How to Update My Android app From My Server?

How to Update My Android app From My Server? - java

Please help me to add update code to my app to be update from my server thank you
nothing worked from net , i need complete guide

You can't install your app without users permission and root access but you can download your applications new version from server then ask users for install. Here is an example:
{
PackageManager manager = context.getPackageManager();
try {
PackageInfo info = manager.getPackageInfo(context.getPackageName(), 0);
version = info.versionName;
if (newversion.replace(".", "") < version.replace(".", "")) {
new DownloadFileFromURL().execute("http://exampl.com/Content/files/example.apk");
}
} catch (PackageManager.NameNotFoundException e) {
e.printStackTrace();
}
}
private class DownloadFileFromURL extends AsyncTask<String, String, String> {
#Override
protected void onPreExecute() {
super.onPreExecute();
dialog = onCreateDialog();
}
#Override
protected String doInBackground(String... f_url) {
int count;
try {
File file = new File(Environment.getExternalStorageDirectory() + "/example.apk");
if (file.exists()) {
file.delete();
}
URL url = new URL(f_url[0]);
URLConnection conection = url.openConnection();
conection.connect();
int lenghtOfFile = conection.getContentLength();
pDialog.setMax(lenghtOfFile / 1024);
InputStream input = new BufferedInputStream(url.openStream(), 8192);
OutputStream output = new FileOutputStream(Environment.getExternalStorageDirectory() + "/example.apk");
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
publishProgress(total / 1024 + "");
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
} catch (Exception ignored) {
}
return null;
}
protected void onProgressUpdate(String... progress) {
pDialog.setProgress(Integer.parseInt(progress[0]));
}
#Override
protected void onPostExecute(String file_url) {
dialog.dismiss();
File file = new File(Environment.getExternalStorageDirectory() + "/example.apk");
if (file.exists()) {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
} else {
//finish() or whatever you want
}
}
}

Related

Trouble downloading photos

I wrote a program that
Download the photo from the url...
But I have a problem...
Some photos are downloaded.
And there is no problem.
But some of the pictures are not downloadable incompletely :(
and in the file manager I look at
it is broken
Can you help?
my code is:
public class DownloadFileFromURL_img extends AsyncTask {
private viewHolderPost holderPOST;
public DownloadFileFromURL_img(viewHolderPost holderPOST) {
Log.d(TAG, "DownloadFileFromURL_img: ");
this.holderPOST = holderPOST;
}
#Override
protected void onPreExecute() {
super.onPreExecute();
}
/**
* Downloading file in background thread
*/
#Override
protected String doInBackground(String... f_url) {
int count;
try {
File file = new File(Environment.getExternalStorageDirectory(), "98Diha/img");
if (!file.exists()) {
if (!file.mkdirs()) {
file.createNewFile();
}
}
InputStream input = null;
int response = -1;
URL url = new URL(f_url[0]);
URLConnection conection = url.openConnection();
if (!(conection instanceof HttpURLConnection))
throw new IOException("Not an HTTP connection");
try{
HttpURLConnection httpConn = (HttpURLConnection) conection;
httpConn.setAllowUserInteraction(false);
httpConn.setInstanceFollowRedirects(true);
httpConn.setRequestMethod("GET");
httpConn.connect();
response = httpConn.getResponseCode();
if (response == HttpURLConnection.HTTP_OK) {
input = httpConn.getInputStream();
}
}
catch (Exception ex)
{
throw new IOException("Error connecting");
}
int lenghtOfFile = conection.getContentLength();
input = new BufferedInputStream(url.openStream());
String imgS[] = f_url[0].split("/");
String name = imgS[imgS.length - 1];
String path = Environment
.getExternalStorageDirectory().toString()
+ "/98diha/img/" + name;
File filePath = new File(path);
if (!filePath.exists()) {
OutputStream output = new FileOutputStream(path);
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();
} else {
SSToast(context, "Exist!");
holderPOST.dowload_img.setVisibility(View.GONE);
holderPOST.setWallpaper.setVisibility(View.VISIBLE);
holderPOST.setWallpaper.setText(context.getString(R.string.set_wp));
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
holderPOST.setWallpaper.setTextColor(ContextCompat.getColor(context, R.color.Teal_400));
} else {
holderPOST.setWallpaper.setTextColor(context.getResources().getColor(R.color.Teal_400));
}
}
} catch (Exception e) {
Log.e("Error: ", e.getMessage());
}
return null;
}
/**
* Updating progress bar
*/
protected void onProgressUpdate(String... progress) {
holderPOST.dowload_img.setVisibility(View.GONE);
holderPOST.setWallpaper.setVisibility(View.VISIBLE);
holderPOST.setWallpaper.setText(context.getString(R.string.dowloading));
}
/**
* After completing background task Dismiss the progress dialog
**/
#Override
protected void onPostExecute(String file_url) {
holderPOST.setWallpaper.setText(context.getString(R.string.set_wp));
holderPOST.setWallpaper.setTextColor(context.getResources().getColor(R.color.Teal_400));
Log.d(TAG, "onPostExecute: ");
}
}

Instead of using AsyncTask to download images from URL. You can use libraries such as Glide or Picasso to do it quickly just in one line. But if you don't want to use libraries than you could use DownloadManager to download it and save it in a file. You can check this tutorial or other tutorials on the web for the implementation of DownloadManager.

Android how to download zip file using soap liabrary

I want to download zip file from server by using ksoap liabry.I am getting data in base64 please give solution that how to convert base64 and save it as zip file

byte[] bytes;
byte[] data = result.getBytes("UTF-8");
File outputFile = new File(mediaStorageDir.getAbsolutePath(), + "filename.zip");
new FileOutputStream(outputFile);
bytes = Base64.decode(data, Base64.DEFAULT);
File filepath = new File(Environment.getExternalStorageDirectory(), "Folder/" + "filename.zip");
OutputStream pdffos = new FileOutputStream(filepath);
pdffos.write(bytes);
pdffos.flush();
pdffos.close();

This Code help me to downlad apk and store to sd card.
This may help you also..
public class SaveInBackground extends AsyncTask<String,Integer,String> {
View v;
OutputValue ov;
Boolean isError= false;
public SaveInBackground(View v,OutputValue ov){
this.v = v;
this.ov = ov;
}
#Override
protected void onPreExecute(){
Message.setText("Downloading...");
isToLoop =true;
new Thread(new Runnable() {
#Override
public void run() {
while (isToLoop) {
SystemClock.sleep(500);
runOnUiThread(new Runnable() {
#Override
public void run() {
int count = bar.getProgress() + 1;
bar.setProgress(count);
}
});
if(isToLoop)
break;
}
}
}).start();
}
#Override
protected void onProgressUpdate(Integer... values) {
bar.setProgress(values[0]);
}
#Override
protected String doInBackground(String... params) {InputStream input = null;
OutputStream output = null;
HttpURLConnection connection = null;
try {
URL url = new URL(Globle.Infosoft_serverLink.replace("/Service.asmx/","")+ov.url);
connection = (HttpURLConnection) url.openConnection();
connection.connect();
if (connection.getResponseCode() != HttpURLConnection.HTTP_OK) {
isError = true;
return "Server returned HTTP " + connection.getResponseCode()
+ " " + connection.getResponseMessage();
}
int fileLength = connection.getContentLength();
input = connection.getInputStream();
//publishProgress(80);
String path = Environment.getExternalStorageDirectory()+"/"+ov.Name+".apk";
output = new FileOutputStream(path );
byte data[] = new byte[4096];
long total = 0;
int count;
while ((count = input.read(data)) != -1) {
total += count;
if (fileLength > 0) // only if total length is known
publishProgress((int) (total * 100 / fileLength));
output.write(data, 0, count);
}
return path;
}
catch (Exception e) {
isError =true;
Snackbar.make(v,"Error while accessing storage.",Snackbar.LENGTH_LONG).show();
return null;
}finally {
try {
if (output != null)
output.close();
if (input != null)
input.close();
} catch (IOException ignored) {
}
if (connection != null)
connection.disconnect();
}
}
#Override
protected void onPostExecute(String result){
if(!isError) {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(new File(result)), "application/vnd.android.package-archive");
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}
Message.setText("Downloaded");
reset(v);
}
}

Download mp4 from server and save it to sdcard

I simply want to download mp4 or .3gp files from server to android device. I have tried multiple ways to achieve but in some cases it gives IOException and some time give ProtocolException
First Method to download Video using DownloadVideoTask.class
public class DownloadVideoTask extends AsyncTask<String, Integer, Boolean>
{
String nameOfSong;
Context context;
Boolean flage = true;
ProgressDialog progressDialog2;
#SuppressLint("InlinedApi")
public DownloadVideoTask(Context context,String trackTitle)
{
this.context = context;
nameOfSong = trackTitle;
}
#Override
protected void onPreExecute()
{
super.onPreExecute();
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)
{
progressDialog2 = new ProgressDialog(context, AlertDialog.THEME_HOLO_LIGHT);
}
else
{
progressDialog2 = new ProgressDialog(context);
}
progressDialog2.setIndeterminate(false);
progressDialog2.setMax(100);
progressDialog2.setTitle("Please wait...");
try
{
progressDialog2.setMessage("Downloding.. " + nameOfSong.substring(0, 20));
}
catch (Exception e)
{
progressDialog2.setMessage("Downloding Song...." );
}
progressDialog2.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressDialog2.show();
}
#Override
protected Boolean doInBackground(String... params)
{
/* String trackTitle = params[0];
nameOfSong = trackTitle;
*/
String trackUrl = params[0];
try
{
File root;// = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
if(Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB)
{
root = Environment.getExternalStorageDirectory();
}
else
{
root = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
}
File dir = new File(root.getAbsolutePath() + "/XarDownloder");
if (dir.exists() == false)
{
dir.mkdirs();
}
URL url = new URL(trackUrl);
File file = new File(dir, nameOfSong);
URLConnection urlConnection = url.openConnection();
int fileLength = urlConnection.getContentLength();//ye statement inputStream k bad likhi thi
InputStream inputStream = urlConnection.getInputStream();
OutputStream outputStream = new FileOutputStream(
root.getAbsolutePath() + "/XarDownloder/" + nameOfSong
+ ".mp4");
byte data[] = new byte[1024];
long total = 0;
int count;
while ((count = inputStream.read(data)) != -1)
{
total += count;
// publishing the progress....
publishProgress((int) (total * 100 / fileLength));
outputStream.write(data, 0, count);
}
outputStream.flush();
outputStream.close();
inputStream.close();
try
{
if(Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB)
{
context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,
Uri.parse("file://"+ Environment.getExternalStorageDirectory())));
}
else
{
context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,Uri.parse("file://" + Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC))));
}
context.sendBroadcast(new Intent(
Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri
.fromFile(file)));
}
catch (Exception e)
{
}
return true;
}
catch (IOException e)
{
flage = false;
e.printStackTrace();
}
return false;
}
#Override
protected void onPostExecute(Boolean result)
{
super.onPostExecute(result);
if (result)
{
try
{
Toast.makeText(context,
nameOfSong.substring(0, 30) + "Downloaded...",
Toast.LENGTH_LONG).show();
}
catch (Exception e)
{
Toast.makeText(context,
"Song Downloaded...",
Toast.LENGTH_LONG).show();
}
}
else
{
Toast.makeText(context, "Sorry, song is not downloadable",
Toast.LENGTH_LONG).show();
}
progressDialog2.dismiss();
}
#Override
protected void onProgressUpdate(Integer... values)
{
super.onProgressUpdate(values);
progressDialog2.setProgress(values[0]);
}
}
Second Method using DownloadFile
public class DownloadFile extends AsyncTask<String, Integer, String>
{
String videoToDownload = "http://r2---sn-u2oxu-f5f6.googlevideo.com/videoplayback?expire=1438261718&fexp=901816,9405637,9407538,9407942,9408513,9408710,9409172,9413020,9414764,9414856,9414935,9415365,9415485,9416126,9416355,9417009,9417719,9418201,9418204&id=d813f7f3bef428da&mn=sn-u2oxu-f5f6&mm=31&mime=video/mp4&upn=82UaibRK7EM&itag=18&pl=24&dur=148.189&ip=167.114.5.145&key=yt5&ms=au&mt=1438239687&mv=u&source=youtube&ipbits=0&pcm2cms=yes&sparams=dur,id,ip,ipbits,itag,lmt,mime,mm,mn,ms,mv,pcm2cms,pl,ratebypass,source,upn,expire&lmt=1428049239028653&signature=39087CBD9BDC9EBD612CA0E8E82AC692B427FFE3.18C23CD0AEC8410CFBE4F35F532199DFF21E7DFA&ratebypass=yes&sver=3&signature=&title=How+To+Train+Your+Dragon+2+Official+Trailer+%231+%282014%29+-+Animation+Sequel+HD&filename=How_To_Train_Your_Dragon_2_Official_Trailer_1_2014__Animation_Sequel_HD.mp4";
public DownloadFile()
{
}
#Override
protected String doInBackground(String... params)
{
int count;
try
{
mp4load(videoToDownload);
}
catch (Exception e)
{
// TODO: handle exception
}
/*try
{
URL url = new URL(videoToDownload);
URLConnection conexion = url.openConnection();
conexion.connect();
// this will be useful so that you can show a tipical 0-100%
// progress bar
int lenghtOfFile = conexion.getContentLength();
// downlod the file
InputStream input = new BufferedInputStream(url.openStream());
OutputStream output = new FileOutputStream("/sdcard/xarwere/firstdownload.mp4");
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1)
{
total += count;
// publishing the progress....
publishProgress((int) (total * 100 / lenghtOfFile));
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
}
catch (Exception e)
{
e.printStackTrace();
}*/
return null;
}
public void mp4load(String urling)
{
try
{
URL url = new URL(urling);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setRequestMethod("GET");
//c.setDoOutput(true);
con.connect();
String PATH = Environment.getExternalStorageDirectory()
+ "/download/";
//Log.v(LOG_TAG, "PATH: " + PATH);
File file = new File(PATH);
file.mkdirs();
String fileName = "test.mp4";
File outputFile = new File(file, fileName);
if (!outputFile.exists())
{
outputFile.createNewFile();
}
FileOutputStream fos = new FileOutputStream(outputFile);
int status = con.getResponseCode();//my doctory
InputStream is = con.getInputStream();
byte[] buffer = new byte[1024];
int len1 = 0;
while ((len1 = is.read(buffer)) != -1) {
fos.write(buffer, 0, len1);
}
fos.close();
is.close();
}
catch (MalformedURLException e)
{
e.printStackTrace();
}
catch (ProtocolException e)
{
e.printStackTrace();
}
catch (IOException e1)
{
e1.printStackTrace();
}
}
}
Where videoToDownload in DownloadFile.class is the URLi want to download. but at inputStream it gives exception.
And I call these AsyncTask like
new DownloadFile().execute();
new DownloadVideoTask(TestingActivity.this, "nameofsong").execute("http://r2---sn-u2oxu-f5f6.googlevideo.com/videoplayback?expire=1438261718&fexp=901816,9405637,9407538,9407942,9408513,9408710,9409172,9413020,9414764,9414856,9414935,9415365,9415485,9416126,9416355,9417009,9417719,9418201,9418204&id=d813f7f3bef428da&mn=sn-u2oxu-f5f6&mm=31&mime=video/mp4&upn=82UaibRK7EM&itag=18&pl=24&dur=148.189&ip=167.114.5.145&key=yt5&ms=au&mt=1438239687&mv=u&source=youtube&ipbits=0&pcm2cms=yes&sparams=dur,id,ip,ipbits,itag,lmt,mime,mm,mn,ms,mv,pcm2cms,pl,ratebypass,source,upn,expire&lmt=1428049239028653&signature=39087CBD9BDC9EBD612CA0E8E82AC692B427FFE3.18C23CD0AEC8410CFBE4F35F532199DFF21E7DFA&ratebypass=yes&sver=3&signature=&title=How+To+Train+Your+Dragon+2+Official+Trailer+%231+%282014%29+-+Animation+Sequel+HD&filename=How_To_Train_Your_Dragon_2_Official_Trailer_1_2014__Animation_Sequel_HD.mp4");

I slighthly modified your code, but it downloads the file well. Did you add the internet permission?
public class DownloadFile extends AsyncTask<String, Integer, String> {
String videoToDownload = "http://r2---sn-u2oxu-f5f6.googlevideo.com/videoplayback?expire=1438261718&fexp=901816,9405637,9407538,9407942,9408513,9408710,9409172,9413020,9414764,9414856,9414935,9415365,9415485,9416126,9416355,9417009,9417719,9418201,9418204&id=d813f7f3bef428da&mn=sn-u2oxu-f5f6&mm=31&mime=video/mp4&upn=82UaibRK7EM&itag=18&pl=24&dur=148.189&ip=167.114.5.145&key=yt5&ms=au&mt=1438239687&mv=u&source=youtube&ipbits=0&pcm2cms=yes&sparams=dur,id,ip,ipbits,itag,lmt,mime,mm,mn,ms,mv,pcm2cms,pl,ratebypass,source,upn,expire&lmt=1428049239028653&signature=39087CBD9BDC9EBD612CA0E8E82AC692B427FFE3.18C23CD0AEC8410CFBE4F35F532199DFF21E7DFA&ratebypass=yes&sver=3&signature=&title=How+To+Train+Your+Dragon+2+Official+Trailer+%231+%282014%29+-+Animation+Sequel+HD&filename=How_To_Train_Your_Dragon_2_Official_Trailer_1_2014__Animation_Sequel_HD.mp4";
#Override
protected String doInBackground(String... params) {
int count;
try {
mp4load(videoToDownload);
} catch (Exception e) {
// TODO: handle exception
}
return null;
}
public void mp4load(String urling) {
try {
URL url = new URL(urling);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setRequestMethod("GET");
//c.setDoOutput(true);
con.connect();
String downloadsPath = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).getAbsolutePath();
String fileName = "test.mp4";
File outputFile = new File(downloadsPath, fileName);
if (!outputFile.exists()) {
outputFile.createNewFile();
}
FileOutputStream fos = new FileOutputStream(outputFile);
int status = con.getResponseCode();
InputStream is = con.getInputStream();
byte[] buffer = new byte[1024];
int len1 = 0;
while ((len1 = is.read(buffer)) != -1) {
fos.write(buffer, 0, len1);
}
fos.close();
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

Android - Get the original file name for an async download

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();
}
}
}

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);

Downloading pdf file and saving to SD card

I want to download and save pdf file to internal storage. Here is code that i am using:
I am calling my method from other class:
new Thread(new Runnable() {
public void run() {
new Main().downloadPdfContent("http://people.opera.com/howcome/2005/ala/sample.pdf");
}
}).start();
Method look like this:
public void downloadPdfContent(String urlToDownload){
URLConnection urlConnection = null;
try{
URL url = new URL(urlToDownload);
//Opening connection of currrent url
urlConnection = url.openConnection();
urlConnection.connect();
//int lenghtOfFile = urlConnection.getContentLength();
String PATH = Environment.getExternalStorageDirectory() + "/1/";
File file = new File(PATH);
file.mkdirs();
File outputFile = new File(file, "test.pdf");
FileOutputStream fos = new FileOutputStream(outputFile);
InputStream is = url.openStream();
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) {
// TODO: handle exception
e.printStackTrace();
}
}
I found link of pdf on the web:
http://people.opera.com/howcome/2005/ala/sample.pdf
However i get an exception on this line:
urlConnection.connect();
Exception:
java.net.UnknownHostException: people.opera.com
I can't figure out what's wrong. Maybe someone could take a look.
Thanks.

Put
<uses-permission android:name="android.permission.INTERNET"/>
in your AndroidManifest.xml

Follow following steps :
1) Declare file name
String fileName;
//for image
fileName = "matchfine1.png";
//for pdf
fileName = "samplepdf.pdf";
2) Call method to invoke download process.
startDownload(fileName);
3) Define startDownload method:
//for download file start
private void startDownload(String filename) {
String filedowname = filename;
//for image
String url = "http://farm1.static.flickr.com/114/298125983_0e4bf66782_b.jpg";
//for pdf
String url = "http://people.opera.com/howcome/2005/ala/sample.pdf";
new DownloadFileAsync().execute(url,filedowname);
}
4) For auto loading progressBar:
#Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case DIALOG_DOWNLOAD_PROGRESS:
mProgressDialog = new ProgressDialog(this);
mProgressDialog.setMessage("Downloading file..");
mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
mProgressDialog.setCancelable(false);
mProgressDialog.show();
return mProgressDialog;
default:
return null;
}
}
5) Define the download process extending AsyncTask
class DownloadFileAsync extends AsyncTask<String, String, String> {
#Override
protected void onPreExecute() {
super.onPreExecute();
showDialog(DIALOG_DOWNLOAD_PROGRESS);
}
#Override
protected String doInBackground(final String... aurl) {
try {
File root = android.os.Environment.getExternalStorageDirectory();
File dir = new File (root.getAbsolutePath() + "/Your_file_save_path/");
if(dir.exists()==false) {
dir.mkdirs();
}
URL url = new URL(aurl[0]);
String filename = aurl[1];
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(dir+"/"+filename);
byte data[] = new byte[1024];
long total = 0;
int count;
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;
}
protected void onProgressUpdate(String... progress) {
Log.d("ANDRO_ASYNC", progress[0]);
mProgressDialog.setProgress(Integer.parseInt(progress[0]));
}
#Override
protected void onPostExecute(String unused) {
dismissDialog(DIALOG_DOWNLOAD_PROGRESS);
}
}
//for download file end
6) Replace "Your_file_save_path" by your file path in dir. and then download and check in the specified location.

I have used the same code and got Network.onThreadException Error. But then after using this piece of code in my oncreate() method, I was able to resolve the issue.
if (android.os.Build.VERSION.SDK_INT > 9)
{
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}

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