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这篇CFSDN的博客文章android实现倒计时功能代码由作者收集整理，如果你对这篇文章有兴趣，记得点赞哟.

效果图，每隔1秒，变换一下时间   xml

复制代码 代码如下

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" android:background="#000000" > <com.gettime.CustomDigitalClock android:id="@+id/time" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_gravity="center" android:gravity="center" android:textColor="#FF0000" android:textSize="45sp" /> </RelativeLayout> //上面 <com.gettime.CustomDigitalClock 为类的完整位置 MainActivity.java package com.gettime; import android.os.Bundle; import android.app.Activity; public class MainActivity extends Activity { private CustomDigitalClock timeClock; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); timeClock=(CustomDigitalClock) findViewById(R.id.time); timeClock.setEndTime(System.currentTimeMillis()+30*1000*24*24); } } CustomDigitalClock.java /* * Copyright (C) 2012 The * Project * All right reserved. * Version 1.00 2012-2-11 * Author veally@foxmail.com */ package com.gettime; import java.util.Calendar; import android.content.Context; import android.database.ContentObserver; import android.os.Handler; import android.os.SystemClock; import android.provider.Settings; import android.text.Html; import android.text.Spannable; import android.text.Spanned; import android.text.style.AbsoluteSizeSpan; import android.util.AttributeSet; import android.widget.DigitalClock; /** * Custom digital clock * * @author veally@foxmail.com */ public class CustomDigitalClock extends DigitalClock { Calendar mCalendar; private final static String m12 = "h:mm aa"; private final static String m24 = "k:mm"; private FormatChangeObserver mFormatChangeObserver; private Runnable mTicker; private Handler mHandler; private long endTime; public static long distanceTime; private ClockListener mClockListener; private static boolean isFirst; private boolean mTickerStopped; @SuppressWarnings("unused") private String mFormat; public CustomDigitalClock(Context context) { super(context); initClock(context); } public CustomDigitalClock(Context context, AttributeSet attrs) { super(context, attrs); initClock(context); } private void initClock(Context context) { if (mCalendar == null) { mCalendar = Calendar.getInstance(); } mFormatChangeObserver = new FormatChangeObserver(); getContext().getContentResolver().registerContentObserver( Settings.System.CONTENT_URI, true, mFormatChangeObserver); setFormat(); } @Override protected void onAttachedToWindow() { mTickerStopped = false; super.onAttachedToWindow(); mHandler = new Handler(); /** * requests a tick on the next hard-second boundary */ mTicker = new Runnable() { public void run() { if (mTickerStopped) return; long currentTime = System.currentTimeMillis(); if (currentTime / 1000 == endTime / 1000 - 5 * 60) { mClockListener.remainFiveMinutes(); } distanceTime = endTime - currentTime; distanceTime /= 1000; if (distanceTime == 0) { setText("00:00:00"); onDetachedFromWindow(); } else if (distanceTime < 0) { setText("00:00:00"); onDetachedFromWindow(); } else { setText(dealTime(distanceTime)); } invalidate(); long now = SystemClock.uptimeMillis(); long next = now + (1000 - now % 1000); mHandler.postAtTime(mTicker, next); } }; mTicker.run(); } /** * deal time string * * @param time * @return */ public static Spanned dealTime(long time) { Spanned str; StringBuffer returnString = new StringBuffer(); long day = time / (24 * 60 * 60); long hours = (time % (24 * 60 * 60)) / (60 * 60); long minutes = ((time % (24 * 60 * 60)) % (60 * 60)) / 60; long second = ((time % (24 * 60 * 60)) % (60 * 60)) % 60; String dayStr = String.valueOf(day); String hoursStr = timeStrFormat(String.valueOf(hours)); String minutesStr = timeStrFormat(String.valueOf(minutes)); String secondStr = timeStrFormat(String.valueOf(second)); returnString.append(dayStr).append("天").append(hoursStr).append("小时") .append(minutesStr).append("分钟").append(secondStr).append("秒"); str = Html.fromHtml(returnString.toString()); if (day >= 10) { ((Spannable) str).setSpan(new AbsoluteSizeSpan(16), 2, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); ((Spannable) str).setSpan(new AbsoluteSizeSpan(16), 5, 7, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); ((Spannable) str).setSpan(new AbsoluteSizeSpan(16), 9, 11, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); ((Spannable) str).setSpan(new AbsoluteSizeSpan(16), 13, 14, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); } else { ((Spannable) str).setSpan(new AbsoluteSizeSpan(16), 1, 2, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); ((Spannable) str).setSpan(new AbsoluteSizeSpan(16), 4, 6, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); ((Spannable) str).setSpan(new AbsoluteSizeSpan(16), 8, 10, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); ((Spannable) str).setSpan(new AbsoluteSizeSpan(16), 12, 13, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); } // return returnString.toString(); return str; } /** * format time * * @param timeStr * @return */ private static String timeStrFormat(String timeStr) { switch (timeStr.length()) { case 1: timeStr = "0" + timeStr; break; } return timeStr; } @Override protected void onDetachedFromWindow() { super.onDetachedFromWindow(); mTickerStopped = true; } /** * Clock end time from now on. * * @param endTime */ public void setEndTime(long endTime) { this.endTime = endTime; } /** * Pulls 12/24 mode from system settings */ private boolean get24HourMode() { return android.text.format.DateFormat.is24HourFormat(getContext()); } private void setFormat() { if (get24HourMode()) { mFormat = m24; } else { mFormat = m12; } } private class FormatChangeObserver extends ContentObserver { public FormatChangeObserver() { super(new Handler()); } @Override public void onChange(boolean selfChange) { setFormat(); } } public void setClockListener(ClockListener clockListener) { this.mClockListener = clockListener; } public interface ClockListener { void timeEnd(); void remainFiveMinutes(); } } 。

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