android countdowntimer tick不准确 [英] android countdowntimer tick is not accurate
问题描述
我正在使用倒数计时器进行音频通知......从一开始就不准确...
使用初始参数
private final long startCountDown;
private final long intervalCountDown;
...
startCountDown = 180 * 1000; // 3分钟 - 稍后从偏好设置
intervalCountDown = 60 * 1000; // 1个MNS - 从个人偏好进行设置后
...
公共无效onTick（长millisUntilFinished）{
Log.d（TAG， 通知倒计时： + millisUntilFinished +毫秒）;
}
countDownTimer = new SwimCountDownTimer（startCountDown，intervalCountDown）;
....
public void startCountDown（）{
Log.d（TAG，start countDown for+ startCountDown +msecs）;
countDownTimer.start（）;
}
我可以在日志中看到初始倒计时正确设置为180000但是下一个应该是120000，它设置为119945 !!!
04-27 14：50：42.146：I / SWIMMER （8670）：通知倒计时：180000毫秒
04-27 14：51：42.206：I / SWIMMER（8670）：通知倒计时：119945毫秒
这很烦人，因为音频通知器只能说2分钟而不是1分59秒...;为什么间隔不对...？
我可以设置自己的文本到语音字符串...但有没有办法获得正确的数据？
谢谢你建议
我知道这是一个老问题 - 但我也遇到了这个问题，并认为我会分享我的解决方案。
显然CountDownTimer不是很准确，所以我决定实施一个更精确的倒数计时器，usi ng java.util.Timer：
public abstract class PreciseCountdown extends Timer {
private long totalTime，interval，delay;
私有TimerTask任务;
private long startTime = -1;
private boolean restart = false，wasCancelled = false，wasStarted = false;
public PreciseCountdown（long totalTime，long interval）{
this（totalTime，interval，0）;
}
public PreciseCountdown（long totalTime，long interval，long delay）{
super（PreciseCountdown，true）;
this.delay = delay;
this.interval = interval;
this.totalTime = totalTime;
this.task = getTask（totalTime）;
}
public void start（）{
wasStarted = true;
this.scheduleAtFixedRate（任务，延迟，间隔）;
}
public void restart（）{
if（！wasStarted）{
start（）;
}
else if（wasCancelled）{
wasCancelled = false;
this.task = getTask（totalTime）;
start（）;
}
else {
this.restart = true;
}
}
public void stop（）{
this.wasCancelled = true;
this.task.cancel（）;
}
//当此计时器没有进一步使用时调用此方法
public void dispose（）{
cancel（）;
purge（）;
}
private TimerTask getTask（final long totalTime）{
return new TimerTask（）{
@Override
public void run（ ）{
long timeLeft;
if（startTime< 0 || restart）{
startTime = scheduledExecutionTime（）;
timeLeft = totalTime;
restart = false;
} else {
timeLeft = totalTime - （scheduledExecutionTime（） - startTime）;
if（timeLeft< = 0）{
this.cancel（）;
startTime = -1;
onFinished（）;
返回;
}
}
onTick（timeLeft）;
}
};
}
public abstract void onTick（long timeLeft）;
public abstract void onFinished（）;
}
用法示例如下：
'pre>
this.countDown =新PreciseCountdown（TOTALTIME，间隔，延迟）{
@覆盖
公共无效onTick（长的timeleft）{
/ / update ..
//请注意，这是在不同的线程上运行，所以更新任何需要使用的GUI组件Activity.runOnUiThread（）
}
@Override
public void onFinished（）{
onTick（0）; //当计时器结束时onTick不被称为
//倒计时结束
}
};
开始倒计时，只需调用countDown.start（）。
countDown.stop（）停止countDown，可以使用countDown.restart（）重新启动。
希望这对将来的任何人都有帮助。
I am using a countdown timer for audio notification... and it's not accurate from the start...
using initial parameters
private final long startCountDown;
private final long intervalCountDown;
...
startCountDown = 180 * 1000; // 3 mns - to be set from Preferences later
intervalCountDown = 60 * 1000; // 1 mns - to be set from Preferences later
...
public void onTick(long millisUntilFinished) {
Log.d(TAG, "notify countDown: " + millisUntilFinished + " msecs");
}
countDownTimer = new SwimCountDownTimer(startCountDown,intervalCountDown);
....
public void startCountDown() {
Log.d(TAG, "start countDown for " + startCountDown + " msecs" );
countDownTimer.start();
}
I can see in the log that the initial countdown is correctly set to 180000 but the next one should be 120000 and it's set to 119945 !!!
04-27 14:50:42.146: I/SWIMMER(8670): notify countDown: 180000 msecs
04-27 14:51:42.206: I/SWIMMER(8670): notify countDown: 119945 msecs
This is quite annoying as the audio notifier is expecting to say only '2 minutes" and not "1 minute and fifty nine seconds" ...; why the interval is not right ... ? I can tricj it in setting myself the text to speech string ... but is there any way to get correct data ?
thanks for suggestions
I know it's an old question- but I've also encountered the problem, and thought I would share my solution.
Apperantly CountDownTimer isn't very accurate, so I've decided to implement a more percise countdown timer, using java.util.Timer:
public abstract class PreciseCountdown extends Timer {
private long totalTime, interval, delay;
private TimerTask task;
private long startTime = -1;
private boolean restart = false, wasCancelled = false, wasStarted = false;
public PreciseCountdown(long totalTime, long interval) {
this(totalTime, interval, 0);
}
public PreciseCountdown(long totalTime, long interval, long delay) {
super("PreciseCountdown", true);
this.delay = delay;
this.interval = interval;
this.totalTime = totalTime;
this.task = getTask(totalTime);
}
public void start() {
wasStarted = true;
this.scheduleAtFixedRate(task, delay, interval);
}
public void restart() {
if(!wasStarted) {
start();
}
else if(wasCancelled) {
wasCancelled = false;
this.task = getTask(totalTime);
start();
}
else{
this.restart = true;
}
}
public void stop() {
this.wasCancelled = true;
this.task.cancel();
}
// Call this when there's no further use for this timer
public void dispose(){
cancel();
purge();
}
private TimerTask getTask(final long totalTime) {
return new TimerTask() {
@Override
public void run() {
long timeLeft;
if (startTime < 0 || restart) {
startTime = scheduledExecutionTime();
timeLeft = totalTime;
restart = false;
} else {
timeLeft = totalTime - (scheduledExecutionTime() - startTime);
if (timeLeft <= 0) {
this.cancel();
startTime = -1;
onFinished();
return;
}
}
onTick(timeLeft);
}
};
}
public abstract void onTick(long timeLeft);
public abstract void onFinished();
}
Usage example would be:
this.countDown = new PreciseCountdown(totalTime, interval, delay) {
@Override
public void onTick(long timeLeft) {
// update..
// note that this runs on a different thread, so to update any GUI components you need to use Activity.runOnUiThread()
}
@Override
public void onFinished() {
onTick(0); // when the timer finishes onTick isn't called
// count down is finished
}
};
to start the countdown, simply call countDown.start(). countDown.stop() stops the countDown, which could be restarted using countDown.restart().
Hope this is any help for anyone in the future.
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