Update listview with custom adapter and database handler - database

Question

I can't update listview with custom adapter and database handler.
Items are updated in the database handler, but listview is updated only when I leave the fragment and come back. I would like to see changes just after adding new item.
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.shopping_list_fragment_layout, container, false);
super.onCreate(savedInstanceState);
//// adding an item to itemList
nameTxt = (EditText) view.findViewById(R.id.txtItem);
couponsAmount = 3;
dbHandler = new ShoppingListDatabaseHandler(getActivity());
itemListView = (ListView) view.findViewById(R.id.listViewShoppingItems);
final ShoppingListListAdapter itemAdapter = new ShoppingListListAdapter(getActivity(), ITEMS_DATA);
final ImageButton addBtn = (ImageButton) view.findViewById(R.id.btnAddItem);
addBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view){
ShoppingListItem item = new ShoppingListItem(dbHandler.getItemsCount(), String.valueOf(nameTxt.getText()), 3);
if (!itemExists(item)) {
dbHandler.createItem(item);
//getListView().invalidateViews();
itemAdapter.notifyDataSetChanged(); // TODO: is not updating
Toast.makeText(getActivity(), String.valueOf(nameTxt.getText()) + " has been added", Toast.LENGTH_SHORT).show();
nameTxt.setText("");
return;
}
Toast.makeText(getActivity(), String.valueOf(nameTxt.getText()) + " already exists", Toast.LENGTH_SHORT).show();
nameTxt.setText("");
}
});
if (dbHandler.getItemsCount() != 0){
ITEMS_DATA.addAll(dbHandler.getAllItems());
}
//itemListView.getListView().invalidateViews();
//itemAdapter.notifyDataSetChanged();
itemListView.setAdapter(itemAdapter);
return view;
}
and my adapter:
public class ShoppingListListAdapter extends BaseAdapter {
private Context context;
private final List<ShoppingListItem> Items; // = new ArrayList<ShoppingListItem>();
//Constructor to initialize values
public ShoppingListListAdapter(Context context, List<ShoppingListItem> Items) {
this.context = context;
this.Items = Items;
}
#Override
public int getCount() {
// Number of times getView method call depends upon
return Items.size();
}
#Override
public Object getItem(int position) {
return null;
}
#Override
public long getItemId(int position) {
return 0;
}
// Number of times getView method call depends upon
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View gridView;
if (convertView == null) {
gridView = new View(context);
gridView = inflater.inflate(R.layout.shopping_list_list_item, null);
ShoppingListItem currentItem = Items.get(position);
TextView itemNameTxt = (TextView) gridView.findViewById(R.id.itemName);
itemNameTxt.setText(currentItem.getName());
TextView couponsAmount = (TextView) gridView.findViewById(R.id.couponsAmount);
couponsAmount.setText("-" + currentItem.getCouponsAmount().toString());
}
else {
gridView = (View) convertView;
}
return gridView;
}
}
I tried:
- getListView().invalidateViews();
- adapter.notifyDataSetChanged();
But probably I do sth wrongly, because it is not helping me.
Can you look at my code?

Answer 1

You have added the item to your database, but not to the list used to create the adapter.
ITEM_DATA.add(item):
itemAdapter.notifyDataSetChanged();