簡單的日歷實現，只是顯示了每一個月，沒有顯示當天和記事這些功能
主要是計算月初是周幾，月末是周幾，然后相應的顯示上一月多少天和下一月多少天。
先看一下關于日期的用到的幾個工具類
/** * 獲取該月天數 */ 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; } /** * 獲取當月第一天 */ public static long getFirOfMonth(long millSec) { Calendar calendar = Calendar.getInstance(); calendar.setTimeInMillis(millSec); calendar.set(Calendar.DATE, 1); return calendar.getTimeInMillis(); } /** * 獲取當前時間戳 */ public static long getCurrentTime() { Calendar calendar = Calendar.getInstance(); return calendar.getTimeInMillis(); } /** * 獲取上一月/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)); }用一個List存放每一天，因為之前考慮到每一天有記事這些，所以封裝了一個類，如果不需要的話可以直接一個時間戳就可以。
打開之后先獲取當前的時間戳，然后初始化到當前月份的第一天，通過工具類中方法。
然后就是計算了，把上月結余的、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); /** * 當月日歷 */ 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); } //上月結余 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, cc); Log.e("AAA", "last:" + bean.getDay()); bean.setIsCurrentMonth(false); beans.add(0, 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)); }設置每一天時設置了一個字段為是否為本月，如果是，則設置為黑色，否則設為灰色顯示，在Adapter中的getView方法中設置即可。
@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; }以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持武林網。
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