An Android Fragment to display list of upcoming bills

UpComingBillsFragment

package com.valokafor.billduedateazure.Fragments;

import android.app.AlertDialog;
import android.app.Fragment;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;

import com.microsoft.windowsazure.mobileservices.ServiceFilterResponse;
import com.microsoft.windowsazure.mobileservices.TableQueryCallback;
import com.valokafor.billduedateazure.Adapters.UpcomingBillAdapter;
import com.valokafor.billduedateazure.AzureMobileService.BillDueDateService;
import com.valokafor.billduedateazure.BillDueDateApplication;
import com.valokafor.billduedateazure.Model.Bill;
import com.valokafor.billduedateazure.R;

import java.util.ArrayList;
import java.util.List;

/**

 */
public class UpcomingBillsFragment extends Fragment {

    private View mRootView;
    private final static  String TAG = UpcomingBillsFragment.class.getSimpleName();
    UpcomingBillAdapter mUpcomingBillAdapter;
    private ListView upComingBillListView;
    private List<Bill> listOfBills = new ArrayList<Bill>();


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        mRootView = inflater.inflate(R.layout.fragment_upcoming_bills, container, false);

        mUpcomingBillAdapter = new UpcomingBillAdapter(getActivity(), 0, listOfBills);

        upComingBillListView = (ListView) mRootView.findViewById(R.id.upcoming_bills_listview);
        upComingBillListView.setAdapter(mUpcomingBillAdapter);
        refreshUpComingBills();
        return mRootView;
    }

    private void refreshUpComingBills() {
        Log.i(TAG, "Calling get data");
        BillDueDateApplication myApp = (BillDueDateApplication) getActivity().getApplication();
        BillDueDateService mBillDueDateService = myApp.getBillDueDateService();

        mBillDueDateService.mBillTable
                .execute(new TableQueryCallback<Bill>() {
            @Override
            public void onCompleted(List<Bill> result, int count,
                                    Exception exception, ServiceFilterResponse response) {
                if (exception == null){
                   for (Bill bill : result){
                       long timeInLong = bill.getBillDueDate().getTime();
                       long currentTime = System.currentTimeMillis();
                       long diffTime = timeInLong - currentTime;
                       long diffDays = diffTime / (1000 * 60 * 60 * 24);
                       int daysdiff = (int) diffDays;
                       bill.setDaysBeforeDueDate(daysdiff);
                        mUpcomingBillAdapter.add(bill);
                    }

                } else {
                    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
                    builder.setMessage(exception.getMessage());
                    builder.setTitle("Error");
                    builder.create().show();
                }
            }
        });

    }
}