Question

When download file I show to user this dialog ,have cancel button

    protected Dialog onCreateDialog(int id) {
    switch (id) {
    case DIALOG_DOWNLOAD_PROGRESS:
        mProgressDialog = new ProgressDialog(this);
        mProgressDialog.setMessage("Downloading ..");
        mProgressDialog.setButton(DialogInterface.BUTTON_NEGATIVE,
                "Cancel", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.cancel();
                    }
                });
        mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        mProgressDialog.setCancelable(false);
        mProgressDialog.show();
        return mProgressDialog;
    default:
        return null;
    }
}

---

and my downloading code is :

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(sunDir.getPath()
                    + musicFileName);
            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;

    }

---

my problem is :

• when press cancel button on dialog file downloading don’t cancel
• I want to when user press cancel button if file downloaded complete
  or not delete file exactly

Answer 1

when press cancel button on dialog file downloading don’t cancel

you will need to use AsyncTask.cancel() for canceling AsyncTask on cancel button click as:

   public static boolean downloadstatus=true;
    mProgressDialog.setButton(DialogInterface.BUTTON_NEGATIVE,
                    "Cancel", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            your_AsyncTask.cancel(true);  //<<<<<
                             downloadstatus=false;
                            dialog.cancel();
                        }
                    });

I want to when user press cancel button if file downloaded complete or
not delete file exactly

you will need to check is AsyncTask running or canceled inside doInBackground to stop file downloading as :

    while ((count = input.read(data)) != -1) {
       if(!your_AsyncTask.isCancelled() &&  downloadstatus !=false){
        total += count;
        publishProgress("" + (int) ((total * 100) / lenghtOfFile));
        output.write(data, 0, count);
       }
      else{
             // free all resources here
            break;
        }
    }