Android 使用RecycleView打造自定义日历

1 大致思路
1) 初始化日历数据，作为list传入到RecyclerView.Adapter
2) 重写RecyclerView的onTouchEvent方法，监听手势的改变，然后更改list数据，重新显示UI

上个效果图

2 关键代码

那么整个项目的重点在于如何获取到正确的日期数据，这个在网上找了一个CalendarTool经过测试确实还不错，省去很多工夫，稍作修改就直接拿来用了。

public class CalendarTool<T extends BaseDateEntity> {private final String TAG = CalendarTool.class.getSimpleName();public static int FLING_MIN_DISTANCE = 100;private final int[] weekDayRow = {0, 1, 2, 3, 4, 5, 6};private ArrayList<DateEntity> mDataList = new ArrayList<>();//日期数组private ArrayList<T> mRecordList;//事件记录数组private DateEntity   mDateEntity;private int          mYear;private int          mMonth;private boolean mEndBelong;private boolean mStartBelong;private int     mStartDay;private int     mEndDay;/*** 当前年月日*/private int mCurrenYear;private int mCurrenMonth;private int mCurrenDay;/*** 平年月天数数组*/int commonYearMonthDay[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};/*** 闰年月天数数组*/int leapYearMonthDay[]   = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};public CalendarTool() {/** 初始化当前系统的日期 */Calendar calendar = Calendar.getInstance();mCurrenYear = calendar.get(Calendar.YEAR);mCurrenMonth = calendar.get(Calendar.MONTH) + 1;mCurrenDay = calendar.get(Calendar.DAY_OF_MONTH);this.mYear = mCurrenYear;this.mMonth = mCurrenMonth;}/*** 获取当前日历的年月 x为年，y为月*/public Point getNowCalendar() {Point p = new Point(mYear, mMonth);return p;}/*** 判断第一天属不属于本月*/public boolean isStartBelong() {return mStartBelong;}/*** 判断最后一天属不属于本月*/public boolean isEndBelong() {return mEndBelong;}/*** 获取日历第一天的日期*/public int getStartDay() {return mStartDay;}/*** 获取日历最后一天的日期*/public int getEndDay() {return mEndDay;}public ArrayList<DateEntity> initDateList() {return initDateList(mYear, mMonth);}public void initRecordList(ArrayList<T> recordList) {mRecordList = recordList;}/*** 通过年月获取当前页面的日期集合*/private ArrayList<DateEntity> initDateList(int year, int month) {Log.i(TAG, "initDateList: year = " + year + " month = " + month);mDataList.clear();/** 修改部分 */int endDate = 0;// 得到上一个月的天数，作为上一个月在本日历的结束日期if ((year - 1) == this.mYear || month == 1) {// 说明向前翻了一年，那么上个月的天数就应该是上一年的12月的天数，或者到翻到一月份的时候，那么上一个月的天数也是上一年的12月份的天数endDate = this.getDays(year - 1, 12);} else {// 得到上一个月的天数，作为上一个月在本日历的结束日期endDate = this.getDays(year, month - 1);}/** 修改部分结束 */this.mYear = year;// 当前日历上显示的年this.mMonth = month;// 当前日历上显示的月int days = this.getDays(year, month);// 得到本月的总共天数int dayOfWeek = this.getWeekDay(year, month);//得到当前年月的第一天为星期几int selfDaysEndWeek = 0;// 本月的最后一天是星期几mStartBelong = true;/** 先添加前面不属于本月的 */if (dayOfWeek != 0) {int startDate = endDate - dayOfWeek + 1;// 当前月的上一个月在本日历的开始日期for (int i = startDate, j = 0; i <= endDate; i++, j++) {mDateEntity = new DateEntity(year, month - 1, i);mDateEntity.date = mDateEntity.year * 10000 + mDateEntity.month * 100 + i;if (startDate == i) {mStartBelong = false;mStartDay = mDateEntity.date;}mDateEntity.isSelfMonthDate = false;mDateEntity.weekDay = weekDayRow[j];mDateEntity.hasRecord = hasRecord(mDateEntity.date);mDataList.add(mDateEntity);}}/** 添加本月的 */for (int i = 1, j = dayOfWeek; i <= days; i++, j++) {mDateEntity = new DateEntity(year, month, i);mDateEntity.date = mDateEntity.year * 10000 + mDateEntity.month * 100 + i;if (mStartBelong && i == 1) {mStartDay = mDateEntity.date;}if (i == days) {mEndDay = mDateEntity.date;}mDateEntity.isSelfMonthDate = true;if (j >= 7) {j = 0;}selfDaysEndWeek = j;mDateEntity.weekDay = weekDayRow[j];if (year == mCurrenYear && month == mCurrenMonth && i == mCurrenDay) {mDateEntity.isNowDate = true;}mDateEntity.hasRecord = hasRecord(mDateEntity.date);mDataList.add(mDateEntity);}mEndBelong = true;/*** 添加后面下一个月的 */for (int i = 1, j = selfDaysEndWeek + 1; i < 7; i++, j++) {if (j >= 7) {break;}mEndBelong = false;mDateEntity = new DateEntity(year, month + 1, i);if (mDateEntity.month > 12) {mDateEntity.year = year + 1;mDateEntity.month = 1;}mDateEntity.date = mDateEntity.year * 10000 + mDateEntity.month * 100 + i;mDateEntity.isSelfMonthDate = false;mDateEntity.weekDay = weekDayRow[j];mDateEntity.hasRecord = hasRecord(mDateEntity.date);mDataList.add(mDateEntity);mEndDay = mDateEntity.year * 10000 + mDateEntity.month * 100 + i;}return mDataList;}/*** 通过年月，获取这个月一共有多少天*/private int getDays(int year, int month) {int days = 0;if ((year % 4 == 0 && (year % 100 != 0)) || (year % 400 == 0)) {if (month > 0 && month <= 12) {days = leapYearMonthDay[month - 1];}} else {if (month > 0 && month <= 12) {days = commonYearMonthDay[month - 1];}}return days;}private boolean hasRecord(int date) {if (mRecordList != null) {for (T baseDateEntity : mRecordList) {if (baseDateEntity.year * 10000 + baseDateEntity.month * 100 + baseDateEntity.day == date) {return true;}}}return false;}/*** 通过年，月获取当前月的第一天为星期几 ，返回0是星期天，1是星期一，依次类推*/private int getWeekDay(int year, int month) {int dayOfWeek;int goneYearDays = 0;int thisYearDays = 0;boolean isLeapYear = false;//闰年int commonYearMonthDay[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};int leapYearMonthDay[] = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};for (int i = 1900; i < year; i++) {// 从1900年开始算起，1900年1月1日为星期一if ((i % 4 == 0 && (i % 100 != 0)) || (i % 400 == 0)) {goneYearDays = goneYearDays + 366;} else {goneYearDays = goneYearDays + 365;}}if ((year % 4 == 0 && (year % 100 != 0)) || (year % 400 == 0)) {isLeapYear = true;for (int i = 0; i < month - 1; i++) {thisYearDays = thisYearDays + leapYearMonthDay[i];}} else {isLeapYear = false;for (int i = 0; i < month - 1; i++) {thisYearDays = thisYearDays + commonYearMonthDay[i];}}dayOfWeek = (goneYearDays + thisYearDays + 1) % 7;Log.d(this.getClass().getName(), "从1990到现在有" + (goneYearDays + thisYearDays + 1) + "天");Log.d(this.getClass().getName(), year + "年" + month + "月" + 1 + "日是星期" + dayOfWeek);return dayOfWeek;}public void flushDate(float distance_x) {if (distance_x < 0) {// Fling rightif (mMonth + 1 > 12) {mDataList = initDateList(mYear + 1, 1);} else {mDataList = initDateList(mYear, mMonth + 1);}} else {// Fling leftif (mMonth - 1 <= 0) {mDataList = initDateList(mYear - 1, 12);} else {mDataList = initDateList(mYear, mMonth - 1);}}}
}

关键部分在于initDateList方法，会根据当前传入的年月数据来计算当前日历该显示的数据，包括显示前一个月的日期以及后一个月的日期。那么APP要做的就只是不断的传入年月信息，重新去计算日历数据
。这里重写了RecyclerView方法的onTouchEvent来判断用户的触摸方向，后来因为要实现每一个日历的点击事件，与监听的滑动事件冲突了，
所以也重写了onInterceptTouchEvent方法来拦截子控件的点击事件。

public class CalendarRecycleView<T extends BaseDateEntity> extends RecyclerView {private CalendarRecycleViewAdapter mAdapter;private Context                    mContext;private CalendarTool               mCalendarTool;private OnCalendarDateListener     mDateListener;private float                      motion_x;public CalendarRecycleView(Context context) {super(context);mContext = context;init();}public CalendarRecycleView(Context context, AttributeSet attrs) {super(context, attrs);mContext = context;init();}public CalendarRecycleView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);mContext = context;init();}private void init() {setLayoutManager(new StaggeredGridLayoutManager(7, StaggeredGridLayoutManager.VERTICAL));mCalendarTool = new CalendarTool();mAdapter = new CalendarRecycleViewAdapter(mContext, mCalendarTool.initDateList());setAdapter(mAdapter);mAdapter.setOnItemListener(new CalendarRecycleViewAdapter.OnItemListener() {@Overridepublic void onItemClick(DateEntity dateEntity) {if (mDateListener != null) {mDateListener.onDateItemClick(dateEntity);}}});}public void initRecordList(ArrayList<T> list) {mCalendarTool.initRecordList(list);mCalendarTool.initDateList();mAdapter.notifyDataSetChanged();}public void setOnCalendarDateListener(OnCalendarDateListener listener) {this.mDateListener = listener;}@Overridepublic boolean onTouchEvent(MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:motion_x = event.getX();Log.i("onTouchEvent", "ACTION_DOWN: " + event.getX() + "  " + motion_x);break;case MotionEvent.ACTION_MOVE:Log.i("onTouchEvent", "ACTION_MOVE: " + event.getX() + "  " + motion_x);float x = event.getX() - motion_x;if (Math.abs(x) > CalendarTool.FLING_MIN_DISTANCE && motion_x != 0) {mCalendarTool.flushDate(x);mAdapter.notifyDataSetChanged();motion_x = 0;if (mDateListener != null) {mDateListener.onDateChange(mCalendarTool.getNowCalendar(),mCalendarTool.getStartDay(),mCalendarTool.getEndDay(),mCalendarTool.isStartBelong(),mCalendarTool.isEndBelong());}return true;}break;case MotionEvent.ACTION_UP:break;}return super.onTouchEvent(event);}@Overridepublic boolean onInterceptTouchEvent(MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:motion_x = event.getX();break;case MotionEvent.ACTION_MOVE:if (Math.abs(motion_x - event.getX()) >= mCalendarTool.FLING_MIN_DISTANCE) {return true;}break;case MotionEvent.ACTION_UP:break;}return super.onInterceptTouchEvent(event);}
}

3 结论
实现起来很简单，就是细节方面要多注意，然后因为没有用到ViewPager，所以滑动起来没有动画效果，加上去也简单，关键是要把ViewPager fragment的list数据计算好就成。
下载：

http://download.csdn.net/detail/u012521570/9879095

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