算多少秒，秒數取余60，（滿足分后剩下的秒數）算多少分，秒數除60，再取余60 （總分數滿足小時后剩下的分數）算多少時，秒數除60，除60，再取余24 （總小時滿足天后剩下的小時）算多少天，秒數除60，除60，除24 等到的整數就是天數

我們這里的時間格式為后臺返回，格式為：

2021-12-24 00:00:001、時間轉換的工具類

//將年-月-天 時：分：秒轉化為毫秒格式 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; } /* * 將毫秒轉換成時間戳 */ 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、時間倒計時工具類

package com.sjl.keeplive.huawei;import android.os.CountDownTimer;/** * 倒計時工具類 */public class CountDownTimerUtils { /** * 倒計時結束的回調接口 */ public interface FinishDelegate { void onFinish(); } /** * 定期回調的接口 */ public interface TickDelegate { void onTick(long pMillisUntilFinished); } private final static long ONE_SECOND = 1000; /** * 總倒計時時間 */ private long mMillisInFuture = 0; /** * 定期回調的時間 必須大于0 否則會出現ANR */ private long mCountDownInterval; /** * 倒計時結束的回調 */ private FinishDelegate mFinishDelegate; /** * 定期回調 */ private TickDelegate mTickDelegate; private MyCountDownTimer mCountDownTimer; /** * 獲取 CountDownTimerUtils * * @return CountDownTimerUtils */ public static CountDownTimerUtils getCountDownTimer() { return new CountDownTimerUtils(); } /** * 設置定期回調的時間 調用{@link #setTickDelegate(TickDelegate)} * * @param pCountDownInterval 定期回調的時間 必須大于0 * @return CountDownTimerUtils */ public CountDownTimerUtils setCountDownInterval(long pCountDownInterval) { this.mCountDownInterval = pCountDownInterval; return this; } /** * 設置倒計時結束的回調 * * @param pFinishDelegate 倒計時結束的回調接口 * @return CountDownTimerUtils */ public CountDownTimerUtils setFinishDelegate(FinishDelegate pFinishDelegate) { this.mFinishDelegate = pFinishDelegate; return this; } /** * 設置總倒計時時間 * * @param pMillisInFuture 總倒計時時間 * @return CountDownTimerUtils */ public CountDownTimerUtils setMillisInFuture(long pMillisInFuture) { this.mMillisInFuture = pMillisInFuture; return this; } /** * 設置定期回調 * * @param pTickDelegate 定期回調接口 * @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); } /** * 開始倒計時 */ public void start() { if (mCountDownTimer == null) { create(); } mCountDownTimer.start(); } /** * 取消倒計時 */ 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='搶購倒計時：' /> <TextView android: 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: 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=' 時 ' /> <TextView android: 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: 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、倒計時顯示處理

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、開始倒計時

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;//獲取當前時間 String stampToDate = stampToDate(System.currentTimeMillis()); try { //2021-12-24 00:00:00為模擬倒計時間數據 residueTime = residueTimeout('2021-12-24 00:00:00', stampToDate); } catch (ParseException e) { e.printStackTrace(); }//倒計時 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() { //倒計時完成后處理 } }).start();

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