Develop Reference

Trying to add Notification Builder in AsyncTask

Someone helps me out Pls
I wanted to implement a notification builder in my AsyncTask method for downloading files from the server. Notification that contains progress bar with incrementing base on file length, show download percentage and how many MB remain, with pause and resume, I try it but still notification not showing while downloading is doing in the background there is my code:
class DownloadFileFromURL extends AsyncTask<String, String, String> {
#Override
protected void onPreExecute() {
super.onPreExecute();
showDialog(progress_bar_type);
}
#Override
protected String doInBackground(String... f_url) {
int count;
try {
URL url = new URL(f_url[0]);
URLConnection conection = url.openConnection();
conection.connect();
int lenghtOfFile = conection.getContentLength();
InputStream input = new BufferedInputStream(url.openStream(), 8192);
String folder = "/data/data/" + getPackageName() + "/files/";
File directory = new File(folder);
if (!directory.exists()) {
directory.mkdirs();
}
OutputStream output = new FileOutputStream(folder + getIntent().getStringExtra("title") + ".mp4");
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) {
Log.e("Error: ", e.getMessage());
}
return null;
}
protected void onProgressUpdate(String... progress) {
pDialog.setProgress(Integer.parseInt(progress[0]));
}
#Override
protected void onPostExecute(String file_url) {
dismissDialog(progress_bar_type);
String type = "downloads";
Update(type);
View layout = getLayoutInflater().inflate(R.layout.toast_custom, findViewById(R.id.custom_toast_layout_id));
TextView text = layout.findViewById(R.id.text);
text.setText(getIntent().getStringExtra("title") + " - Downloaded Successfully!");
Toast toast = new Toast(getApplicationContext());
toast.setDuration(Toast.LENGTH_LONG);
toast.setView(layout);
toast.show();
}
}

Where is the code to show Notification and which android version os are you using ?

Return onPostExecute Value into onBindViewHolder of RecyclerAdapter

I have chat screen where i am downloading attachment from FirebaeStorage.
I have various formats of file which can be send doc,pdf,apk etc. and for each i have same TextViews and ImageViews.
In Chat screen's recyclerview adapter i am setting file path of local storage which can be obtain by run AsyncTask which downloads files from Firebase Storage and return file path.This work perfectly but the issue is how to get back that file path in onBindViewHolder on particular if else
Here is my RecyclerAdapter where i am calling AsyncTask and need result back into same scope and wait till download completes then set views according to data returned
public void onBindViewHolder(final Chat_Adapter.ViewHolder holder, int position) {
if (fileType.equals("pdf")){
new DownloadFileFromFS(Download_URL,FileName+".pdf").execute();
//HERE I NEED THE RESULT FROM ASYNCTASK AND WAIT TILL DOWNLOAD COMPLETES
//THEN SET THE VIEWS WITH RETURN RESULT FROM ASYNCTASK
if (DownloadFilePath!=null){
File file=new File(DownloadFilePath);
long sizeFile=file.length()/1024; //In KB
holder.Doc_FileName.setText(DownloadFilePath);
holder.Doc_FileSize.setText(String.valueOf(sizeFile));
}
else {
Log.d(TAG,"DOWNLOAD FILE PATH IS NULL");
}
}
AsyncTask
public class DownloadAttachment extends AsyncTask<Void, String, String> {
String DownloadUrl,fileName;
File file;
Context context;
ProgressBar progressBar;
public static final String TAG="###Download Attachment";
public DownloadAttachment(Context context, String downloadUrl, String fileName) {
DownloadUrl = downloadUrl;
this.fileName = fileName;
this.context=context;
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
}
#Override
protected String doInBackground(Void... params) {
int count;
try {
File root = android.os.Environment.getExternalStorageDirectory();
Log.d(TAG,"DO IN BACKGROUND RUNNING");
File dir = new File(root.getAbsolutePath() + "/Downloaded Files/");
if (dir.exists() == false) {
dir.mkdirs();
}
URL url = new URL(DownloadUrl); //you can write here any link
file = new File(dir, fileName);
long startTime = System.currentTimeMillis();
Log.d(TAG, "download begining");
Log.d(TAG, "download url:" + url);
Log.d(TAG, "downloaded file name:" + fileName);
/* Open a connection to that URL. */
URLConnection ucon = url.openConnection();
//this will be useful so that you can show a typical 0-100% progress bar
int lengthOfFile=ucon.getContentLength();
/*
* Define InputStreams to read from the URLConnection.
*/
InputStream is = ucon.getInputStream();
BufferedInputStream bis = new BufferedInputStream(is);
/*
* Read bytes to the Buffer until there is nothing more to read(-1).
*/
ByteArrayOutputStream baf = new ByteArrayOutputStream(5000);
int current = 0;
long total=0;
while ((current = bis.read()) != -1) {
baf.write((byte) current);
total=total+current;
//PUBLISH THE PROGRESS
//AFTER THIS onProgressUpdate will be called
publishProgress(""+(int)(total*100)/lengthOfFile);
}
/* Convert the Bytes read to a String. */
FileOutputStream fos = new FileOutputStream(file);
fos.write(baf.toByteArray());
fos.flush();
fos.close();
Log.d("DownloadManager", "download ready in " + ((System.currentTimeMillis() - startTime) / 1000) + " sec");
Log.d(TAG,"File Path "+file);
} catch (IOException e) {
Log.d("DownloadManager", "Error: " + e);
}
return file.toString();
}
}
UPDATE As #Atef Hares suggest,i did implement in code.its working fine but what if i have different format. How to call particular if else after getting result from asynctask cuz code suggested only call pdf if statement.
if (fileType.equals("pdf")){
final String nameFile=UUID.randomUUID().toString();
new DownloadFileFromFS(chat_wrapper.getDocuments(),nameFile).execute();
filePathInterface=new FilePath() {
#Override
public void LocalFilePath(final String Path) {
//HERE I AM GETTING RESULT FROM ASYNCTASK
//AND SETTING VIEWS ACCORDING TO IT
}
};
}
else if (fileType.equals("doc")){
//HOW TO GET RESULT FROM ASYNCTASK HERE IF FILETYPE IS "doc"
}
else if (fileType.equals("ppt")){
//HOW TO GET RESULT FROM ASYNCTASK HERE IF FILETYPE IS "ppt"
}

Okay using interfaces -as you know- will achieve what you need!
just do it like this:
public interface AsyncTaskCallback {
void onSuccess (String filePath);
}
and in the Adapter, don't set any data to the view unless you got the data back from asyncTask, like this:
public void onBindViewHolder(final Chat_Adapter.ViewHolder holder, int position) {
//Initialize filetype here
new DownloadFileFromFS(Download_URL, FileName + "."+ filetype, new AsyncTaskCallback() {
#Override
public void onSuccess(String filePath) {
//HERE I NEED THE RESULT FROM ASYNCTASK AND WAIT TILL DOWNLOAD COMPLETES
//THEN SET THE VIEWS WITH RETURN RESULT FROM ASYNCTASK
if (filePath != null) {
File file = new File(filePath);
long sizeFile = file.length() / 1024; //In KB
holder.Doc_FileName.setText(filePath);
holder.Doc_FileSize.setText(String.valueOf(sizeFile));
} else {
Log.d(TAG, "DOWNLOAD FILE PATH IS NULL");
}
}
}).execute();
}

You could use a callback.
public interface FileDownloadCallback {
void onSuccess (String filePath);
void onFailed ();
}
Pass that in to your AsyncTask and call it from onPostExecute.

AWS Unable to calculate MD5 hash Android

I am uploading image file to S3 via the AWS java SDK, but i am getting the below error while uploading , i have checked my credentials and my bucket they are fine
Unable to calculate MD5 hash: /data/user/0/competent.groove.feetport/files/data/user/0/competent.groove.feetport/app_imageDir/IMG_20161122_073058.jpg: open failed: ENOENT (No such file or directory)
I am capturing the image from camera and saving the image in phone , here is my code
#Override
public void onPictureTaken(CameraView cameraView, final byte[] data) {
Log.d(TAG, "onPictureTaken " + data.length);
//Toast.makeText(cameraView.getContext(), R.string.picture_taken, Toast.LENGTH_SHORT) .show();
getBackgroundHandler().post(new Runnable() {
#Override
public void run() {
// This demo app saves the taken picture to a constant file.
// $ adb pull /sdcard/Android/data/com.google.android.cameraview.demo/files/Pictures/picture.jpg
///storage/7A52-13E8/Android/data/competent.groove.feetport/files/Pictures/picture.jpg
//make a new picture file
File pictureFile = getOutputMediaFile();
if (pictureFile == null) {
Toast toast = Toast.makeText(getActivity(), "Picture Not saved", Toast.LENGTH_LONG);
toast.show();
return;
}
try {
//write the file
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
Toast toast = Toast.makeText(getActivity(), "Picture saved: " + pictureFile.getName(), Toast.LENGTH_LONG);
toast.show();
Log.e("-pictureFile--length-----",""+pictureFile.length());
Log.e("---pictureFile-----"+pictureFile.getName(),""+pictureFile.getAbsolutePath());
Log.e("-fileName--",""+fileName);
editor = sharedPref.edit();
editor.putString(Constants.PIC_PATH,""+fileName);
editor.commit();
} catch (FileNotFoundException e) {
} catch (IOException e) {
}
}
});
}
};
String fileName="";
//make picture and save to a folder
private File getOutputMediaFile() {
//make a new file directory inside the "sdcard" folder
/* File mediaStorageDir = new File("/sdcard/", "JCG Camera");
//if this "JCGCamera folder does not exist
if (!mediaStorageDir.exists()) {
//if you cannot make this folder return
if (!mediaStorageDir.mkdirs()) {
return null;
}
}*/
String extStorageDirectory = Environment.getExternalStorageDirectory().toString();
ContextWrapper cw = new ContextWrapper(getActivity());
File directory = cw.getDir("imageDir", Context.MODE_PRIVATE);
Log.e("---directory-----", "" + directory);
//take the current timeStamp
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
File mediaFile;
///data/user/0/competent.groove.biometric/files/IMG_20160803_181740.jpg
//and make a media file:
fileName = directory + File.separator + "IMG_" + timeStamp + ".jpg";
mediaFile = new File(directory + File.separator + "IMG_" + timeStamp + ".jpg");
Log.e("---extStorageDirectory-----", "" + extStorageDirectory);
//Log.e("---mediaFile-----",""+mediaFile.length());
//Log.e("---mediaFile-----"+mediaFile.getName(),""+mediaFile.getAbsolutePath());
return mediaFile;
}
and my aws code to upload file is
public class UploadAws extends AsyncTask{
private int total, percentage = 0;
Context context;
String s3_server_path = "";
ObscuredSharedPreferences shrdpref;
ObscuredSharedPreferences.Editor editor;
String res = "";
public UploadAws(Context context){
Log.e(""+getClass(), "UploadAws constructor called");
this.context = context;
shrdpref = new ObscuredSharedPreferences(context, context.getSharedPreferences(Constants.PREFERENCES, Context.MODE_PRIVATE));
}
#Override
protected Object doInBackground(Object... params) {
try {
Log.d("" + getClass(), "UploadAws doInBackground called");
File pictures = null;
AmazonS3Client s3Client = null;
TransferUtility tx = null;
percentage = 0;
try {
s3_server_path = shrdpref.getString(Constants.PIC_PATH,"");
File dir = context.getFilesDir();
pictures = new File(dir, s3_server_path);
s3Client = new AmazonS3Client(new BasicAWSCredentials(shrdpref.getString(Constants.AWS_Access_Key,""),shrdpref.getString(Constants.AWS_Secret_Key,"")));
tx = new TransferUtility(s3Client,context);
} catch (NullPointerException e) {
e.printStackTrace();
}
try {
Log.e("------File length--------=", "" + pictures.length());
Log.e("------File getName--------=", "" + pictures.getName());
Log.e("------File getAbsolutePath--------=", "" + pictures.getAbsolutePath());
s3Client.setEndpoint("s3.amazonaws.com");
String Feetport_bucket = shrdpref.getString(Constants.fs_bucket, "");
if (s3Client.doesBucketExist(Feetport_bucket)) {
Log.e("Warn", "service called bucket exist");
} else {
s3Client.createBucket(Feetport_bucket);
Log.e("FOS signature", "Bucket created");
}
int imageIndex = pictures.toString().lastIndexOf("/");
String pictureString = pictures.toString().substring(imageIndex + 1, pictures.toString().length());
String selfie_url = "FeetPort/" + shrdpref.getString(Constants.company_name, "") + "/attend/" + Utils.getCurrentDate() + "/" + pictureString;
Log.d("UploadAws selfie_url called: ", "" + selfie_url);
//https://feetport.s3.amazonaws.com/8632/17/20161122/mayank1_I_1624_065610_COL22.jpeg
final TransferObserver observer = tx.upload(Feetport_bucket, pictures.getName(), pictures);
observer.setTransferListener(new TransferListener() {
#Override
public void onStateChanged(int arg0, TransferState state) {
Log.e("onStateChanged", "on state changed " + state);
}
#Override
public void onProgressChanged(int id, long bytesCurrent, long bytesTotal) {
Log.e("onProgressChanged", "total bytes " + observer.getBytesTotal());
Log.e("onProgressChanged", "total bytes transfered " + observer.getBytesTransferred());
percentage = (int) (bytesCurrent / bytesTotal * 100);
Log.e("onProgressChanged", "total percentage " + percentage);
}
#Override
public void onError(int arg0, Exception arg1) {
Log.e("onError=" + arg0, "on Error " + arg1.toString());
percentage = 101;
}
});
do {
} while (percentage < 100);
Log.e("percentage", "percentage " + percentage);
if (percentage == 100) {
/**
* CGPL-17 9-5-2016 dynamic bucket and url.
*/
String S3_SERVER = "https://".concat(Feetport_bucket).concat(".s3.amazonaws.com/");
String imageUrl = S3_SERVER + selfie_url;
//Session.setselfie_url(shrdpref, imageUrl);
editor = shrdpref.edit();
editor.putString(Constants.PIC_PATH, "" + imageUrl);
editor.commit();
Log.e("Selfie url ", "imageUrl --- " + imageUrl);
/*JsonParameters object = new JsonParameters(context);
object.markedAttendance(callback);*/
} else {
/*JsonParameters object = new JsonParameters(context);
object.markedAttendance(callback);*/
}
} catch (Exception e) {
e.printStackTrace();
}
} catch (Exception exception) {
exception.printStackTrace();
}
return null;
}
}

This isn't anything related to S3.
ENOENT (No such file or directory) is a local error: file not found.
Take a very close look at the path in the error message. I've included the path here, and added some line breaks for readability. I did not otherwise edit this, and, importantly, I did not paste any of it here more than once:
/data/user/0
/competent.groove.feetport
/files/data/user/0
/competent.groove.feetport
/app_imageDir/IMG_20161122_073058.jpg
I'm not saying that this is wrong, but it certainly looks wrong. It certainly looks like you're trying to upload the file from a path that you have incorrectly constructed, with some duplication in the directory structure... and there's no such directory, no such file.

How to create a data folder for my application?

I wrote this code for downloading some files in my android application but now downloaded files are in the root without any special order and it looks very bad! So I want to know how can I add a folder for my application's downloaded files?
A code line to explain the path of output :
OutputStream output = new FileOutputStream(Environment.getExternalStorageDirectory() + "/" + downloadedfileName);
And here is my code:
private class DownloadFileFromURL extends AsyncTask<String, String, String> {
private String downloadedfileName;
private ProgressDialog pDialog;
#Override
protected void onPreExecute() {
super.onPreExecute();
Toast.makeText(getApplicationContext(), "بارگذاری...", Toast.LENGTH_SHORT).show();
pDialog = new ProgressDialog(DownloadActivity.this);
pDialog.setMessage("کتاب در حال بارگذاري، لطفا منتظر بمانيد...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
#Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
pDialog.dismiss();
AlertDialog.Builder builder = new AlertDialog.Builder(DownloadActivity.this)
.setTitle("دانلود کتاب با موفقیت انجام شد")
.setMessage("از دانلود شما سپاس‌گذاریم.")
.setNeutralButton("خواهش میکنم", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface arg0, int arg1) {
Intent i = new Intent(DownloadActivity.this, LibActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
DownloadActivity.this.startActivity(i);
DownloadActivity.this.finish();
}
});
builder.create().show();
}
public void setDownloadedFileName(String downloadedfileName){
this.downloadedfileName = downloadedfileName;
}
/**
* Downloading file in background thread
* */
#Override
protected String doInBackground(String... surl) {
int count;
try {
URL url = new URL(surl[0]);
URLConnection conection = url.openConnection();
conection.connect();
// this will be useful so that you can show a typical 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()
// + "/data/" + downloadedfileName);
OutputStream output = new FileOutputStream(Environment.getExternalStorageDirectory() + "/ketabha/" + downloadedfileName);
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;
}
}

Just as simple change this to your favorite directory:
OutputStream output = new FileOutputStream(Environment.getExternalStorageDirectory() + "/ANYFOLDER/ANOTHERFOLDER/" + downloadedfileName);
And remember that in the first create that directory with this code:
File dir = new File(yourdirectory);
if(!dir.exists()){
dir.mkdirs();
}
Above code work if you added related manifest in your AndroidManifest.xml file:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
and for more information see below links:
How to create directory automatically on SD card
Create folder in Android
can't create a folder in external storage on android device

How to cancel an AsyncTask after it has been executed?

I use AsyncTask with Progress Dialog for downloading a database from a server. I want to provide user with an option of cancellation the downloading task.
My purpose is to dismiss Progress Dialog and cancel AsyncTask when user click on Cancel button on Progress Dialog.
I have applied numerous code examples but they help to dismiss Progress Dialog only and fail to stop or cancel the downloading task.
Regarding my code lines below, can you please give a little help? Many thanks.
EDITED VERSION
public class Download_gram extends Activity {
// File url to download
private static String url = "https://dl.dropbox.com/u/15034088/Anhroid_Dict/grammar.nvk.zip";
private static DownloadFile newTask;
// Progress Dialog
private ProgressDialog progressDialog;
// Progress dialog type (0 - for Horizontal progress bar)
public static final int progress_bar = 0;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.download_gram);
newTask = new DownloadFile();
startDownload_gram = (Button) findViewById(R.id.btnProgressBar_gram);
//start download event and show progress bar
startDownload_gram.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//Checi if file exists
File fgram = new File(Environment.getExternalStorageDirectory()+"/my_Folder/db/my_file/my_file.nvk");
if(fgram.exists())
{
Toast.makeText(getApplicationContext(), "File installed.", Toast.LENGTH_LONG).show();
}
else
{
//checking if the user has an internet connection
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo info = cm.getActiveNetworkInfo();
if (info != null) {
if (!info.isConnected()) {
Toast.makeText(getApplicationContext(), "No Internet connection!", Toast.LENGTH_SHORT).show();
}
// execute async task
else
//new DownloadFile().execute(url);
newTask.execute(url);
}
else {
Toast.makeText(getApplicationContext(), "No Internet connection!", Toast.LENGTH_SHORT).show();
}
}
}});
}
//show progress dialog
#Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case progress_bar:
progressDialog = new ProgressDialog(this);
progressDialog.setMessage("Downloading… Please wait.");
progressDialog.setIndeterminate(false);
progressDialog.setMax(100);
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressDialog.setCancelable(false);
progressDialog.setButton(DialogInterface.BUTTON_NEGATIVE, "Cancel", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
dismissDialog(progress_bar);
newTask.cancel(true);
}
});
progressDialog.show();
return progressDialog;
default:
return null;
}
}
//backgroound downloading
class DownloadFile extends AsyncTask<String, String, String> {
#Override
protected void onPreExecute() {
super.onPreExecute();
showDialog(progress_bar);
}
#Override
protected String doInBackground(String... args) {
while (url != null) {
int count;
try {
URL url = new URL(args[0]);
URLConnection conection = url.openConnection();
conection.connect();
// getting file length
int fileLength = conection.getContentLength();
InputStream is = new BufferedInputStream(url.openStream(), 8192);
OutputStream os = new FileOutputStream(Environment.getExternalStorageDirectory().getPath() + "/_nvk_gram.zip");
byte data[] = new byte[1024];
long total = 0;
while ((count = is.read(data)) != -1) {
total += count;
publishProgress(""+(int)((total*100)/fileLength));
// writing data to file
os.write(data, 0, count);
}
// flush output
os.flush();
os.close();
is.close();
} catch (Exception e) {
Log.e("Error: ", e.getMessage());
}
//Unzip the downloaded zip file
{
String destinationDirectory = Environment.getExternalStorageDirectory().getPath() + "/my_Folder/db/my_file/";
int BUFFER = 2048;
List<String> zipFiles = new ArrayList<String>();
File sourceZipFile = new File(Environment.getExternalStorageDirectory().getPath() + "/_nvk_gram.zip");
File unzipDestinationDirectory = new File(destinationDirectory);
unzipDestinationDirectory.mkdir();
ZipFile zipFile = null;
// Open Zip file for reading
try {
zipFile = new ZipFile(sourceZipFile, ZipFile.OPEN_READ);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
// Create an enumeration of the entries in the zip file
Enumeration<? extends ZipEntry> zipFileEntries = zipFile.entries();
// Process each entry
while (zipFileEntries.hasMoreElements()) {
// grab a zip file entry
ZipEntry entry = (ZipEntry) zipFileEntries.nextElement();
String currentEntry = entry.getName();
File destFile = new File(unzipDestinationDirectory, currentEntry);
//destFile = new File(unzipDestinationDirectory, destFile.getName());
if (currentEntry.endsWith(".zip")) {
zipFiles.add(destFile.getAbsolutePath());
}
// grab file's parent directory structure
File destinationParent = destFile.getParentFile();
// create the parent directory structure if needed
destinationParent.mkdirs();
try {
// extract file if not a directory
if (!entry.isDirectory()) {
BufferedInputStream is =
new BufferedInputStream(zipFile.getInputStream(entry));
int currentByte;
// establish buffer for writing file
byte data[] = new byte[BUFFER];
// write the current file to disk
FileOutputStream fos = new FileOutputStream(destFile);
BufferedOutputStream dest =
new BufferedOutputStream(fos, BUFFER);
// read and write until last byte is encountered
while ((currentByte = is.read(data, 0, BUFFER)) != -1) {
dest.write(data, 0, currentByte);
}
dest.flush();
dest.close();
is.close();
}
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
try {
zipFile.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
for (Iterator<String> iter = zipFiles.iterator(); iter.hasNext();) {
String zipName = (String)iter.next();
doUnzip(
zipName,
destinationDirectory +
File.separatorChar +
zipName.substring(0,zipName.lastIndexOf(".zip"))
);
if(isCancelled())return (null);
}
}
}
File fav_ifo = new File(Environment.getExternalStorageDirectory()+"/my_Folder/db/my_file/my_file.nvk");
if(fav_ifo.exists())
{
try {
AssetManager am = getAssets();
String fileName = "my_file.ifo";
File destinationFile = new File(Environment.getExternalStorageDirectory()+"/my_Folder/db/my_file/" + fileName);
InputStream in = am.open("my_file.ifo");
FileOutputStream f = new FileOutputStream(destinationFile);
byte[] buffer = new byte[1024];
int len1 = 0;
while ((len1 = in.read(buffer)) > 0) {
f.write(buffer, 0, len1);
}
f.close();
} catch (Exception e) {
Log.d("CopyFileFromAssetsToSD", e.getMessage());
}
}
else
{
}
//Delete the downloaded zip
File folder = Environment.getExternalStorageDirectory();
String fileName = folder.getPath() + "/_nvk_gram.zip";
File myFile = new File(fileName);
if(myFile.exists())
myFile.delete();
return null;
}
private void doUnzip(String zipName, String string) {
// TODO Auto-generated method stub
}
//updating progress bar
protected void onProgressUpdate(String... progress) {
//progress percentage
progressDialog.setProgress(Integer.parseInt(progress[0]));
}
#Override
protected void onPostExecute(String file_url) {
dismissDialog(progress_bar);
//toast to notify user of download completion
Toast.makeText(getApplicationContext(), "Database successfully downloaded.", Toast.LENGTH_LONG).show();
Intent mainIntent = new Intent(Download_gram.this, my_Main_class.class);
Download_gram.this.startActivity(mainIntent);
}
}
}

see you should keep track of your DownloadFile(aSyncTask) class object.
Create a new variable in your
public class Download_gram extends Activity {
// File url to download
private static String url = "http://www.abc.123.zip";
private static DownloadFile newTask; // ADDED BY ME
// ... ...
you should save the object reference when you call
new DownloadFile().execute("Url String"); //you must be doing this
//instead you should do
newTask = new DownloadFile();
newTask.execute("Url String"); // YOUR OBJECT IS IN newTask
...
// keep track of this newTask variable
// when ever you want to cancel just call
newTask.cancel(true); // ADDED BY ME
dialog.dismiss();//In fact, I want to apply the code to stop both Progress Dialog and AsynTask here.
after setting newTask to cancel, you should check timely in doInBackground that is you task is canceled ? if yes then exit doInBackground
// YOU CAN USE THIS IN WHILE LOOP OF doInBakcground
if(isCancelled())return (null);
//This will exit doInBackground function and hence cancel task.
// you can perform other operations too in this "if" statement as per your need.
for reference of these functions
http://developer.android.com/reference/android/os/AsyncTask.html#cancel(boolean)
##################### New Version ################.
you haven't checked is the task is canceled or not. you have to check everywhere downloading is taking place in asynctask if iscancelled is true return (null); to halt asynctask and stop downloading.
you should replace following code:
while ((count = is.read(data)) != -1) { // inside doInBackground
total += count;
publishProgress(""+(int)((total*100)/fileLength));
// writing data to file
os.write(data, 0, count);
if(isCancelled())return (null); // ADDED BY ME
}
above added line is must this will check if task is canceled this doInBackground function should be over.

You should to
yourAsyncTask.cancel(true);
and, inside your class DownloadFile, you should to check for isCanceled() and do a return if true.

You can do it in this way,
progressDialog.setOnCancelListener(new DialogInterface.OnCancelListener(){
public void onCancel(DialogInterface dialog) {
yourAysncTask.cancel(true);
}
});