After struggling with it for a day, this is what i found.
I am using ListFragment and Loaders with support library.
If I used same/standard Loaders code in a normal Activity it ListView
maintains its scroll position very precisely.
If I am using same/standar Loaders code in ListFragment then if I scroll
position is complete lost afte orientation change. And it ListView is
scrolled to top.
I also noticed that 'savedInstanceState' is coming as 'null' to for
'onCreate', 'onViewCreated' and 'onActivityCreated', even though I am
saving some state in 'onSaveInstanceState'.
Attached is the code for fragment.
I am just wondering...am I alone..:-/...?
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import android.database.Cursor;
import android.os.Bundle;
import android.provider.ContactsContract.Contacts;
import android.support.v4.app.ListFragment;
import android.support.v4.app.LoaderManager.LoaderCallbacks;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.util.Log;
import android.view.View;
public class MyFrag extends ListFragment implements LoaderCallbacks<Cursor> {
private static final String TAG = MyFrag.class.getSimpleName();
private MyAdapter myAdapter;
private int index = 0;
@Override
public void onActivityCreated(Bundle savedInstanceState) {
// TODO Auto-generated method stub
Log.d(TAG, "onActivityCreated savedInstanceState=" + savedInstanceState);
super.onActivityCreated(savedInstanceState);
myAdapter = new MyAdapter(getActivity(), null, true, getListView());
setListAdapter(myAdapter);
getLoaderManager().initLoader(0, null, this);
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
Log.d(TAG, "onViewCreated savedInstanceState=" + savedInstanceState);
// TODO Auto-generated method stub
super.onViewCreated(view, savedInstanceState);
}
@Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
Log.d(TAG, "onCreate savedInstanceState=" + savedInstanceState);
super.onCreate(savedInstanceState);
}
@Override
public void onSaveInstanceState(Bundle outState) {
outState.putInt("lv_index", index);
super.onSaveInstanceState(outState);
}
@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
// TODO Auto-generated method stub
Log.d(TAG, "creating loader");
CursorLoader cl = new CursorLoader(getActivity(), Contacts.CONTENT_URI, new String[] {
Contacts._ID, Contacts.DISPLAY_NAME
}, null, null, null);
return cl;
}
@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor newCursor) {
// TODO Auto-generated method stub
myAdapter.swapCursor(newCursor);
}
@Override
public void onLoaderReset(Loader<Cursor> loader) {
// TODO Auto-generated method stub
myAdapter.swapCursor(null);
}
}
