android开发分享Android自定义View实现时钟功能

/**  * shape: 特效的path, 这里传一个矩形  * advance: 两个特效path之间的间距, 即两个矩形的left间距  * phase: 特效起始位置的偏移  * style: 原始path拐弯的时候特效path的转换方式,这里用rotate跟着旋转即可  */  pathdashpatheffect(path shape, float advance, float phase,                                style style)

sumpatheffect(patheffect first, patheffect second) 

//  // created by skylar on 2022/4/19.  //  class clockview : view {      private var mtimer: timer? = null      private val mcirclepaint: paint = paint()      private val mpointerpaint: paint = paint()      private val mtextpaint: paint = paint()        private val mcirclepath: path = path()      private val mhourpath: path = path()      private val mminutepath: path = path()      private val msecondpath: path = path()        private lateinit var mpathmeasure: pathmeasure      private lateinit var msumpatheffect: sumpatheffect        private var mviewwidth = 0      private var mviewheight = 0      private var mcirclewidth = 6f      private var mradius = 0f      private var mrectradius = 20f      private var mhoursdegree = 0f      private var mminutesdegree = 0f      private var msecondsdegree = 0f      private var mcurrenttimeinsecond = 0l        constructor(context: context) : super(context)        constructor(context: context, attrs: attributeset?) : this(context, attrs, 0)        constructor(          context: context, attrs: attributeset?,          defstyleattr: int      ) : super(context, attrs, defstyleattr)        init {          mcirclepaint.color = color.black          mcirclepaint.isantialias = true          mcirclepaint.style = paint.style.stroke          mcirclepaint.strokewidth = mcirclewidth            mpointerpaint.color = color.black          mpointerpaint.isantialias = true          mpointerpaint.style = paint.style.fill            mtextpaint.color = color.black          mtextpaint.isantialias = true          mtextpaint.style = paint.style.fill          mtextpaint.textsize = 40f      }        override fun onsizechanged(w: int, h: int, oldw: int, oldh: int) {          super.onsizechanged(w, h, oldw, oldh)          mviewwidth = measuredwidth - paddingleft - paddingright          mviewheight = measuredheight - paddingtop - paddingbottom            mradius = mviewwidth / 2 - mcirclewidth          mcirclepath.addcircle(0f, 0f, mradius, path.direction.cw)            mpathmeasure = pathmeasure(mcirclepath, false)          val minutesshapepath = path()          val quartershapepath = path()          minutesshapepath.addrect(0f, 0f, mradius * 0.01f, mradius * 0.06f, path.direction.cw)          quartershapepath.addrect(0f, 0f, mradius * 0.02f, mradius * 0.06f, path.direction.cw)          val minutesdashpatheffect = pathdashpatheffect(              minutesshapepath,              mpathmeasure.length / 60,              0f,              pathdashpatheffect.style.rotate          )          val quarterdashpatheffect = pathdashpatheffect(              quartershapepath,              mpathmeasure.length / 12,              0f,              pathdashpatheffect.style.rotate          )          msumpatheffect = sumpatheffect(minutesdashpatheffect, quarterdashpatheffect)            val hourpointerheight = mradius * 0.5f          val hourpointerwidth = mradius * 0.07f          val hourrect = rectf(              -hourpointerwidth / 2,              -hourpointerheight * 0.7f,              hourpointerwidth / 2,              hourpointerheight * 0.3f          )          mhourpath.addroundrect(hourrect, mrectradius, mrectradius, path.direction.cw)            val minutepointerheight = mradius * 0.7f          val minutepointerwidth = mradius * 0.05f          val minuterect = rectf(              -minutepointerwidth / 2,              -minutepointerheight * 0.8f,              minutepointerwidth / 2,              minutepointerheight * 0.2f          )          mminutepath.addroundrect(minuterect, mrectradius, mrectradius, path.direction.cw)            val secondpointerheight = mradius * 0.9f          val secondpointerwidth = mradius * 0.03f          val secondrect = rectf(              -secondpointerwidth / 2,              -secondpointerheight * 0.8f,              secondpointerwidth / 2,              secondpointerheight * 0.2f          )          msecondpath.addroundrect(secondrect, mrectradius, mrectradius, path.direction.cw)            startanimator()      }        override fun ondraw(canvas: canvas?) {          super.ondraw(canvas)          if (canvas == null) {              return          }          canvas.translate((mviewwidth / 2).tofloat(), (mviewheight / 2).tofloat())            //画圆盘          mcirclepaint.patheffect = null          canvas.drawpath(mcirclepath, mcirclepaint)            //画刻度          mcirclepaint.patheffect = msumpatheffect          canvas.drawpath(mcirclepath, mcirclepaint)            //时分秒指针          mpointerpaint.color = color.black            canvas.save()          canvas.rotate(mhoursdegree)          canvas.drawpath(mhourpath, mpointerpaint)          canvas.restore()            canvas.save()          canvas.rotate(mminutesdegree)          canvas.drawpath(mminutepath, mpointerpaint)          canvas.restore()            canvas.save()          canvas.rotate(msecondsdegree)          canvas.drawpath(msecondpath, mpointerpaint)          canvas.restore()            //画中心点          mpointerpaint.color = color.white          canvas.drawcircle(0f, 0f, mradius * 0.02f, mpointerpaint)      }          private fun startanimator() {          val cal = calendar.getinstance()          val hour = cal.get(calendar.hour)  //小时          val minute = cal.get(calendar.minute)  //分          val second = cal.get(calendar.second)  //秒          mcurrenttimeinsecond = (hour * 60 * 60 + minute * 60 + second).tolong()            if (mtimer == null) {              mtimer = timer()          } else {              mtimer?.cancel()              mtimertask.cancel()          }          mtimer?.schedule(mtimertask, 0, 1000)      }        private var mtimertask: timertask = object : timertask() {          override fun run() {              mcurrenttimeinsecond++              computedegree()              invalidate()          }      }        //12小时 00:00:00 ~ 12:00:00      private fun computedegree() {          val secondsinoneroll = 12 * 60 * 60          val currentseconds = mcurrenttimeinsecond % secondsinoneroll            var leftseconds = currentseconds          val hours = currentseconds / 60 / 60          leftseconds = currentseconds - hours * 60 * 60          val minutes = leftseconds / 60          leftseconds -= minutes * 60          val seconds = leftseconds % 60            mhoursdegree = hours * 30f          mminutesdegree = minutes * 6f          msecondsdegree = seconds * 6f        }  }