Android - Listview delete item and Refresh

Question

I am trying to implement ListView with Delete functionality to delete item from the listview. I am successful to delete but failed to refresh the listview after deletetion o

Answer 1

I'm guessing that using

getActivity().recreate();

instead of restarting the activity via a new Intent is better because using a new Intent will only stop the current activity and not destroy it.

Anyway, it works.

Answer 2

Call that Activity once again Using Intent

Answer 3

Try calling refreshDrawableState to tell the list to redraw.

Answer 4

I did something like this in my adapter:

((Activity)cxt).finish();
Intent intent = new Intent(cxt, YourActivity.class);
cxt.startActivity(intent);

This ends the activity and then starts the same one again.

Answer 5

I have the solution:

If you want to delete a row from a list view clicking on the DELETE button of each of that row do this. Here you have an example of a custom adapter class with a name and a delete button. Every time you press the button the row is deleted

public class UserCustomAdapter extends ArrayAdapter<User>{ 

Context context;
int layoutResourceId;
ArrayList<User> data = new ArrayList<User>();

public UserCustomAdapter(Context context, int layoutResourceId,ArrayList<User> data) {
    super(context, layoutResourceId, data);
    this.layoutResourceId = layoutResourceId;
    this.context = context;
    this.data = data;
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    View row = convertView;
    UserHolder holder = null;


    if (row == null) {
        LayoutInflater inflater = ((Activity) context).getLayoutInflater();
        row = inflater.inflate(layoutResourceId, parent, false);

        holder = new UserHolder();
        holder.textName = (TextView) row.findViewById(R.id.textView1);
        holder.btnDelete = (Button) row.findViewById(R.id.button2);
        row.setTag(holder);
    } else {
        holder = (UserHolder) row.getTag();

    }

    User user = data.get(position);


    holder.btnDelete.setTag(position);
    holder.textName.setText(user.getName());



    holder.btnDelete.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {

            String pos = v.getTag().toString();
            int _posicion = Integer.parseInt(pos);
            data.remove(_posicion);
            notifyDataSetChanged();

        }
    });

    return row;


}

static class UserHolder {
    TextView textName;
    Button btnDelete;
}
}

Answer 6

Does it remove it from your list adapter? If not that would be the reason the notifyDataSetChanged() won't do you much good.

Actually looking at your code again i can only find that you're removing it from your database and not the adapter itself.

edit (to answer comment): Well that's hard to do without your ListView_CustomAdapter class. The problem is, in this adapter there's a data set (the one you put in the constructor (listitemDisplay)) which needs to be updated as well. Only then the notifyDataSetChanged() will work.