Hey guys,
At the beginning of my application, I load a serialized dictionary in
a AsyncTask while the UI thread should print a progress bar showing
the loading progress.
At the execution, the dictionary is well loaded but, the progress bar
becomes full at the end of the AsyncTask, just before the
postExecute() function is executed (where the main UI is drawn). So
the user doesn't know about the loading progress since
the progress bar doesn't change before the end of the loading.
The code of my AsyncTask class:
private class LoadDictionaryTask extends AsyncTask<Void, Integer,
Void> implements Serializable{
@Override
protected void onPreExecute() {
bar =
(ProgressBar)findViewById(R.id.progressbar);
bar.setMax(12);
bar.setProgress(0);
}
@Override
protected Void doInBackground(Void... unused) {
Looper.prepare();
try{
ObjectInputStream ois = new
ObjectInputStream(getResources().openRawResource(R.raw.my_dico));
Family family;
for(int i=1; i<13; i++){
family = (Family) ois.readObject();
dictionary.put(family.familyName,
family);
publishProgress(i);
}
ois.close();
}
catch(Exception e){
Log.e("ERROR","error e : "+e);
}
return null;
}
@Override
protected void onProgressUpdate(Integer... progress) {
bar.setProgress(progress[0]);
}
@Override
protected void onPostExecute(Void unused) {
drawUI();
}
}
If anyone has an idea....
PS : I found this, explaining the same problem :
http://vkroz.wordpress.com/2010/02/25/programming-android-non-documented-problems-with-asynctask/
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