按标题分组显示的ListView

最近项目中需要做一个按标题分组的ListView,要实现的效果如下图

标题是月份，在按月份的数据是改月份的账单数据。开始想的就是在列表的某个位置插入另一个布局，其他的地方和普通的ListView一样。并不知道该在那个位置插入这些标题。所以需要在数据上进行处理，另外需要知道每个item位置应该用什么类型的item view。

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具体实现如下：

1.先对数据进行处理：
需要处理的json数据格式如下图 ， billList数组是每个需要展示的账单item，month字段是一个组item标题。

根据数据和展示的需求，创建一个数据实体类，代码如下：

 public static class ContentBean {
        private String month; //存储每组数据的月份标题
        private List<BillListResponse.ContentBean.BillListBean> billList;//一组数据的list列表

ListView的适配器（关键）

public class AllRecordBillAdapter extends BaseAdapter{
    //需要展示的数据 ， 多组数据的集合
    List<BillListResponse.ContentBean> mRecordContentList;
    private Context mContext;
    private LayoutInflater mInflater;

    //类别的ITEM 月份
    private static final int TYPE_ITEM = 0;
    //具体账单内容
    private static final int CONTENT_ITEM = 1;

    public  AllRecordBillAdapter(Context  context  , List<BillListResponse.ContentBean> billRecordBeanList) {
          mRecordContentList = billRecordBeanList;
          mContext = context;
          mInflater = LayoutInflater.from(mContext);
    }

    @Override
    public int getCount() {
        //计算出所有的要展示的数据item的个数，包括每一个
        int count = 0;
        if (null != mRecordContentList) {
            //  所有分类中item的总个数
            for (BillListResponse.ContentBean contentBean : mRecordContentList) {
                count += (contentBean.getBillList().size()+1);
            }
        }
        return count;
    }

    @Override
    public Object getItem(int position) {
        // 异常情况处理
        if (null == mRecordContentList || position <  0 || position > getCount()) {
            return null;
        }
        //同一分类内，第一个元素的索引值
        int groupFirstIndex = 0;
        for (BillListResponse.ContentBean contentBean : mRecordContentList) {
            int size = contentBean.getBillList().size()+1;
            // 在当前分类中的索引值
            int categoryIndex = position - groupFirstIndex;
            // item在当前分类内
            if (categoryIndex < size) {
                if(categoryIndex == 0){
                    //首选项返回的是月份
                    return   contentBean.getMonth();
                }else{
                    //返回其他数据
                    return  contentBean.getBillList().get(categoryIndex-1);
                }
            }
            // 索引移动到当前分类结尾，即下一个分类第一个元素索引
            groupFirstIndex += size;
        }
        return null;
    }

    @Override
    public int getItemViewType(int position) {
        // 异常情况处理
        if (null == mRecordContentList || position <  0|| position > getCount()) {
            return TYPE_ITEM;
        }
        int groupFirstIndex = 0;
        for (BillListResponse.ContentBean contentBean : mRecordContentList){
            int size = contentBean.getBillList().size()+1;
            // 在当前分类中的索引值
            int categoryIndex = position - groupFirstIndex;
            //分组的标题
            if (categoryIndex == 0) {
                return TYPE_ITEM;
            }
            groupFirstIndex += size;
        }
        //内容项
        return CONTENT_ITEM;
    }

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

    @Override
    public int getViewTypeCount() {
        return 2;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        int itemViewType = getItemViewType(position);
        switch (itemViewType) {
            case TYPE_ITEM:
                if (null == convertView) {
                    convertView = mInflater.inflate(R.layout.bill_record_item_header, null);
                }
                TextView textView = (TextView) convertView.findViewById(R.id.bill_record_header);
                String  itemValue = (String) getItem(position);
                textView.setText(itemValue);
                break;

            case CONTENT_ITEM:
                RecordViewHolder viewHolder = null;
                if (null == convertView) {
                    convertView = mInflater.inflate(R.layout.bill_record_content_item, null);
                    viewHolder = new RecordViewHolder();
                    viewHolder.contentWeek = (TextView) convertView.findViewById(R.id.bill_record_week_info);
                    viewHolder.contentDay = (TextView) convertView.findViewById(R.id.bill_record_day_info);
                    viewHolder.contentAmount = (TextView) convertView.findViewById(R.id.bill_record_amount_info);
                    viewHolder.contentType = (TextView) convertView.findViewById(R.id.bill_record_type_info);
                    convertView.setTag(viewHolder);
                } else {
                    viewHolder = (RecordViewHolder) convertView.getTag();
                }
                // 绑定数据
                BillListResponse.ContentBean.BillListBean billListBean = (BillListResponse.ContentBean.BillListBean)getItem(position);

                String createTime = billListBean.getCreateTime();
                String date = createTime.substring(5, 10);
                String week = dayForWeek(createTime.substring(0,10));

                viewHolder.contentWeek.setText(week);
                viewHolder.contentType.setText(billListBean.getItemName());
                viewHolder.contentDay.setText(date);
                viewHolder.contentAmount.setText(billListBean.getPrice()+"");
                break;
        }
        return convertView;
    }


    @Override
    public boolean areAllItemsEnabled() {
        return false;
    }

    @Override
    public boolean isEnabled(int position) {
        return getItemViewType(position) != TYPE_ITEM;
    }


    class  RecordViewHolder {
        TextView contentWeek;
        TextView contentDay;
        TextView contentAmount;
        TextView contentType;
    }


    public static String dayForWeek(String pTime){
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        Calendar c = Calendar.getInstance();
        try {
            c.setTime(format.parse(pTime));
        } catch (ParseException e) {
            e.printStackTrace();
        }
        int dayForWeek = 0;
        if(c.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY){
            dayForWeek = 7;
        }else{
            dayForWeek = c.get(Calendar.DAY_OF_WEEK) - 1;
        }
        if(dayForWeek == 1) {
            return "周一";
        }else if(dayForWeek == 2){
            return "周二";
        }else if(dayForWeek == 3){
            return "周三";
        }else if(dayForWeek == 4){
            return "周四";
        } else if(dayForWeek == 5){
            return "周五";
        }else if(dayForWeek == 6){
            return "周六";
        }else if(dayForWeek == 7){
            return "周日";
        }
        return null;
    }