Android 实现抢购倒计时功能的示例
作者：龙旋
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一、效果图
二、思路
算多少秒，秒数取余60，（满足分后剩下的秒数）
算多少分，秒数除60，再取余60 （总分数满足小时后剩下的分数）
算多少时，秒数除60，除60，再取余24 （总小时满足天后剩下的小时）
算多少天，秒数除60，除60，除24 等到的整数就是天数
三、实现步骤：
我们这里的时间格式为后台返回，格式为：
2021-12-24 00:00:00
1、时间转换的工具类
//将年-月-天 时：分：秒转化为毫秒格式
public static long residueTimeout(String endDate, String newDate) throws ParseException {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date d1 = df.parse(endDate);
Date d2 = df.parse(newDate);
long diff = d1.getTime() - d2.getTime();
return diff;
}
/*
* 将毫秒转换成时间戳
*/
public static String stampToDate(Long s) {
String res;
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date date = new Date(s);
res = simpleDateFormat.format(date);
return res;
}
2、时间倒计时工具类
package com.sjl.keeplive.huawei;
import android.os.CountDownTimer;
/**
* 倒计时工具类
*/
public class CountDownTimerUtils {
/**
* 倒计时结束的回调接口
*/
public interface FinishDelegate {
void onFinish();
}
/**
* 定期回调的接口
*/
public interface TickDelegate {
void onTick(long pMillisUntilFinished);
}
private final static long ONE_SECOND = 1000;
/**
* 总倒计时时间
*/
private long mMillisInFuture = 0;
/**
* 定期回调的时间 必须大于0 否则会出现ANR
*/
private long mCountDownInterval;
/**
* 倒计时结束的回调
*/
private FinishDelegate mFinishDelegate;
/**
* 定期回调
*/
private TickDelegate mTickDelegate;
private MyCountDownTimer mCountDownTimer;
/**
* 获取 CountDownTimerUtils
*
* @return CountDownTimerUtils
*/
public static CountDownTimerUtils getCountDownTimer() {
return new CountDownTimerUtils();
}
/**
* 设置定期回调的时间 调用{@link #setTickDelegate(TickDelegate)}
*
* @param pCountDownInterval 定期回调的时间 必须大于0
* @return CountDownTimerUtils
*/
public CountDownTimerUtils setCountDownInterval(long pCountDownInterval) {
this.mCountDownInterval = pCountDownInterval;
return this;
}
/**
* 设置倒计时结束的回调
*
* @param pFinishDelegate 倒计时结束的回调接口
* @return CountDownTimerUtils
*/
public CountDownTimerUtils setFinishDelegate(FinishDelegate pFinishDelegate) {
this.mFinishDelegate = pFinishDelegate;
return this;
}
/**
* 设置总倒计时时间
*
* @param pMillisInFuture 总倒计时时间
* @return CountDownTimerUtils
*/
public CountDownTimerUtils setMillisInFuture(long pMillisInFuture) {
this.mMillisInFuture = pMillisInFuture;
return this;
}
/**
* 设置定期回调
*
* @param pTickDelegate 定期回调接口
* @return CountDownTimerUtils
*/
public CountDownTimerUtils setTickDelegate(TickDelegate pTickDelegate) {
this.mTickDelegate = pTickDelegate;
return this;
}
public void create() {
if (mCountDownTimer != null) {
mCountDownTimer.cancel();
mCountDownTimer = null;
}
if (mCountDownInterval <= 0) {
mCountDownInterval = mMillisInFuture + ONE_SECOND;
}
mCountDownTimer = new MyCountDownTimer(mMillisInFuture, mCountDownInterval);
mCountDownTimer.setTickDelegate(mTickDelegate);
mCountDownTimer.setFinishDelegate(mFinishDelegate);
}
/**
* 开始倒计时
*/
public void start() {
if (mCountDownTimer == null) {
create();
}
mCountDownTimer.start();
}
/**
* 取消倒计时
*/
public void cancel() {
if (mCountDownTimer != null) {
mCountDownTimer.cancel();
}
}
private static class MyCountDownTimer extends CountDownTimer {
private FinishDelegate mFinishDelegate;
private TickDelegate mTickDelegate;
/**
* @param millisInFuture The number of millis in the future from the call
* to {@link #start()} until the countdown is done and {@link #onFinish()}
* is called.
* @param countDownInterval The interval along the way to receive
* {@link #onTick(long)} callbacks.
*/
public MyCountDownTimer(long millisInFuture, long countDownInterval) {
super(millisInFuture, countDownInterval);
}
@Override
public void onTick(long millisUntilFinished) {
if (mTickDelegate != null) {
mTickDelegate.onTick(millisUntilFinished);
}
}
@Override
public void onFinish() {
if (mFinishDelegate != null) {
mFinishDelegate.onFinish();
}
}
void setFinishDelegate(FinishDelegate pFinishDelegate) {
this.mFinishDelegate = pFinishDelegate;
}
void setTickDelegate(TickDelegate pTickDelegate) {
this.mTickDelegate = pTickDelegate;
}
}
}
3、布局文件
<LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:orientation="horizontal"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="抢购倒计时：" /> <TextView android:id="@+id/text_day" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="#ff0000" android:padding="5dp" android:text="00" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text=" 天 " /> <TextView android:id="@+id/text_hour" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="#ff0000" android:padding="5dp" android:text="00" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text=" 时 " /> <TextView android:id="@+id/text_minute" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="#ff0000" android:padding="5dp" android:text="00" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text=" 分 " /> <TextView android:id="@+id/text_second" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="#ff0000" android:padding="5dp" android:text="00" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text=" 秒 " /> </LinearLayout>
4、倒计时显示处理
public static void liveDescCountTime(long ms, TextView tvDays, TextView tvHour, TextView tvMinutes, TextView tvSeconds) {
long totalSeconds = ms / 1000;
long seconds = totalSeconds % 60;
long minutes = totalSeconds / 60 % 60;
long hours = totalSeconds / 60 / 60 % 24;
long days = totalSeconds / 60 / 60 / 24;
String dayStr = "";
if (days > 0) {
if (days > 9) {
dayStr += days + "";
} else if (days > 0) {
dayStr += "0" + days + "";
} else {
dayStr += "00";
}
} else {
dayStr = "00";
}
tvDays.setText(dayStr);
String hourStr = "";
if (hours > 0) {
if (hours > 9) {
hourStr += hours + "";
} else if (hours > 0) {
hourStr += "0" + hours + "";
} else {
hourStr += "00";
}
} else {
hourStr = "00";
}
tvHour.setText(hourStr);
String minutesStr = "";
if (minutes > 0) {
if (minutes > 9) {
minutesStr += minutes + "";
} else if (minutes > 0) {
minutesStr += "0" + minutes + "";
} else {
minutesStr += "00";
}
} else {
minutesStr = "00";
}
tvMinutes.setText(minutesStr);
String secondStr = "";
if (minutes > 0) {
if (seconds > 9) {
secondStr += seconds;
} else if (seconds > 0) {
secondStr += "0" + seconds;
} else {
secondStr += "00";
}
} else {
secondStr = "00";
}
tvSeconds.setText(secondStr);
}
5、开始倒计时
final TextView text_day = findViewById(R.id.text_day);
final TextView text_hour = findViewById(R.id.text_hour);
final TextView text_minute = findViewById(R.id.text_minute);
final TextView text_second = findViewById(R.id.text_second);
long residueTime = 0;
//获取当前时间
String stampToDate = stampToDate(System.currentTimeMillis());
try {
//2021-12-24 00:00:00为模拟倒计时间数据
residueTime = residueTimeout("2021-12-24 00:00:00", stampToDate);
} catch (ParseException e) {
e.printStackTrace();
}
//倒计时
CountDownTimerUtils.getCountDownTimer()
.setMillisInFuture(residueTime)
.setCountDownInterval(1000)
.setTickDelegate(new CountDownTimerUtils.TickDelegate() {
@Override
public void onTick(long pMillisUntilFinished) {
liveDescCountTime(pMillisUntilFinished, text_day, text_hour, text_minute, text_second);
}
})
.setFinishDelegate(new CountDownTimerUtils.FinishDelegate() {
@Override
public void onFinish() {
//倒计时完成后处理
}
}).start();
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