简单的日历实现,只是显示了每一个月,没有显示当天和记事这些功能
主要是计算月初是周几,月末是周几,然后相应的显示上一月多少天和下一月多少天。
先看一下关于日期的用到的几个工具类
/** * 获取该月天数 */ public static int getCurrentMonthDay(long millSec) { Calendar calendar = Calendar.getInstance(); calendar.setTimeInMillis(millSec); calendar.set(Calendar.DATE,1); calendar.roll(Calendar.DATE,-1); int dateCount = calendar.get(Calendar.DATE); return dateCount; } /** * 获取当月第一天 */ public static long getFirOfMonth(long millSec) { Calendar calendar = Calendar.getInstance(); calendar.setTimeInMillis(millSec); calendar.set(Calendar.DATE,1); return calendar.getTimeInMillis(); } /** * 获取当前时间戳 */ public static long getCurrentTime() { Calendar calendar = Calendar.getInstance(); return calendar.getTimeInMillis(); } /** * 获取上一月/下一月 */ public static long getLastOrNextMonth(long millSec,int count) { Calendar calendar = Calendar.getInstance(); calendar.setTimeInMillis(millSec); calendar.add(Calendar.MONTH,count); return calendar.getTimeInMillis(); } /** * 格式化到月份 */ public static String long2str(long millSec) { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM"); return sdf.format(new Date(millSec)); }
用一个List存放每一天,因为之前考虑到每一天有记事这些,所以封装了一个类,如果不需要的话可以直接一个时间戳就可以。
打开之后先获取当前的时间戳,然后初始化到当前月份的第一天,通过工具类中方法。
然后就是计算了,把上月结余的、本月所有、下月的一起添加到List中。
private voID setCalendarList(long millSecs) { beans.clear(); Calendar calendar = Calendar.getInstance(); calendar.setTimeInMillis(millSecs);// int nor = today.getDay(); int max = DateUtil.getCurrentMonthDay(millSecs); /** * 当月日历 */ for (int i = 1; i <= max; i++) { DayBean bean = new DayBean(); Calendar cc = Calendar.getInstance(); cc.setTimeInMillis(millSecs); cc.add(Calendar.DAY_OF_MONTH,i - 1); setBean(bean,cc); bean.setIsCurrentMonth(true); beans.add(bean); } //上月结余 int fir_day_of_week = beans.get(0).getCalendar().get(Calendar.DAY_OF_WEEK); Log.e("AAA","week_last:" + fir_day_of_week); if (fir_day_of_week != 2) { if(fir_day_of_week == 1){ for (int i = 0; i < 6; i++) { DayBean bean = new DayBean(); Calendar cc = Calendar.getInstance(); cc.setTimeInMillis(millSecs); cc.add(Calendar.DAY_OF_MONTH,-i -1); setBean(bean,cc); Log.e("AAA","last:" + bean.getDay()); bean.setIsCurrentMonth(false); beans.add(0,bean); } }else{ for (int i = 0; i < fir_day_of_week-2; i++) { DayBean bean = new DayBean(); Calendar cc = Calendar.getInstance(); cc.setTimeInMillis(millSecs); cc.add(Calendar.DAY_OF_MONTH,-i-1); setBean(bean,bean); } } } //下月 int last_day_of_week = beans.get(beans.size() - 1).getCalendar().get(Calendar.DAY_OF_WEEK); Log.e("AAA","week_next:" + last_day_of_week); if (last_day_of_week != 1) { for (int i = last_day_of_week; i < 8; i++) { DayBean bean = new DayBean(); Calendar cc = Calendar.getInstance(); cc.setTimeInMillis(millSecs); cc.add(Calendar.DAY_OF_MONTH,i - last_day_of_week); setBean(bean,cc); Log.e("AAA","next:" + bean.getDay()); bean.setIsCurrentMonth(false); beans.add(bean); } } GrIDVIEwAdapter adapter = new GrIDVIEwAdapter(this,beans); mGrIDVIEw.setAdapter(adapter); } private voID setBean(DayBean bean,Calendar cc) { bean.setCalendar(cc); bean.setDay(cc.get(Calendar.DAY_OF_MONTH)); }
设置每一天时设置了一个字段为是否为本月,如果是,则设置为黑色,否则设为灰色显示,在Adapter中的getVIEw方法中设置即可。
@OverrIDe public VIEw getVIEw(int position,VIEw convertVIEw,VIEwGroup parent) { VIEwHolder holder; if (convertVIEw == null) { convertVIEw = inflater.inflate(R.layout.item_layout,null); holder = new VIEwHolder(); holder.day_text = (TextVIEw) convertVIEw.findVIEwByID(R.ID.day_text); convertVIEw.setTag(holder); } else { holder = (VIEwHolder) convertVIEw.getTag(); } holder.day_text.setText(beans.get(position).getDay() + ""); if (beans.get(position).isToday()) { holder.day_text.setBackgroundcolor(color.RED); } else { holder.day_text.setBackgroundcolor(color.WHITE); } if (beans.get(position).isCurrentMonth()) { holder.day_text.setTextcolor(color.BLACK); } else { holder.day_text.setTextcolor(color.GRAY); } return convertVIEw; } class VIEwHolder { TextVIEw day_text; }
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