I'm with a little problem that is driving me crazy. I'm using a AsyncTask in a retained Fragment to update a progressDialog in my activity. I'm using callbacks to send the progress from my fragment.
The problem is: When I rotate my screen it simply stops do update the progressDialog in the recreated activity. It seems like onProgressUpdate stops to being called in the rotated activity.
the relevant part of the code is shown below:
Worker Fragment
public class WorkerFragment extends Fragment {
Context mContext;
...
public static interface TaskCallbacks {
void onPreExecute();
void onProgressUpdate(int... progress);
void onPostExecute();
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
mCallbacks = (TaskCallbacks) activity;
}
@Override
public void onDetach() {
super.onDetach();
mCallbacks = null;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Retain this fragment across configuration changes.
setRetainInstance(true);
}
//inner class
class DownloadFileFromURL extends AsyncTask<String, Int, Void> {
@Override
public void onPreExecute() {
if (mCallbacks != null) {
mCallbacks.onPreExecute();
}
@Override
public String doInBackground(String... f_url) {
... //some verifications of files
if(!localFile.exists()){
//http connection, check, buffer, inputstream, etc...
publishProgress((int)((bytesDownloaded*100)/remoteFileSize));
...
}
}
@Override
protected void onProgressUpdate(int... percent) {
if (mCallbacks != null) {
mCallbacks.onProgressUpdate(percent);
}
}
...
}
}
and the Activity
public class Updater extends Activity implements WorkerFragment.TaskCallbacks {
private WorkerFragment myWorker;
private ProgressDialog pDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_updater);
pDialog=null;
showDialog(1);
FragmentManager fm = getFragmentManager();
myWorker = (WorkerFragment) fm.findFragmentByTag("task");
if(myWorker == null)
{
myWorker = new WorkerFragment();
fm.beginTransaction().add(myWorker, "task").commit();
}
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case 1:
pDialog = new ProgressDialog(this);
pDialog.setMessage("Baixando arquivos de mídia");
pDialog.setIndeterminate(false);
pDialog.setMax(100);
pDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
pDialog.setCancelable(false);
pDialog.show();
dialogType=progress_bar_type;
return pDialog;
}
}
@Override
public void onProgressUpdate(int... progress) {
//setting progress percentage
if(pDialog!=null)
{
pDialog.setProgress(progress[0]);
}
}
@Override
public void onPostExecute(){
if(pDialog!=null)
{
dismissDialog(1);
...
}
}
