2019独角兽企业重金招聘Python工程师标准>>> 
package com.love.timers;
import java.text.DateFormat;
import java.text.Format;
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.View;
import android.widget.TextView;
public class MainActivity extends Activity
{
private int recLen = 100;
private TextView time;
private Timer timer;
@Override
protected void onCreate(Bundle savedInstanceState)
{
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
this.setContentView(R.layout.activity_main);
time = (TextView) this.findViewById(R.id.timer);
DateFormat format = new SimpleDateFormat("HH:mm:ss");
time.setText(format.format(new Date()));
timer = new Timer();
timer.schedule(task, 1000, 1000); // timeTask
}
final Handler handler = new Handler(){
@Override
public void handleMessage(Message msg){
switch (msg.what) {
case 1:
Bundle b = msg.getData();
String date = b.getString("date");
time.setText(date);
if(recLen < 0){
timer.cancel();
time.setVisibility(View.GONE);
}
}
}
};
TimerTask task = new TimerTask() {
@Override
public void run() {
recLen--;
Message message = new Message();
message.what = 1;
Bundle b = new Bundle();
DateFormat format = new SimpleDateFormat("HH:mm:ss");
b.putString("date", format.format(new Date()));
message.setData(b);
handler.sendMessage(message);
}
};
}