Develop Reference

Delete file if AsyncTask Fail

Currently
I am downloading a file from a URL, I'm doing this within AsyncTask inside a Adapter. The problem I have is that when I press back onBackPressed the download stops but the file remains in the folder FileOutputStream(Environment.getExternalStorageDirectory().toString()+"/file.mp4");
My Question
Is it possible to delete the file if AsyncTask does not complete?
I have tried to do file.delete(); in the catch of doinbackground but I get error file.delete(); is ignored
Here is a summary of my adapter----
When Item in holder is clicked I call AsyncTask:
holder.setItemClickListener(new ItemClickListener() {
if (pos == 1) {
if(manager.fetchVideoPath(pos)==null) {
DownloadFileFromURL p = new DownloadFileFromURL();
p.execute(pos + "", "https://www.dropbox.com/s/xnzw753f13k68z4/Piper%20First%20Look%20%282016%29%20-%20Pixar%20Animated%20Short%20HD.mp4?dl=1");
a = "one";
bars.set(pos,new ProgressModel(pos,1));
//This is what is causing the issue
RecyclerVideoAdapter.this.notifyItemChanged(pos);
}
My AsyncTask:
private class DownloadFileFromURL extends AsyncTask<String, String, String> {
#Override
protected void onPreExecute() {
super.onPreExecute();
((CircularProgressBar)vview.findViewById(R.id.circularProgressBar)).setProgress(1);
}
#Override
protected String doInBackground(String... f_url) {
int count;
String pathreference = f_url[0]+",";
positionnumber = Integer.parseInt(f_url[0]);
try {
URL url = new URL(f_url[1]);
URLConnection conection = url.openConnection();
conection.connect();
int lenghtOfFile = conection.getContentLength();
InputStream input = new BufferedInputStream(url.openStream(),
8192);
if (a.equals("one")) {
OutputStream output = new FileOutputStream(Environment
.getExternalStorageDirectory().toString()
+ "/file.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();
pathreference = pathreference+Environment.getExternalStorageDirectory().toString()+"/file.mp4";
output.close();
input.close();
}
} catch (Exception e) {
Log.e("Error: ", e.getMessage());
}
return pathreference;
}
protected void onProgressUpdate(String... progress) {
bars.get(positionnumber).setProgress_(Float.parseFloat(progress[0]));
((CircularProgressBar)vview.findViewById(R.id.circularProgressBar)).setProgress(bars.get(positionnumber).getProgress_());
}
#Override
protected void onPostExecute(String file_url) {
String []split = file_url.split(",");
int index1 = Integer.parseInt(split[0]);
videoHolderClass.set(index1,new VideoHolderClass(index1,imgres[0]));
bars.get(index1).setProgress_(0);
manager.insertVideoPath(index1+"",split[1]);
RecyclerVideoAdapter.this.notifyItemChanged(index1);
}
}

Building on the answer on this post, try to put the logic of deleting the file inside isCancelled() like this:
if (isCancelled() && file.exists())
file.delete();
else
{
// do your work here
}
Then you can call p.cancel(true) inside onBackPressed

Ekito Simple KML read source

I have one KML at this link:
http://myurl.com/mykml.kml
I want to get the com.ekito.simpleKML.model KML object from it.
I'm trying with this:
String url = "http://myurl.com/mykml.kml";
Serializer kmlSerializer = new Serializer();
Kml kml = kmlSerializer.read(url);
But the kml object is still null.
This is the link to the Ekito Simple KML library: https://github.com/Ekito/Simple-KML

I see the Ekito he can not read a file on the internet. Test this example!
private ProgressDialog progressBar;
public static final int KML_PROGRESS = 0;
public String fileURL ="http://myurl.com/mykml.kml";
// set in OnClick Button
new DownloadKML().execute(fileURL);
#Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case KML_PROGRESS:
progressBar = new ProgressDialog(this);
progressBar.setMessage("Downloading file…");
progressBar.setIndeterminate(false);
progressBar.setMax(100);
progressBar.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressBar.setCancelable(true);
progressBar.show();
return progressBar;
default:
return null;
}
}
class DownloadKML extends AsyncTask<String, String, String> {
#Override
protected void onPreExecute() {
super.onPreExecute();
showDialog(KML_PROGRESS);
}
#Override
protected String doInBackground(String... url) {
int count;
try {
URL url = new URL( url[0] );
URLConnection connect = url.openConnection();
connect.connect();
int progressOfFile = connect.getContentLength();
InputStream input = new BufferedInputStream(url.openStream());
OutputStream output = new FileOutputStream("/sdcard/KML_Samples.kml");
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
publishProgress(""+(int)((total*100)/progressOfFile) );
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
} catch (Exception e) {}
return null;
}
protected void onProgressUpdate(String... progress) {
progressBar.setProgress(Integer.parseInt(progress[0]));
}
#Override
protected void onPostExecute(String unused) {
dismissDialog(DIALOG_DOWNLOAD_PROGRESS);
String pathKML = Environment.getExternalStorageDirectory().toString() + "/KML_Samples.kml";
// load
Serializer kmlSerializer = new Serializer();
Kml kml = kmlSerializer.read(url);
}
}

how to download file in android download service

i have this url http://translate.google.com/translate_tts?ie=UTF-8&q=hi&tl=en&total=1&idx=0&textlen=2
when i place it to pc and android browser it makes me force to download
how can i make it download in my android application without browser.
i tried to make to download using this tutorial how can i download audio file from server by url
.but it did not work.
anyone please help
Thank you Kristijana Draca think it is working but where it save in emulator here is my code public class Main extends Activity {
EditText inputtext;
Button listen;
Button shareButton;
TextView tv;
ProgressBar proBar;
//ProgressDialog progress;
MediaPlayer player;
public Boolean isPlaying=true;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
downloadContent();
}
private void downloadContent() {
DownloadFile downloadFile = new DownloadFile();
downloadFile.execute("http://translate.google.com/translate_a/t?client=t&source=baf&sl=ar&tl=en&hl=en&q=%D9%85%D8%B1%D8%AD%D8%A8%D8%A7&sc=1 ");
}
// usually, subclasses of AsyncTask are declared inside the activity class.
// that way, you can easily modify the UI thread from here
class DownloadFile extends AsyncTask<String, Integer, String> {
#Override
protected String doInBackground(String... sUrl) {
try {
URL url = new URL(sUrl[0]);
URLConnection connection = url.openConnection();
connection.connect();
int fileLength = connection.getContentLength();
InputStream input = new BufferedInputStream(
connection.getInputStream());
// Create db
OutputStream output = new FileOutputStream(
Environment.getDataDirectory() + "/data/"
+ "com.jony.com" + "/file.mp3");
byte data[] = new byte[1024];
long total = 0;
int count;
while ((count = input.read(data)) != -1) {
total += count;
// publishing the progress....
publishProgress((int) (total * 100 / fileLength));
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
} catch (Exception e) {
}
return null;
}
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected void onProgressUpdate(Integer... progress) {
super.onProgressUpdate(progress);
Toast.makeText(getApplicationContext(), "download complete", 1000).show();
}
#Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
Toast.makeText(getApplicationContext(), "download complete", 1000).show();
}
}
});

You can download any file using AsyncTask.
downloadContent();
private void downloadContent() {
DownloadFile downloadFile = new DownloadFile();
downloadFile.execute("http://somehost.com/file.mp3");
}
// usually, subclasses of AsyncTask are declared inside the activity class.
// that way, you can easily modify the UI thread from here
private class DownloadFile extends AsyncTask<String, Integer, String> {
#Override
protected String doInBackground(String... sUrl) {
try {
URL url = new URL(sUrl[0]);
URLConnection connection = url.openConnection();
connection.connect();
int fileLength = connection.getContentLength();
InputStream input = new BufferedInputStream(
connection.getInputStream());
// Create db
OutputStream output = new FileOutputStream(
Environment.getDataDirectory() + "/data/"
+ PACKAGE_NAME + "/file.mp3");
byte data[] = new byte[1024];
long total = 0;
int count;
while ((count = input.read(data)) != -1) {
total += count;
// publishing the progress....
publishProgress((int) (total * 100 / fileLength));
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
} catch (Exception e) {
}
return null;
}
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected void onProgressUpdate(Integer... progress) {
super.onProgressUpdate(progress);
}
#Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
}
}

android 2.1 AsyncTask file download not working for multiple thread work fine when call single instance

i am using android 2.1 ,api level 7 and try to implement asynchronous file download from LAN server
for this i am trying to implement AsyncTask .When i am trying to call a single thread it works find but when call multiple its just stop both the thread
/* AsyncTask class*/
class DownloadFileAsync 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]);
Log.i("count","in");
URLConnection conexion = url.openConnection();
Log.i("count","in1");
conexion.connect();
Log.i("count","in2");
File root = android.os.Environment.getExternalStorageDirectory();
Log.i("count","in3");
int lenghtOfFile = conexion.getContentLength();
Log.i("count","in4");
BufferedInputStream input = new BufferedInputStream(url.openStream());
Log.i("count","in5");
OutputStream output = new FileOutputStream(root.getAbsolutePath() + "/video" +aurl[1] +".mp4");
byte data[] = new byte[1024];
long total = 0;
Log.i("count","in6");
while ((count = input.read(data)) != -1) {
//Log.i("count","in7");
total += count;
Log.i("count",aurl[1]);
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.i("progress",progress[0]);
}
#Override
protected void onPostExecute(String unused) {
Log.i("process","end");
}
}
/*main method call*/
private void startDownload() {
Log.v("count","out");
String url = lanurl+"titanic/video"+1+"_en.m4v";
new DownloadFileAsync().execute(url,"1");
url = lanurl+"titanic/video"+2+"_en.m4v";
new DownloadFileAsync().execute(url,"2");
}
output :
download both file in sd card
but no file downloading properly

I didn't understand the complete Question. But seems like your problem is with AsyncTask.
Single Object created for an AsyncTask can be used only once. If you want to use it again, you need to create an another object for the same AsyncTask.

Download in android large files

When I try this code, it starts download but then stuck with alert "force close"
what should I do? Use some kind of background thread?
try {
long startTime = System.currentTimeMillis();
URL u = new URL("http://file.podfm.ru/3/33/332/3322/mp3/24785.mp3");
HttpURLConnection c = (HttpURLConnection) u.openConnection();
c.setRequestMethod("GET");
c.setDoOutput(true);
c.connect();
FileOutputStream f = new FileOutputStream(new File("/sdcard/","logo.mp3"));
InputStream in = c.getInputStream();
byte[] buffer = new byte[1024];
int len1 = 0;
while ( (len1 = in.read(buffer)) != -1 ) {
f.write(buffer,0, len1);
}
f.close();
Log.d("ImageManager", "download ready in" +
((System.currentTimeMillis() - startTime) / 1000) + " sec");
}
catch (IOException e)
{
Log.d("ImageManager", "Error" +
((System.currentTimeMillis()) / 1000) + e + " sec");
}

I was dealing with similar problem last week and ended up using AsyncTask with progress bar displayed since it could take some time for the file to be downloaded. One way of doing it is to have below class nested in your Activity and just call it where you need to simply like this:
new DownloadManager().execute("here be URL", "here be filename");
Or if the class is not located within an activity and calling from an activity..
new DownloadManager(this).execute("URL", "filename");
This passes the activity so we have access to method getSystemService();
Here is the actual code doing all the dirty work. You will probably have to modify it for your needs.
private class DownloadManager extends AsyncTask<String, Integer, Drawable>
{
private Drawable d;
private HttpURLConnection conn;
private InputStream stream; //to read
private ByteArrayOutputStream out; //to write
private Context mCtx;
private double fileSize;
private double downloaded; // number of bytes downloaded
private int status = DOWNLOADING; //status of current process
private ProgressDialog progressDialog;
private static final int MAX_BUFFER_SIZE = 1024; //1kb
private static final int DOWNLOADING = 0;
private static final int COMPLETE = 1;
public DownloadManager(Context ctx)
{
d = null;
conn = null;
fileSize = 0;
downloaded = 0;
status = DOWNLOADING;
mCtx = ctx;
}
public boolean isOnline()
{
try
{
ConnectivityManager cm = (ConnectivityManager)mCtx.getSystemService(Context.CONNECTIVITY_SERVICE);
return cm.getActiveNetworkInfo().isConnectedOrConnecting();
}
catch (Exception e)
{
return false;
}
}
#Override
protected Drawable doInBackground(String... url)
{
try
{
String filename = url[1];
if (isOnline())
{
conn = (HttpURLConnection) new URL(url[0]).openConnection();
fileSize = conn.getContentLength();
out = new ByteArrayOutputStream((int)fileSize);
conn.connect();
stream = conn.getInputStream();
// loop with step
while (status == DOWNLOADING)
{
byte buffer[];
if (fileSize - downloaded > MAX_BUFFER_SIZE)
{
buffer = new byte[MAX_BUFFER_SIZE];
}
else
{
buffer = new byte[(int) (fileSize - downloaded)];
}
int read = stream.read(buffer);
if (read == -1)
{
publishProgress(100);
break;
}
// writing to buffer
out.write(buffer, 0, read);
downloaded += read;
// update progress bar
publishProgress((int) ((downloaded / fileSize) * 100));
} // end of while
if (status == DOWNLOADING)
{
status = COMPLETE;
}
try
{
FileOutputStream fos = new FileOutputStream(filename);
fos.write(out.toByteArray());
fos.close();
}
catch ( IOException e )
{
e.printStackTrace();
return null;
}
d = Drawable.createFromStream((InputStream) new ByteArrayInputStream(out.toByteArray()), "filename");
return d;
} // end of if isOnline
else
{
return null;
}
}
catch (Exception e)
{
e.printStackTrace();
return null;
}// end of catch
} // end of class DownloadManager()
#Override
protected void onProgressUpdate(Integer... changed)
{
progressDialog.setProgress(changed[0]);
}
#Override
protected void onPreExecute()
{
progressDialog = new ProgressDialog(/*ShowContent.this*/); // your activity
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressDialog.setMessage("Downloading ...");
progressDialog.setCancelable(false);
progressDialog.show();
}
#Override
protected void onPostExecute(Drawable result)
{
progressDialog.dismiss();
// do something
}
}

You should try using an AsyncTask. You are getting the force quit dialog because you are trying to do too much work on the UI thread and Android judges that your application has become unresponsive.
The answers to this question have some good links.
Something like the following would be a good start:
private class DownloadLargeFileTask extends AsyncTask<Void, Void, Void> {
private final ProgressDialog dialog;
public DownloadLargeFileTask(ProgressDialog dialog) {
this.dialog = dialog;
}
protected void onPreExecute() {
dialog.show();
}
protected void doInBackground(Void... unused) {
downloadLargeFile();
}
protected void onPostExecute(Void unused) {
dialog.dismiss();
}
}
and then execute the task with:
ProgressDialog dialog = new ProgressDialog(this);
dialog.setMessage("Loading. Please Wait...");
new DownloadLargeFileTask(dialog).execute();