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安卓自定义View实现钟表

时间：2015-05-06 17:57:55      阅读：240      评论：0      收藏：0      [点我收藏+]

标签：自定义view

    转载请注明出处：http://blog.csdn.net/baiyuliang2013/article/details/45535227

       之前实现过html5版的钟表，html5也有一个画板属性Canvas，相对于安卓的Canvas来说html5的功能要强大的多，就拿钟表的实现，html5要方便简单的多，而安卓实现起来则非常复杂，像指针转动，html5可以画一条线，然后可以用这条线旋转一个弧度即可，而安卓必须是已知起点坐标和终点坐标，这就需要精确计算起始坐标了。先看下效果图，因为是图静态的，动态图也懒得做，所以看个大致效果即可，具体效果可以下载demo观看：

技术分享

这个钟表并不算完美，正常的钟表，秒针每转动一格，分针和时针都会跟着转动相应的弧度，但本例中偷了个懒，只有秒针转一周时，分针才移动一小格，分针转一周时，时针移动一大格，不满一周的情况下不动，因为画线需要精确的坐标值，如果做到这种效果那工作量可就大了去了，因此我们知道原理即可。

实现思路：

1.重写View，并在ondraw方法中绘图；

2.定义边框宽度，刻度宽度，长度，指针宽度，长度，计算圆心坐标及表盘半径；

3.绘制边框：

mPaint.setStrokeWidth(bordWidth); // 设置圆环的宽度  
        mPaint.setColor(bordColor);
		canvas.drawCircle(getWidth()/2, getWidth()/2, r, mPaint);

4.绘制刻度： 

//画刻度
		//12
		mPaint.setStrokeWidth(timeLineB_W);
		mPaint.setColor(timeColor);
		canvas.drawLine(circleX,bordWidth, circleX, bordWidth+timeLineB_H, mPaint);
		//12-1
		mPaint.setStrokeWidth(timeLineS_W);
		for(int i=1;i<6;i++){
			canvas.drawLine((float)(circleX+r*Math.cos(Math.toRadians(90-i*6)) ),(float)(circleX-r*Math.cos(Math.toRadians(i*6))), (float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(90-i*6))),(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(i*6))),mPaint);
		}
		//1
		mPaint.setStrokeWidth(timeLineB_W);
		canvas.drawLine((float)(circleX+r*Math.cos(Math.toRadians(60)) ),(float)(circleX-r*Math.cos(Math.toRadians(30))), (float)(circleX+(r-timeLineB_H)*Math.cos(Math.toRadians(60))),(float)(circleX-(r-timeLineB_H)*Math.cos(Math.toRadians(30))),mPaint);
		//1-2
		mPaint.setStrokeWidth(timeLineS_W);
		for(int i=1;i<6;i++){
			canvas.drawLine((float)(circleX+r*Math.cos(Math.toRadians(90-30-i*6)) ),(float)(circleX-r*Math.cos(Math.toRadians(30+i*6))), (float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(90-30-i*6))),(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(30+i*6))),mPaint);
		}
		//2
		mPaint.setStrokeWidth(timeLineB_W);
		canvas.drawLine((float)(circleX+r*Math.cos(Math.toRadians(30)) ),(float)(circleX-r*Math.cos(Math.toRadians(60))), (float)(circleX+(r-timeLineB_H)*Math.cos(Math.toRadians(30))),(float)(circleX-(r-timeLineB_H)*Math.cos(Math.toRadians(60))),mPaint);
	   //2-3
		mPaint.setStrokeWidth(timeLineS_W);
		for(int i=1;i<6;i++){
			canvas.drawLine((float)(circleX+r*Math.cos(Math.toRadians(90-60-i*6)) ),(float)(circleX-r*Math.cos(Math.toRadians(60+i*6))), (float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(90-60-i*6))),(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(60+i*6))),mPaint);
		}
		//3
		mPaint.setStrokeWidth(timeLineB_W);
		canvas.drawLine(getWidth()-bordWidth, circleX, getWidth()-bordWidth-timeLineB_H, circleX, mPaint);
		//3-4
		mPaint.setStrokeWidth(timeLineS_W);
		for(int i=1;i<6;i++){
			canvas.drawLine((float)(circleX+r*Math.cos(Math.toRadians(i*6)) ),(float)(circleX+r*Math.cos(Math.toRadians(90-i*6))), (float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(i*6))),(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(90-i*6))),mPaint);
		}
		//4
		mPaint.setStrokeWidth(timeLineB_W);
		canvas.drawLine((float)(circleX+r*Math.cos(Math.toRadians(30)) ),(float)(circleX+r*Math.cos(Math.toRadians(60))), (float)(circleX+(r-timeLineB_H)*Math.cos(Math.toRadians(30))),(float)(circleX+(r-timeLineB_H)*Math.cos(Math.toRadians(60))),mPaint);
		//4-5
		mPaint.setStrokeWidth(timeLineS_W);
		for(int i=1;i<6;i++){
			canvas.drawLine((float)(circleX+r*Math.cos(Math.toRadians(30+i*6)) ),(float)(circleX+r*Math.cos(Math.toRadians(90-30-i*6))), (float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(30+i*6))),(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(90-30-i*6))),mPaint);
		}
		//5
		mPaint.setStrokeWidth(timeLineB_W);
		canvas.drawLine((float)(circleX+r*Math.cos(Math.toRadians(60)) ),(float)(circleX+r*Math.cos(Math.toRadians(30))), (float)(circleX+(r-timeLineB_H)*Math.cos(Math.toRadians(60))),(float)(circleX+(r-timeLineB_H)*Math.cos(Math.toRadians(30))),mPaint);
		//5-6
		mPaint.setStrokeWidth(timeLineS_W);
		for(int i=1;i<6;i++){
			canvas.drawLine((float)(circleX+r*Math.cos(Math.toRadians(60+i*6)) ),(float)(circleX+r*Math.cos(Math.toRadians(90-60-i*6))), (float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(60+i*6))),(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(90-60-i*6))),mPaint);
		}
		//6
		mPaint.setStrokeWidth(timeLineB_W);
		canvas.drawLine(circleX,getWidth()-bordWidth, circleX, getWidth()-bordWidth-timeLineB_H,mPaint);
		
		//6-7
		mPaint.setStrokeWidth(timeLineS_W);
		for(int i=1;i<6;i++){
			canvas.drawLine((float)(circleX-r*Math.cos(Math.toRadians(90-i*6)) ),(float)(circleX+r*Math.cos(Math.toRadians(i*6))), (float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(90-i*6))),(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(i*6))),mPaint);
		}
		//7
		mPaint.setStrokeWidth(timeLineB_W);
		canvas.drawLine((float)(circleX-r*Math.cos(Math.toRadians(60)) ),(float)(circleX+r*Math.cos(Math.toRadians(30))), (float)(circleX-(r-timeLineB_H)*Math.cos(Math.toRadians(60))),(float)(circleX+(r-timeLineB_H)*Math.cos(Math.toRadians(30))),mPaint);
		//7-8
		mPaint.setStrokeWidth(timeLineS_W);
		for(int i=1;i<6;i++){
			canvas.drawLine((float)(circleX-r*Math.cos(Math.toRadians(90-30-i*6)) ),(float)(circleX+r*Math.cos(Math.toRadians(30+i*6))), (float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(90-30-i*6))),(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(30+i*6))),mPaint);
		}
		//8
		mPaint.setStrokeWidth(timeLineB_W);
		canvas.drawLine((float)(circleX-r*Math.cos(Math.toRadians(30)) ),(float)(circleX+r*Math.cos(Math.toRadians(60))), (float)(circleX-(r-timeLineB_H)*Math.cos(Math.toRadians(30))),(float)(circleX+(r-timeLineB_H)*Math.cos(Math.toRadians(60))),mPaint);
		//8-9
		mPaint.setStrokeWidth(timeLineS_W);
		for(int i=1;i<6;i++){
			canvas.drawLine((float)(circleX-r*Math.cos(Math.toRadians(90-60-i*6)) ),(float)(circleX+r*Math.cos(Math.toRadians(60+i*6))), (float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(90-60-i*6))),(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(60+i*6))),mPaint);
		}
		//9
		mPaint.setStrokeWidth(timeLineB_W);
		canvas.drawLine(bordWidth,circleX, bordWidth+timeLineB_H, circleX,mPaint);
		//9-10
		mPaint.setStrokeWidth(timeLineS_W);
		for(int i=1;i<6;i++){
			canvas.drawLine((float)(circleX-r*Math.cos(Math.toRadians(i*6)) ),(float)(circleX-r*Math.cos(Math.toRadians(90-i*6))), (float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(i*6))),(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(90-i*6))),mPaint);
		}
		//10
		mPaint.setStrokeWidth(timeLineB_W);
		canvas.drawLine((float)(circleX-r*Math.cos(Math.toRadians(30)) ),(float)(circleX-r*Math.cos(Math.toRadians(60))), (float)(circleX-(r-timeLineB_H)*Math.cos(Math.toRadians(30))),(float)(circleX-(r-timeLineB_H)*Math.cos(Math.toRadians(60))),mPaint);
		//10-11
		mPaint.setStrokeWidth(timeLineS_W);
		for(int i=1;i<6;i++){
			canvas.drawLine((float)(circleX-r*Math.cos(Math.toRadians(30+i*6)) ),(float)(circleX-r*Math.cos(Math.toRadians(90-30-i*6))), (float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(30+i*6))),(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(90-30-i*6))),mPaint);
		}
		//11
		mPaint.setStrokeWidth(timeLineB_W);
		canvas.drawLine((float)(circleX-r*Math.cos(Math.toRadians(60)) ),(float)(circleX-r*Math.cos(Math.toRadians(30))), (float)(circleX-(r-timeLineB_H)*Math.cos(Math.toRadians(60))),(float)(circleX-(r-timeLineB_H)*Math.cos(Math.toRadians(30))),mPaint);
		//11-12
		mPaint.setStrokeWidth(timeLineS_W);
		for(int i=1;i<6;i++){
			canvas.drawLine((float)(circleX-r*Math.cos(Math.toRadians(60+i*6)) ),(float)(circleX-r*Math.cos(Math.toRadians(90-60-i*6))), (float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(60+i*6))),(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(90-60-i*6))),mPaint);
		}
刻度是逐一计算起始点坐标并绘制的，拿1点的刻度来说，

技术分享

已知圆心坐标（x,y）,半径r，AB长度为a，求A点B点坐标。这应该是初中的题目了吧，很好计算，只要求出A点到y轴和x轴的距离，B点到y轴和x轴的距离即可（最方便的办法就是利用正余玄函数了，而Java也提供了正余玄函数的算法：Math.cos(Math.toRadians(角度值)，因为Math.cos传的是弧度，所以要将角度转化为弧度如Math.toRadians(60)），当然要注意屏幕坐标与数学中的象限坐标是不同的，所以AB点坐标要用求出的距离值结合圆的半径求出该点在屏幕中的实际坐标，然后画线即可。

5.绘制指针交点：

mPaint.setStrokeWidth(2);
		mPaint.setStyle(Paint.Style.FILL);
		canvas.drawCircle(circleX,circleX, 10, mPaint);
6.秒针转动：

到这里，我们得思考下，钟表是要动的啊，那怎么实现打开应用钟表就开始走呢？很简单吧，初始化View时，在View的构造方法中开启个线程去不断重绘View即可，时间间隔当然为一秒，这也就给你视觉感是指针一秒转动一次，另外需要你对秒针分针时针转动时相互关联所走的角度有一个清晰的思路，如果你连他们之间的关系都搞不明白，那看代码就更不用说了：

						 while (true){  
		                    if (ss == 360){  
		                    	mm++;//秒针每转一圈，分针走一格，一格6度，一圈60格
		                    	if(mm==60){
		                    		hh++;//分针转一圈，时针走一格，一格30度，一圈12格
		                    		if(hh==12){
		                    			hh=0;
		                    		}
		                    		mm=0;
		                    	}
		                        ss = 0;  
		                    }  
		                    	postInvalidate();  //重绘
		                    try{  
		                        Thread.sleep(1000);  //暂停1秒
		                    } catch (InterruptedException e){  
		                        e.printStackTrace();  
		                    }  
		                    ss+=6; //360度，分针每秒转动6度
		                }

秒针转动： 

mPaint.setStrokeWidth(timeLineS_W-5);//设置秒针宽度
		mPaint.setColor(pointColor);
		r=r-timeLineB_H-5;//设置秒针长度
		//分针随秒针转动
		if(ss<=30){
			canvas.drawLine(circleX,circleX,(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(90-ss*1))),(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(ss*1))), mPaint);
		}else if(ss<=60){
			canvas.drawLine(circleX,circleX,(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(90-30-(ss-30)*1))),(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(30+(ss-30)*1))), mPaint);
		}else if(ss<=90){
			canvas.drawLine(circleX,circleX,(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(90-60-(ss-60)*1))),(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(60+(ss-60)*1))), mPaint);
		}else if(ss<=120){
			canvas.drawLine(circleX,circleX,(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians((ss-90)*1))),(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(90-(ss-90)*1))), mPaint);
		}else if(ss<=150){
			canvas.drawLine(circleX,circleX,(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(30+(ss-120)*1))),(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(90-30-(ss-120)*1))), mPaint);
		}else if(ss<=180){
			canvas.drawLine(circleX,circleX,(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(60+(ss-150)*1))),(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(90-60-(ss-150)*1))), mPaint);
		}else if(ss<=210){
			canvas.drawLine(circleX,circleX,(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(90-(ss-180)*1))),(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians((ss-180)*1))), mPaint);
		}else if(ss<=240){
			canvas.drawLine(circleX,circleX,(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(90-30-(ss-210)*1))),(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(30+(ss-210)*1))), mPaint);
		}else if(ss<=270){
			canvas.drawLine(circleX,circleX,(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(90-60-(ss-240)*1))),(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(60+(ss-240)*1))), mPaint);
		}else if(ss<=300){
			canvas.drawLine(circleX,circleX,(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians((ss-270)*1))),(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(90-(ss-270)*1))),mPaint);
		}else if(ss<=330){
			canvas.drawLine(circleX,circleX,(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(30+(ss-300)*1))),(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(90-30-(ss-300)*1))),mPaint);
		}else if(ss<=360){
			canvas.drawLine(circleX,circleX,(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(60+(ss-330)*1))),(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(90-60-(ss-330)*1))),mPaint);
		}

7.分针转动： 

mPaint.setStrokeWidth(timeLineS_W);//设置分针宽度
		r=circleX-bordWidth;//还原
		r=r-timeLineB_H-50;//设置分针长度
		
		//分针随秒针转动
		if(mm<=5){
			canvas.drawLine(circleX,circleX,(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(90-mm*6))),(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(mm*6))), mPaint);
		}else if(mm<=10){
			canvas.drawLine(circleX,circleX,(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(90-30-(mm-5)*6))),(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(30+(mm-5)*6))), mPaint);
		}else if(mm<=15){
			canvas.drawLine(circleX,circleX,(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(90-60-(mm-10)*6))),(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(60+(mm-10)*6))), mPaint);
		}else if(mm<=20){
			canvas.drawLine(circleX,circleX,(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians((mm-15)*6))),(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(90-(mm-15)*6))), mPaint);
		}else if(mm<=25){
			canvas.drawLine(circleX,circleX,(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(30+(mm-20)*6))),(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(90-30-(mm-20)*6))), mPaint);
		}else if(mm<=30){
			canvas.drawLine(circleX,circleX,(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(60+(mm-25)*6))),(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(90-60-(mm-25)*6))), mPaint);
		}else if(mm<=35){
			canvas.drawLine(circleX,circleX,(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(90-(mm-30)*6))),(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians((mm-30)*6))), mPaint);
		}else if(mm<=40){
			canvas.drawLine(circleX,circleX,(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(90-30-(mm-35)*6))),(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(30+(mm-35)*6))), mPaint);
		}else if(mm<=45){
			canvas.drawLine(circleX,circleX,(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(90-60-(mm-40)*6))),(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(60+(mm-40)*6))), mPaint);
		}else if(mm<=50){
			canvas.drawLine(circleX,circleX,(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians((mm-45)*6))),(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(90-(mm-45)*6))),mPaint);
		}else if(mm<=55){
			canvas.drawLine(circleX,circleX,(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(30+(mm-50)*6))),(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(90-30-(mm-50)*6))),mPaint);
		}else if(mm<=60){
			canvas.drawLine(circleX,circleX,(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(60+(mm-55)*6))),(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(90-30-(mm-55)*6))),mPaint);
		}

8.时针转动： 

r=circleX-bordWidth;//还原
		r=r-timeLineB_H-120;//设置时针长度
		
		//时针随分针转动
		if(hh<=3){
			canvas.drawLine(circleX,circleX,(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(90-hh*30))),(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(hh*30))), mPaint);
		}else if(hh<=6){
			canvas.drawLine(circleX,circleX,(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians((hh-3)*30))),(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians(90-(hh-3)*30))), mPaint);
		}else if(hh<=9){
			canvas.drawLine(circleX,circleX,(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(90-(hh-6)*30))),(float)(circleX+(r-timeLineS_H)*Math.cos(Math.toRadians((hh-6)*30))), mPaint);
		}else if(hh<=12){
			canvas.drawLine(circleX,circleX,(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians((hh-9)*30))),(float)(circleX-(r-timeLineS_H)*Math.cos(Math.toRadians(90-(hh-9)*30))),mPaint);
		}

9.绘制刻度值： 

//写时刻数字
		mPaint.setTextSize(26);
		mPaint.setStrokeWidth(2);
		mPaint.setColor(bordColor);
		canvas.drawText("12", circleX-timeLineB_W, bordWidth+timeLineB_H+30, mPaint);
		canvas.drawText("1", (float)(circleX+(r-timeLineB_H)*Math.cos(Math.toRadians(60)))-20,(float)(circleX-(r-timeLineB_H)*Math.cos(Math.toRadians(30)))+20, mPaint);
		canvas.drawText("2", (float)(circleX+(r-timeLineB_H)*Math.cos(Math.toRadians(30)))-20,(float)(circleX-(r-timeLineB_H)*Math.cos(Math.toRadians(60)))+20, mPaint);
		canvas.drawText("3", getWidth()-bordWidth-timeLineB_H-20, circleX+10, mPaint);
		canvas.drawText("4",(float)(circleX+(r-timeLineB_H)*Math.cos(Math.toRadians(30)))-20,(float)(circleX+(r-timeLineB_H)*Math.cos(Math.toRadians(60))), mPaint);
		canvas.drawText("5", (float)(circleX+(r-timeLineB_H)*Math.cos(Math.toRadians(60)))-15,(float)(circleX+(r-timeLineB_H)*Math.cos(Math.toRadians(30)))-5, mPaint);
		canvas.drawText("6",circleX-10, getWidth()-bordWidth-timeLineB_H-10, mPaint);
		canvas.drawText("7", (float)(circleX-(r-timeLineB_H)*Math.cos(Math.toRadians(60))),(float)(circleX+(r-timeLineB_H)*Math.cos(Math.toRadians(30)))-10, mPaint);
		canvas.drawText("8",  (float)(circleX-(r-timeLineB_H)*Math.cos(Math.toRadians(30)))+10,(float)(circleX+(r-timeLineB_H)*Math.cos(Math.toRadians(60)))+5, mPaint);
		canvas.drawText("9", bordWidth+timeLineB_H+10, circleX+10, mPaint);
		canvas.drawText("10", (float)(circleX-(r-timeLineB_H)*Math.cos(Math.toRadians(30)))+10,(float)(circleX-(r-timeLineB_H)*Math.cos(Math.toRadians(60)))+20, mPaint);
		canvas.drawText("11", (float)(circleX-(r-timeLineB_H)*Math.cos(Math.toRadians(60))),(float)(circleX-(r-timeLineB_H)*Math.cos(Math.toRadians(30)))+25, mPaint);

在做的过程中会发现规律，就是每个大刻度（30度）即12点-1点，1点-2点......这之间所用的代码是相同的，只需要改变一下转动的角度值即可。秒针分为360，一次+6，转动一格为6度；分针分为60，在秒针到360时+1，转动一格为6度；时针分为12，在分针到60时+1，转动一格为30度；这也就是计算的时候有*1的，有*6的，有*30的原因，具体可以体会下代码中的算法，或者你有更好的算法欢迎分享出来！


demo下载地址：http://download.csdn.net/detail/baiyuliang2013/8668103


安卓自定义View实现钟表

标签：自定义view

原文地址：http://blog.csdn.net/baiyuliang2013/article/details/45535227
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