android实现倒计时功能代码

效果图，每隔1秒，变换一下时间
 
xml:
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

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;

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();

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();
}

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;
}

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;
}

public void setEndTime(long endTime) {
this.endTime = endTime;
}

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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