Android使用GridView实现日历的简单功能

2019-12-12 04:21:17

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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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