倒计时显示时间，显示毫秒

源码里显示的是从5秒000毫秒减到0秒000毫秒，具体看上传的代码，不懂的可以留言！

package com.example.timedemo;import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.SimpleAdapter;
import android.widget.TextView;public class MainActivity extends Activity {TextView tvTime;long firstTime;Timer timer = new Timer();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);tvTime = (TextView) findViewById(R.id.tv_time);firstTime = System.currentTimeMillis();timer.schedule(timerTask, 0, 100);}TimerTask timerTask = new TimerTask() {@Overridepublic void run() {handler.sendEmptyMessage(0x01);}};Handler handler = new Handler() {SimpleDateFormat sdf = new SimpleDateFormat("mm:ss:SSS");@Overridepublic void handleMessage(Message msg) {switch (msg.what) {case 0x01:long curTime = System.currentTimeMillis();if (firstTime + 5000 - curTime >= 0.00) {String timeStr = sdf.format(new Date(firstTime + 5000- curTime));tvTime.setText(timeStr);}else{tvTime.setText("00:00:000");if(timer != null){timer.cancel();}}break;}}};
}

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