Android : How to add elements to listView from listener in another fragment

I would like to add elements to the listView in one fragment when the button in another fragment is pushed. I tried to figure it out by myself, but I couldn't find any solution.

These are my trials:

Code:

HistoryFragment.java - fragment in which I want a list view to be displayed

import java.util.ArrayList;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;

public class HistoryFragment extends Fragment {
    ListView listView;
    HistoryAdapter adapter;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View history = inflater.inflate(R.layout.fragment_history, container, false);
        ArrayList<ToSave> arrayOfData = new ArrayList<ToSave>();
        adapter = new HistoryAdapter(getActivity().getBaseContext(), arrayOfData);
        listView = (ListView) history.findViewById (R.id.listView1);
        listView.setAdapter(adapter);
        //ToSave toSave = new ToSave();
        //adapter.add(toSave);
        return history;

    }
}

HistoryAdapter.java - my listView adapter

import java.util.ArrayList;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

public class HistoryAdapter extends ArrayAdapter<ToSave>{

    public HistoryAdapter(Context context, ArrayList<ToSave> records) {
        super(context, R.layout.history_item, records);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ToSave record = getItem(position);
        if (convertView == null) {
              convertView = LayoutInflater.from(getContext()).inflate(R.layout.history_item, parent, false);
        }
        TextView tvDate = (TextView) convertView.findViewById(R.id.textViewDate);
        TextView tvStats = (TextView) convertView.findViewById(R.id.textViewStats);
        // Populate the data into the template view using the data object
        tvDate.setText(Integer.valueOf(record.numberDrinks).toString());
        tvStats.setText(Integer.valueOf(record.numberDrinks).toString());
        // Return the completed view to render on screen
        return convertView;

    }
}

Interface which I created in the fragment from which I want to controll the list view:

OnFinishedParty mCallback;

    public interface OnFinishedParty {
        public void onFinishedParty();
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);

        try {

            mCallback = (OnFinishedParty) activity;

        }
        catch (ClassCastException e) {
            throw new ClassCastException(activity.toString() + " must implement OnFinishedParty");
        }
    }

Button listener in this Fragment

Button button5 = (Button) started.findViewById(R.id.button5);
        button5.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                mCallback.onFinishedParty();
            }
        });

in MainActivity:

public void onFinishedParty() {
        ///What to put here??????
        ///Tried this but did not work:
        ToSave toSave = new ToSave();
        HistoryFragment.adapter.add(toSave);
        HistoryFragment.adapter.notifyDataSetChanged();
    }