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copied!<p>You are using 2 different instance of <code>DownloadFileAsync</code> in <code>startDownload()</code> and <code>CancelOnClickListener</code>. Try the following code:</p> <pre><code>public class ExampleActivity extends Activity { public static final int DIALOG_DOWNLOAD_PROGRESS = 0; private Button startBtn; private ProgressDialog mProgressDialog; DownloadFileAsync dfa = new DownloadFileAsync(); /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); startBtn = (Button)findViewById(R.id.startBtn); startBtn.setOnClickListener(new OnClickListener(){ public void onClick(View v) { startDownload(); } }); } private void startDownload() { String url = "http://farm1.static.flickr.com/114/298125983_0e4bf66782_b.jpg"; dfa.execute(url); } @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(true); mProgressDialog.setButton("Cancel", new CancelOnClickListener()); mProgressDialog.show(); return mProgressDialog; default: return null; } } private final class CancelOnClickListener implements DialogInterface.OnClickListener { public void onClick(DialogInterface dialog, int which) { ExampleActivity.this.finish(); dismissDialog(DIALOG_DOWNLOAD_PROGRESS); dfa.cancel(true); } } class DownloadFileAsync extends AsyncTask<String, String, String> { @Override protected void onPreExecute() { super.onPreExecute(); showDialog(DIALOG_DOWNLOAD_PROGRESS); } @Override 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("/sdcard/some_photo_from_gdansk_poland.jpg"); byte data[] = new byte[1024]; long total = 0; if(!isCancelled()){ while (!isCancelled() && (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); } } } </code></pre>

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