How about something like this:
class MyActivity extends Activity {
Worker mWorker;
static class Worker extends AsyncTask<URL, Integer, Long> {
MyActivity mActivity;
Worker(MyActivity activity) {
mActivity = activity;
}
@Override
protected Long doInBackground(URL... urls) {
int count = urls.length;
long totalSize = 0;
for (int i = 0; i < count; i++) {
totalSize += Downloader.downloadFile(urls[i]);
publishProgress((int) ((i / (float) count) * 100));
}
return totalSize;
}
@Override
protected void onProgressUpdate(Integer... progress) {
if (mActivity != null) {
mActivity.setProgressPercent(progress[0]);
}
}
@Override
protected void onPostExecute(Long result) {
if (mActivity != null) {
mActivity.showDialog("Downloaded " + result + " bytes");
}
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mWorker = (Worker)getLastNonConfigurationInstance();
if (mWorker != null) {
mWorker.mActivity = this;
}
...
}
@Override
public Object onRetainNonConfigurationInstance() {
return mWorker;
}
@Override
protected void onDestroy() {
super.onDestroy();
if (mWorker != null) {
mWorker.mActivity = null;
}
}
void startWork() {
mWorker = new Worker(this);
mWorker.execute(...);
}
}