Android 自定义实现日历
开发工具AndroidStudio,使用组件GridView实现步骤以及原理具体实现开发工具AndroidStudio,使用组件GridView
实现步骤以及原理
通过Calendar获取当前年月日获取指定年月的天数得到当月一号是星期几获取日期对象的列表数据:当月天数加上当月1号星期几之前的空白数据(比如1号是星期3,那么日期列表数据之前添加三个数据)设置GridView的适配器具体实现
用Calendar对象获取日期Calendar calendar = Calendar.getInstance(); currYear = calendar.get(Calendar.YEAR); currMouth = calendar.get(Calendar.MONTH);
获取对应年月的天数
private int getMonthLastDay(int year, int month) {Calendar a = Calendar.getInstance();a.set(Calendar.YEAR, year);a.set(Calendar.MONTH, month - 1);a.set(Calendar.DATE, 1);//把日期设置为当月第一天a.roll(Calendar.DATE, -1);//日期回滚一天,也就是最后一天return a.get(Calendar.DATE);}
一号是星期几
Calendar calendar = Calendar.getInstance();int currYear = calendar.get(Calendar.YEAR);int currMouth = calendar.get(Calendar.MONTH) + 1;int currDay = calendar.get(Calendar.DAY_OF_MONTH);calendar.set(year, mouth - 1, 0);int i1 = calendar.get(Calendar.DAY_OF_WEEK);//这就是星期几
得到日期数据列表
public void requestData() {last_state = 0;state_count = 0;ArrayList<DateInfo> datas = new ArrayList<>();Calendar calendar = Calendar.getInstance();int currYear = calendar.get(Calendar.YEAR);int currMouth = calendar.get(Calendar.MONTH) + 1;int currDay = calendar.get(Calendar.DAY_OF_MONTH);calendar.set(year, mouth - 1, 0);int i1 = calendar.get(Calendar.DAY_OF_WEEK);if (i1 > 6)//如果大于6天,也就是一个星期的天数,就不用添加,否则显示一行空白i1 = 0;for (int i = 0; i < i1; i++) {datas.add(new DateInfo(true));}for (int i = 0; i < getMonthLastDay(year, mouth); i++) {DateInfo data = new DateInfo(year, mouth, i + 1);if (currYear == year && currMouth == mouth && currDay == i + 1)data.setToday(true);data.setState(new Random().nextInt(4));//设置这一天的状态的if (last_state == 0) {last_state = data.getState();state_count = 1;} else if (last_state == data.getState()) {++state_count;datas.get(i + i1 - 1).setState_count(state_count);data.setState_count(state_count);} else {last_state = data.getState();state_count = 1;}datas.add(data);}}
最后继承自BaseAdapter,设置GridView的适配器
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