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   源码介绍

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package com.example.onclick;

import java.util.Calendar;

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RectF;
import android.os.Bundle;
import android.os.Handler;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;

public class MainActivity extends Activity {

	 private Paint mPaint;
	    private float mCenterX;

	    private float mHourLength;
	    private float mMinuteLength;
	    private float mSecondLength;
	    private Handler handler = new Handler();
	    @Override
	    protected void onCreate(Bundle savedInstanceState) {
	        super.onCreate(savedInstanceState);
	        setContentView(new CustomView1(MainActivity.this));
	    }



	    class CustomView1 extends View implements Runnable{

	        Paint paint;

	        public CustomView1(Context context) {
	            super(context);
	            paint = new Paint(); //设置一个笔刷大小是3的黄色的画笔
	            paint.setColor(Color.RED);
	            handler.postDelayed(this, 1000);
	        }

	        //在这里我们将测试canvas提供的绘制图形方法
	        @Override
	        protected void onDraw(Canvas canvas) {

	            paint.setStrokeWidth(5);
	            paint.setStyle(Paint.Style.STROKE);
	            paint.setAntiAlias(true);
	            paint.setStyle(Paint.Style.STROKE);
	            //将要画的位置移动到屏幕中间
	            canvas.translate(canvas.getWidth()/2, canvas.getHeight()/2);
	            //将位置移动画纸的坐标点:150,150
	            //以半径为150和180画圆
	            canvas.drawCircle(0, 0, 150, paint);
	            canvas.drawCircle(0, 0, 180, paint);
	            //使用path绘制路径文字
	            canvas.save();
	            //移动绘制文字的位置
	            canvas.translate(0, 0);
	            Path path = new Path();
	            //绘制的时候要注意左上不能大于右下，否则不会显示
	            RectF rect = new RectF(-100,-100,100,100);
	            path.addArc(rect, -220, 280);
	            Paint citePaint = new Paint(paint);
	            citePaint.setTextSize(28);
	            //设置画笔的粗细
	            citePaint.setStrokeWidth(3);
	            //float hOffset, float vOffset// 设置水平位置  vOffset  设置垂直位置
	            // 如果hOffset为0 说明开始位置在path.addArc设置的startAngle开始角度
	            // 如果vOffset 为0说明经过的位置是在与RectF的顶部相切处
//	            canvas.drawTextOnPath("http://blog.csdn.net/u014452224", path, 14, 0, citePaint);
	            //为了方便一些转换操作，Canvas 还提供了保存和回滚属性的方法(save和restore)，
	            // 比如你可以先保存目前画纸的位置(save)，
	            // 然后旋转90度，向下移动100像素后画一些图形，画完后调用restore方法返回到刚才保存的位置
	            canvas.restore();

	            Paint smallPaint = new Paint(paint); //非数字刻度画笔对象
	            smallPaint.setStrokeWidth(2);
	            smallPaint.setColor(Color.GRAY);
	            float  y=150;
	            int count = 60; //总刻度数
	            Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
	            paint.setStrokeWidth(6);
	            paint.setColor(Color.RED);
	            paint.setTextSize(24);
	            paint.setStrokeWidth(3);


	            for(int i=0 ; i <count ; i  ){
	                if(i%5 == 0){
	                    //绘制数字刻度
	                    canvas.drawText(i == 0 ? "12" : String.valueOf(i / 5),((i / 5)>9||i==0)?-15f:-6f , -y-5f, paint);
	                }else{
	                    //绘制非数字的刻度
	                    canvas.drawLine(0f, y, 0f, y  15f, smallPaint);
	                }
	                canvas.rotate(360/count,0f,0f); //旋转画纸
	            }
	            Calendar calendar = Calendar.getInstance();
	            int currentMinute = calendar.get(Calendar.MINUTE);
	            int currentHour = calendar.get(Calendar.HOUR);
	            int currentSecond = calendar.get(Calendar.SECOND);
	            // 计算分针和时间的角度
	            double secondRadian = Math.toRadians((360 - ((currentSecond * 6) - 90)) % 360);
	            double minuteRadian = Math.toRadians((360 - ((currentMinute * 6) - 90)) % 360);
	            double hourRadian = Math.toRadians((360 - ((currentHour * 30) - 90))% 360 - (30 * currentMinute / 60));
	            // 设置实针为6个象素粗
	            paint.setStrokeWidth(6);
	            // 在表盘上画时针
	            mCenterX = 0;
	            mHourLength = 100;
	            canvas.drawLine(mCenterX, mCenterX,
	                    (int) (mCenterX   mHourLength * Math.cos(hourRadian)),
	                    (int) (mCenterX - mHourLength * Math.sin(hourRadian)), paint);

	            // 设置分针为4个象素粗
	            paint.setStrokeWidth(4);
	            mMinuteLength = 120;
	            // 在表盘上画分针
	            canvas.drawLine(mCenterX, mCenterX,
	                    (int) (mCenterX   mMinuteLength* Math.cos(minuteRadian)),
	                    (int) (mCenterX - mMinuteLength* Math.sin(minuteRadian)),
	                    paint);
	            // 设置分针为2个象素粗
	            paint.setStrokeWidth(2);
	            // 在表盘上画秒针
	            mSecondLength = 145;
	            int centerY = 30;
	            canvas.drawLine((int) (mCenterX - centerY* Math.cos(secondRadian)),(int) (mCenterX   centerY* Math.sin(secondRadian)),
	                    (int) (mCenterX   mSecondLength* Math.cos(secondRadian)),
	                    (int) (mCenterX - mSecondLength* Math.sin(secondRadian)),
	                    paint);
	            paint.setStyle(Paint.Style.FILL);
	            canvas.drawCircle(0, 0, 5, paint);




	    }
	        @Override
	        public void run() {
	            // 重新绘制View
	            this.invalidate();
	            // 重新设置定时器，在60秒后调用run方法
	            handler.postDelayed(this, 1000);
	        }
	    }
}