Android中用Handle做定时器，显示实时时间

...

mTimeTv = new TextView(this);
SimpleDateFormat df = new SimpleDateFormat("HH:mm:ss");
String date = df.format(new java.util.Date());
mTimeTv.setText(date);
mTimeTv.setTextSize(35);
mTimeTv.setTextColor(Color.BLACK);

timeHandler.postDelayed(updateTimeThread, 1000);
}

Handler timeHandler = new Handler();
Runnable updateTimeThread = new Runnable() {

public void run() {
// TODO Auto-generated method stub
SimpleDateFormat df = new SimpleDateFormat("HH:mm:ss");
String date = df.format(new java.util.Date());
mTimeTv.setText(date);
timeHandler.postDelayed(updateTimeThread, 1000);
}
};