Android 自定义日历控件

/**
* 日历控件 功能：获得点选的日期区间
*
*/
public class CalendarView extends View implements View.OnTouchListener {
private final static String TAG = "anCalendar";
private Date selectedStartDate;
private Date selectedEndDate;
private Date curDate; // 当前日历显示的月
private Date today; // 今天的日期文字显示红色
private Date downDate; // 手指按下状态时临时日期
private Date showFirstDate, showLastDate; // 日历显示的第一个日期和最后一个日期
private int downIndex; // 按下的格子索引
private Calendar calendar;
private Surface surface;
private int[] date = new int[42]; // 日历显示数字
private int curStartIndex, curEndIndex; // 当前显示的日历起始的索引
//private boolean completed = false; // 为false表示只选择了开始日期，true表示结束日期也选择了
//给控件设置监听事件
private OnItemClickListener onItemClickListener;

public CalendarView(Context context) {
super(context);
init();
}

public CalendarView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}

private void init() {
curDate = selectedStartDate = selectedEndDate = today = new Date();
calendar = Calendar.getInstance();
calendar.setTime(curDate);
surface = new Surface();
surface.density = getResources().getDisplayMetrics().density;
setBackgroundColor(surface.bgColor);
setOnTouchListener(this);
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
surface.width = getResources().getDisplayMetrics().widthPixels;
surface.height = (int) (getResources().getDisplayMetrics().heightPixels*2/5);
//      if (View.MeasureSpec.getMode(widthMeasureSpec) == View.MeasureSpec.EXACTLY) {
//          surface.width = View.MeasureSpec.getSize(widthMeasureSpec);
//      }
//      if (View.MeasureSpec.getMode(heightMeasureSpec) == View.MeasureSpec.EXACTLY) {
//          surface.height = View.MeasureSpec.getSize(heightMeasureSpec);
//      }
widthMeasureSpec = View.MeasureSpec.makeMeasureSpec(surface.width,
View.MeasureSpec.EXACTLY);
heightMeasureSpec = View.MeasureSpec.makeMeasureSpec(surface.height,
View.MeasureSpec.EXACTLY);
setMeasuredDimension(widthMeasureSpec, heightMeasureSpec);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}

@Override
protected void onLayout(boolean changed, int left, int top, int right,
int bottom) {
Log.d(TAG, "[onLayout] changed:"
+ (changed ? "new size" : "not change") + " left:" + left
+ " top:" + top + " right:" + right + " bottom:" + bottom);
if (changed) {
surface.init();
}
super.onLayout(changed, left, top, right, bottom);
}

@Override
protected void onDraw(Canvas canvas) {
Log.d(TAG, "onDraw");
// 画框
canvas.drawPath(surface.boxPath, surface.borderPaint);
// 年月
//String monthText = getYearAndmonth();
//float textWidth = surface.monthPaint.measureText(monthText);
//canvas.drawText(monthText, (surface.width - textWidth) / 2f,
//      surface.monthHeight * 3 / 4f, surface.monthPaint);
// 上一月/下一月
//canvas.drawPath(surface.preMonthBtnPath, surface.monthChangeBtnPaint);
//canvas.drawPath(surface.nextMonthBtnPath, surface.monthChangeBtnPaint);
// 星期
float weekTextY = surface.monthHeight + surface.weekHeight * 3 / 4f;
// 星期背景
//      surface.cellBgPaint.setColor(surface.textColor);
//      canvas.drawRect(surface.weekHeight, surface.width, surface.weekHeight, surface.width, surface.cellBgPaint);
for (int i = 0; i < surface.weekText.length; i++) {
float weekTextX = i
* surface.cellWidth
+ (surface.cellWidth - surface.weekPaint
.measureText(surface.weekText[i])) / 2f;
canvas.drawText(surface.weekText[i], weekTextX, weekTextY,
surface.weekPaint);
}

// 计算日期
calculateDate();
// 按下状态，选择状态背景色
drawDownOrSelectedBg(canvas);
// write date number
// today index
int todayIndex = -1;
calendar.setTime(curDate);
String curYearAndMonth = calendar.get(Calendar.YEAR) + ""
+ calendar.get(Calendar.MONTH);
calendar.setTime(today);
String todayYearAndMonth = calendar.get(Calendar.YEAR) + ""
+ calendar.get(Calendar.MONTH);
if (curYearAndMonth.equals(todayYearAndMonth)) {
int todayNumber = calendar.get(Calendar.DAY_OF_MONTH);
todayIndex = curStartIndex + todayNumber - 1;
}
for (int i = 0; i < 42; i++) {
int color = surface.textColor;
if (isLastMonth(i)) {
color = surface.borderColor;
} else if (isNextMonth(i)) {
color = surface.borderColor;
}
if (todayIndex != -1 && i == todayIndex) {
color = surface.todayNumberColor;
}
drawCellText(canvas, i, date[i] + "", color);
}
super.onDraw(canvas);
}

private void calculateDate() {
calendar.setTime(curDate);
calendar.set(Calendar.DAY_OF_MONTH, 1);
int dayInWeek = calendar.get(Calendar.DAY_OF_WEEK);
Log.d(TAG, "day in week:" + dayInWeek);
int monthStart = dayInWeek;
if (monthStart == 1) {
monthStart = 8;
}
monthStart -= 1;  //以日为开头-1，以星期一为开头-2
curStartIndex = monthStart;
date[monthStart] = 1;
// last month
if (monthStart > 0) {
calendar.set(Calendar.DAY_OF_MONTH, 0);
int dayInmonth = calendar.get(Calendar.DAY_OF_MONTH);
for (int i = monthStart - 1; i >= 0; i--) {
date[i] = dayInmonth;
dayInmonth--;
}
calendar.set(Calendar.DAY_OF_MONTH, date[0]);
}
showFirstDate = calendar.getTime();
// this month
calendar.setTime(curDate);
calendar.add(Calendar.MONTH, 1);
calendar.set(Calendar.DAY_OF_MONTH, 0);
// Log.d(TAG, "m:" + calendar.get(Calendar.MONTH) + " d:" +
// calendar.get(Calendar.DAY_OF_MONTH));
int monthDay = calendar.get(Calendar.DAY_OF_MONTH);
for (int i = 1; i < monthDay; i++) {
date[monthStart + i] = i + 1;
}
curEndIndex = monthStart + monthDay;
// next month
for (int i = monthStart + monthDay; i < 42; i++) {
date[i] = i - (monthStart + monthDay) + 1;
}
if (curEndIndex < 42) {
// 显示了下一月的
calendar.add(Calendar.DAY_OF_MONTH, 1);
}
calendar.set(Calendar.DAY_OF_MONTH, date[41]);
showLastDate = calendar.getTime();
}

/**
*
* @param canvas
* @param index
* @param text
*/
private void drawCellText(Canvas canvas, int index, String text, int color) {
int x = getXByIndex(index);
int y = getYByIndex(index);
surface.datePaint.setColor(color);
float cellY = surface.monthHeight + surface.weekHeight + (y - 1)
* surface.cellHeight + surface.cellHeight * 3 / 4f;
float cellX = (surface.cellWidth * (x - 1))
+ (surface.cellWidth - surface.datePaint.measureText(text))
/ 2f;
canvas.drawText(text, cellX, cellY, surface.datePaint);
}

/**
*
* @param canvas
* @param index
* @param color
*/
private void drawCellBg(Canvas canvas, int index, int color) {
int x = getXByIndex(index);
int y = getYByIndex(index);
surface.cellBgPaint.setColor(color);
float left = surface.cellWidth * (x - 1) + surface.borderWidth;
float top = surface.monthHeight + surface.weekHeight + (y - 1)
* surface.cellHeight + surface.borderWidth;
canvas.drawRect(left, top, left + surface.cellWidth
- surface.borderWidth, top + surface.cellHeight
- surface.borderWidth, surface.cellBgPaint);
}

private void drawDownOrSelectedBg(Canvas canvas) {
// down and not up
if (downDate != null) {
drawCellBg(canvas, downIndex, surface.cellDownColor);
}
// selected bg color
if (!selectedEndDate.before(showFirstDate)
&& !selectedStartDate.after(showLastDate)) {
int[] section = new int[] { -1, -1 };
calendar.setTime(curDate);
calendar.add(Calendar.MONTH, -1);
findSelectedIndex(0, curStartIndex, calendar, section);
if (section[1] == -1) {
calendar.setTime(curDate);
findSelectedIndex(curStartIndex, curEndIndex, calendar, section);
}
if (section[1] == -1) {
calendar.setTime(curDate);
calendar.add(Calendar.MONTH, 1);
findSelectedIndex(curEndIndex, 42, calendar, section);
}
if (section[0] == -1) {
section[0] = 0;
}
if (section[1] == -1) {
section[1] = 41;
}
for (int i = section[0]; i <= section[1]; i++) {
drawCellBg(canvas, i, surface.cellSelectedColor);
}
}
}

private void findSelectedIndex(int startIndex, int endIndex,
Calendar calendar, int[] section) {
for (int i = startIndex; i < endIndex; i++) {
calendar.set(Calendar.DAY_OF_MONTH, date[i]);
Date temp = calendar.getTime();
// Log.d(TAG, "temp:" + temp.toLocaleString());
if (temp.compareTo(selectedStartDate) == 0) {
section[0] = i;
}
if (temp.compareTo(selectedEndDate) == 0) {
section[1] = i;
return;
}
}
}

public Date getSelectedStartDate() {
return selectedStartDate;
}

public Date getSelectedEndDate() {
return selectedEndDate;
}

private boolean isLastMonth(int i) {
if (i < curStartIndex) {
return true;
}
return false;
}

private boolean isNextMonth(int i) {
if (i >= curEndIndex) {
return true;
}
return false;
}

private int getXByIndex(int i) {
return i % 7 + 1; // 1 2 3 4 5 6 7
}

private int getYByIndex(int i) {
return i / 7 + 1; // 1 2 3 4 5 6
}

// 获得当前应该显示的年月
public String getYearAndmonth() {
calendar.setTime(curDate);
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH);
return year + "-" + surface.monthText[month];
}

//上一月
public String clickLeftMonth(){
calendar.setTime(curDate);
calendar.add(Calendar.MONTH, -1);
curDate = calendar.getTime();
invalidate();
return getYearAndmonth();
}
//下一月
public String clickRightMonth(){
calendar.setTime(curDate);
calendar.add(Calendar.MONTH, 1);
curDate = calendar.getTime();
invalidate();
return getYearAndmonth();
}

private void setSelectedDateByCoor(float x, float y) {
// change month
//      if (y < surface.monthHeight) {
//          // pre month
//          if (x < surface.monthChangeWidth) {
//              calendar.setTime(curDate);
//              calendar.add(Calendar.MONTH, -1);
//              curDate = calendar.getTime();
//          }
//          // next month
//          else if (x > surface.width - surface.monthChangeWidth) {
//              calendar.setTime(curDate);
//              calendar.add(Calendar.MONTH, 1);
//              curDate = calendar.getTime();
//          }
//      }
// cell click down
if (y > surface.monthHeight + surface.weekHeight) {
int m = (int) (Math.floor(x / surface.cellWidth) + 1);
int n = (int) (Math
.floor((y - (surface.monthHeight + surface.weekHeight))
/ Float.valueOf(surface.cellHeight)) + 1);
downIndex = (n - 1) * 7 + m - 1;
Log.d(TAG, "downIndex:" + downIndex);
calendar.setTime(curDate);
if (isLastMonth(downIndex)) {
calendar.add(Calendar.MONTH, -1);
} else if (isNextMonth(downIndex)) {
calendar.add(Calendar.MONTH, 1);
}
calendar.set(Calendar.DAY_OF_MONTH, date[downIndex]);
downDate = calendar.getTime();
}
invalidate();
}

@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
setSelectedDateByCoor(event.getX(), event.getY());
break;
case MotionEvent.ACTION_UP:
if (downDate != null) {
//              if (!completed) {
//                  if (downDate.before(selectedStartDate)) {
//                      selectedEndDate = selectedStartDate;
//                      selectedStartDate = downDate;
//                  } else {
//                      selectedEndDate = downDate;
//                  }
//                  completed = true;
//              } else {
//                  selectedStartDate = selectedEndDate = downDate;
//                  completed = false;
//              }
selectedStartDate = selectedEndDate = downDate;
//响应监听事件
onItemClickListener.OnItemClick(selectedStartDate);
// Log.d(TAG, "downdate:" + downDate.toLocaleString());
//Log.d(TAG, "start:" + selectedStartDate.toLocaleString());
//Log.d(TAG, "end:" + selectedEndDate.toLocaleString());
downDate = null;
invalidate();
}
break;
}
return true;
}

//给控件设置监听事件
public void setOnItemClickListener(OnItemClickListener onItemClickListener){
this.onItemClickListener =  onItemClickListener;
}
//监听接口
public interface OnItemClickListener {
void OnItemClick(Date date);
}

/**
*
* 1. 布局尺寸 2. 文字颜色，大小 3. 当前日期的颜色，选择的日期颜色
*/
private class Surface {
public float density;
public int width; // 整个控件的宽度
public int height; // 整个控件的高度
public float monthHeight; // 显示月的高度
//public float monthChangeWidth; // 上一月、下一月按钮宽度
public float weekHeight; // 显示星期的高度
public float cellWidth; // 日期方框宽度
public float cellHeight; // 日期方框高度
public float borderWidth;
public int bgColor = Color.parseColor("#FFFFFF");
private int textColor = Color.BLACK;
//private int textColorUnimportant = Color.parseColor("#666666");
private int btnColor = Color.parseColor("#666666");
private int borderColor = Color.parseColor("#CCCCCC");
public int todayNumberColor = Color.RED;
public int cellDownColor = Color.parseColor("#CCFFFF");
public int cellSelectedColor = Color.parseColor("#99CCFF");
public Paint borderPaint;
public Paint monthPaint;
public Paint weekPaint;
public Paint datePaint;
public Paint monthChangeBtnPaint;
public Paint cellBgPaint;
public Path boxPath; // 边框路径
//public Path preMonthBtnPath; // 上一月按钮三角形
//public Path nextMonthBtnPath; // 下一月按钮三角形
public String[] weekText = { "Sun","Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
public String[] monthText = {"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};

public void init() {
float temp = height / 7f;
monthHeight = 0;//(float) ((temp + temp * 0.3f) * 0.6);
//monthChangeWidth = monthHeight * 1.5f;
weekHeight = (float) ((temp + temp * 0.3f) * 0.7);
cellHeight = (height - monthHeight - weekHeight) / 6f;
cellWidth = width / 7f;
borderPaint = new Paint();
borderPaint.setColor(borderColor);
borderPaint.setStyle(Paint.Style.STROKE);
borderWidth = (float) (0.5 * density);
// Log.d(TAG, "borderwidth:" + borderWidth);
borderWidth = borderWidth < 1 ? 1 : borderWidth;
borderPaint.setStrokeWidth(borderWidth);
monthPaint = new Paint();
monthPaint.setColor(textColor);
monthPaint.setAntiAlias(true);
float textSize = cellHeight * 0.4f;
Log.d(TAG, "text size:" + textSize);
monthPaint.setTextSize(textSize);
monthPaint.setTypeface(Typeface.DEFAULT_BOLD);
weekPaint = new Paint();
weekPaint.setColor(textColor);
weekPaint.setAntiAlias(true);
float weekTextSize = weekHeight * 0.6f;
weekPaint.setTextSize(weekTextSize);
weekPaint.setTypeface(Typeface.DEFAULT_BOLD);
datePaint = new Paint();
datePaint.setColor(textColor);
datePaint.setAntiAlias(true);
float cellTextSize = cellHeight * 0.5f;
datePaint.setTextSize(cellTextSize);
datePaint.setTypeface(Typeface.DEFAULT_BOLD);
boxPath = new Path();
//boxPath.addRect(0, 0, width, height, Direction.CW);
//boxPath.moveTo(0, monthHeight);
boxPath.rLineTo(width, 0);
boxPath.moveTo(0, monthHeight + weekHeight);
boxPath.rLineTo(width, 0);
for (int i = 1; i < 6; i++) {
boxPath.moveTo(0, monthHeight + weekHeight + i * cellHeight);
boxPath.rLineTo(width, 0);
boxPath.moveTo(i * cellWidth, monthHeight);
boxPath.rLineTo(0, height - monthHeight);
}
boxPath.moveTo(6 * cellWidth, monthHeight);
boxPath.rLineTo(0, height - monthHeight);
//preMonthBtnPath = new Path();
//int btnHeight = (int) (monthHeight * 0.6f);
//preMonthBtnPath.moveTo(monthChangeWidth / 2f, monthHeight / 2f);
//preMonthBtnPath.rLineTo(btnHeight / 2f, -btnHeight / 2f);
//preMonthBtnPath.rLineTo(0, btnHeight);
//preMonthBtnPath.close();
//nextMonthBtnPath = new Path();
//nextMonthBtnPath.moveTo(width - monthChangeWidth / 2f,
//      monthHeight / 2f);
//nextMonthBtnPath.rLineTo(-btnHeight / 2f, -btnHeight / 2f);
//nextMonthBtnPath.rLineTo(0, btnHeight);
//nextMonthBtnPath.close();
monthChangeBtnPaint = new Paint();
monthChangeBtnPaint.setAntiAlias(true);
monthChangeBtnPaint.setStyle(Paint.Style.FILL_AND_STROKE);
monthChangeBtnPaint.setColor(btnColor);
cellBgPaint = new Paint();
cellBgPaint.setAntiAlias(true);
cellBgPaint.setStyle(Paint.Style.FILL);
cellBgPaint.setColor(cellSelectedColor);
}
}
}