Develop Reference

ProgressBar get Stucked at 0% while downloading file from server?

I am creating an Android application to download an mp3 file from
server. The downloading is working fine. But the ProgressBar is
stuck at 0% while downloading...
MainActivity.java
public class MainActivity extends Activity {
// button to show progress dialog
Button btnShowProgress;
// Progress Dialog
private ProgressDialog pDialog;
ImageView my_image;
// Progress dialog type (0 - for Horizontal progress bar)
public static final int progress_bar_type = 0;
// File url to download
private static String file_url = "http://eecindia.co.in/up/01%20-%20Pretham%20-%20Oruthikku%20Pinnil%20[Maango.me].mp3";
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// show progress bar button
btnShowProgress = (Button) findViewById(R.id.btnProgressBar);
// Image view to show image after downloading
my_image = (ImageView) findViewById(R.id.my_image);
/**
* Show Progress bar click event
* */
btnShowProgress.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// starting new Async Task
new DownloadFileFromURL().execute(file_url);
}
});
}
/**
* Showing Dialog
* */
#Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case progress_bar_type:
pDialog = new ProgressDialog(this);
pDialog.setMessage("Downloading file. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setMax(100);
pDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
pDialog.setCancelable(false);
pDialog.show();
return pDialog;
default:
return null;
}
}
/**
* Background Async Task to download file
* */
class DownloadFileFromURL extends AsyncTask<String, String, String> {
/**
* Before starting background thread
* Show Progress Bar Dialog
* */
#Override
protected void onPreExecute() {
super.onPreExecute();
showDialog(progress_bar_type);
}
/**
* 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);
// Output stream to write file
OutputStream output = new FileOutputStream("/sdcard/downloadedfile.mp3");
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
dismissDialog(progress_bar_type);
// Displaying downloaded image into image view
// Reading image path from sdcard
// String imagePath = Environment.getExternalStorageDirectory().toString() + "/downloadedfile.mp3";
// setting downloaded into image view
Toast.makeText(MainActivity.this, "Downloaded Succesfully.. check SD card 2 see file...", Toast.LENGTH_SHORT).show();
//my_image.setImageDrawable(Drawable.createFromPath(imagePath));
}
}
}

the above process works fine for image files but gets stuck for large files then you have to change this code in doinbackground method and see ..it works :)
HttpURLConnection connection = (HttpURLConnection)url.openConnection(); connection.setRequestMethod("HEAD");
connection.connect();
int length = connection.getContentLength();

Same file with same name getting downloaded even when provided with different URLs

I have a activity that contains a listview and sends different url when different list item is clicked via intent in onitemclicklistener
In the singleitemview activity which is opened when list item is clicked i have a button to download images
The problem is only 1 image is getting downloaded even different URLs are provided through different list item clicks
I think this is happening because of providing only 1 outputstream like this
OutputStream output = new FileOutputStream("/sdcard/download/loadedfile.png");
how to change this so each different image gets downloaded with its own file name
onitemclicklistener of listview
public void onItemClick(AdapterView<?> p1, View view, int position, long p4)
{
Intent intent = new Intent(ProActivity.this, SingleItemView.class);
intent.putExtra("download",
(codelist.get(position).getDownloadCode()));
staetActivity(intent);
}
My download class
class DownloadFileFromURL extends AsyncTask<String, String, String>
{
/**
* Before starting background thread
* Show Progress Bar Dialog
* */
#Override
protected void onPreExecute() {
super.onPreExecute();
showDialog(progress_bar_type);
}
/**
* 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("/sdcard/download/loadedfile.png");
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) {
//e.printStackTrace();
Log.e("Error: ","Error Message ::" + 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 downurl) {
// dismiss the dialog after the file was downloaded
dismissDialog(progress_bar_type);
Toast.makeText(SingleItemView.this,
getString(R.string.download_complete),
Toast.LENGTH_SHORT).show();
}
}
1
onclick method for my download button in singlitemview activity
Intent i = getIntent();
file_url = i.getStringExtra("download");
public void downloadnow(){
// different url is recived from different list item click via intent
String downurl = file_url;
new DownloadFileFromURL().execute(downurl);
}

Try to change file name loadedfile.png to downloaded file name.
Something like:
String fileName = url.substring( url.lastIndexOf('/')+1, url.length() );
OutputStream output = new FileOutputStream("/sdcard/download/" + filename);

No response when download button is clicked

I have a download button in my app which when pressed should download files from parse.com where I have stored the files. But when the button is clicked nothing happens the progress dailog disappear in fraction of seconds and the download is not performed.
The code
public class SingleItemView extends Activity
{
ProgressDialog mProgressDialog;
String heading;
String subHeading;
String levelImg;
String apiImg;
String apiText;
String descImgOne;
String descImgTwo;
String codeText;
ImageLoader imgloader = new ImageLoader(this);
private static String file_url;
private ProgressDialog pDialog;
ImageView my_image;
// Progress dialog type (0 - for Horizontal progress bar)
public static final int progress_bar_type = 0;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.singleitemview);
Intent i = getIntent();
heading= i.getStringExtra("heading");
subHeading = i.getStringExtra("subheading");
levelImg = i.getStringExtra("levelimg");
apiImg = i.getStringExtra("apiimg");
apiText = i.getStringExtra("apitext");
descImgOne = i.getStringExtra("descimgone");
descImgTwo = i.getStringExtra("descimgtwo");
codeText = i.getStringExtra("codetext");
file_url = i.getStringExtra("download");
TextView headingtxt = (TextView)findViewById(R.id.singleitemheading);
TextView subheadingtxt = (TextView)findViewById(R.id.singleitemsubheading);
TextView apitxt = (TextView)findViewById(R.id.singleitemviewapitext);
TextView codetxt = (TextView) findViewById(R.id.singleitemviewcodetext);
ImageView level =(ImageView) findViewById(R.id.levelimg);
ImageView api =(ImageView) findViewById(R.id.singleitemviewapiimg);
ImageView descone =(ImageView) findViewById(R.id.descriptionimgone);
ImageView desctwo =(ImageView) findViewById(R.id.descriptionimgtwo);
Button downloadbtn = (Button) findViewById(R.id.singleitemviewButton);
headingtxt.setText(heading);
subheadingtxt.setText(subHeading);
apitxt.setText(apiText);
codetxt.setText(codeText);
imgloader.DisplayImage(levelImg, level);
imgloader.DisplayImage(apiImg, api);
imgloader.DisplayImage(descImgOne, descone);
imgloader.DisplayImage(descImgTwo, desctwo);
downloadbtn.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v){
String downurl = file_url;
new DownloadFileFromURL().execute(downurl);
}
});
}
#Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case progress_bar_type: // we set this to 0
pDialog = new ProgressDialog(this);
pDialog.setMessage("Downloading file. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setMax(100);
pDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
pDialog.setCancelable(true);
pDialog.show();
return pDialog;
default:
return null;
}
}
class DownloadFileFromURL extends AsyncTask<String, String, String>
{
/**
* Before starting background thread
* Show Progress Bar Dialog
* */
#Override
protected void onPreExecute() {
super.onPreExecute();
showDialog(progress_bar_type);
}
/**
* 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("/sdcard/download/downloadedfile.png");
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) {
//e.printStackTrace();
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 downurl) {
// dismiss the dialog after the file was downloaded
dismissDialog(progress_bar_type);
}
}
}

Android: How to create a direct download link in android

Can anyone give me an idea on how to create a textview which has a link and when the user click it, the file from that link will be automatically downloaded by the device
EDIT:
here's the code were working on:
String link = "http://www.exampleurl.com/"+pref.getString("fsfile" + count, null);
link = link.replaceAll(" ", "%20");
fsfile.setText("Attached File");
fsfile.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// starting new Async Task
new DownloadFileFromURL().execute(link);
}
});
but it seems the String link is not identified inside the .setOnClickListener

Thats quite easy
http://developer.android.com/reference/android/app/DownloadManager.html
Example: http://androidtrainningcenter.blogspot.co.at/2013/05/android-download-manager-example.html
And start this method after clicking the textview (Catch with Handler or listener)
/**
* Start Download
*/
public void startDownload() {
DownloadManager mManager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
Request mRqRequest = new Request(
Uri.parse("http://androidtrainningcenter.blogspot.in/2012/11/android-webview-loading-custom-html-and.html"));
mRqRequest.setDescription("This is Test File");
// mRqRequest.setDestinationUri(Uri.parse("give your local path"));
long idDownLoad=mManager.enqueue(mRqRequest);
}
But be sure you are min. on API 9

Please use the below code onclick of TextView:
<Your TextView>.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// starting new Async Task
new DownloadFileFromURL().execute(<Your URL String>);
}
});
DownloadFromURL.java
public class DownloadFileFromURL extends AsyncTask<String, String, String> {
/**
* Before starting background thread
* Show Progress Bar Dialog
* */
#Override
protected void onPreExecute() {
super.onPreExecute();
showDialog(progress_bar_type);
}
/**
* 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);
// Output stream to write file
OutputStream output = new FileOutputStream("/sdcard/downloadedfile.jpg");
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
dismissDialog(progress_bar_type);
// Displaying downloaded image into image view
// Reading image path from sdcard
String imagePath = Environment.getExternalStorageDirectory().toString() + "/downloadedfile.jpg";
// setting downloaded into image view
my_image.setImageDrawable(Drawable.createFromPath(imagePath));
}
}

Handling exception when trying to download file from url with async in android

I am using a AsyncTask to download a file from a URL in Android.
This is the class to download the file in the background:
//-----------------------------ASYNC DOWNLOADER--------------------------------
/**
* Background Async Task to download file
* */
class DownloadFileFromURL extends AsyncTask<String, String, String> {
/**
* Before starting background thread
* Show Progress Bar Dialog
* */
#SuppressWarnings("deprecation")
#Override
protected void onPreExecute() {
super.onPreExecute();
showDialog(progress_bar_type);
}
//TODO Zustzinfos für alle Methoden hinzufügen
/**
* This method is called for executing the background task in the AsyncTask.
* For this tutorial we are only sleeping the thread for the number of
* seconds passed as parameter of the function.
*
* #param numSeconds: life of the task
* #return the result of the background task
*/
#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);
// Output stream to write file
OutputStream output = new FileOutputStream("/sdcard/"+Name+".xml");
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("ASYNC",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
* **/
#SuppressWarnings("deprecation")
#Override
protected void onPostExecute(String error) {
// dismiss the dialog after the file was downloaded
dismissDialog(progress_bar_type);
String xmlPath = Environment.getExternalStorageDirectory().toString() + "/"+Name+".xml";
Log.d("XMLDOWNLOADPATH", xmlPath);
Log.d("DOWNLOADXML","End Download XML file");
}
}
I want to be able to recognize in my main activity (the async class is a inner class of the main acticity) if there was a exception and show the error message in a Dialog or Toast.
I tried to return the value from doInBackground() to onPostExecute() and write this String to a global String variable like this:
protected String doInBackground(String... f_url) {
String error = null;
try {
}
catch(Exception e){
error = e.toString();
}
return error;
#Override
protected void onPostExecute(String error) {
globalStringvariable = error;
}
But this does not work properly, the dialog does not always show the exception message. Is this the best way to realize my problem?

e.getMessage();
That's what you're looking for.
Also note that if your getting null, it can be because you are catching Exception as a generic, you should always try to catch a specific Exception in order to get the message back.