我的目的是创建一个从 00:00:00 开始并与记录功能一起挂起的计时器。此记录是在服务中完成的，因此计时器也在同一服务中。如果应用程序移至后台，则记录和计时器会继续进行，并且应用程序会使用 myService.getTime() 在 onResume 处获取时间。
但我经历了两件奇怪的事情。首先是我的计时器有时比一秒快，有时更慢，有时从例如 00:00:04 跳到 00:00:06 等。其中没有一致性。我使用下面的代码，但可能有更好的选择来解决这个问题？第二个是它导致我的按钮滞后，尽管我在服务中启动它？
服务
//////////TIMER FUNCTION START//////////
private void startTimerClick() {
if (stopped) {
startTime = System.currentTimeMillis() - elapsedTime;
} else {
startTime = System.currentTimeMillis();
}
mHandler.removeCallbacks(startTimer);
mHandler.postDelayed(startTimer, 0);
}
private void pauseTimerClick() {
mHandler.removeCallbacks(startTimer);
stopped = true;
}
private void stopTimerClick() {
mHandler.removeCallbacks(startTimer);
stopped = false;
}
private void startTimer() {
startTimer = new Runnable() {
public void run() {
elapsedTime = System.currentTimeMillis() - startTime;
updateTimer(elapsedTime);
mHandler.postDelayed(this, REFRESH_RATE);
}
};
}
private void updateTimer(float time) {
secs = (long) (time / 1000);
mins = (long) ((time / 1000) / 60);
hrs = (long) (((time / 1000) / 60) / 60);
/*
* Convert the seconds to String and format to ensure it has a leading
* zero when required
*/
secs = secs % 60;
seconds = String.valueOf(secs);
if (secs == 0) {
seconds = "00";
}
if (secs < 10 && secs > 0) {
seconds = "0" + seconds;
}
/* Convert the minutes to String and format the String */
mins = mins % 60;
minutes = String.valueOf(mins);
if (mins == 0) {
minutes = "00";
}
if (mins < 10 && mins > 0) {
minutes = "0" + minutes;
}
/* Convert the hours to String and format the String */
hours = String.valueOf(hrs);
if (hrs == 0) {
hours = "00";
}
if (hrs < 10 && hrs > 0) {
hours = "0" + hours;
}
}
//////////TIMER FUNCTION END////////////
public String getHours(){
return hours;
}
public String getMinutes(){
return minutes;
}
public String getSeconds(){
return seconds;
}
}
活动（/片段）
private void timerStart() {
handler = new Handler();
Thread t = new Thread() {
@Override
public void run() {
try {
while (!isInterrupted()) {
Thread.sleep(1000);
handler.post(new Runnable() {
@Override
public void run() {
timer.setText(myService.getHours()+":"+myService.getMinutes()+":"+myService.getSeconds());
}
});
}
} catch (InterruptedException e) {
}
}
};
t.start();
}