Android倒计时电子钟的实现(下篇)

本篇继续上篇未完成的部分，这篇文章会实现动态效果如图所示

在程序中先给定一个截止时间：

2014-12-20 00:00:00

然后计算当期时间和截止时间相差的时间

	private long getCurrentShowTimeSeconds() {
		Date curTime = new Date();
	    long ret = endDate.getTime() - curTime.getTime();
	    ret =Math.round( ret/1000 );

	    return ret >= 0 ? ret : 0;
	}

然后在线程中添加循环，并间隔50ms刷新一次。

具体代码如下

/**
 * CountDownView.java
 * Copyright(C) 2014
 * creator:cuiran 2014-12-19 下午2:18:59
 */
package com.cayden.countdown.view;

import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;

import com.cayden.countdown.Constants;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;

/**
 * 倒计时View
 * @author cuiran
 * @version 1.0.0
 */
public class CountDownView extends SurfaceView implements Runnable, Callback,Constants {
	private static final String TAG="CountDownView";
	private SurfaceHolder mHolder;    //用于控制SurfaceView
	private Canvas mCanvas;    //声明画布
	private Paint mPaint;    //声明画笔

    private Thread mThread;    //声明一个线程

    private static final int RADIUS=10;	//声明小球半径
    private static final int MARGIN_TOP = 60;
    private static final int MARGIN_LEFT = 30;
    private ArrayList<int[][]> list=new ArrayList<int[][]>();

    private static final String END="2014-12-20 00:00:00";
    private Date endDate=null;
    private long curShowTimeSeconds=0;
	public CountDownView(Context context) {
		super(context);
		  mHolder = this.getHolder();    	//获得SurfaceHolder对象
	      mHolder.addCallback(this);    	//添加状态监听
	      mPaint = new Paint();    			//创建一个画笔对象
	      mPaint.setColor(Color.BLUE);   	//设置画笔的颜色

	}

	private long getCurrentShowTimeSeconds() {
		Date curTime = new Date();
	    long ret = endDate.getTime() - curTime.getTime();
	    ret =Math.round( ret/1000 );

	    return ret >= 0 ? ret : 0;
	}
	@Override
	public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {

	}

	@Override
	public void surfaceCreated(SurfaceHolder arg0) {
		  mThread = new Thread(this);    //创建线程对象

		  mThread.start();
	}

	@Override
	public void surfaceDestroyed(SurfaceHolder arg0) {

	}
	@SuppressLint("SimpleDateFormat")
	public  Date strToDateLong(String strDate)
	{
		if("".equals(strDate)||null==strDate){
			return null;
		}
		SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		ParsePosition pos = new ParsePosition(0);
		Date strtodate = formatter.parse(strDate, pos);
		return strtodate;
	}
	@Override
	public void run() {
		try{

		      list.add(data0);
		      list.add(data1);
		      list.add(data2);
		      list.add(data3);
		      list.add(data4);
		      list.add(data5);
		      list.add(data6);
		      list.add(data7);
		      list.add(data8);
		      list.add(data9);
		      list.add(data10);
		      endDate=strToDateLong(END);
		      while(true){
		    	  curShowTimeSeconds=getCurrentShowTimeSeconds();
			      mDraw();
		    	  Thread.sleep(50);
		      }

		}catch(Exception e){
			Log.e(TAG,"run error",e);
		}

	}

	/**
	 * 自定义绘图方法
	 * 2014-12-19 下午2:22:45
	 *
	 */
	public void mDraw() {
		 mCanvas = mHolder.lockCanvas();   			 //获得画布对象,开始对画布画画
		 mCanvas.drawColor(Color.BLACK);    		 //设置画布颜色为黑色
		 canvas(mCanvas);
		 mHolder.unlockCanvasAndPost(mCanvas);       //把画布显示在屏幕上
	}

	public void canvas(Canvas mCanvas) {
		//画圆,(x轴,y轴,半径,画笔)

        int hours=(int)curShowTimeSeconds / 3600;
        int minutes=(int)(curShowTimeSeconds - hours * 3600)/60 ;
        int seconds=(int)curShowTimeSeconds % 60;

        canvasDigit( MARGIN_LEFT , MARGIN_TOP , 	hours/10 , mCanvas );
        canvasDigit( MARGIN_LEFT + 15*(RADIUS+1) , MARGIN_TOP , hours%10 , mCanvas );
        canvasDigit( MARGIN_LEFT + 30*(RADIUS + 1) , MARGIN_TOP , 10 , mCanvas );
        canvasDigit( MARGIN_LEFT + 39*(RADIUS+1) , MARGIN_TOP , minutes/10 , mCanvas);
        canvasDigit( MARGIN_LEFT + 54*(RADIUS+1) , MARGIN_TOP , minutes%10 , mCanvas);
        canvasDigit( MARGIN_LEFT + 69*(RADIUS+1) , MARGIN_TOP , 10 , mCanvas);
        canvasDigit( MARGIN_LEFT + 78*(RADIUS+1) , MARGIN_TOP , seconds/10 , mCanvas);
        canvasDigit( MARGIN_LEFT + 93*(RADIUS+1) , MARGIN_TOP , seconds%10 , mCanvas);
	}

	public void canvasDigit(int x,int y,int num,Canvas mCanvas) {
		int [][] data=list.get(num);
		for(int i=0;i<data.length;i++){

			for(int j=0;j<data[i].length;j++){

				if(data[i][j]==1){

					mCanvas.drawCircle(x + j*2*(RADIUS+1)+(RADIUS+1), y + i*2*(RADIUS+1)+(RADIUS+1), RADIUS, mPaint);

				}

			}

		}
	}

}

需要详细代码可以访问 具体优化部分暂时还没有处理。

github地址：https://github.com/cayden/CountDown