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    <p>Ok, I believe I've solved this.</p> <p>In my Activity class I have a variable (boolean) <code>failed</code>. Also, I have a private <code>Downloader</code> class within the activity which extends <code>ASyncTask</code>. This way, the <code>Downloader</code> class has access to the <code>failed</code> boolean. When the Activity launches, it starts the <code>Downloader</code> task and a progress dialog pops up. When the task finishes, it closes the dialog and then goes on processing the downloaded content.</p> <p>However, when the user cancels the progress dialog, <code>failed</code> is set to true, and the user is sent back to the previous activity by a call to <code>finished</code>. In the meantime, <code>Downloader</code> is still busy downloading. Because the results are now unneccessary, we want it to stop using resources asap. In order to accomplish this, I have broken up the <code>doInBackground</code> method in as much steps as possible. After each step I check if <code>failed</code> is still <code>false</code>, when it is set to <code>true</code>, it simply doesn't go to the next step. See it in action below. Furthemore, the <code>BufferedReader reader</code> is public, and in the <code>onCancelled</code> method I execute <code>reader.close()</code>. This will throw all sorts of exceptions, but these are properly caught. </p> <pre><code> public void DoInBackground(.........) { try { URL url = new URL(uri); URLConnection conn = url.openConnection(); if (!failed) { isr = new InputStreamReader(conn.getInputStream()); if (!failed) { reader = new BufferedReader(isr); publishProgress(1); if (!failed) { TagNode node = cleaner.clean(reader); publishProgress(2); return node; } } } } catch (Exception e) { failed = true; Log.v("error",""+e); } } @Override protected void onCancelled() { failed = true; if (reader != null) try { reader.close(); } catch (IOException e) { failed = true; } if (isr != null) try { isr.close(); } catch (IOException e) { } } </code></pre> <p>I know that I could have broken up the downloading process in even tinier bits, but I am downloading very small files, so it's not that important.</p>
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