i'm using a custom ArrayAdapter to show my listView ,i click on item and navigate to detail activitivity , all it's working fine , but when i go back to my listView it's getting scrolling to top, i'm using the master detail flow generated by Android ( i just costumized the listView and detailView )
here is my costum arrayAdapter :
public class MyAdapter extends ArrayAdapter<DummyContent.DummyItem> {
private final Context context;
private final List<DummyContent.DummyItem> values;
public MyAdapter(Context context, List<DummyContent.DummyItem> values) {
super(context, R.layout.list_item , values);
this.context = context;
this.values = values;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View rowView = convertView;
if(rowView == null){
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
rowView = inflater.inflate(R.layout.list_item, parent, false);
TextView textViewTitre = (TextView) rowView.findViewById(R.id.titre);
TextView textViewSC = (TextView) rowView.findViewById(R.id.sc);
textViewTitre.setText(values.get(position).titre);
textViewSC.setText(values.get(position).sctitre);
}
return rowView;
}
public void refill(List<DummyContent.DummyItem> events) {
values.clear();
values.addAll(events);
notifyDataSetChanged();
}
and here is my ListFragment class :
public class EventListFragment extends ListFragment {
/**
* The serialization (saved instance state) Bundle key representing the
* activated item position. Only used on tablets.
*/
private static final String STATE_ACTIVATED_POSITION = "activated_position";
/**
* The fragment's current callback object, which is notified of list item
* clicks.
*/
private Callbacks mCallbacks = sDummyCallbacks;
/**
* The current activated item position. Only used on tablets.
*/
private int mActivatedPosition = ListView.INVALID_POSITION;
/**
* A callback interface that all activities containing this fragment must
* implement. This mechanism allows activities to be notified of item
* selections.
*/
public interface Callbacks {
/**
* Callback for when an item has been selected.
*/
public void onItemSelected(String id);
}
/**
* A dummy implementation of the {@link Callbacks} interface that does
* nothing. Used only when this fragment is not attached to an activity.
*/
private static Callbacks sDummyCallbacks = new Callbacks() {
@Override
public void onItemSelected(String id) {
}
};
/**
* Mandatory empty constructor for the fragment manager to instantiate the
* fragment (e.g. upon screen orientation changes).
*/
public EventListFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
MyAdapter adapter = new MyAdapter(getActivity(), DummyContent.ITEMS);
setListAdapter(adapter);
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
// Restore the previously serialized activated item position.
if (savedInstanceState != null
&& savedInstanceState.containsKey(STATE_ACTIVATED_POSITION)) {
setActivatedPosition(savedInstanceState
.getInt(STATE_ACTIVATED_POSITION));
}
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
// Activities containing this fragment must implement its callbacks.
if (!(activity instanceof Callbacks)) {
throw new IllegalStateException(
"Activity must implement fragment's callbacks.");
}
mCallbacks = (Callbacks) activity;
}
@Override
public void onDetach() {
super.onDetach();
// Reset the active callbacks interface to the dummy implementation.
mCallbacks = sDummyCallbacks;
}
@Override
public void onListItemClick(ListView listView, View view, int position,
long id) {
super.onListItemClick(listView, view, position, id);
// Notify the active callbacks interface (the activity, if the
// fragment is attached to one) that an item has been selected.
mCallbacks.onItemSelected(DummyContent.ITEMS.get(position).id);
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
if (mActivatedPosition != ListView.INVALID_POSITION) {
// Serialize and persist the activated item position.
outState.putInt(STATE_ACTIVATED_POSITION, mActivatedPosition);
}
}
/**
* Turns on activate-on-click mode. When this mode is on, list items will be
* given the 'activated' state when touched.
*/
public void setActivateOnItemClick(boolean activateOnItemClick) {
// When setting CHOICE_MODE_SINGLE, ListView will automatically
// give items the 'activated' state when touched.
getListView().setChoiceMode(
activateOnItemClick ? ListView.CHOICE_MODE_SINGLE
: ListView.CHOICE_MODE_NONE);
}
private void setActivatedPosition(int position) {
if (position == ListView.INVALID_POSITION) {
getListView().setItemChecked(mActivatedPosition, false);
} else {
getListView().setItemChecked(position, true);
}
mActivatedPosition = position;
}
and my MainActivity :
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
new LoadEvents().execute();
}
/**
* Callback method from {@link EventListFragment.Callbacks} indicating that
* the item with the given ID was selected.
*/
@Override
public void onItemSelected(String id) {
if (mTwoPane) {
// In two-pane mode, show the detail view in this activity by
// adding or replacing the detail fragment using a
// fragment transaction.
Bundle arguments = new Bundle();
arguments.putString(EventDetailFragment.ARG_ITEM_ID, id);
EventDetailFragment fragment = new EventDetailFragment();
fragment.setArguments(arguments);
getSupportFragmentManager().beginTransaction()
.replace(R.id.event_detail_container, fragment).commit();
} else {
// In single-pane mode, simply start the detail activity
// for the selected item ID.
Intent detailIntent = new Intent(this, EventDetailActivity.class);
detailIntent.putExtra(EventDetailFragment.ARG_ITEM_ID, id);
startActivity(detailIntent);
}
}
class LoadEvents extends AsyncTask<String, String, String> {
/**
* Aficher le sabiler avant l'opreration
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(EventListActivity.this);
pDialog.setMessage("Wait...");
pDialog.show();
}
/**
* recuperer la liste des events
* */
protected String doInBackground(String... args) {
// Creation des Parameteres
List<NameValuePair> params = new ArrayList<NameValuePair>();
// JSON string à partir du URL
JSONObject json = jParser.makeHttpRequest(
AgendaIConstantes.URL_EVENTS, "GET", params);
..... processing here
DummyContent.ITEMS.add(item);
DummyContent.ITEM_MAP.put(item.id, item);
}
} else {
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String file_url) {
// masquer le progress dialog
pDialog.dismiss();
setContentView(R.layout.activity_event_list);
if (findViewById(R.id.event_detail_container) != null) {
// The detail container view will be present only in the
// large-screen layouts (res/values-large and
// res/values-sw600dp). If this view is present, then the
// activity should be in two-pane mode.
mTwoPane = true;
// In two-pane mode, list items should be given the
// 'activated' state when touched.
((EventListFragment) getSupportFragmentManager()
.findFragmentById(R.id.event_list))
.setActivateOnItemClick(true);
}
}
}
