Android中在控件上显示倒计时

public class CountdownTimerActivity extends Activity {
private TimeCount time;
private Button checking;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
time = new TimeCount(60000, 1000);//构造CountDownTimer对象
checking = (Button) findViewById(R.id.button1);
checking.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
time.start();//开始计时
}
});
}
/* 定义一个倒计时的内部类 */
class TimeCount extends CountDownTimer {
public TimeCount(long millisInFuture, long countDownInterval) {
super(millisInFuture, countDownInterval);//参数依次为总时长,和计时的时间间隔
}
@Override
public void onFinish() {//计时完毕时触发
checking.setText("重新验证");
checking.setClickable(true);
}
@Override
public void onTick(long millisUntilFinished){//计时过程显示
checking.setClickable(false);
checking.setText(millisUntilFinished /1000+"秒");
}
}