at the top of the class that this AsyncTask class is nested in.
class DownloadPdfFromInternet extends AsyncTask<String, Integer, String> {
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected String doInBackground(String... strings) {
int count;
try {
URL url = new URL(strings[0]);
URLConnection connection = url.openConnection();
connection.connect();
// get length of file
int lengthOfFile = connection.getContentLength();
Log.d("dozer74", "LengthOf File: " + lengthOfFile);
InputStream input = new BufferedInputStream(url.openStream(), 10 * 1024);
OutputStream output = new FileOutputStream(Environment.getExternalStorageDirectory().getPath() + "/" + pubName);
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
publishProgress((int) (total * 100 / lengthOfFile));
// write data to file
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
} catch (Exception e) {
Log.e("Error: ", e.getMessage());
}
return null;
}
protected void onProgressUpdate(Integer... progress) {
loading.setProgress(progress[0]);
}
#Override
protected void onPostExecute(String url) {
loading.dismiss();
openPdfFile();
}
}

How to hide the browser when downloading files from online

I am trying to download a file from an online source of mine. The issue I am having is that the browser window keeps appearing as it load into the download server. Is there some way that I may be able to hide this? I already have this code below in the doInBackground portion of an AsyncTask, but cant seem to get it to hide the browser bar. Here is my code at this point:
private class getErDone extends AsyncTask<Void, Void, Void>{
#Override
protected void onPreExecute() {
ProgressDialog progressDialog = new ProgressDialog(getApplicationContext());
progressDialog.setTitle("Downloading Software");
progressDialog.setMessage("Now Updating, DO NOT TURN OFF DEVICE");
progressDialog.setCancelable(false);
super.onPreExecute();
}
#Override
protected Void doInBackground(Void... params) {
try{
Intent goToMarket = new Intent(Intent.ACTION_VIEW)
.setData(Uri.parse("http://mydownloadlink.com/myfile?dl=1"));
//**Note** As convincing as it seems, this is not the real download link
startActivity(goToMarket);
}catch (UnknownError e){
e.printStackTrace();
}
/*catch (MalformedURLException e){
e.printStackTrace();
}catch (IOException t){
t.printStackTrace();
}*/
return null;
}
#Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
}
}
Thanks everyone!

here is sample from my code, download without browser:
private TextView mFileDownloadProgressBarPercent;
private ProgressBar mFileDownloadProgressBar;
private Runnable mFileExecutionTaskAfterDownload;
public String fileDownloadedResultPath;
and asynctask:
class DownloadFileFromURL extends AsyncTask<String, String, String> {
// Before starting background thread
// Show Progress Bar Dialog
#Override
protected void onPreExecute() {
super.onPreExecute();
if(mFileDownloadProgressBar != null)
mFileDownloadProgressBar.setVisibility(View.VISIBLE);
if(mFileDownloadProgressBarPercent != null)
mFileDownloadProgressBarPercent.setVisibility(View.VISIBLE);
}
// Downloading file in background thread
#Override
protected String doInBackground(String... f_url) {
int count;
try {
URL url = new URL(f_url[0]);
URLConnection conection = url.openConnection();
conection.connect();
// getting file length
int lenghtOfFile = conection.getContentLength();
// input stream to read file - with 8k buffer
InputStream input = new BufferedInputStream(url.openStream(), 8192);
String extStorageDirectory = Environment.getExternalStorageDirectory()
.toString();
File folder = new File(extStorageDirectory, "pdf"); // for example we are downloading pdf's so store in pdf dir.
folder.mkdir();
File subFolder = new File(extStorageDirectory+"/pdf", "fileId"); // here you can place files by id of category etc..
subFolder.mkdir();
String fileName = url.toString().substring(url.toString().lastIndexOf("/")+1);
fileDownloadedResultPath = subFolder + "/" + fileName;
// Output stream to write file
OutputStream output = new FileOutputStream(subFolder + "/" + fileName);
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
publishProgress(""+(int)((total*100)/lenghtOfFile));
// writing data to file
output.write(data, 0, count);
}
// flushing output
output.flush();
// closing streams
output.close();
input.close();
} catch (Exception e) {
Log.e("Error: ", e.getMessage());
}
return null;
}
protected void onProgressUpdate(String... progress) {
if(mFileDownloadProgressBar != null)
mFileDownloadProgressBar.setProgress(Integer.parseInt(progress[0]));
if(mFileDownloadProgressBarPercent != null)
mFileDownloadProgressBarPercent.setText(mContext.getString(R.string.downloading_file) + " " + String.format("%s%%",Integer.parseInt(progress[0])+""));
}
#Override
protected void onPostExecute(String file_url) {
if(mFileDownloadProgressBar != null)
mFileDownloadProgressBar.setVisibility(View.GONE);
if(mFileDownloadProgressBarPercent != null)
mFileDownloadProgressBarPercent.setVisibility(View.GONE);
if(mFileExecutionTaskAfterDownload != null)
mFileExecutionTaskAfterDownload.run();
}
}

Android , Check if the file transfer has been successful

I have an android app which downloads a video by clicking a button and saves it on user's device. when users click on the button the app checks if the video is in users' device, and if it is not it downloads the video and if it has been downloaded the app just plays the video without the need to download.
However when the download crashes the file is there , but the app can't plays it and gets tricked that the file has been downloaded already.
I wanted to ask if there are any ways to check if the download process has crashed or the file is corrupted.
Thanks

You can use AsyncTask as below to check if the download was interupted or not.
Below code is just for example purpose
class DownloadFileFromURL extends AsyncTask<String, String, String> {
#Override
protected void onPreExecute() {
super.onPreExecute();
initialText.setText(getString(R.string.connecting));
}
#Override
protected String doInBackground(String... f_url) {
int count;
try {
String fileURL = f_url[0];
if (fileURL.contains(" ")) {
fileURL = fileURL.replace(" ", "%20");
}
URL url = new URL(fileURL);
filename = f_url[0].substring(fileURL.lastIndexOf("/") + 1);
URLConnection connection = url.openConnection();
connection.connect();
// getting file length
int lengthOfFile = connection.getContentLength();
// input stream to read file - with 8k buffer
InputStream input = new BufferedInputStream(url.openStream(), 8192);
File file = new File(FilePath);
if (!file.exists()) {
if (!file.isDirectory()) {
file.mkdirs();
}
}
// Output stream to write file
OutputStream output = new FileOutputStream(FilePath + filename);
byte data[] = new byte[1024];
long total = 0;
runOnUiThread(new Runnable() {
#Override
public void run() {
setSubTitle(getString(R.string.downloading));
initialText.setText(ad_tv_initialText.getText().toString() + getString(R.string.connected));
}
});
while ((count = input.read(data)) != -1) {
total += count;
// publishing the progress....
// After this onProgressUpdate will be called
publishProgress("" + (int) ((total * 100) / lengthOfFile));
// writing data to file
output.write(data, 0, count);
}
// flushing output
output.flush();
// closing streams
output.close();
input.close();
return "SUCCESS";
} catch (Exception e) {
return "FAILED";
}
}
protected void onProgressUpdate(String... progress) {
progress.setProgress(Integer.parseInt(progress[0]));
progressText.setText(progress[0] + " %");
}
#Override
protected void onPostExecute(String result) {
if (result.equals("SUCCESS")) {
takeDecisionToPlay();
} else if (result.equals("FAILED")) {
setSubTitle(getString(R.string.failed_));
finalText.setText(getString(R.string.failed));
}
}
}

Download docx file from url android

i want to download file from url. http://opengov.dev.ifabrika.ru/upload/435/IF_Заявка_Программист PHP_2013-09-03.docx - you can try it, it work. My code is next:
new DownloadFileFromURL().execute("http://opengov.dev.ifabrika.ru/upload/435/IF_Заявка_Программист PHP_2013-09-03.docx");
DownloadFileFromUrl is
class DownloadFileFromURL extends AsyncTask<String, String, String> {
private ProgressDialog pDialog;
public static final int progress_bar_type = 0;
/**
* Before starting background thread Show Progress Bar Dialog
*/
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(PostInfoActivity.this);
pDialog.setMessage("Downloading file. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setMax(100);
pDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Downloading file in background thread
*/
#Override
protected String doInBackground(String... f_url) {
int count;
try {
URL url = new URL(f_url[0]);
URLConnection conection = url.openConnection();
conection.connect();
// this will be useful so that you can show a tipical 0-100%
// progress bar
int lenghtOfFile = conection.getContentLength();
// download the file
InputStream input = new BufferedInputStream(url.openStream(),
8192);
// Output stream
OutputStream output = new FileOutputStream(Environment
.getExternalStorageDirectory().toString()
+ "/test.docx");
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
// publishing the progress....
// After this onProgressUpdate will be called
publishProgress("" + (int) ((total * 100) / lenghtOfFile));
// writing data to file
output.write(data, 0, count);
}
// flushing output
output.flush();
// closing streams
output.close();
input.close();
} catch (Exception e) {
Log.e("Error: ", e.getMessage());
}
return null;
}
/**
* Updating progress bar
*/
protected void onProgressUpdate(String... progress) {
// setting progress percentage
pDialog.setProgress(Integer.parseInt(progress[0]));
}
/**
* After completing background task Dismiss the progress dialog
* *
*/
#Override
protected void onPostExecute(String file_url) {
// dismiss the dialog after the file was downloaded
if (pDialog != null) {
pDialog.dismiss();
}
}
}
After this a saw new test.docx file in my root folder, but its size is 26 byte and i can not open it.

This happening because your url is in unicoded form so you have to first encode it then try to download
URLEncoder.encode(Url, "UTF-8")
It works for me.

You can try with this method by calling this method from your doInBackground
private void downloader(String urlstr) {
HttpURLConnection c = null;
FileInputStream fis = null;
FileOutputStream fbo = null;
File file = null, file1;
File outputFile = null;
InputStream is = null;
URL url = null;
try {
outputFile = new File(Environment
.getExternalStorageDirectory().toString()
+ "/test.docx");
if(outputFile.exists())
Log.e("File delete",outputFile.delete()+"");
fbo = new FileOutputStream(outputFile, false);
// connect with server where remote file is stored to download it
url = new URL(urlstr);
c = (HttpURLConnection) url.openConnection();
c.setRequestMethod("GET");
c.setDoOutput(true);
c.setConnectTimeout(0);
c.connect();
is = c.getInputStream();
byte[] buffer = new byte[1024];
int len1 = 0;
while ((len1 = is.read(buffer)) != -1) {
fbo.write(buffer, 0, len1);
Log.e("length", len1+"----");
}
fbo.flush();
} catch (Exception e) {
} finally {
if (c != null)
c.disconnect();
if (fbo != null)
try {
fbo.close();
} catch (IOException e) {
e.printStackTrace();
}
if (is != null)
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
file = null;
outputFile = null;
}
}

I think Problem is you used only URLConnection class instead of HttpUrlConnection class. refer below link
Download a file with Android, and showing the progress in a ProgressDialog

Hey I have checked your link which you got after encoding...The Problem here is the + character which replaced the white space http://opengov.dev.ifabrika.ru/upload/435/IF_Заявка_Программист+PHP_2013-09-03.docx.....TO resolve this issue replace your + character with %20 and then try....This will definitely work... and you can also do that before encoding i.e replace your white space with %20...so the final link should be like http://opengov.dev.ifabrika.ru/upload/435/IF_Заявка_Программист%20PHP_2013-09-03.docx

Saving to internal storage using existing code - Android

I would rather my application save the required text file in the internal storage for the app than the users /sdcard/ so there isn't files being created which may annoy them at some point. Could someone direct me on how to change my code so the text file is saved internally rather than externally.
public void updatebutton(View v){
startDownload();
}
private void startDownload() {
String url = "http://nowactivity.webs.com/teststring.txt";
Toast.makeText(this, "Updating", Toast.LENGTH_LONG);
new DownloadFile().execute(url);
}
class DownloadFile extends AsyncTask<String, String, String> {
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected String doInBackground(String... aurl) {
int count;
try {
URL url = new URL(aurl[0]);
URLConnection conexion = url.openConnection();
conexion.connect();
int lenghtOfFile = conexion.getContentLength();
Log.d("ANDRO_ASYNC", "Lenght of file: " + lenghtOfFile);
InputStream input = new BufferedInputStream(url.openStream());
OutputStream output = new FileOutputStream("/sdcard/textfile.txt");
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
publishProgress(""+(int)((total*100)/lenghtOfFile));
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
} catch (Exception e) {}
return null;
}

I think what you want is Context.openFileOutput(). (Activity extends Context, so you could call this from within an Activity, for instance.)
Incidentally, you should use Environment.getExternalStorageDirectory() instead of something like "/sdcard"