Android使用GridView实现日历的简单功能

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, 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));

}

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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