android计时demo源代码

这是个android计时的代码，保存着方便以后工作中用到。

public class MainActivity extends Activity {private TextView tv;private static long start,now;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);tv = (TextView) findViewById(R.id.tvTime);start = System.currentTimeMillis();handle.post(runnable);}public String showTimeCount(long time) {if(time >= 360000000){return "00:00:00";}String timeCount = "";long hourc = time/3600000;String hour = "0" + hourc;hour = hour.substring(hour.length()-2, hour.length());long minuec = (time-hourc*3600000)/(60000);String minue = "0" + minuec;minue = minue.substring(minue.length()-2, minue.length());long secc = (time-hourc*3600000-minuec*60000)/1000;String sec = "0" + secc;sec = sec.substring(sec.length()-2, sec.length());timeCount = hour + ":" + minue + ":" + sec;return timeCount;}Handler handle = new Handler();Runnable runnable = new Runnable() {@Overridepublic void run() {handle.postDelayed(this, 500);now = System.currentTimeMillis();long time = now - start;tv.setText(showTimeCount(time));Log.i("0630","handle -- running");}};}