Android自定义View实现仿GitHub的提交活跃表格

说明

本文可能需要一些基础知识点,如Canvas,Paint,Path,Rect等类的基本使用,建议不熟悉的同学可以学习GcsSloop安卓自定义View教程目录,会帮助很大。

Android自定义View实现仿GitHub的提交活跃表格_第1张图片

上图就是github的提交表格,直观来看可以分为几个部分进行绘制:

(1)各个月份的小方格子,并且色彩根据提交次数变化,由浅到深
(2)右下边的颜色标志,我们右对齐就可以了
(3)左边的星期,原图是从周日画到周六,我们从周一画到周日
(4)上面的月份,我们只画出1-12月
(5)点击时候弹出当天的提交情况,由一个小三角和圆角矩形组成

需要解决的计算问题:

(1)生成任意一年的所有天,包含年月日周,提交次数,色块颜色,坐标
(1)一年中所有的小方格子坐标
(2)右下边颜色标志坐标
(3)左边星期坐标
(4)上面月份坐标
(5)点击弹出的提示框和文字坐标

生成某年所有天数

每天的信息我们需要封装成一个类,代码如下:

/**
 * Created by Administrator on 2017/1/13.
 * 封装每天的属性,方便在绘制的时候进行计算
 */
public class Day implements Serializable{
 /**年**/
 public int year;
 /**月**/
 public int month;
 /**日**/
 public int date;
 /**周几**/
 public int week;
 /**贡献次数,默认0**/
 public int contribution = 0;
 /**默认颜色,根据提交次数改变**/
 public int colour = 0xFFEEEEEE;
 /**方格坐标,左上点,右下点,确定矩形范围**/
 public float startX;
 public float startY;
 public float endX;
 public float endY;
 @Override
 public String toString() {
  //这里直接在弹出框中显示
  return ""+year+"年"+month+"月"+date+"日周"+week+","+contribution+"次";
 }
}

要想先绘制表格,需要计算出所有的天,这里计算一年中所有的天,我们通过从当年1月1日算起,到12月31日,因为星期是连续的,所以我们需要我们提供某年的1月1日是周几,比如2016年1月1日是周5,这里必要的参数是2016和周5,那么我们用一个类来实现该方法,代码如下:

public class DateFactory {
 /**平年map,对应月份和天数**/
 private static HashMap monthMap = new LinkedHashMap<>(12);
 /**闰年map,对应月份和天数**/
 private static HashMap leapMonthMap = new LinkedHashMap<>(12);
 static {
  //初始化map,只有2月份不同
  monthMap.put(1,31);leapMonthMap.put(1,31);
  monthMap.put(2,28);leapMonthMap.put(2,29);
  monthMap.put(3,31);leapMonthMap.put(3,31);
  monthMap.put(4,30);leapMonthMap.put(4,30);
  monthMap.put(5,31);leapMonthMap.put(5,31);
  monthMap.put(6,30);leapMonthMap.put(6,30);
  monthMap.put(7,31);leapMonthMap.put(7,31);
  monthMap.put(8,31);leapMonthMap.put(8,31);
  monthMap.put(9,30);leapMonthMap.put(9,30);
  monthMap.put(10,31);leapMonthMap.put(10,31);
  monthMap.put(11,30);leapMonthMap.put(11,30);
  monthMap.put(12,31);leapMonthMap.put(12,31);
 }
 /**
  * 输入年份和1月1日是周几
  * 闰年为366天,平年为365天
  * @param year 年份
  * @param weekday 该年1月1日为周几
  * @return 该年1月1日到12月31日所有的天数
  */
 public static List getDays(int year, int weekday) {
  List days = new ArrayList<>();
  boolean isLeapYear = isLeapYear(year);
  int dayNum = isLeapYear ? 366 : 365;
  Day day;
  int lastWeekday = weekday;
  for (int i = 1; i <= dayNum; i++) {
   day = new Day();
   day.year = year;
   //计算当天为周几,如果大于7就重置1
   day.week = lastWeekday<= 7 ? lastWeekday : 1;
   //计算当天为几月几号
   int[] monthAndDay = getMonthAndDay(isLeapYear, i);
   day.month = monthAndDay[0];
   day.date = monthAndDay[1];
   //记录下昨天是周几并+1
   lastWeekday = day.week;
   lastWeekday++;
   days.add(day);
  }
  checkDays(days);
  return days;
 }
 /**
  * 获取月和日
  * @param isLeapYear 是否闰年
  * @param currentDay 当前天数
  * @return 包含月和天的数组
  */
 public static int[] getMonthAndDay(boolean isLeapYear,int currentDay) {
  HashMap maps = isLeapYear?leapMonthMap:monthMap;
  Set> set = maps.entrySet();
  int count = 0;
  Map.Entry month = null;
  for (Map.Entry entry : set) {
   count+=entry.getValue();
   if (currentDay<=count){
    month = entry;
    break;
   }
  }
  if (month == null){
   throw new IllegalStateException("未找到所在的月份");
  }
  int day = month.getValue()-(count-currentDay);
  return new int[]{month.getKey(),day};
 }
 /**
  * 判断是闰年还是平年
  * @param year 年份
  * @return true 为闰年
  */
 public static boolean isLeapYear(int year) {
  return year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
 }
 /**
  * 检测生成的天数是否正常
  * @param days
  */
 private static void checkDays(List days) {
  if (days == null) {
   throw new IllegalArgumentException("天数为空");
  }
  if (days.size() != 365 && days.size() != 366) {
   throw new IllegalArgumentException("天数异常:" + days.size());
  }
 }
 public static void main(String[] args){
  //test
  List days = DateFactory.getDays(2016, 5);
  for (int i = 0; i < days.size(); i++) {
   System.out.println(days.get(i).toString());
  }
 }
}

具体的计算逻辑可以看看代码,不是很难,这样我们就能得到某年的所有天。

绘制天数格子

因为该view比较长,所以需要横屏显示,方便起见,这里我们也不再进行view的测量计算,也不再进行自定义属性,只关注其核心逻辑即可。

首先我们需要将需要的成员变量定义出来:

 /**灰色方格的默认颜色**/
 private final static int DEFAULT_BOX_COLOUR = 0xFFEEEEEE;
 /**提交次数颜色值**/
 private final static int[] COLOUR_LEVEL =
   new int[]{0xFF1E6823, 0xFF44A340, 0xFF8CC665, 0xFFD6E685, DEFAULT_BOX_COLOUR};
 /**星期**/
 private String[] weeks = new String[]{"Mon", "Wed", "Fri", "Sun"};
 /**月份**/
 private String[] months =
   new String[]{"Jan", "Feb", "Mar", "Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};
 /**默认的padding,绘制的时候不贴边画**/
 private int padding = 24;
 /**小方格的默认边长**/
 private int boxSide = 8;
 /**小方格间的默认间隔**/
 private int boxInterval = 2;
 /**所有周的列数**/
 private int column = 0;
 private List mDays;//一年中所有的天
 private Paint boxPaint;//方格画笔
 private Paint textPaint;//文字画笔
 private Paint infoPaint;//弹出框画笔
 private Paint.FontMetrics metrics;//测量文字
 private float downX;//按下的点的X坐标
 private float downY;//按下的点的Y坐标
 private Day clickDay;//按下所对应的天

这些提取的变量是慢慢增加的,在自定义的时候一下想不全的时候可以先写,等用到某些变量的时候就提取出来。
然后我们初始化一下数据:

public GitHubContributionView(Context context, AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
  initView();
 }
 public void initView() {
  mDays = DateFactory.getDays(2016, 5);
  //方格画笔
  boxPaint = new Paint();
  boxPaint.setStyle(Paint.Style.FILL);
  boxPaint.setStrokeWidth(2);
  boxPaint.setColor(DEFAULT_BOX_COLOUR);
  boxPaint.setAntiAlias(true);
  //文字画笔
  textPaint = new Paint();
  textPaint.setStyle(Paint.Style.FILL);
  textPaint.setColor(Color.GRAY);
  textPaint.setTextSize(12);
  textPaint.setAntiAlias(true);
  //弹出的方格信息画笔
  infoPaint = new Paint();
  infoPaint.setStyle(Paint.Style.FILL);
  infoPaint.setColor(0xCC888888);
  infoPaint.setTextSize(12);
  infoPaint.setAntiAlias(true);
  //将默认值转换px
  padding = UI.dp2px(getContext(), padding);
  boxSide = UI.dp2px(getContext(), boxSide);
  metrics = textPaint.getFontMetrics();
 }

这里我们以2016年来举例,mDays就是获取2016年的所有天的集合(参数可以当作自定义属性提取出来),相关的Paint也已经初始化好了,接下来就需要在onDraw方法里画,先画所有的方格子和月份标志:

 /**
  * 画出1-12月方格小块和上面的月份
  * @param canvas 画布
  */
 private void drawBox(Canvas canvas) {
  //方格的左上右下坐标
  float startX, startY, endX, endY;
  //起始月份为1月
  int month = 1;
  for (int i = 0; i < mDays.size(); i++) {
   Day day = mDays.get(i);
   if (i == 0){
    //画1月的文本标记,坐标应该是x=padding,y=padding-boxSide/2(间隙),y坐标在表格上面一点
    canvas.drawText(months[0],padding,padding-boxSide/2,textPaint);
   }
   if (day.week == 1 && i != 0) {
    //如果当天是周1,那么说明增加了一列
    column++;
    //如果列首的月份有变化,那么说明需要画月份
    if (day.month>month){
     month = day.month;
     //月份文本的坐标计算,x坐标在变化,而y坐标都是一样的,boxSide/2(间隙)
     canvas.drawText(months[month-1],padding+column*(boxSide+boxInterval),padding-boxSide/2,textPaint);
    }
   }
   //计算方格坐标点,x坐标随列数的增多而增加,y坐标随行数的增多而变化
   startX = padding + column * (boxSide + boxInterval);
   startY = padding + (day.week - 1) * (boxSide + boxInterval);
   endX = startX + boxSide;
   endY = startY + boxSide;
   //将该方格的坐标保存下来,这样可以在点击方格的时候计算弹框的坐标
   day.startX = startX;
   day.startY = startY;
   day.endX = endX;
   day.endY = endY;
   //给画笔设置当前天的颜色
   boxPaint.setColor(day.colour);
   canvas.drawRect(startX, startY, endX, endY, boxPaint);
  }
  boxPaint.setColor(DEFAULT_BOX_COLOUR);//恢复默认颜色
 }

这里主要是注意下行数列数的变化和月份坐标的计算,格子画好了。

绘制星期文本

我们再画左边的星期文本:

/**
  * 画左侧的星期
  * @param canvas 画布
  */
 private void drawWeek(Canvas canvas) {
  //文字是左对齐,所以找出最长的字
  float textLength = 0;
  for (String week : weeks) {
   float tempLength = textPaint.measureText(week);
   if (textLength < tempLength) {
    textLength = tempLength;
   }
  }
  //依次画出星期文本,坐标点x=padding-文本长度-文本和方格的间隙,y坐标随行数变化
  canvas.drawText(weeks[0], padding - textLength - 2, padding + boxSide - metrics.descent, textPaint);
  canvas.drawText(weeks[1], padding - textLength - 2, padding + 3 * (boxSide + boxInterval) - metrics.descent, textPaint);
  canvas.drawText(weeks[2], padding - textLength - 2, padding + 5 * (boxSide + boxInterval) - metrics.descent, textPaint);
  canvas.drawText(weeks[3], padding - textLength - 2, padding + 7 * (boxSide + boxInterval) - metrics.descent, textPaint);
 }

绘制颜色深浅标志

然后根据表格的高度再画出右下边的颜色深浅标志:

/**
  * 画出右下角的颜色深浅标志,因为是右对齐的所以需要从右往左画
  * @param canvas 画布
  */
 private void drawTag(Canvas canvas) {
  //首先计算出两个文本的长度
  float moreLength = textPaint.measureText("More");
  float lessLength = textPaint.measureText("Less");
  //画 More 文本,x坐标=padding+(列数+1)*(方格边长+方格间隙)-一个方格间隙-文本长度
  float moreX = padding + (column + 1) * (boxSide + boxInterval) - boxInterval - moreLength;
  //y坐标=padding+(方格行数+1,和表格底部有些距离)*(方格边长+方格间隙)+字体的ascent高度
  float moreY = padding + 8 * (boxSide + boxInterval) + Math.abs(metrics.ascent);
  canvas.drawText("More", moreX, moreY, textPaint);
  //画深浅色块,坐标根据上面的More依次计算就可以了
  float interval = boxSide - 2;//文字和色块间的距离
  float leftX = moreX - interval - boxSide;
  float topY = moreY - boxSide;
  float rightX = moreX - interval;
  float bottomY = moreY;//色块的Y坐标是一样的
  for (int i = 0; i < COLOUR_LEVEL.length; i++) {
   boxPaint.setColor(COLOUR_LEVEL[i]);
   canvas.drawRect(leftX - i * (boxSide + boxInterval), topY, rightX - i * (boxSide + boxInterval), bottomY, boxPaint);
  }
  //最后画 Less 文本,原理同上
  canvas.drawText("Less", leftX - 4 * (boxSide + boxInterval) - interval - lessLength, moreY, textPaint);
 }

这样整个表格主体绘制完成。

处理点击事件

接下来要处理点击事件,判断点击的坐标如果在方格内,那么弹出对于的文本框,先处理点击事件:

 @Override
 public boolean onTouchEvent(MotionEvent event) {
  //获取ACTION_DOWN的坐标,用来判断点在哪天,并弹出・
  if (MotionEvent.ACTION_DOWN == event.getAction()) {
   downX = event.getX();
   downY = event.getY();
   findClickBox();
  }
  //这里因为我们只是记录坐标点,不对事件进行拦截所以默认返回
  return super.onTouchEvent(event);
 }

判断是否在方格内:

 /**
  * 判断是否点击在方格内
  */
 private void findClickBox() {
  for (Day day : mDays) {
   //检测点击的坐标如果在方格内,则弹出信息提示
   if (downX >= day.startX && downX <= day.endX && downY >= day.startY && downY <= day.endY) {
    clickDay = day;//纪录点击的哪天
    break;
   }
  }
  //点击完要刷新,这样每次点击不同的方格,弹窗就可以在相应的位置显示
  refreshView();
 }
 /**
  * 点击弹出文字提示
  */
 private void refreshView() {
  invalidate();
 }

绘制弹出文本框

然后看看弹出文本框的绘制:

/**
  * 画方格上的文字弹框
  * @param canvas 画布
  */
 private void drawPopupInfo(Canvas canvas) {
  if (clickDay != null) {//点击的天不为null时候才画
   //先根据方格来画出一个小三角形,坐标就是方格的中间
   Path infoPath = new Path();
   //先从方格中心
   infoPath.moveTo(clickDay.startX + boxSide / 2, clickDay.startY + boxSide / 2);
   //然后是方格的左上点
   infoPath.lineTo(clickDay.startX, clickDay.startY);
   //然后是方格的右上点
   infoPath.lineTo(clickDay.endX, clickDay.startY);
   //画出三角
   canvas.drawPath(infoPath,infoPaint);
   //画三角上的圆角矩形
   textPaint.setColor(Color.WHITE);
   //得到当天的文本信息
   String popupInfo = clickDay.toString();
   System.out.println(popupInfo);
   //计算文本的高度和长度用以确定矩形的大小
   float infoHeight = metrics.descent - metrics.ascent;
   float infoLength = textPaint.measureText(popupInfo);
   Log.e("height",infoHeight+"");
   Log.e("length",infoLength+"");
   //矩形左上点应该是x=当前天的x+边长/2-(文本长度/2+文本和框的间隙)
   float leftX = (clickDay.startX + boxSide / 2 ) - (infoLength / 2 + boxSide);
   //矩形左上点应该是y=当前天的y+边长/2-(文本高度+上下文本和框的间隙)
   float topY = clickDay.startY-(infoHeight+2*boxSide);
   //矩形的右下点应该是x=leftX+文本长度+文字两边和矩形的间距
   float rightX = leftX+infoLength+2*boxSide;
   //矩形的右下点应该是y=当前天的y
   float bottomY = clickDay.startY;
   System.out.println(""+leftX+"/"+topY+"/"+rightX+"/"+bottomY);
   RectF rectF = new RectF(leftX, topY, rightX, bottomY);
   canvas.drawRoundRect(rectF,4,4,infoPaint);
   //绘制文字,x=leftX+文字和矩形间距,y=topY+文字和矩形上面间距+文字顶到基线高度
   canvas.drawText(popupInfo,leftX+boxSide,topY+boxSide+Math.abs(metrics.ascent),textPaint);
   clickDay = null;//重新置空,保证点击方格外信息消失
   textPaint.setColor(Color.GRAY);//恢复画笔颜色
  }
 }

这样主体逻辑完成,但需要开放设置某天提交次数的方法:

/**
  * 设置某天的次数
  * @param year 年
  * @param month 月
  * @param day 日
  * @param contribution 次数
  */
 public void setData(int year,int month,int day,int contribution){
  //先找到是第几天,为了方便不做参数检测了
  for (Day d : mDays) {
   if (d.year == year && d.month == month && d.date == day){
    d.contribution = contribution;
    d.colour = getColour(contribution);
    break;
   }
  }
  refreshView();
 }
 /**
  * 根据提交次数来获取颜色值
  * @param contribution 提交的次数
  * @return 颜色值
  */
 private int getColour(int contribution){
  int colour = 0;
  if (contribution <= 0){
   colour = COLOUR_LEVEL[4];
  }
  if (contribution == 1){
   colour = COLOUR_LEVEL[3];
  }
  if (contribution == 2){
   colour = COLOUR_LEVEL[2];
  }
  if (contribution == 3){
   colour = COLOUR_LEVEL[1];
  }
  if (contribution >= 4){
   colour = COLOUR_LEVEL[0];
  }
  return colour;
 }

好了,所有逻辑完成,主要涉及到一些计算,完整代码:

/**
 * Created by Administrator on 2017/1/13.
 * 仿GitHub的提交活跃表
 * 横屏使用
 */
public class GitHubContributionView extends View {
 /**灰色方格的默认颜色**/
 private final static int DEFAULT_BOX_COLOUR = 0xFFEEEEEE;
 /**提交次数颜色值**/
 private final static int[] COLOUR_LEVEL =
   new int[]{0xFF1E6823, 0xFF44A340, 0xFF8CC665, 0xFFD6E685, DEFAULT_BOX_COLOUR};
 /**星期**/
 private String[] weeks = new String[]{"Mon", "Wed", "Fri", "Sun"};
 /**月份**/
 private String[] months =
   new String[]{"Jan", "Feb", "Mar", "Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};
 /**默认的padding,绘制的时候不贴边画**/
 private int padding = 24;
 /**小方格的默认边长**/
 private int boxSide = 8;
 /**小方格间的默认间隔**/
 private int boxInterval = 2;
 /**所有周的列数**/
 private int column = 0;
 private List mDays;//一年中所有的天
 private Paint boxPaint;//方格画笔
 private Paint textPaint;//文字画笔
 private Paint infoPaint;//弹出框画笔
 private Paint.FontMetrics metrics;//测量文字
 private float downX;//按下的点的X坐标
 private float downY;//按下的点的Y坐标
 private Day clickDay;//按下所对应的天
 public GitHubContributionView(Context context) {
  this(context, null);
 }
 public GitHubContributionView(Context context, AttributeSet attrs) {
  this(context, attrs, 0);
 }
 public GitHubContributionView(Context context, AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
  initView();
 }
 public void initView() {
  mDays = DateFactory.getDays(2016, 5);
  //方格画笔
  boxPaint = new Paint();
  boxPaint.setStyle(Paint.Style.FILL);
  boxPaint.setStrokeWidth(2);
  boxPaint.setColor(DEFAULT_BOX_COLOUR);
  boxPaint.setAntiAlias(true);
  //文字画笔
  textPaint = new Paint();
  textPaint.setStyle(Paint.Style.FILL);
  textPaint.setColor(Color.GRAY);
  textPaint.setTextSize(12);
  textPaint.setAntiAlias(true);
  //弹出的方格信息画笔
  infoPaint = new Paint();
  infoPaint.setStyle(Paint.Style.FILL);
  infoPaint.setColor(0xCC888888);
  infoPaint.setTextSize(12);
  infoPaint.setAntiAlias(true);
  //将默认值转换px
  padding = UI.dp2px(getContext(), padding);
  boxSide = UI.dp2px(getContext(), boxSide);
  metrics = textPaint.getFontMetrics();
 }
 @Override
 protected void onSizeChanged(int w, int h, int oldw, int oldh) {
  super.onSizeChanged(w, h, oldw, oldh);
 }
 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  column = 0;
  canvas.save();
  drawBox(canvas);
  drawWeek(canvas);
  drawTag(canvas);
  drawPopupInfo(canvas);
  canvas.restore();
 }
 /**
  * 画出1-12月方格小块和上面的月份
  * @param canvas 画布
  */
 private void drawBox(Canvas canvas) {
  //方格的左上右下坐标
  float startX, startY, endX, endY;
  //起始月份为1月
  int month = 1;
  for (int i = 0; i < mDays.size(); i++) {
   Day day = mDays.get(i);
   if (i == 0){
    //画1月的文本标记,坐标应该是x=padding,y=padding-boxSide/2(间隙),y坐标在表格上面一点
    canvas.drawText(months[0],padding,padding-boxSide/2,textPaint);
   }
   if (day.week == 1 && i != 0) {
    //如果当天是周1,那么说明增加了一列
    column++;
    //如果列首的月份有变化,那么说明需要画月份
    if (day.month>month){
     month = day.month;
     //月份文本的坐标计算,x坐标在变化,而y坐标都是一样的,boxSide/2(间隙)
     canvas.drawText(months[month-1],padding+column*(boxSide+boxInterval),padding-boxSide/2,textPaint);
    }
   }
   //计算方格坐标点,x坐标一致随列数的增多而增加,y坐标随行数的增多而变化
   startX = padding + column * (boxSide + boxInterval);
   startY = padding + (day.week - 1) * (boxSide + boxInterval);
   endX = startX + boxSide;
   endY = startY + boxSide;
   //将该方格的坐标保存下来,这样可以在点击方格的时候计算弹框的坐标
   day.startX = startX;
   day.startY = startY;
   day.endX = endX;
   day.endY = endY;
   //给画笔设置当前天的颜色
   boxPaint.setColor(day.colour);
   canvas.drawRect(startX, startY, endX, endY, boxPaint);
  }
  boxPaint.setColor(DEFAULT_BOX_COLOUR);//恢复默认颜色
 }
 /**
  * 画左侧的星期
  * @param canvas 画布
  */
 private void drawWeek(Canvas canvas) {
  //文字是左对齐,所以找出最长的字
  float textLength = 0;
  for (String week : weeks) {
   float tempLength = textPaint.measureText(week);
   if (textLength < tempLength) {
    textLength = tempLength;
   }
  }
  //依次画出星期文本,坐标点x=padding-文本长度-文本和方格的间隙,y坐标随行数变化
  canvas.drawText(weeks[0], padding - textLength - 2, padding + boxSide - metrics.descent, textPaint);
  canvas.drawText(weeks[1], padding - textLength - 2, padding + 3 * (boxSide + boxInterval) - metrics.descent, textPaint);
  canvas.drawText(weeks[2], padding - textLength - 2, padding + 5 * (boxSide + boxInterval) - metrics.descent, textPaint);
  canvas.drawText(weeks[3], padding - textLength - 2, padding + 7 * (boxSide + boxInterval) - metrics.descent, textPaint);
 }
 /**
  * 画出右下角的颜色深浅标志,因为是右对齐的所以需要从右往左画
  * @param canvas 画布
  */
 private void drawTag(Canvas canvas) {
  //首先计算出两个文本的长度
  float moreLength = textPaint.measureText("More");
  float lessLength = textPaint.measureText("Less");
  //画 More 文本,x坐标=padding+(列数+1)*(方格边长+方格间隙)-一个方格间隙-文本长度
  float moreX = padding + (column + 1) * (boxSide + boxInterval) - boxInterval - moreLength;
  //y坐标=padding+(方格行数+1,和表格底部有些距离)*(方格边长+方格间隙)+字体的ascent高度
  float moreY = padding + 8 * (boxSide + boxInterval) + Math.abs(metrics.ascent);
  canvas.drawText("More", moreX, moreY, textPaint);
  //画深浅色块,坐标根据上面的More依次计算就可以了
  float interval = boxSide - 2;//文字和色块间的距离
  float leftX = moreX - interval - boxSide;
  float topY = moreY - boxSide;
  float rightX = moreX - interval;
  float bottomY = moreY;//色块的Y坐标是一样的
  for (int i = 0; i < COLOUR_LEVEL.length; i++) {
   boxPaint.setColor(COLOUR_LEVEL[i]);
   canvas.drawRect(leftX - i * (boxSide + boxInterval), topY, rightX - i * (boxSide + boxInterval), bottomY, boxPaint);
  }
  //最后画 Less 文本,原理同上
  canvas.drawText("Less", leftX - 4 * (boxSide + boxInterval) - interval - lessLength, moreY, textPaint);
 }
 @Override
 public boolean onTouchEvent(MotionEvent event) {
  //获取点击时候的坐标,用来判断点在哪天,并弹出・
  if (MotionEvent.ACTION_DOWN == event.getAction()) {
   downX = event.getX();
   downY = event.getY();
   findClickBox();
  }
  return super.onTouchEvent(event);
 }
 /**
  * 判断是否点击在方格内
  */
 private void findClickBox() {
  for (Day day : mDays) {
   //检测点击的坐标如果在方格内,则弹出信息提示
   if (downX >= day.startX && downX <= day.endX && downY >= day.startY && downY <= day.endY) {
    clickDay = day;//纪录点击的哪天
    break;
   }
  }
  //点击完要刷新,这样每次点击不同的方格,弹窗就可以在相应的位置显示
  refreshView();
 }
 /**
  * 点击弹出文字提示
  */
 private void refreshView() {
  invalidate();
 }
 /**
  * 画方格上的文字弹框
  * @param canvas 画布
  */
 private void drawPopupInfo(Canvas canvas) {
  if (clickDay != null) {
   //先根据方格来画出一个小三角形,坐标就是方格的中间
   Path infoPath = new Path();
   //先从方格中心
   infoPath.moveTo(clickDay.startX + boxSide / 2, clickDay.startY + boxSide / 2);
   //然后是方格的左上点
   infoPath.lineTo(clickDay.startX, clickDay.startY);
   //然后是方格的右上点
   infoPath.lineTo(clickDay.endX, clickDay.startY);
   //画出三角
   canvas.drawPath(infoPath,infoPaint);
   //画三角上的圆角矩形
   textPaint.setColor(Color.WHITE);
   //得到当天的文本信息
   String popupInfo = clickDay.toString();
   System.out.println(popupInfo);
   //计算文本的高度和长度用以确定矩形的大小
   float infoHeight = metrics.descent - metrics.ascent;
   float infoLength = textPaint.measureText(popupInfo);
   Log.e("height",infoHeight+"");
   Log.e("length",infoLength+"");
   //矩形左上点应该是x=当前天的x+边长/2-(文本长度/2+文本和框的间隙)
   float leftX = (clickDay.startX + boxSide / 2 ) - (infoLength / 2 + boxSide);
   //矩形左上点应该是y=当前天的y+边长/2-(文本高度+上下文本和框的间隙)
   float topY = clickDay.startY-(infoHeight+2*boxSide);
   //矩形的右下点应该是x=leftX+文本长度+文字两边和矩形的间距
   float rightX = leftX+infoLength+2*boxSide;
   //矩形的右下点应该是y=当前天的y
   float bottomY = clickDay.startY;
   System.out.println(""+leftX+"/"+topY+"/"+rightX+"/"+bottomY);
   RectF rectF = new RectF(leftX, topY, rightX, bottomY);
   canvas.drawRoundRect(rectF,4,4,infoPaint);
   //绘制文字,x=leftX+文字和矩形间距,y=topY+文字和矩形上面间距+文字顶到基线高度
   canvas.drawText(popupInfo,leftX+boxSide,topY+boxSide+Math.abs(metrics.ascent),textPaint);
   clickDay = null;//重新置空,保证点击方格外信息消失
   textPaint.setColor(Color.GRAY);//恢复画笔颜色
  }
 }
 /**
  * 设置某天的次数
  * @param year 年
  * @param month 月
  * @param day 日
  * @param contribution 次数
  */
 public void setData(int year,int month,int day,int contribution){
  //先找到是第几天,为了方便不做参数检测了
  for (Day d : mDays) {
   if (d.year == year && d.month == month && d.date == day){
    d.contribution = contribution;
    d.colour = getColour(contribution);
    break;
   }
  }
  refreshView();
 }
 /**
  * 根据提交次数来获取颜色值
  * @param contribution 提交的次数
  * @return 颜色值
  */
 private int getColour(int contribution){
  int colour = 0;
  if (contribution <= 0){
   colour = COLOUR_LEVEL[4];
  }
  if (contribution == 1){
   colour = COLOUR_LEVEL[3];
  }
  if (contribution == 2){
   colour = COLOUR_LEVEL[2];
  }
  if (contribution == 3){
   colour = COLOUR_LEVEL[1];
  }
  if (contribution >= 4){
   colour = COLOUR_LEVEL[0];
  }
  return colour;
 }
}

这样弄个布局测试下:



 

随机弄些数据:

public class MainActivity extends AppCompatActivity {
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  GitHubContributionView github = (GitHubContributionView) findViewById(R.id.cc_chart);
  github.setData(2016,12,9,2);
  github.setData(2016,11,9,1);
  github.setData(2016,10,5,10);
  github.setData(2016,8,9,3);
  github.setData(2016,4,20,2);
  github.setData(2016,12,13,3);
  github.setData(2016,12,14,3);
  github.setData(2016,2,15,4);
 }
}

效果

gif没有录好,看看图片效果:

Android自定义View实现仿GitHub的提交活跃表格_第2张图片

查看源码

以上所述是小编给大家介绍的Android自定义View实现仿GitHub的提交活跃表格,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持!

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