Android 实现抢购倒计时功能的示例

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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