Android 使用CountDownTimer实现倒计时的功能

“`package com.alex.countdowntimer;

import java.text.SimpleDateFormat;
import java.util.Date;

import android.app.Activity;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.widget.TextView;

public class MainActivity extends Activity {
private TextView tv;
private MyCount mc;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv = (TextView)findViewById(R.id.show);
mc = new MyCount(60000, 1000);
mc.start();
}

class MyCount extends CountDownTimer{      public MyCount(long millisInFuture, long countDownInterval) {          super(millisInFuture, countDownInterval);          System.out.println("Hello");      }      @Override      public void onTick(long millisUntilFinished) {          Date date = new Date(millisUntilFinished);          SimpleDateFormat sdf = new SimpleDateFormat("hh:mm:ss");          String str = sdf.format(date);          System.out.println(str);          tv.setText("请等待"+millisUntilFinished / 1000 +"秒");      }      @Override      public void onFinish() {          tv.setText("finish");      }  }  @Overrideprotected void onDestroy() {    // TODO Auto-generated method stub    super.onDestroy();    mc.cancel();}

}
第一个参数表示总时间，第二个参数表示间隔时间。意思就是每隔一秒会回调一次方法onTick，然后10秒之后会回调onFinish方法。