完整的Android程序，主要功能是實(shí)現(xiàn)秒表計(jì)時(shí)
需求：
默認(rèn)為"00:00:00"，點(diǎn)擊開(kāi)始按鈕時(shí)清零后開(kāi)始計(jì)時(shí)，出現(xiàn)如10:28:34。點(diǎn)擊停止的時(shí)候停止計(jì)時(shí)。
問(wèn)題：
使用Calendar DateFormat的方法，不設(shè)置時(shí)區(qū)獲取到的小時(shí)是本地時(shí)區(qū)的（東八區(qū)的就是8），設(shè)置成GMT標(biāo)準(zhǔn)時(shí)區(qū)獲取到的時(shí)間是12小時(shí)(12:00:00)，設(shè)置24小時(shí)制無(wú)效。
在開(kāi)始時(shí)間加減各種小時(shí)都無(wú)效，而且計(jì)時(shí)只能到12小時(shí)就自動(dòng)跳上去了，始終無(wú)法出現(xiàn)默認(rèn)狀態(tài)00:00:00開(kāi)始計(jì)時(shí)的效果。
嘗試各種時(shí)間設(shè)置方法無(wú)效后只能自己寫(xiě)一個(gè)根據(jù)秒數(shù)轉(zhuǎn)換時(shí)間格式字符串的方法了，經(jīng)過(guò)測(cè)試是沒(méi)問(wèn)題的，兩位數(shù)只能顯示99小時(shí)為最大，如需要更大小時(shí)數(shù)需要改改方法。
另外小時(shí)數(shù)也不能無(wú)限大，超過(guò)long數(shù)據(jù)類型長(zhǎng)度會(huì)變成負(fù)數(shù)的，會(huì)出現(xiàn)異常的。
顯示效果：
測(cè)試類：
1 public class TestTime {
2 public static void main(String[] args) {
3 TestTime tt = new TestTime();
4 tt.showTimeCount(99*3600000+75*1000);
5 }
6
7 //時(shí)間計(jì)數(shù)器，最多只能到99小時(shí)，如需要更大小時(shí)數(shù)需要改改方法
8 public String showTimeCount(long time) {
9 System.out.println("time="+time);
10 if(time >= 360000000){
11 return "00:00:00";
12 }
13 String timeCount = "";
14 long hourc = time/3600000;
15 String hour = "0" + hourc;
16 System.out.println("hour="+hour);
17 hour = hour.substring(hour.length()-2, hour.length());
18 System.out.println("hour2="+hour);
19
20 long minuec = (time-hourc*3600000)/(60000);
21 String minue = "0" + minuec;
22 System.out.println("minue="+minue);
23 minue = minue.substring(minue.length()-2, minue.length());
24 System.out.println("minue2="+minue);
25
26 long secc = (time-hourc*3600000-minuec*60000)/1000;
27 String sec = "0" + secc;
28 System.out.println("sec="+sec);
29 sec = sec.substring(sec.length()-2, sec.length());
30 System.out.println("sec2="+sec);
31 timeCount = hour + ":" + minue + ":" + sec;
32 System.out.println("timeCount="+timeCount);
33 return timeCount;
34 }
35
36 }實(shí)際例子：
1 //時(shí)間計(jì)數(shù)器，最多只能到99小時(shí)，如需要更大小時(shí)數(shù)需要改改方法
2 public String showTimeCount(long time) {
3 if(time >= 360000000){
4 return "00:00:00";
5 }
6 String timeCount = "";
7 long hourc = time/3600000;
8 String hour = "0" + hourc;
9 hour = hour.substring(hour.length()-2, hour.length());
10
11 long minuec = (time-hourc*3600000)/(60000);
12 String minue = "0" + minuec;
13 minue = minue.substring(minue.length()-2, minue.length());
14
15 long secc = (time-hourc*3600000-minuec*60000)/1000;
16 String sec = "0" + secc;
17 sec = sec.substring(sec.length()-2, sec.length());
18 timeCount = hour + ":" + minue + ":" + sec;
19 return timeCount;
20 }
21
22 private Handler stepTimeHandler;
23 private Runnable mTicker;
24 long startTime = 0;
25
26 //開(kāi)始按鈕
27 class startBtnListener implements OnClickListener {
28 @Override
29 public void onClick(View v) {
30 Button b = (Button)v;
31 String buttonText = b.getText().toString();
32 if("Start".equalsIgnoreCase(buttonText)){
33 b.setText("Stop");
34 // 清零 開(kāi)始計(jì)時(shí)
35 stepTimeTV.setText("00:00:00");
36 stepTimeHandler = new Handler();
37 startTime = System.currentTimeMillis();
38 mTicker = new Runnable() {
39 public void run() {
40 String content = showTimeCount(System.currentTimeMillis() - startTime);
41 stepTimeTV.setText(content);
42
43 long now = SystemClock.uptimeMillis();
44 long next = now + (1000 - now % 1000);
45 stepTimeHandler.postAtTime(mTicker, next);
46 }
47 };
48 //啟動(dòng)計(jì)時(shí)線程，定時(shí)更新
49 mTicker.run();
50 }else{
51 b.setText("Start");
52 //停止計(jì)時(shí) Remove any pending posts of Runnable r that are in the message queue.
53 stepTimeHandler.removeCallbacks(mTicker);
54 }
55 }
56 }用時(shí)間格式化的方式測(cè)試代碼：
1 //開(kāi)始按鈕 通過(guò)Calendar時(shí)間設(shè)置的方式，無(wú)法正常顯示小時(shí)為0
2 class startBtnListener implements OnClickListener {
3 @Override
4 public void onClick(View v) {
5 Button b = (Button)v;
6 String buttonText = b.getText().toString();
7 if("Start".equalsIgnoreCase(buttonText)){
8 b.setText("Stop");
9 // 清零 開(kāi)始計(jì)時(shí)
10 stepTimeTV.setText("00:00:00");
11 if (mCalendar == null) {
12 mCalendar = Calendar.getInstance();
13 TimeZone tz = TimeZone.getTimeZone("GMT");//GMT+8
14 mCalendar.setTimeZone(tz);
15 mCalendar.get(Calendar.HOUR_OF_DAY);//24小時(shí)制
16 }
17 stepTimeHandler = new Handler();
18 //System.uptimeMillis() //記錄從機(jī)器啟動(dòng)后到現(xiàn)在的毫秒數(shù)，當(dāng)系統(tǒng)進(jìn)入深度睡眠時(shí)，此計(jì)時(shí)器將會(huì)停止
19 //System.currentTimeMillis() //返回自1970年1月1日到現(xiàn)在的毫秒數(shù)，通常用來(lái)設(shè)置日期和時(shí)間
20 //System.elapsedRealtime() //返回從機(jī)器啟動(dòng)后到現(xiàn)在的毫秒數(shù)，包括系統(tǒng)深度睡眠的時(shí)間，api里沒(méi)有這個(gè)方法
21 //直接取得的是當(dāng)?shù)貢r(shí)區(qū)時(shí)間，當(dāng)?shù)貢r(shí)間跟時(shí)區(qū)有關(guān),設(shè)置GMT后始終多12小時(shí)
22 startTime = System.currentTimeMillis();//12*3600000 - 36*3600000減掉或者加上12小時(shí)都不行
3 mTicker = new Runnable() {
24 public void run() {
25 //這個(gè)減出來(lái)的日期是1970年的 時(shí)間格式不能出現(xiàn)00:00:00 12:00:00
26 long showTime = System.currentTimeMillis() - startTime;
27 Log.i(TAG,showTime+"");
28 mCalendar.setTimeInMillis(showTime + 13*3600000 + 1000);
29 String content = (String) DateFormat.format(mFormat, mCalendar);
30 stepTimeTV.setText(content);
31
32 long now = SystemClock.uptimeMillis();
33 long next = now + (1000 - now % 1000);
34 stepTimeHandler.postAtTime(mTicker, next);
35 }
36 };
37 //啟動(dòng)計(jì)時(shí)線程，定時(shí)更新
38 mTicker.run();
39 }else{
40 b.setText("Start");
41 //停止計(jì)時(shí) Remove any pending posts of Runnable r that are in the message queue.
42 stepTimeHandler.removeCallbacks(mTicker);
43 }
44 }
45 }
46
47 private Handler stepTimeHandler;
48 Calendar mCalendar;
49 String mFormat = "yyyy-MM-dd hh:mm:ss";//yyyy-MM-dd
50 long startTime = 0;
51 private Runnable mTicker;
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