[Android] Standard Adapter specification writing

public class TaskAdapter extends BaseAdapter {

    private Context mContext;
    private ArrayList<TaskModel> taskModelList = new ArrayList<>();


    public TaskAdapter(Context mContext, ArrayList<TaskModel> taskModelList) {
        this.mContext = mContext;
        this.taskModelList = taskModelList;
    }

    public class Holder {
        private ImageView img;
        private TextView title;
        private TextView intent;
        private TextView kind;
        private TextView location;

        private TextView name;
        private TextView money;
        private TextView num;


    }


    @Override
public int getCount() {    

        if (null == taskModelList) {
            return 0;
        } else {
            return taskModelList.size();
        }

    }

    @Override
public Object getItem(int position) {
        return position;
}        

    @Override
public long getItemId(int position) {
        return position;
}        

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

            holder = new Holder();
            convertView = LayoutInflater.from(mContext).inflate(R.layout.item_4_list_view_task, null);
            holder.img = (ImageView) convertView.findViewById(R.id.img_4_task_list);
            holder.name = (TextView) convertView.findViewById(R.id.tv_4_task_list_name);
            holder.title = (TextView) convertView.findViewById(R.id.tv_4_task_list_title);
            holder.intent = (TextView) convertView.findViewById(R.id.tv_4_task_list_intent);
            holder.kind = (TextView) convertView.findViewById(R.id.tv_4_task_list_kind);
            holder.location = (TextView) convertView.findViewById(R.id.tv_4_task_list_location);
            holder.money = (TextView) convertView.findViewById(R.id.tv_4_task_list_money);
            holder.num = (TextView) convertView.findViewById(R.id.tv_4_task_list_num);
            convertView.setTag(holder);
        } else {
            holder = (Holder) convertView.getTag();
        }

        final TaskModel info = taskModelList.get(position);

//        ImgCacheUtil.getInstance().setImage(holder.img, info.getTaskImgURL().toString());
        holder.name.setText(info.getTaskName());
        holder.title.setText(info.getTaskTitle());
        holder.intent.setText(info.getTaskIntent());
        holder.kind.setText(info.getTaskKind());
        holder.location.setText(info.getTaskLocation());
        holder.money.setText(MoneyUtils.getFormatMoneyStr(info.getTaskMoney()));
        holder.num.setText(info.getTaskNum());

        return convertView;
    }


    public void setAdapterData(ArrayList<TaskModel> data) {
        taskModelList.addAll(data);
    }


}