新的商品详情，对特卖要增加倒计时的功能：

采用了android系统的CountDownTimer这个类

关于这个类的用法：

* Schedule a countdown until a time in the future, with

* regular notifications on intervals along the way.

*

* Example of showing a 30 second countdown in a text field:

*

*

* new CountDownTimer(30000, 1000) {

*

*     public void onTick(long millisUntilFinished) {

*         mTextField.setText("seconds remaining: " + millisUntilFinished / 1000);

*     }

*

*     public void onFinish() {

*         mTextField.setText("done!");

*     }

*  }.start();

在时间工具类中加了两个方法：

/**

* 获得倒计时的时间间隔

*

* @param dateStr

* @return

*/

public static long getCountdownInterval(String dateStr) {

long interval = 0;

if (StringUtils.isBlank(dateStr)) {

return interval;

}

Date countdownDate = new Date();

try {

countdownDate = DB_DATE_FORMAT.parse(dateStr);

} catch (ParseException e) {

LogUtils.loge("DateUtils", "日期格式有问题");

}

Date now = new Date();

interval = countdownDate.getTime() - now.getTime();

if (interval < 0)

return 0;

return interval;

}

/**

* @param createTime

* @return 返回离当前时刻的时间间隔，以中文形式描述

*/

public static int[] getCountdownIntervalDetails(long intervalSec) {

int[] countdownIntervalDetals = new int[4];

intervalSec = intervalSec / 1000;// 先转成秒

// 天

int day = (int) (intervalSec / (24 * 3600));

countdownIntervalDetals[0] = day;

intervalSec = intervalSec - day * (24 * 3600);

// 时

int hour = (int) (intervalSec / 3600);

countdownIntervalDetals[1] = hour;

intervalSec = intervalSec - hour * 3600;

// 分

int min = (int) (intervalSec / 60);

countdownIntervalDetals[2] = min;

intervalSec = intervalSec - min * 60;

countdownIntervalDetals[3] = (int) intervalSec;

return countdownIntervalDetals;

}

最后，组装成一个控件：

/**

* 倒计时控件

*/

public class L_CountdownBlock implements Y_UIBlock {

private Context mContext;

private View container;

private CountDownTimer cdt;

private TextView tv_countdown_day;

private TextView tv_countdown_hour;

private TextView tv_countdown_min;

private TextView tv_countdown_sec;

protected int[] intervalDetails;

public L_CountdownBlock(View view) {

this.container = view;

this.mContext = container.getContext();

}

/**

* 设置结束时间

*

* @param dateStr

*/

private void setDate(String dateStr) {

long interval = DateUtils.getCountdownInterval(dateStr);

cdt = new CountDownTimer(interval, 1000) {

@Override

public void onTick(long millisUntilFinished) {

intervalDetails = DateUtils

.getCountdownIntervalDetails(millisUntilFinished);

tv_countdown_day.setText(intervalDetails[0] + "");

tv_countdown_hour.setText(intervalDetails[1] + "");

tv_countdown_min.setText(intervalDetails[2] + "");

tv_countdown_sec.setText(intervalDetails[3] + "");

}

@Override

public void onFinish() {

//TODO 加了倒计时结束的逻辑

}

};

cdt.start();

}

/**

* 取消倒计时

*/

private void cancelCountdown() {

if (null != cdt) {

cdt.cancel();

}

}

@Override

public void update(T t) {

tv_countdown_day = (TextView) container

.findViewById(R.id.tv_countdown_day);

tv_countdown_hour = (TextView) container

.findViewById(R.id.tv_countdown_hour);

tv_countdown_min = (TextView) container

.findViewById(R.id.tv_countdown_min);

tv_countdown_sec = (TextView) container

.findViewById(R.id.tv_countdown_sec);

setDate((String) t);

}

@Override

public View getContentView() {

return container;

}

}