前几天闲来无事，变想做一些小工具玩玩。花了一天多的时间，，弄出一个简单日历的View。分为月份模式和星期模式。滚动查看，先上图看看：
上面的是显示的是月份的模式。下面是星期的模式：
CalendarView是一个自定义View,然后通过Viewpager的OnpageChangeListener进行刷新View的数据。Viewpager通过轮回使用View。我默认设置是5个。可以左右无限切换。后面因为我在ViewPager下面加了一个slidingDrawer。打开抽屉就可以直接切换成week的模式。为了使Adapter和OnPageChangeListener两个类可以和CalendarView减少耦合，我增加了一个CalendarViewBuilder类。
CalendarView：
package com.example.calendar.widget;import com.example.caledar.util.DateUtil;import com.example.calendar.doim.CustomDate;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.util.AttributeSet;import android.util.Log;import android.view.MotionEvent;import android.view.View;import android.view.ViewConfiguration;public class CalendarView extends View {private static final String TAG = "CalendarView";/** * 两种模式 （月份和星期） */public static final int MONTH_STYLE = 0;public static final int WEEK_STYLE = 1;private static final int TOTAL_COL = 7;private static final int TOTAL_ROW = 6;private Paint mCirclePaint;private Paint mTextPaint;private int mViewWidth;private int mViewHight;private int mCellSpace;private Row rows[] = new Row[TOTAL_ROW];private static CustomDate mShowDate;//自定义的日期 包括year month daypublic static int style = MONTH_STYLE;private static final int WEEK = 7;private CallBack mCallBack;//回调private int touchSlop;private boolean callBackCellSpace;public interface CallBack {void clickDate(CustomDate date);//回调点击的日期void onMesureCellHeight(int cellSpace);//回调cell的高度确定slidingDrawer高度void changeDate(CustomDate date);//回调滑动viewPager改变的日期}public CalendarView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);init(context);}public CalendarView(Context context, AttributeSet attrs) {super(context, attrs);init(context);}public CalendarView(Context context) {super(context);init(context);}public CalendarView(Context context, int style, CallBack mCallBack) {super(context);CalendarView.style = style;this.mCallBack = mCallBack;init(context);}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);for (int i = 0; i < TOTAL_ROW; i++) {if (rows[i] != null)rows[i].drawCells(canvas);}}private void init(Context context) {mTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);mCirclePaint = new Paint(Paint.ANTI_ALIAS_FLAG);mCirclePaint.setStyle(Paint.Style.FILL);mCirclePaint.setColor(Color.parseColor("#F24949"));touchSlop = ViewConfiguration.get(context).getScaledTouchSlop();initDate();}private void initDate() {if (style == MONTH_STYLE) {mShowDate = new CustomDate();} else if(style == WEEK_STYLE ) {mShowDate = DateUtil.getNextSunday();}fillDate();}@Overrideprotected void onSizeChanged(int w, int h, int oldw, int oldh) {super.onSizeChanged(w, h, oldw, oldh);mViewWidth = w;mViewHight = h;mCellSpace = Math.min(mViewHight / TOTAL_ROW, mViewWidth / TOTAL_COL);if (!callBackCellSpace) {mCallBack.onMesureCellHeight(mCellSpace);callBackCellSpace = true;}mTextPaint.setTextSize(mCellSpace / 3);}private Cell mClickCell;private float mDownX;private float mDownY;/* * * 触摸事件为了确定点击的位置日期 */@Overridepublic boolean onTouchEvent(MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:mDownX = event.getX();mDownY = event.getY();break;case MotionEvent.ACTION_UP:float disX = event.getX() – mDownX;float disY = event.getY() – mDownY;if (Math.abs(disX) < touchSlop && Math.abs(disY) < touchSlop) {int col = (int) (mDownX / mCellSpace);int row = (int) (mDownY / mCellSpace);measureClickCell(col, row);}break;}return true;}private void measureClickCell(int col, int row) {if (col >= TOTAL_COL || row >= TOTAL_ROW)return;if (mClickCell != null) {rows[mClickCell.j].cells[mClickCell.i] = mClickCell;}if (rows[row] != null) {mClickCell = new Cell(rows[row].cells[col].date,rows[row].cells[col].state, rows[row].cells[col].i,rows[row].cells[col].j);rows[row].cells[col].state = State.CLICK_DAY;CustomDate date = rows[row].cells[col].date;date.week = col;mCallBack.clickDate(date);invalidate();}}// 组class Row {public int j;Row(int j) {this.j = j;}public Cell[] cells = new Cell[TOTAL_COL];public void drawCells(Canvas canvas) {for (int i = 0; i < cells.length; i++) {if (cells[i] != null)cells[i].drawSelf(canvas);}}}// 单元格class Cell {public CustomDate date;public State state;public int i;public int j;public Cell(CustomDate date, State state, int i, int j) {super();this.date = date;this.state = state;this.i = i;this.j = j;}// 绘制一个单元格 如果颜色需要自定义可以修改public void drawSelf(Canvas canvas) {switch (state) {case CURRENT_MONTH_DAY:mTextPaint.setColor(Color.parseColor("#80000000"));break;case NEXT_MONTH_DAY:case PAST_MONTH_DAY:mTextPaint.setColor(Color.parseColor("#40000000"));break;case TODAY:mTextPaint.setColor(Color.parseColor("#F24949"));break;case CLICK_DAY:mTextPaint.setColor(Color.parseColor("#fffffe"));canvas.drawCircle((float) (mCellSpace * (i + 0.5)),(float) ((j + 0.5) * mCellSpace), mCellSpace / 2,mCirclePaint);break;}// 绘制文字String content = date.day+"";canvas.drawText(content,(float) ((i+0.5) * mCellSpace – mTextPaint.measureText(content)/2),(float) ((j + 0.7) * mCellSpace – mTextPaint.measureText(content, 0, 1) / 2), mTextPaint);}}/** * * @author huang * cell的state *当前月日期，过去的月的日期，下个月的日期，今天，点击的日期 * */enum State {CURRENT_MONTH_DAY, PAST_MONTH_DAY, NEXT_MONTH_DAY, TODAY, CLICK_DAY;}/** * 填充日期的数据 */private void fillDate() {if (style == MONTH_STYLE) {fillMonthDate();} else if(style == WEEK_STYLE) {fillWeekDate();}mCallBack.changeDate(mShowDate);}/** * 填充星期模式下的数据 默认通过当前日期得到所在星期天的日期，然后依次填充日期 */private void fillWeekDate() {int lastMonthDays = DateUtil.getMonthDays(mShowDate.year, mShowDate.month-1);rows[0] = new Row(0);int day = mShowDate.day;for (int i = TOTAL_COL -1; i >= 0 ; i–) {day -= 1;if (day < 1) {day = lastMonthDays;}CustomDate date = CustomDate.modifiDayForObject(mShowDate, day);if (DateUtil.isToday(date)) {mClickCell = new Cell(date, State.TODAY, i, 0);date.week = i;mCallBack.clickDate(date);rows[0].cells[i] = new Cell(date, State.CLICK_DAY, i, 0);continue;}rows[0].cells[i] = new Cell(date, State.CURRENT_MONTH_DAY,i, 0);}}/** * 填充月份模式下数据 通过getWeekDayFromDate得到一个月第一天是星期几就可以算出所有的日期的位置 然后依次填充 * 这里最好重构一下 */private void fillMonthDate() {int monthDay = DateUtil.getCurrentMonthDay();int lastMonthDays = DateUtil.getMonthDays(mShowDate.year, mShowDate.month – 1);int currentMonthDays = DateUtil.getMonthDays(mShowDate.year, mShowDate.month);int firstDayWeek = DateUtil.getWeekDayFromDate(mShowDate.year, mShowDate.month);boolean isCurrentMonth = false;if (DateUtil.isCurrentMonth(mShowDate)) {isCurrentMonth = true;}int day = 0;for (int j = 0; j < TOTAL_ROW; j++) {rows[j] = new Row(j);for (int i = 0; i < TOTAL_COL; i++) {int postion = i + j * TOTAL_COL;if (postion >= firstDayWeek&& postion < firstDayWeek + currentMonthDays) {day++;if (isCurrentMonth && day == monthDay) {CustomDate date = CustomDate.modifiDayForObject(mShowDate, day);mClickCell = new Cell(date,State.TODAY, i,j);date.week = i;mCallBack.clickDate(date);rows[j].cells[i] = new Cell(date,State.CLICK_DAY, i,j);continue;}rows[j].cells[i] = new Cell(CustomDate.modifiDayForObject(mShowDate, day),State.CURRENT_MONTH_DAY, i, j);} else if (postion < firstDayWeek) {rows[j].cells[i] = new Cell(new CustomDate(mShowDate.year, mShowDate.month-1, lastMonthDays – (firstDayWeek- postion – 1)), State.PAST_MONTH_DAY, i, j);} else if (postion >= firstDayWeek + currentMonthDays) {rows[j].cells[i] = new Cell((new CustomDate(mShowDate.year, mShowDate.month+1, postion – firstDayWeek – currentMonthDays + 1)), State.NEXT_MONTH_DAY, i, j);}}}}public void update() {fillDate();invalidate();}public void backToday(){initDate();invalidate();}//切换stylepublic void switchStyle(int style) {CalendarView.style = style;if (style == MONTH_STYLE) {update();} else if (style == WEEK_STYLE) {int firstDayWeek = DateUtil.getWeekDayFromDate(mShowDate.year,mShowDate.month);int day = 1 + WEEK – firstDayWeek;mShowDate.day = day;update();}}//向右滑动public void rightSilde() {if (style == MONTH_STYLE) {if (mShowDate.month == 12) {mShowDate.month = 1;mShowDate.year += 1;} else {mShowDate.month += 1;}} else if (style == WEEK_STYLE) {int currentMonthDays = DateUtil.getMonthDays(mShowDate.year, mShowDate.month);if (mShowDate.day + WEEK > currentMonthDays) {if (mShowDate.month == 12) {mShowDate.month = 1;mShowDate.year += 1;} else {mShowDate.month += 1;}mShowDate.day = WEEK – currentMonthDays + mShowDate.day;}else{mShowDate.day += WEEK;}}update();}//向左滑动public void leftSilde() {if (style == MONTH_STYLE) {if (mShowDate.month == 1) {mShowDate.month = 12;mShowDate.year -= 1;} else {mShowDate.month -= 1;}} else if (style == WEEK_STYLE) {int lastMonthDays = DateUtil.getMonthDays(mShowDate.year, mShowDate.month);if (mShowDate.day – WEEK < 1) {if (mShowDate.month == 1) {mShowDate.month = 12;mShowDate.year -= 1;} else {mShowDate.month -= 1;}mShowDate.day = lastMonthDays – WEEK + mShowDate.day;}else{mShowDate.day -= WEEK;}Log.i(TAG, "leftSilde"+mShowDate.toString());}update();}}只要心中有希望存在，就有幸福存在。
