Custom Listview Adapter Android

ServiceAdapter

package com.okason.serviceinvoice.Adapters;

import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;

import com.okason.serviceinvoice.Activities.ServiceListActivity;
import com.okason.serviceinvoice.Comparer.ServiceComparer;
import com.okason.serviceinvoice.Data.DatabaseManager;
import com.okason.serviceinvoice.Model.ProfessionalService;
import com.okason.serviceinvoice.R;
import com.okason.serviceinvoice.Utilities.CurrencyFormatter;
import com.okason.serviceinvoice.Utilities.ServiceUtils;

import java.util.Collections;
import java.util.List;

/**
 * Created by Valentine on 2/5/2015.
 */
public class ServiceAdapter extends ArrayAdapter<ProfessionalService> {
    private List<ProfessionalService> mListOfServices;
    private int layoutResourceId;
    private Activity mActivity;

    //Current sort method
    private static ServiceUtils.SortMethod sSortMethod;


    //Database reference
    private DatabaseManager mDatabaseManager;

    /***
     * Constructor
     * @param activity = context
     */
    public ServiceAdapter(Activity activity, int resource, List<ProfessionalService> services) {
        super(activity, resource, services);
        this.mActivity = activity;
        this.layoutResourceId = resource;
        this.mListOfServices = services;

        //If there is no current sort method, use Name
        if (sSortMethod == null){
            sSortMethod = ServiceUtils.SortMethod.NAME;
        }

        mDatabaseManager = DatabaseManager.getInstance(mActivity);
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        View view = convertView;
        ServiceHolder holder = null;
        if (view == null){
            LayoutInflater inflater = (LayoutInflater) mActivity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = inflater.inflate(R.layout.list_row_service, null);

            holder = new ServiceHolder();
            holder.textName = (TextView) view.findViewById(R.id.tvServiceName);
            holder.textPrice = (TextView) view.findViewById(R.id.tvServicePrice);
            holder.textCategory = (TextView) view.findViewById(R.id.tvServiceCategory);
            holder.checkBoxAdd = (CheckBox) view.findViewById(R.id.checkboxAdd);
            holder.buttonDeleteService = (ImageButton) view.findViewById(R.id.buttonDeleteService);
            holder.buttonEditService = (ImageButton) view.findViewById(R.id.buttonEditService);
            view.setTag(holder);
        } else {
            holder = (ServiceHolder) view.getTag();
        }

        final ProfessionalService serviceItem = mListOfServices.get(position);
        holder.textName.setText(serviceItem.getName());
        holder.textPrice.setText(CurrencyFormatter.FormatCurrency(serviceItem.getPrice()));
        holder.textCategory.setText(serviceItem.getCategory());

        holder.buttonEditService.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
              Toast.makeText(mActivity, "Edit Button Clicked", Toast.LENGTH_SHORT).show();
            }
        });

        holder.buttonDeleteService.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                    if (mDatabaseManager.deleteServiceById(serviceItem.getId())){
                    mListOfServices.remove(position);
                    notifyDataSetChanged();
                } else {{
                    Toast.makeText(mActivity, "Unable to delete Delete",
                            Toast.LENGTH_SHORT).show();
                }}
            }
        });

        holder.checkBoxAdd.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if (mActivity instanceof ServiceListActivity){
                    ((ServiceListActivity)mActivity).onServiceSelected(serviceItem, isChecked);
                }
            }
        });

        return view;
    }

    //This adds a ServiceItem to the List property of this adapter
    public void add(ProfessionalService service){
        mListOfServices.add(service);
        notifyDataSetChanged();
    }



    public static class ServiceHolder{
        TextView textPrice;
        TextView textName;
        TextView textCategory;
        CheckBox checkBoxAdd;
        ImageButton buttonEditService;
        ImageButton buttonDeleteService;
    }
}