Android日期筛选

最近接到了一个新的需求：
通过一个日期选择器筛选出自己想要的特定日期
先上效果图：

实现思路及过程

我这里是用RecyclerView实现的这个效果，将RecycleView分为两部分，头部只显示月份，日期则放在了第二部分，通过点击动态修改总数据的itemState 状态实现其效果 最重要的：(通过切换上个月下个月因此状态的改变不能只改变当前数据，需要一个总数据容器记录所有数据，当点击状态发生变化，修改总数据中的当前选中的状态)
先来看我的实体类：

public class DateBean {
    //item类型
    public static int item_type_day = 1;//日期item
    public static int item_type_month = 2;//月份item
    int itemType = 1;//默认是日期item

    //item状态
    public static int ITEM_STATE_BEGIN_DATE = 1;//开始日期
    public static int ITEM_STATE_END_DATE = 2;//结束日期
    public static int ITEM_STATE_SELECTED = 3;//选中状态
    public static int ITEM_STATE_NORMAL = 4;//正常状态

    public int itemState = ITEM_STATE_NORMAL;

    Date date;//具体日期
    String day;//一个月的某天
    String monthStr;//YY-MM

    int position;
    int level;


    public int getItemState() {
        return itemState;
    }

    public void setItemState(int itemState) {
        this.itemState = itemState;
    }

    public int getItemType() {
        return itemType;
    }

    public void setItemType(int itemType) {
        this.itemType = itemType;
    }

    public String getMonthStr() {
        return monthStr;
    }

    public void setMonthStr(String monthStr) {
        this.monthStr = monthStr;
    }

    public static int getItem_type_month() {
        return item_type_month;
    }

    public static void setItem_type_month(int item_type_month) {
        DateBean.item_type_month = item_type_month;
    }

    public static int getItem_type_day() {
        return item_type_day;
    }

    public static void setItem_type_day(int item_type_day) {
        DateBean.item_type_day = item_type_day;
    }

    public String getDay() {
        return day;
    }

    public void setDay(String day) {
        this.day = day;
    }

    public Date getDate() {
        return date;
    }

    public void setDate(Date date) {
        this.date = date;
    }

    public int getPosition() {
        return position;
    }

    public void setPosition(int position) {
        this.position = position;
    }

    public int getLevel() {
        return level;
    }

    public void setLevel(int level) {
        this.level = level;
    }



    @Override
    public String toString() {
        return "DateBean{" +
                "itemType=" + itemType +
                ", itemState=" + itemState +
                ", date=" + date +
                ", day='" + day + '\'' +
                ", monthStr='" + monthStr + '\'' +
                '}';
    }
}

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详细的都有注释 这里就不再啰嗦了

Aadpter内的内容如下：

public class CalendarAdapter extends BaseAdapter<DateBean, RecyclerView.ViewHolder>{


    private OnDateSelect dateSelect;

    public CalendarAdapter(Context context){
        super(context);
    }

    @Override
    protected RecyclerView.ViewHolder onCreateChildViewHolder(ViewGroup parent, int viewType) {

        if (viewType==DateBean.item_type_month){
          return new MonthViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_month, parent, false));
        }else {
            return new DayViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_day, parent, false));
        }

    }

    @Override
    protected void onBindDataViewHolder(RecyclerView.ViewHolder holder, int position, DateBean dateBean) {
         if (holder instanceof MonthViewHolder){
             ((MonthViewHolder) holder).mTvMonth.setText(dateBean.monthStr);
         }else if(holder instanceof DayViewHolder){
             ((DayViewHolder) holder).mTvDay.setText(dateBean.getDay());


             if (dateBean.getItemState() == DateBean.ITEM_STATE_BEGIN_DATE || dateBean.getItemState() == DateBean.ITEM_STATE_END_DATE) {
                 //开始日期或结束日期
                 ((DayViewHolder) holder).mTvDay.setTextColor(Color.WHITE);

                 if(dateBean.getItemState() == DateBean.ITEM_STATE_BEGIN_DATE){
                     holder.itemView.setBackgroundResource(R.drawable.day_start);
                 }
                 if(dateBean.getItemState() == DateBean.ITEM_STATE_END_DATE){
                     holder.itemView.setBackgroundResource(R.drawable.day_end);
                 }

             } else if (dateBean.getItemState() == DateBean.ITEM_STATE_SELECTED) {
                 //选中状态
                 holder.itemView.setBackgroundColor(Color.parseColor("#40ffa500"));
                 ((DayViewHolder) holder).mTvDay.setTextColor(Color.WHITE);
             } else {
                 //正常状态
                 holder.itemView.setBackgroundColor(Color.WHITE);
                 ((DayViewHolder) holder).mTvDay.setTextColor(Color.BLACK);
             }

             holder.itemView.setOnClickListener(new View.OnClickListener() {
                 @Override
                 public void onClick(View view) {
                     if (dateSelect!=null){
                         dateSelect.onDateSelectStatusChanged(dateBean,position);
                     }
                 }
             });
         }
    }

    static class MonthViewHolder extends RecyclerView.ViewHolder {
        View view;
        TextView mTvMonth;


        public MonthViewHolder(@NonNull View itemView) {
            super(itemView);
            this.view = itemView;
            mTvMonth = itemView.findViewById(R.id.tv_month);

        }
    }

    static class DayViewHolder extends RecyclerView.ViewHolder {
        View view;
        TextView mTvDay;


        public DayViewHolder(@NonNull View itemView) {
            super(itemView);
            this.view = itemView;
            mTvDay = itemView.findViewById(R.id.tv_day);

        }
    }

    @Override
    public int getItemViewType(int position) {
        if (getMds().get(position).itemType==DateBean.item_type_month){
            return DateBean.item_type_month;
        }else {
            return DateBean.item_type_day;
        }
    }

    public interface OnDateSelect{
        void onDateSelectStatusChanged(DateBean dateBean,int position);
    }

    public void setOnDateSelect(OnDateSelect select){
        dateSelect = select;
    }
}

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Adapter里面主要是对每个状态下显示什么样的效果进行了效果展示，点击事件后的主要逻辑通过接口回调到了具体使用的Activity中去了。

最最主要的Activity的代码：

public class CalendarActivity extends AppCompatActivity {
    private RecyclerView mRecyclerView;
    private CalendarAdapter mCalendarAdapter;
    private LruCache<String, List<DateBean>> mDateBeanLruCache = new LruCache<>(3);

    private DateBean startDate,endDate;
    private TextView nextMonth;
    private TextView currentMonth;
    private ImageView imageView;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_calendar);
        initView();
    }

    private void initView() {
        mRecyclerView = findViewById(R.id.calendar_list);
        mCalendarAdapter = new CalendarAdapter(this);

        TextView previousMonth = findViewById(R.id.tvUp);
        nextMonth = findViewById(R.id.tvDown);
        currentMonth = findViewById(R.id.tvMonth);

        previousMonth.setOnClickListener(view -> {
            initData("2022-07");
        });

        nextMonth.setOnClickListener(view -> {
            initData("2022-09");
        });

        currentMonth.setOnClickListener(view -> {
            initData("2022-08");
        });

        GridLayoutManager gridLayoutManager = new GridLayoutManager(this, 7);
        gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
            @Override
            public int getSpanSize(int i) {
                if (DateBean.item_type_month == mCalendarAdapter.getMds().get(i).getItemType()) {
                    return 7;
                } else {
                    return 1;
                }
            }
        });
        mRecyclerView.setLayoutManager(gridLayoutManager);
        mRecyclerView.setAdapter(mCalendarAdapter);

        mCalendarAdapter.setOnDateSelect((dateBean, position) -> {
            if (dateBean.day.isEmpty()){
                return;
            }
            List<DateBean> dateBeans = mDateBeanLruCache.get(dateBean.monthStr);
            if (dateBeans==null || dateBeans.isEmpty()){
                return;
            }
            //是否有开始时间
            if (startDate==null){
                if (endDate==null || Integer.parseInt(endDate.day)>Integer.parseInt(dateBean.day)){
                    startDate = dateBean;
                    startDate.position = position;
                    mDateBeanLruCache.get(dateBean.monthStr).get(position).itemState = DateBean.ITEM_STATE_BEGIN_DATE;
                    mCalendarAdapter.notifyItemChanged(position,mDateBeanLruCache.get(dateBean.monthStr).get(position));
                    showDate();
                }else if (Integer.parseInt(endDate.day)<Integer.parseInt(dateBean.day)){//结束时间小于当前选中时间
                    if (endDate.level>dateBean.level){//08>07
                        startDate = dateBean;
                        startDate.position = position;
                        mDateBeanLruCache.get(dateBean.monthStr).get(position).itemState = DateBean.ITEM_STATE_BEGIN_DATE;
                        mCalendarAdapter.notifyItemChanged(position,mDateBeanLruCache.get(dateBean.monthStr).get(position));
                        showDate();
                        return;
                    }

                    mDateBeanLruCache.get(dateBean.monthStr).get(position).itemState = DateBean.ITEM_STATE_END_DATE;
                    mCalendarAdapter.notifyItemChanged(position,mDateBeanLruCache.get(dateBean.monthStr).get(position));
                    mDateBeanLruCache.get(endDate.monthStr).get(endDate.getPosition()).itemState = DateBean.ITEM_STATE_BEGIN_DATE;
                    mCalendarAdapter.notifyItemChanged(endDate.getPosition(),mDateBeanLruCache.get(endDate.monthStr).get(endDate.getPosition()));
                    startDate = endDate;
                    startDate.position = endDate.position;
                    endDate = dateBean;
                    endDate.position = position;
                    showDate();
                }
            }else {
                if (Integer.parseInt(startDate.day)>Integer.parseInt(dateBean.day)){//开始日期 大于 当前选中的日期
                    if (endDate!=null){
                        if (endDate.level>dateBean.level){
                            mDateBeanLruCache.get(startDate.monthStr).get(startDate.getPosition()).itemState = DateBean.ITEM_STATE_NORMAL;
                            mCalendarAdapter.notifyItemChanged(startDate.position,mDateBeanLruCache.get(startDate.monthStr).get(startDate.position));
                            startDate = dateBean;
                            startDate.position = position;
                            mDateBeanLruCache.get(dateBean.monthStr).get(position).itemState = DateBean.ITEM_STATE_BEGIN_DATE;
                            mCalendarAdapter.notifyItemChanged(position,mDateBeanLruCache.get(dateBean.monthStr).get(position));
                            showDate();
                            return;
                        }
                        mDateBeanLruCache.get(endDate.monthStr).get(endDate.getPosition()).itemState = DateBean.ITEM_STATE_NORMAL;
                        mCalendarAdapter.notifyItemChanged(endDate.position,mDateBeanLruCache.get(endDate.monthStr).get(endDate.position));
                        showDate();
                    }

                    if (startDate.level<dateBean.level){//08>07
                        endDate = dateBean;
                        endDate.position = position;
                        mDateBeanLruCache.get(dateBean.monthStr).get(position).itemState = DateBean.ITEM_STATE_END_DATE;
                        mCalendarAdapter.notifyItemChanged(position,mDateBeanLruCache.get(dateBean.monthStr).get(position));
                        showDate();
                        return;
                    }
                    endDate = startDate;
                    endDate.position = startDate.position;
                    mDateBeanLruCache.get(endDate.monthStr).get(endDate.getPosition()).itemState = DateBean.ITEM_STATE_END_DATE;
                    mCalendarAdapter.notifyItemChanged(endDate.getPosition(),mDateBeanLruCache.get(endDate.monthStr).get(endDate.getPosition()));
                    startDate = dateBean;
                    startDate.position = position;
                    mDateBeanLruCache.get(dateBean.monthStr).get(position).itemState = DateBean.ITEM_STATE_BEGIN_DATE;
                    mCalendarAdapter.notifyItemChanged(position,mDateBeanLruCache.get(dateBean.monthStr).get(position));
                    showDate();

                }else if (Integer.parseInt(startDate.day)<Integer.parseInt(dateBean.day)){//开始日期小于 当前选中的日期
                    if (endDate!=null){
                        if (Integer.parseInt(endDate.day)==Integer.parseInt(dateBean.day) && dateBean.level==endDate.level){
                            endDate = null;
                            mDateBeanLruCache.get(dateBean.monthStr).get(position).itemState = DateBean.ITEM_STATE_NORMAL;
                            mCalendarAdapter.notifyItemChanged(position,mDateBeanLruCache.get(dateBean.monthStr).get(position));
                            showDate();
                            return;
                        }
                        if (dateBean.level<endDate.level){
                            mDateBeanLruCache.get(startDate.monthStr).get(startDate.getPosition()).itemState = DateBean.ITEM_STATE_NORMAL;
                            mCalendarAdapter.notifyItemChanged(startDate.getPosition(),mDateBeanLruCache.get(startDate.monthStr).get(startDate.getPosition()));
                            startDate = dateBean;
                            startDate.position = position;
                            mDateBeanLruCache.get(dateBean.monthStr).get(position).itemState = DateBean.ITEM_STATE_BEGIN_DATE;
                            mCalendarAdapter.notifyItemChanged(position,mDateBeanLruCache.get(dateBean.monthStr).get(position));
                            showDate();
                            return;
                        }else {
                            mDateBeanLruCache.get(endDate.monthStr).get(endDate.getPosition()).itemState = DateBean.ITEM_STATE_NORMAL;
                            mCalendarAdapter.notifyItemChanged(endDate.position,mDateBeanLruCache.get(endDate.monthStr).get(endDate.position));
                            showDate();
                        }
                    }

                    if (startDate.level>dateBean.level){//08>07
                        endDate = startDate;
                        endDate.position = startDate.position;
                        startDate = dateBean;
                        startDate.position = position;
                        mDateBeanLruCache.get(dateBean.monthStr).get(position).itemState = DateBean.ITEM_STATE_BEGIN_DATE;
                        mCalendarAdapter.notifyItemChanged(position,mDateBeanLruCache.get(dateBean.monthStr).get(position));
                        mDateBeanLruCache.get(endDate.monthStr).get(endDate.getPosition()).itemState = DateBean.ITEM_STATE_END_DATE;
                        mCalendarAdapter.notifyItemChanged(endDate.getPosition(),mDateBeanLruCache.get(endDate.monthStr).get(endDate.getPosition()));
                        showDate();
                        return;
                    }

                    endDate = dateBean;
                    endDate.position = position;
                    dateBean.itemState = DateBean.ITEM_STATE_END_DATE;
                    mDateBeanLruCache.get(dateBean.monthStr).get(position).itemState = DateBean.ITEM_STATE_END_DATE;
                    mCalendarAdapter.notifyItemChanged(position,mDateBeanLruCache.get(dateBean.monthStr).get(position));
                    showDate();
                }else if (Integer.parseInt(startDate.day)==Integer.parseInt(dateBean.day) && dateBean.level==startDate.level){//开始日期 等于 选中日期
                    startDate = null;
                    mDateBeanLruCache.get(dateBean.monthStr).get(position).itemState = DateBean.ITEM_STATE_NORMAL;
                    mCalendarAdapter.notifyItemChanged(position,mDateBeanLruCache.get(dateBean.monthStr).get(position));
                    showDate();
                }else if (Integer.parseInt(startDate.day)==Integer.parseInt(dateBean.day) && dateBean.level>startDate.level){//日期相同 开始日期大于选中日期 ()
                    mDateBeanLruCache.get(endDate.monthStr).get(endDate.getPosition()).itemState = DateBean.ITEM_STATE_NORMAL;
                    mCalendarAdapter.notifyItemChanged(endDate.position,mDateBeanLruCache.get(endDate.monthStr).get(endDate.getPosition()));
                    endDate = dateBean;
                    endDate.position = position;
                    mDateBeanLruCache.get(dateBean.monthStr).get(position).itemState = DateBean.ITEM_STATE_END_DATE;
                    mCalendarAdapter.notifyItemChanged(position,mDateBeanLruCache.get(dateBean.monthStr).get(position));
                    showDate();
                }

            }
        });

        //DateUtils.getCurrDate(DateUtils.MONTG_DATE_FORMAT)
        initData(DateUtils.getCurrDate(DateUtils.MONTG_DATE_FORMAT));

    }


    //计算 开始时间和结束时间之间的选中
    private void showDate(){
        if (startDate==null ||endDate==null) return;


        //算出
        List<DateBean> startDateBeanContainer = mDateBeanLruCache.get(startDate.monthStr);
        DateBean startDateBean = mDateBeanLruCache.get(startDate.monthStr).get(startDate.getPosition());
        int startLevel = startDateBean.getLevel();

        List<DateBean> endDateBeanContainer = mDateBeanLruCache.get(endDate.monthStr);
        DateBean endDateBean = mDateBeanLruCache.get(endDate.monthStr).get(endDate.getPosition());
        int endLevel = endDateBean.getLevel();

        if (startLevel==endLevel){//同一月份
            //清楚之前的状态
            resetAllStateSelected();


            for (int i = startDate.getPosition()+1; i < endDate.getPosition(); i++) {
                mDateBeanLruCache.get(startDate.monthStr).get(i).itemState=DateBean.ITEM_STATE_SELECTED;
                mCalendarAdapter.notifyItemChanged(i,mDateBeanLruCache.get(startDate.monthStr).get(i));
            }


        }else {
            //清楚之前的状态
            resetAllStateSelected();

            for (int i= startDate.getPosition()+1;i<startDateBeanContainer.size();i++){
                mDateBeanLruCache.get(startDate.monthStr).get(i).itemState=DateBean.ITEM_STATE_SELECTED;
                //mCalendarAdapter.notifyItemChanged(i,mDateBeanLruCache.get(startDate.monthStr).get(i));
            }

            for (int i=0;i<endDate.getPosition();i++){
                mDateBeanLruCache.get(endDate.monthStr).get(i).itemState=DateBean.ITEM_STATE_SELECTED;
            }
            //间隔超过一个月
            if (startLevel+1<endLevel){
                String[] split = startDate.monthStr.split("-");
                int year = Integer.parseInt(split[0]);
                int  week = Integer.parseInt(split[1]);
                int nextWeek = 0;
                int currentYear = 0;
                if (week>=12){
                    nextWeek = 1;
                    currentYear = year+1;
                }else {
                    currentYear = year;
                    nextWeek = week+1;
                }
                String key = currentYear + "-" + (nextWeek < 10 ? "0" + nextWeek : nextWeek);
                for (int i = 0; i < mDateBeanLruCache.get(key).size(); i++) {
                    mDateBeanLruCache.get(key).get(i).itemState=DateBean.ITEM_STATE_SELECTED;
                }


            }

            //间隔一个月 及多个月份
//            for (int i = startLevel; i <= endLevel; i++) {
//                for (int i=Integer.parseInt(startDateBean.getDay())+2;i
//
//                }
//            }

        }
    }



    @SuppressLint("NotifyDataSetChanged")
    private void resetAllStateSelected() {
        Iterator<Map.Entry<String, List<DateBean>>> iterator = mDateBeanLruCache.snapshot().entrySet().iterator();
        while (iterator.hasNext()) {
            List<DateBean> value = iterator.next().getValue();
            for (int i = 0; i < value.size(); i++) {
                if (value.get(i).itemState==DateBean.ITEM_STATE_SELECTED){

                    value.get(i).itemState = DateBean.ITEM_STATE_NORMAL;
                }
            }
            mCalendarAdapter.notifyDataSetChanged();
        }
    }




    private void initData(String monthStr) {
        if (mDateBeanLruCache.get(monthStr)!=null && !mDateBeanLruCache.get(monthStr).isEmpty()){
            mCalendarAdapter.initMDatas(mDateBeanLruCache.get(monthStr));
            return;
        }
        int level = Integer.parseInt(DateUtils.getLastDayOfMonth(DateUtils.stringtoDate(monthStr,DateUtils.MONTG_DATE_FORMAT),"MM"));

        List < DateBean > dateBeans = new ArrayList<>();
        //先设置月份的
        DateBean monthBean = new DateBean();
        monthBean.setItemType(DateBean.item_type_month);
        monthBean.setMonthStr(monthStr);
        monthBean.setLevel(level);
        dateBeans.add(monthBean);

        //设置当前月的天数 获取当前月的第一天和最后一天
        int firstDayOfMonth = Integer.parseInt(DateUtils.getFirstDayOfMonth(DateUtils.stringtoDate(monthStr,DateUtils.MONTG_DATE_FORMAT),DateUtils.FORMAT_DATE));
        int lastDayOfMonth = Integer.parseInt(DateUtils.getLastDayOfMonth(DateUtils.stringtoDate(monthStr,DateUtils.MONTG_DATE_FORMAT),DateUtils.FORMAT_DATE));



        String week = DateUtils.getWeek(DateUtils.stringtoDate(monthStr+"-01",DateUtils.LONG_DATE_FORMAT));
        switch (week){
            case "星期一":
                addDatePlaceholder(dateBeans,1,monthStr,level);
                break;
            case "星期二":
                addDatePlaceholder(dateBeans,2,monthStr,level);
                break;
            case "星期三":
                addDatePlaceholder(dateBeans,3,monthStr,level);
                break;
            case "星期四":
                addDatePlaceholder(dateBeans,4,monthStr,level);
                break;
            case "星期五":
                addDatePlaceholder(dateBeans,5,monthStr,level);
                break;
            case "星期六":
                addDatePlaceholder(dateBeans,6,monthStr,level);
                break;
        }


        for (int i=firstDayOfMonth;i<=lastDayOfMonth;i++){
            DateBean dayBean = new DateBean();
            dayBean.setItemType(DateBean.item_type_day);
            dayBean.setMonthStr(monthStr);
            dayBean.setDay(String.valueOf(i));
            dayBean.setLevel(level);

            dayBean.setItemState(DateBean.ITEM_STATE_NORMAL);
            dateBeans.add(dayBean);
        }
        mDateBeanLruCache.put(monthStr,dateBeans);
        mCalendarAdapter.initMDatas(dateBeans);
    }

    private void addDatePlaceholder(List<DateBean> dateBeans, int count, String monthStr,int level) {
        for (int i = 0; i < count; i++) {
            DateBean dateBean = new DateBean();
            dateBean.setItemType(DateBean.item_type_day);
            dateBean.setMonthStr(monthStr);
            dateBean.setLevel(level);
            dateBeans.add(dateBean);
        }
    }
}

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这里通过LRUcache 默认只记录最近使用的3个月份的数据，如果有其他的需求可以直接使用HashMap记录总数据(这里只是一个实现方式)

这只是本人的初步完成的一个稿图，如果有其他的需求，可以在上面的实体类中进行修改，从而完成自己的需求。

扩展类

DateUtils.class

public class DateUtils {

    // 格式：年－月－日 小时：分钟：秒
    public static final String FORMAT_ONE = "yyyy-MM-dd HH:mm:ss";

    // 格式：年－月－日 小时：分钟
    public static final String FORMAT_TWO = "yyyy-MM-dd HH:mm";
    // 格式：M月d
    public static final String SHORT_DATE_MONTH_FORMAT = "MM/dd";
    // 格式：年月日 小时分钟秒
    public static final String FORMAT_THREE = "yyyyMMdd-HHmmss";

    // 格式：年－月－日
    public static final String LONG_DATE_FORMAT = "yyyy-MM-dd";
    // 格式：yyyyMMdd
    public static final String LONG_DATE_FORMAT_TWO = "yyyyMMdd";
    //格式不 补零
    public static final String LONG_NO_ZOO_FORMAT = "yyyy-M-d";
    //格式 年
    public static final String YEAR_FORMAT = "yyyy年";
    // 格式：月－日
    public static final String SHORT_DATE_FORMAT = "MM-dd";

    public static final String FORMAT_DATE = "dd";

    //格式：04月-21日
    public static final String SHORT_DATE_FORMAT_TYPE = "MM月dd日";

    // 格式：小时：分钟：秒
    public static final String LONG_TIME_FORMAT = "HH:mm:ss";

    // 格式 ：小时：分钟
    public static final String HOUR_MINUTE = "HH:mm";

    // 格式：年-月
    public static final String MONTG_DATE_FORMAT = "yyyy-MM";
    // 年的加减
    public static final int SUB_YEAR = Calendar.YEAR;

    // 月加减
    public static final int SUB_MONTH = Calendar.MONTH;

    // 天的加减
    public static final int SUB_DAY = Calendar.DATE;

    // 小时的加减
    public static final int SUB_HOUR = Calendar.HOUR;

    // 分钟的加减
    public static final int SUB_MINUTE = Calendar.MINUTE;

    // 秒的加减
    public static final int SUB_SECOND = Calendar.SECOND;

    // 格式：月－日-时-分
    public static final String SHORT_DATE_FORMAT_LONG_TIME = "MM-dd HH:mm";

    public static final String LONG_SECONDS_FORMAT = "mm:ss";

    private static String datePattern = "MM/dd/yyyy";

    private static String timePattern = datePattern + " HH:MM a";
    // 格式：年-月-日
    public static final String MONTG_DATE_FORMAT_YEAR_DAY = "yyyy年MM月dd日";
    // 格式：年-月
    public static final String MONTG_DATE_FORMAT_YEAR = "yyyy年MM月";
    // 格式：年-月-日 时-分
    public static final String DATE_FORMAT_YEAR_MONTH_DAY_HOUR_MIN = "yyyy年MM月dd日 HH:mm";
    // 格式：年-月-日 时-分-秒
    public static final String DATE_FORMAT_YEAR_MONTH_DAY_HOUR_MIN_SECOND = "yyyy年MM月dd日 HH:mm:ss";

    /**
     * Return default datePattern (MM/dd/yyyy)
     *
     * @return a string representing the date pattern on the UI
     */
    public static String getDatePattern() {
        return datePattern;
    }

    static final String dayNames[] = {"星期日", "星期一", "星期二", "星期三", "星期四",
            "星期五", "星期六"};

    @SuppressWarnings("unused")
    private static final SimpleDateFormat timeFormat = new SimpleDateFormat(
            "yyyy-MM-dd HH:mm:ss");

    public DateUtils() {
    }

    /**
     * 周代码转换
     *
     * @param week
     * @return
     */
    public static String DateToWeek(String week) {
        String day = null;
        if ("1".equals(week)) {
            day = "日";
        } else if ("2".equals(week)) {
            day = "一";
        } else if ("3".equals(week)) {
            day = "二";
        } else if ("4".equals(week)) {
            day = "三";
        } else if ("5".equals(week)) {
            day = "四";
        } else if ("6".equals(week)) {
            day = "五";
        } else if ("7".equals(week)) {
            day = "六";
        }

        return day;
    }

    /**
     * 把符合日期格式的字符串转换为日期类型
     *
     * @param dateStr
     * @return
     */
    public static Date stringtoDate(String dateStr, String format) {
        Date d = null;
        SimpleDateFormat formater = new SimpleDateFormat(format);
        try {
            formater.setLenient(false);
            d = formater.parse(dateStr);
        } catch (Exception e) {
            // log.error(e);
            d = null;
        }
        return d;
    }

    /**
     * 把符合日期格式的字符串转换为日期类型
     */
    public static Date stringtoDate(String dateStr, String format,
                                    ParsePosition pos) {
        Date d = null;
        SimpleDateFormat formater = new SimpleDateFormat(format);
        try {
            formater.setLenient(false);
            d = formater.parse(dateStr, pos);
        } catch (Exception e) {
            d = null;
        }
        return d;
    }

    /**
     * 把日期转换为字符串
     *
     * @param date
     * @return
     */
    public static String dateToString(Date date, String format) {
        String result = "";
        SimpleDateFormat formater = new SimpleDateFormat(format);
        try {
            result = formater.format(date);
        } catch (Exception e) {
            // log.error(e);
        }
        return result;
    }

    /**
     * 获取当前时间的指定格式
     *
     * @param format
     * @return
     */
    public static String getCurrDate(String format) {
        return dateToString(new Date(), format);
    }

    /**
     * 获取当前时间 yyyy-mm-dd hh:mm:ss
     */
    @SuppressLint("SimpleDateFormat")
    public static String getCurrentTime() {
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date curDate = new Date(System.currentTimeMillis());// 获取当前时间
        return formatter.format(curDate);
    }

    /**
     * @param dateStr
     * @param amount
     * @return
     */
    public static String dateSub(int dateKind, String dateStr, int amount) {
        Date date = stringtoDate(dateStr, FORMAT_ONE);
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(dateKind, amount);
        return dateToString(calendar.getTime(), FORMAT_ONE);
    }

    /**
     * 两个日期相减
     *
     * @param firstTime
     * @param secTime
     * @return 相减得到的秒数
     */
    public static long timeSub(String firstTime, String secTime) {
        long first = stringtoDate(firstTime, FORMAT_ONE).getTime();
        long second = stringtoDate(secTime, FORMAT_ONE).getTime();
        return (second - first) / 1000;
    }

    /**
     * 转换日期格式
     *
     * @param serverTime
     * @return
     */
    public static String getConversionTime(String serverTime, String format) {
        return dateToString(stringtoDate(serverTime, FORMAT_ONE), format);
    }

    /**
     * 时间精确计算
     *
     * @param serverTime
     */
    public static String getAccurateTime(String serverTime) {
        String alert = "";
        long dif = stringtoDate(getCurrDate(FORMAT_ONE), FORMAT_ONE).getTime() - stringtoDate(serverTime, FORMAT_ONE).getTime();
        if (dif < 60 * 1000) {
            alert = "刚刚";
            return alert;
        } else if (dif < 60 * 60 * 1000) {
            alert = (int) dif / 60 / 1000 + "分钟前";
            return alert;
        } else if (dif < 60 * 1000 * 60 * 24) {
            alert = (int) dif / 60 / 60 / 1000 + "小时前";
            return alert;
        } else if (dif > 60 * 60 * 1000 * 24 && dif < 60 * 60 * 1000 * 48) {
            alert = "昨天" + getConversionTime(serverTime, HOUR_MINUTE);
            return alert;
        } else {
            return dateToString(stringtoDate(serverTime, DateUtils.FORMAT_ONE), DateUtils.FORMAT_TWO);
        }
    }


    /**
     * 获得某月的天数
     *
     * @param year  int
     * @param month int
     * @return int
     */
    public static int getDaysOfMonth(String year, String month) {
        int days = 0;
        if (month.equals("1") || month.equals("3") || month.equals("5")
                || month.equals("7") || month.equals("8") || month.equals("10")
                || month.equals("12")) {
            days = 31;
        } else if (month.equals("4") || month.equals("6") || month.equals("9")
                || month.equals("11")) {
            days = 30;
        } else {
            if ((Integer.parseInt(year) % 4 == 0 && Integer.parseInt(year) % 100 != 0)
                    || Integer.parseInt(year) % 400 == 0) {
                days = 29;
            } else {
                days = 28;
            }
        }

        return days;
    }

    /**
     * 获取某年某月的天数
     *
     * @param year  int
     * @param month int 月份[1-12]
     * @return int
     */
    public static int getDaysOfMonth(int year, int month) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(year, month - 1, 1);
        return calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
    }

    /**
     * 获得当前日期
     *
     * @return int
     */
    public static int getToday() {
        Calendar calendar = Calendar.getInstance();
        return calendar.get(Calendar.DATE);
    }

    /**
     * 获得当前月份
     *
     * @return int
     */
    public static int getToMonth() {
        Calendar calendar = Calendar.getInstance();
        return calendar.get(Calendar.MONTH) + 1;
    }

    /**
     * 获得当前年份
     *
     * @return int
     */
    public static int getToYear() {
        Calendar calendar = Calendar.getInstance();
        return calendar.get(Calendar.YEAR);
    }

    /**
     * 返回日期的天
     *
     * @param date Date
     * @return int
     */
    public static int getDay(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        return calendar.get(Calendar.DATE);
    }

    /**
     * 返回日期的年
     *
     * @param date Date
     * @return int
     */
    public static int getYear(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        return calendar.get(Calendar.YEAR);
    }

    /**
     * 返回日期的周
     *
     * @param date
     * @return
     */
    public static String getWeek(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        return dayNames[calendar.get(Calendar.DAY_OF_WEEK) - 1];
    }

    /**
     * 返回日期当前属于周几
     *
     * @param date
     * @return
     */
    public static int getCurrentWeekIndex(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        return calendar.get(Calendar.DAY_OF_WEEK) - 1;
    }

    /**
     * 返回日期所在周的周一
     *
     * @param date
     * @return
     */
    public static String getDateWeekMonday(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        int week = 0;
        if (calendar.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY) {
            week = 6;
        } else {
            week = calendar.get(Calendar.DAY_OF_WEEK) - 2;
        }
        calendar.add(Calendar.DAY_OF_YEAR, -week);
        return dateToString(calendar.getTime(), LONG_DATE_FORMAT);
    }

    /**
     * 返回日期所在周的周一
     *
     * @param date
     * @return
     */
    public static String getWeekMonday(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        int week = 0;
        if (calendar.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY) {
            week = 6;
        } else {
            week = calendar.get(Calendar.DAY_OF_WEEK) - 2;
        }
        calendar.add(Calendar.DAY_OF_YEAR, -week);
        return dateToString(calendar.getTime(), LONG_DATE_FORMAT);
    }

    /**
     * 得到本周周一
     *
     * @param date
     */
    public static String getMondayOfThisWeek(Date date) {
        Calendar c = Calendar.getInstance();
        c.setTime(date);
        int day_of_week = c.get(Calendar.DAY_OF_WEEK) - 1;
        if (day_of_week == 0)
            day_of_week = 7;
        c.add(Calendar.DATE, -day_of_week + 1);
        return dateToString(c.getTime(), LONG_DATE_FORMAT);
    }

    /**
     * 得到本周周日
     *
     * @param date
     */
    public static String getSundayOfThisWeek(Date date) {
        Calendar c = Calendar.getInstance();
        c.setTime(date);
        int day_of_week = c.get(Calendar.DAY_OF_WEEK) - 1;
        if (day_of_week == 0)
            day_of_week = 7;
        c.add(Calendar.DATE, -day_of_week + 7);
        return dateToString(c.getTime(), LONG_DATE_FORMAT);
    }

    /**
     * 返回日期所在下周的周一
     *
     * @param date
     * @return
     */
    public static String getNextWeekMonday(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.WEEK_OF_MONTH, 1);
        int week = 0;
        if (calendar.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY) {
            week = calendar.get(Calendar.DAY_OF_WEEK) - 1;
        } else {
            week = calendar.get(Calendar.DAY_OF_WEEK) - 2;
        }

        calendar.add(Calendar.DAY_OF_YEAR, -week);
        return dateToString(calendar.getTime(), LONG_DATE_FORMAT);
    }

    /**
     * 返回日期所在上周的周一
     *
     * @param date
     * @return
     */
    public static String getLastWeekMonday(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.WEEK_OF_MONTH, -1);
        int week = calendar.get(Calendar.DAY_OF_WEEK) - 2;
        calendar.add(Calendar.DAY_OF_YEAR, -week);
        return dateToString(calendar.getTime(), LONG_DATE_FORMAT);
    }

    /**
     * 返回日期所在周的周日
     *
     * @param date
     * @return
     */
    public static String getWeekSunday(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        int week = 7 - (calendar.get(Calendar.DAY_OF_WEEK) - 1);
        calendar.add(Calendar.DAY_OF_YEAR, week);
        return dateToString(calendar.getTime(), LONG_DATE_FORMAT);
    }

    /**
     * 返回日期所在下周的周日
     *
     * @param date
     * @return
     */
    public static String getNextWeekSunday(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.WEEK_OF_MONTH, 1);
        int week = 7 - (calendar.get(Calendar.DAY_OF_WEEK) - 1);
        calendar.add(Calendar.DAY_OF_YEAR, week);
        return dateToString(calendar.getTime(), LONG_DATE_FORMAT);
    }

    /**
     * 返回日期所在下一周周一的日期
     *
     * @param date
     * @return
     */
    public static String getLastWeekSunday(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.WEEK_OF_MONTH, -1);
        int week = 7 - (calendar.get(Calendar.DAY_OF_WEEK) - 1);
        calendar.add(Calendar.DAY_OF_YEAR, week);
        return dateToString(calendar.getTime(), LONG_DATE_FORMAT);
    }

    /**
     * 根据开始日期和结束日期，获取两个日期之间周数
     *
     * @param iBegin
     * @param iEnd
     * @return
     */
    public static int getWeek(Date iBegin, Date iEnd) {

        // 获取第一周周一的日期
        Date beginWeek = stringtoDate(getWeekMonday(iBegin), LONG_DATE_FORMAT);
        // 获取最后一周下周周一的日期
        Date endWeek = stringtoDate(getNextWeekMonday(iEnd), LONG_DATE_FORMAT);
        long day = dayDiff(beginWeek, endWeek);
        int weeks = 0;
        if (day > 0) {
            weeks = (int) (day / 7);
        }

        return weeks;
    }

    /**
     * 根据开始日期，获取当前时间的周次
     *
     * @param iBegin
     * @return
     */
    public static int getCurrentWeek(Date iBegin) {

        // 获取第一周周一的日期
        Date beginWeek = stringtoDate(getWeekMonday(iBegin), LONG_DATE_FORMAT);
        // 获取当前周 下周周一的日期
        Date endWeek = stringtoDate(
                getNextWeekMonday(stringtoDate(getCurrDate(LONG_DATE_FORMAT),
                        LONG_DATE_FORMAT)), LONG_DATE_FORMAT);
        long day = dayDiff(beginWeek, endWeek);
        int weeks = 0;
        if (day > 0) {
            weeks = (int) (day / 7);
        }

        return weeks;
    }

    /**
     * 返回日期的月份，1-12
     *
     * @param date Date
     * @return int
     */
    public static int getMonth(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        return calendar.get(Calendar.MONTH) + 1;
    }

    /**
     * 计算两个日期相差的天数，如果date2 > date1 返回正数，否则返回负数
     *
     * @param date1 Date
     * @param date2 Date
     * @return long
     */
    public static long dayDiff(Date date1, Date date2) {
        return (date2.getTime() - date1.getTime()) / 86400000;
    }

    /**
     * 比较两个日期的年差
     *
     * @param before
     * @param after
     * @return
     */
    public static int yearDiff(String before, String after) {
        Date beforeDay = stringtoDate(before, LONG_DATE_FORMAT);
        Date afterDay = stringtoDate(after, LONG_DATE_FORMAT);
        return getYear(afterDay) - getYear(beforeDay);
    }

    /**
     * 比较指定日期与当前日期的差
     *
     * @param after
     * @return
     */
    public static int yearDiffCurr(String after) {
        Date beforeDay = new Date();
        Date afterDay = stringtoDate(after, LONG_DATE_FORMAT);
        return getYear(beforeDay) - getYear(afterDay);
    }

    /**
     * 比较指定日期与当前日期的差
     *
     * @param before
     * @return
     * @author chenyz
     */
    public static long dayDiffCurr(String before) {
        Date currDate = DateUtils.stringtoDate(currDay(), LONG_DATE_FORMAT);
        Date beforeDate = stringtoDate(before, LONG_DATE_FORMAT);
        return (currDate.getTime() - beforeDate.getTime()) / 86400000;

    }

    /**
     * 获取每月的第一周
     *
     * @param year
     * @param month
     * @return
     * @author chenyz
     */
    public static int getFirstWeekdayOfMonth(int year, int month) {
        Calendar c = Calendar.getInstance();
        c.setFirstDayOfWeek(Calendar.SATURDAY); // 星期天为第一天
        c.set(year, month - 1, 1);
        return c.get(Calendar.DAY_OF_WEEK);
    }

    /**
     * 获取每月的最后一周
     *
     * @param year
     * @param month
     * @return
     * @author chenyz
     */
    public static int getLastWeekdayOfMonth(int year, int month) {
        Calendar c = Calendar.getInstance();
        c.setFirstDayOfWeek(Calendar.SATURDAY); // 星期天为第一天
        c.set(year, month - 1, getDaysOfMonth(year, month));
        return c.get(Calendar.DAY_OF_WEEK);
    }

    /**
     * 获得当前日期字符串，格式"yyyy_MM_dd_HH_mm_ss"
     *
     * @return
     */
    public static String getCurrent() {
        Calendar cal = Calendar.getInstance();
        cal.setTime(new Date());
        int year = cal.get(Calendar.YEAR);
        int month = cal.get(Calendar.MONTH) + 1;
        int day = cal.get(Calendar.DAY_OF_MONTH);
        int hour = cal.get(Calendar.HOUR_OF_DAY);
        int minute = cal.get(Calendar.MINUTE);
        int second = cal.get(Calendar.SECOND);
        StringBuffer sb = new StringBuffer();
        sb.append(year).append("_").append(addzero(month, 2)).append("_")
                .append(addzero(day, 2)).append("_").append(addzero(hour, 2))
                .append("_").append(addzero(minute, 2)).append("_")
                .append(addzero(second, 2));
        return sb.toString();
    }

    /**
     * 获得当前日期字符串，格式"yyyy-MM-dd HH:mm:ss"
     *
     * @return
     */
    public static String getNow() {
        Calendar today = Calendar.getInstance();
        return dateToString(today.getTime(), FORMAT_ONE);
    }

    /**
     * 获取当前时间
     *
     * @param strFormat --指定格式
     * @return
     */
    public static String getNow(String strFormat) {
        Calendar today = Calendar.getInstance();
        return dateToString(today.getTime(), strFormat);
    }

    /**
     * 判断日期是否有效,包括闰年的情况
     *
     * @param date YYYY-mm-dd
     * @return
     */
    public static boolean isDate(String date) {
        StringBuffer reg = new StringBuffer(
                "^((\\d{2}(([02468][048])|([13579][26]))-?((((0?");
        reg.append("[13578])|(1[02]))-?((0?[1-9])|([1-2][0-9])|(3[01])))");
        reg.append("|(((0?[469])|(11))-?((0?[1-9])|([1-2][0-9])|(30)))|");
        reg.append("(0?2-?((0?[1-9])|([1-2][0-9])))))|(\\d{2}(([02468][12");
        reg.append("35679])|([13579][01345789]))-?((((0?[13578])|(1[02]))");
        reg.append("-?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))");
        reg.append("-?((0?[1-9])|([1-2][0-9])|(30)))|(0?2-?((0?[");
        reg.append("1-9])|(1[0-9])|(2[0-8]))))))");
        Pattern p = Pattern.compile(reg.toString());
        return p.matcher(date).matches();
    }

    /**
     * 取得指定日期过 months 月后的日期 (当 months 为负数表示指定月之前);
     *
     * @param date   日期 为null时表示当天
     * @param months 相加(相减)的月数
     */
    public static Date nextMonth(Date date, int months) {
        Calendar cal = Calendar.getInstance();
        if (date != null) {
            cal.setTime(date);
        }
        cal.add(Calendar.MONTH, months);
        return cal.getTime();
    }

    /**
     * 取得指定日期过 day 天后的日期 (当 day 为负数表示指日期之前);
     *
     * @param date 日期 为null时表示当天
     */
    public static Date nextDay(Date date, int day) {

        Calendar cal = Calendar.getInstance();
        if (date != null) {
            cal.setTime(date);
        }
        cal.add(Calendar.DAY_OF_YEAR, day);
        return cal.getTime();
    }

    /**
     * 取得距离今天 day 日的日期
     *
     * @param day
     * @param format
     * @return
     * @author chenyz
     */
    public static String nextDay(int day, String format) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(new Date());
        cal.add(Calendar.DAY_OF_YEAR, day);
        return dateToString(cal.getTime(), format);
    }

    /**
     * 取得指定日期过 day 周后的日期 (当 day 为负数表示指定月之前)
     *
     * @param date 日期 为null时表示当天
     */
    public static Date nextWeek(Date date, int week) {
        Calendar cal = Calendar.getInstance();
        if (date != null) {
            cal.setTime(date);
        }
        cal.add(Calendar.WEEK_OF_MONTH, week);
        return cal.getTime();
    }

    /**
     * 获取当前的日期(yyyy-MM-dd)
     */
    public static String currDay() {
        return DateUtils.dateToString(new Date(), DateUtils.LONG_DATE_FORMAT);
    }

    /**
     * 获取昨天的日期
     *
     * @return
     */
    public static String befoDay() {
        return befoDay(DateUtils.LONG_DATE_FORMAT);
    }

    /**
     * 根据时间类型获取昨天的日期
     *
     * @param format
     * @return
     * @author chenyz
     */
    public static String befoDay(String format) {
        return DateUtils.dateToString(DateUtils.nextDay(new Date(), -1), format);
    }

    /**
     * 获取明天的日期
     */
    public static String tomorrowDay() {
        return DateUtils.dateToString(DateUtils.nextDay(new Date(), 1),
                DateUtils.LONG_DATE_FORMAT);
    }

    /**
     * 获取明天的日期(yyyy-mm-dd hh:mm:ss)
     */
    public static String tomorrowDayTime() {
        return nextDay(1, DateUtils.FORMAT_ONE);
    }

    /**
     * 获取后天的日期(yyyy-mm-dd hh:mm:ss)
     */
    public static String afterDayTime() {
        return nextDay(2, DateUtils.FORMAT_ONE);
    }

    /**
     * 取得当前时间距离1900/1/1的天数
     *
     * @return
     */
    public static int getDayNum() {
        int daynum = 0;
        GregorianCalendar gd = new GregorianCalendar();
        Date dt = gd.getTime();
        GregorianCalendar gd1 = new GregorianCalendar(1900, 1, 1);
        Date dt1 = gd1.getTime();
        daynum = (int) ((dt.getTime() - dt1.getTime()) / (24 * 60 * 60 * 1000));
        return daynum;
    }

    /**
     * getDayNum的逆方法(用于处理Excel取出的日期格式数据等)
     *
     * @param day
     * @return
     */
    public static Date getDateByNum(int day) {
        GregorianCalendar gd = new GregorianCalendar(1900, 1, 1);
        Date date = gd.getTime();
        date = nextDay(date, day);
        return date;
    }

    /**
     * 针对yyyy-MM-dd HH:mm:ss格式,显示yyyymmdd
     */
    public static String getYmdDateCN(String datestr) {
        if (datestr == null)
            return "";
        if (datestr.length() < 10)
            return "";
        StringBuffer buf = new StringBuffer();
        buf.append(datestr.substring(0, 4)).append(datestr.substring(5, 7))
                .append(datestr.substring(8, 10));
        return buf.toString();
    }

    /**
     * 获取本月第一天
     *
     * @param format
     * @return
     */
    public static String getFirstDayOfMonth(String format) {
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.DATE, 1);
        return dateToString(cal.getTime(), format);
    }

    /**
     * 获取某月第一天
     *
     * @param iDate
     * @param format
     * @return
     */
    public static String getFirstDayOfMonth(Date iDate, String format) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(iDate);
        cal.set(Calendar.DATE, 1);
        return dateToString(cal.getTime(), format);
    }

    /**
     * 获取本月最后一天
     *
     * @param format
     * @return
     */
    public static String getLastDayOfMonth(String format) {
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.DATE, 1);
        cal.add(Calendar.MONTH, 1);
        cal.add(Calendar.DATE, -1);
        return dateToString(cal.getTime(), format);
    }

    /**
     * 获取某月最后一天
     *
     * @param format
     * @return
     */
    public static String getLastDayOfMonth(Date iDate, String format) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(iDate);
        cal.set(Calendar.DATE, 1);
        cal.add(Calendar.MONTH, 1);
        cal.add(Calendar.DATE, -1);
        return dateToString(cal.getTime(), format);
    }

    /**
     * 将元数据前补零，补后的总长度为指定的长度，以字符串的形式返回
     *
     * @param sourceDate
     * @param formatLength
     * @return 重组后的数据
     */
    public static String addzero(int sourceDate, int formatLength) {
        /*
         * 0 指前面补充零 formatLength 字符总长度为 formatLength d 代表为正数。
         */
        String newString = String.format("%0" + formatLength + "d", sourceDate);
        return newString;
    }

    /**
     * 判断是否在2个时间点内
     *
     * @param iStartDate  开始时间
     * @param iEndDate    结束时间
     * @param iSelectDate 选择的时间
     * @return
     */
    public static Boolean isTimeQuantum(String iStartDate, String iEndDate,
                                        String iSelectDate) {
        int startDiff = yearDiff(iStartDate, iSelectDate);
        int endDiff = yearDiff(iSelectDate, iEndDate);
        if (startDiff >= 0 && endDiff > 0) {
            return true;
        } else {
            return false;
        }
    }

    public static final Date str2Date(String aMask, String strDate)
            throws ParseException {
        SimpleDateFormat df = null;
        Date date = null;
        df = new SimpleDateFormat(aMask);

        try {
            date = df.parse(strDate);
        } catch (ParseException pe) {
            return null;
        } catch (java.text.ParseException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }

        return (date);
    }

    public static final String date2Str(Date aDate) {
        SimpleDateFormat df = null;
        String returnValue = "";

        if (aDate != null) {
            df = new SimpleDateFormat(datePattern);
            returnValue = df.format(aDate);
        }

        return (returnValue);
    }

    public static final String date2Str(String pattern, Date aDate) {
        SimpleDateFormat df = null;
        String returnValue = "";

        if (aDate != null) {
            df = new SimpleDateFormat(pattern);
            returnValue = df.format(aDate);
        }
        return (returnValue);
    }

    // 日期格式转换成时间戳
    public static long getTimeStamp(String pattern, String strDate) {
        long returnTimeStamp = 0;
        Date aDate = null;
        try {
            aDate = convertStringToDate(pattern, strDate);
        } catch (ParseException pe) {
            aDate = null;
        }
        if (aDate == null) {
            returnTimeStamp = 0;
        } else {
            returnTimeStamp = aDate.getTime();
        }
        return returnTimeStamp;
    }

    /**
     * This method converts a String to a date using the datePattern
     *
     * @param strDate the date to convert (in format MM/dd/yyyy)
     * @return a date object
     * @throws ParseException
     */
    public static Date convertStringToDate(String strDate)
            throws ParseException {
        Date aDate = null;

        try {

            aDate = convertStringToDate(datePattern, strDate);
        } catch (ParseException pe) {
            // log.error("Could not convert '" + strDate
            // + "' to a date, throwing exception");
            pe.printStackTrace();
            return null;

        }
        return aDate;
    }

    /**
     * This method generates a string representation of a date/time in the
     * format you specify on input
     *
     * @param aMask   the date pattern the string is in
     * @param strDate a string representation of a date
     * @return a converted Date object
     * @throws ParseException
     * @see SimpleDateFormat
     */
    public static final Date convertStringToDate(String aMask, String strDate)
            throws ParseException {
        SimpleDateFormat df = null;
        Date date = null;
        df = new SimpleDateFormat(aMask);

        try {
            date = df.parse(strDate);
        } catch (ParseException pe) {
            return null;
        } catch (java.text.ParseException e) {
            e.printStackTrace();
        }

        return (date);
    }

    /**
     * 时间戳格式转换
     */
    public static String getNewChatTime(long timesamp) {
        String result = "";
        Calendar todayCalendar = Calendar.getInstance();
        Calendar otherCalendar = Calendar.getInstance();
        otherCalendar.setTimeInMillis(timesamp);

        String timeFormat = "M月d日 HH:mm";
        String yearTimeFormat = "yyyy年M月d日 HH:mm";
//        String am_pm = "";
//        int hour = otherCalendar.get(Calendar.HOUR_OF_DAY);
//        if (hour >= 0 && hour < 6) {
//            am_pm = "凌晨";
//        } else if (hour >= 6 && hour < 12) {
//            am_pm = "早上";
//        } else if (hour == 12) {
//            am_pm = "中午";
//        } else if (hour > 12 && hour < 18) {
//            am_pm = "下午";
//        } else if (hour >= 18) {
//            am_pm = "晚上";g
//        }
//        timeFormat = "M月d日 " + am_pm + "HH:mm";
//        yearTimeFormat = "yyyy年M月d日 " + am_pm + "HH:mm";

        timeFormat = "M月d日 " + "HH:mm";
        yearTimeFormat = "yyyy年M月d日 " + "HH:mm";

        boolean yearTemp = todayCalendar.get(Calendar.YEAR) == otherCalendar.get(Calendar.YEAR);
        if (yearTemp) {
            int todayMonth = todayCalendar.get(Calendar.MONTH);
            int otherMonth = otherCalendar.get(Calendar.MONTH);
            if (todayMonth == otherMonth) {//表示是同一个月
                int temp = todayCalendar.get(Calendar.DATE) - otherCalendar.get(Calendar.DATE);
                switch (temp) {
                    case 0:
                        result = getHourAndMin(timesamp);
                        break;
                    case 1:
                        result = "昨天 " + getHourAndMin(timesamp);
                        break;
                    case 2:
                    case 3:
                    case 4:
                    case 5:
                    case 6:
                        int dayOfMonth = otherCalendar.get(Calendar.WEEK_OF_MONTH);
                        int todayOfMonth = todayCalendar.get(Calendar.WEEK_OF_MONTH);
                        if (dayOfMonth == todayOfMonth) {//表示是同一周
                            int dayOfWeek = otherCalendar.get(Calendar.DAY_OF_WEEK);
                            if (dayOfWeek != 1) {//判断当前是不是星期日     如想显示为：周日 12:09 可去掉此判断
                                result = dayNames[otherCalendar.get(Calendar.DAY_OF_WEEK) - 1] + getHourAndMin(timesamp);
                            } else {
                                result = getTime(timesamp, timeFormat);
                            }
                        } else {
                            result = getTime(timesamp, timeFormat);
                        }
                        break;
                    default:
                        result = getTime(timesamp, timeFormat);
                        break;
                }
            } else {
                result = getTime(timesamp, timeFormat);
            }
        } else {
            result = getYearTime(timesamp, yearTimeFormat);
        }
        return result;
    }

    /**
     * 当天的显示时间格式
     *
     * @param time
     * @return
     */
    public static String getHourAndMin(long time) {
        SimpleDateFormat format = new SimpleDateFormat("HH:mm");
        return format.format(new Date(time));
    }

    /**
     * 不同一周的显示时间格式
     *
     * @param time
     * @param timeFormat
     * @return
     */
    public static String getTime(long time, String timeFormat) {
        SimpleDateFormat format = new SimpleDateFormat(timeFormat);
        return format.format(new Date(time));
    }

    /**
     * 不同年的显示时间格式
     *
     * @param time
     * @param yearTimeFormat
     * @return
     */
    public static String getYearTime(long time, String yearTimeFormat) {
        SimpleDateFormat format = new SimpleDateFormat(yearTimeFormat);
        return format.format(new Date(time));
    }

    /**
     * 秒换算为时分秒
     *
     * @param second
     * @return
     */
    public static String cal(int second) {
        int h = 0;
        int d = 0;
        int s = 0;
        int temp = second % 3600;
        if (second > 3600) {
            h = second / 3600;
            if (temp != 0) {
                if (temp > 60) {
                    d = temp / 60;
                    if (temp % 60 != 0) {
                        s = temp % 60;
                    }
                } else {
                    s = temp;
                }
            }
        } else {
            d = second / 60;
            if (second % 60 != 0) {
                s = second % 60;
            }
        }
        if (d == 0 && s < 10) return d + ":" + "0" + s;
        if (d == 0 && s > 10) return d + ":" + s;
        if (d < 10 && s < 10) return "0" + d + ":" + "0" + s;
        if (d < 10 && s > 10) return "0" + d + ":" + s;
        if (d > 10 && s > 10) return d + ":" + s;
        if (d > 10 && s < 10) return d + ":" + "0" + s;
        return d + ":" + s;
    }

    /**
     * 计算两个日期相差了几个月
     *
     * @param startDate
     * @param endDate
     * @return
     */
    public static int getMonthSub(String startDate, String endDate) {
        int count = 0;
        try {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
            Calendar bef = Calendar.getInstance();
            Calendar aft = Calendar.getInstance();
            bef.setTime(sdf.parse(startDate));
            aft.setTime(sdf.parse(endDate));
            int result = aft.get(Calendar.MONTH) - bef.get(Calendar.MONTH);
            int month = (aft.get(Calendar.YEAR) - bef.get(Calendar.YEAR)) * 12;
            count = Math.abs(month + result);
        } catch (java.text.ParseException e) {
            e.printStackTrace();
        }
        return count;
    }

    /**
     * 两个日期相减
     *
     * @param firstTime
     * @param secTime
     * @return 相减得到的秒数
     */
    public static long timeDaySub(String firstTime, String secTime) {
        long first = stringtoDate(firstTime, LONG_DATE_FORMAT).getTime();
        long second = stringtoDate(secTime, LONG_DATE_FORMAT).getTime();
        return (second - first) / 1000;
    }

    //当前时间是否在某一时间段内
    public static boolean isInPeriodOfTime(String beginTime, String endTime) {
        boolean isInTime = false;
        //获取当前系统时间
        Date currentTime = new Date();//currentTime就是系统当前时间
        Date strbeginDate = DateUtils.stringtoDate(beginTime, DateUtils.FORMAT_TWO);//起始时间
        Date strendDate = DateUtils.stringtoDate(endTime, DateUtils.FORMAT_TWO);//结束时间

        Calendar cal = Calendar.getInstance();
        if (strendDate != null) {
            cal.setTime(strendDate);
        }
        cal.add(Calendar.MINUTE, 20);
        strendDate = cal.getTime();

        if ((currentTime.getTime() - strbeginDate.getTime()) >= 0 && (strendDate.getTime() - currentTime.getTime()) >= 0) {//使用.getTime方法把时间转化成毫秒数,然后进行比较

            isInTime = true;
        } else {
            isInTime = false;
        }


        return isInTime;
    }

    /**
     * 种子时间是否在某一时间段内
     *
     * @param beginTime 区间开始时间
     * @param endTime   区间结束时间
     * @param seedDate  种子时间
     * @return
     */
    public static boolean isInPeriodOfIntervalTime(String beginTime, String endTime, String seedDate) {
        boolean isInTime = false;
        try {
            //种子时间
            Date currentTime = DateUtils.stringtoDate(seedDate, DateUtils.DATE_FORMAT_YEAR_MONTH_DAY_HOUR_MIN_SECOND);
            //起始时间
            Date strbeginDate = DateUtils.stringtoDate(beginTime, DateUtils.DATE_FORMAT_YEAR_MONTH_DAY_HOUR_MIN);
            //结束时间
            Date strendDate = DateUtils.stringtoDate(endTime, DateUtils.DATE_FORMAT_YEAR_MONTH_DAY_HOUR_MIN);
            Calendar cal = Calendar.getInstance();
            if (strendDate != null) {
                cal.setTime(strendDate);
            }
            cal.add(Calendar.MINUTE, 20);
            strendDate = cal.getTime();
            if ((currentTime.getTime() - strbeginDate.getTime()) >= 0 &&
                    (strendDate.getTime() - currentTime.getTime()) >= 0) {
                //使用.getTime方法把时间转化成毫秒数,然后进行比较
                isInTime = true;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return isInTime;
    }

    /**
     * 种子时间是否在某一时间段内
     *
     * @param beginTime 区间开始时间
     * @param endTime   区间结束时间
     * @param seedDate  种子时间
     * @return
     */
    public static boolean isInPeriodOfIntervalTime2(String beginTime, String endTime, String seedDate) {
        boolean isInTime = false;
        try {
            //种子时间
            Date currentTime = DateUtils.stringtoDate(seedDate, DateUtils.DATE_FORMAT_YEAR_MONTH_DAY_HOUR_MIN);
            //起始时间
            Date strbeginDate = DateUtils.stringtoDate(beginTime, DateUtils.DATE_FORMAT_YEAR_MONTH_DAY_HOUR_MIN);
            //结束时间
            Date strendDate = DateUtils.stringtoDate(endTime, DateUtils.DATE_FORMAT_YEAR_MONTH_DAY_HOUR_MIN);
            Calendar cal = Calendar.getInstance();
            if (strendDate != null) {
                cal.setTime(strendDate);
            }
            cal.add(Calendar.MINUTE, 20);
            strendDate = cal.getTime();
            if ((currentTime.getTime() - strbeginDate.getTime()) >= 0 &&
                    (strendDate.getTime() - currentTime.getTime()) >= 0) {
                //使用.getTime方法把时间转化成毫秒数,然后进行比较
                isInTime = true;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return isInTime;
    }

    /**
     * 当前时间属于本月第几周
     *
     * @param dateString
     * @return
     */
    public static int getWeekOfMonth(String dateString, String startDate) {
        int weekOfMonth = 0;
        try {
            SimpleDateFormat sdf = new SimpleDateFormat(LONG_DATE_FORMAT);
            Date date = sdf.parse(dateString);
            Calendar calendar = Calendar.getInstance();
            calendar.setTime(date);
            weekOfMonth = calendar.get(Calendar.WEEK_OF_MONTH);
            //获取当前时间为本周的第几天
            String[] mdate = startDate.split("-");
            if (mdate[2].equals("01")) {//本月第一天为周一
            } else {
                weekOfMonth = weekOfMonth - 1;
            }

        } catch (java.text.ParseException e) {
            e.printStackTrace();
            return weekOfMonth;
        }

        return weekOfMonth;
    }

    public static String dateToWeek(String datetime) {
        SimpleDateFormat f = new SimpleDateFormat("yyyy-MM-dd");
        String[] weekDays = {"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"};
        Calendar cal = Calendar.getInstance();
        Date date = null;
        try {
            try {
                date = f.parse(datetime);
            } catch (java.text.ParseException e) {
                e.printStackTrace();
            }
            cal.setTime(date);
        } catch (Exception e) {
            e.printStackTrace();
        }
        //一周的第几天
        int w = cal.get(Calendar.DAY_OF_WEEK) - 1;
        if (w < 0)
            w = 0;
        return weekDays[w];
    }
}
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R.layout.item_month

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:background="#ffffff"
    android:layout_height="50dp">

    <TextView
        android:id="@+id/tv_month"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:padding="5dp"
        android:text="8"
        android:textSize="15dp"
        android:textColor="#ff6600" />

</androidx.constraintlayout.widget.ConstraintLayout>
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R.layout.item_day

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="40dp"
    android:layout_marginTop="5dp"
    android:layout_marginBottom="5dp"
    android:background="#ffffff">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:orientation="vertical">

        <TextView
            android:id="@+id/tv_day"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:gravity="center"
            android:text="1"
            android:textSize="15dp" />

    </LinearLayout>

</RelativeLayout>
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OK！到这里就结束了 有什么问题可以发布评论一起探讨下