android系统时间显示计时00：00：00

package com.example.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.TextView;

public class MainActivity extends Activity {
private int recLen = 0;
private TextView textView1;
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView1 = (TextView)findViewById(R.id.textView1);
handler.postDelayed(runnable, 1000);
}
Handler handler = new Handler();
Runnable runnable = new Runnable() {
@Override
public void run() {
recLen++;
textView1.setText("" + timeCalculate(recLen));
handler.postDelayed(this, 1000);
}
};
public String timeCalculate(long ttime)
{
long daysuuu,hoursuuu, minutesuuu, secondsuuu;
String daysT = "", restT = "";
daysuuu = (Math.round(ttime) / 86400);
hoursuuu = (Math.round(ttime) / 3600) - (daysuuu * 24);
minutesuuu = (Math.round(ttime) / 60) - (daysuuu * 1440) - (hoursuuu * 60);
secondsuuu = Math.round(ttime) % 60;
if(daysuuu==1) daysT = String.format("%d day ", daysuuu);
if(daysuuu>1) daysT = String.format("%d days ", daysuuu);
restT = String.format("%02d:%02d:%02d", hoursuuu, minutesuuu, secondsuuu);
return daysT + restT;
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
handler.removeCallbacks(runnable);
return true;
}
return super.onOptionsItemSelected(item);
}
}

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