暂停/恢复 CountDownTimer Android [英] Pause/Resume CountDownTimer Android
问题描述
是否可以在 Android 中暂停 CountDownTimer?我一直在寻找好的解决方案，但我只是找到了一些我真的不喜欢的方法.就像将剩余时间保存在变量中并使用该值初始化一个新的 CountDownTimer 一样.
Is it possible to pause a CountDownTimer in Android? I have been looking for good solutions but I just find some ways to do this that I really don't like. As just save the left time in a variable and initialize a new CountDownTimer with that values.
那种解决方案有效，但它们看起来不太好，因为我正在使用圆形进度条和 Textview 以及我的倒计时计时器.真的很难看，尝试用倒计时让这两个看起来不错，而不能真正暂停"它.
That kind of solutions work but they didn't look so good because I´m using a circle Progress bar and a Textview together with my countdownTimer. Was really ugly try to look this two look good with the CountDown without be able to really "pause" it.
这是我使用 ProgressBar 和 TextView 初始化 CountDownTimer 的代码.
Here is my code for initialize the CountDownTimer with a ProgressBar and a TextView.
public void initProgress() {
if (mCountdownProgressBar == null)
mCountdownProgressBar = (CircleProgressBar) findViewById(R.id.progressBar);
mCountDownTime = 30000; //Insert your desire time in Milliseconds here
mCountdownProgressBar.setMaxProgress((int)TimeUnit.MILLISECONDS.toSeconds(mCountDownTime));
mCountDownTimer = new CustomCountDownTimer(mCountDownTime, 1000) {
@Override
public void onTick(long millisUntilFinished) {
Log.v("Log_tag", "Tick of Progress" + TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished));
mCountdownProgressBar.setmProgress(TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished));
mTimer.setText(Util.getTimeForTimer(millisUntilFinished, Util.TIME_FORMAT));
}
@Override
public void onFinish() {
mCountdownProgressBar.setmProgress(0);
mTimer.setText(Util.getTimeForTimer(0, Util.TIME_FORMAT));
}
};
mCountDownTimer.start();
}
使用此代码，您将能够将一个 progressBar 和一个 TextView 与您的 CountDownTimer 一起设置.为了能够轻松地暂停和恢复它，我接下来将发布一个 CountDownTimer 的自定义类.
With this code you will be able to set a progressBar and a TextView together with your CountDownTimer. To be able to pause and resume it pretty easy I will post next a Custom Class for CountDownTimer.
推荐答案
这是解决方案！
import android.os.Handler;
import android.os.Message;
import android.os.SystemClock;
import android.util.Log;
public abstract class CustomCountDownTimer {
private final String TAG = "CustomCountDownTimer";
/**
* Millis since epoch when alarm should stop.
*/
private final long mMillisInFuture;
/**
* The interval in millis that the user receives callbacks
*/
private final long mCountdownInterval;
/**
* The time in millis when the timer was paused
*/
private long mTimePaused;
/**
* The final time when the timer must to stop (actual hour + countdown in millis)
*/
private long mStopTimeInFuture;
/**
* boolean representing if the timer was cancelled
*/
private boolean mCancelled = false;
/**
* boolean representing if the timer is paused
*/
private boolean mPause = false;
/**
* @param millisInFuture The number of millis in the future from the call
* to {@link #start()} until the countdown is done and {@link #onFinish()}
* is called.
* @param countDownInterval The interval along the way to receive
* {@link #onTick(long)} callbacks.
*/
public CustomCountDownTimer(long millisInFuture, long countDownInterval) {
mMillisInFuture = millisInFuture;
mCountdownInterval = countDownInterval;
}
/**
* Cancel the countdown.
*/
public synchronized final void cancel() {
mCancelled = true;
mHandler.removeMessages(MSG);
}
/**
* Pause the countdown.
*/
public synchronized final void pause() {
cancel();
//Save the time and hour to resume the timer correctly later.
mTimePaused = SystemClock.elapsedRealtime();
mPause = true;
}
/**
* Resume the countdown.
*/
public synchronized final void resume() {
//Booleans back to false value
mPause = false;
mCancelled = false;
//We set the time to a new one because the elapsedTime as change
mStopTimeInFuture = mStopTimeInFuture + (SystemClock.elapsedRealtime() - mTimePaused);
Log.d(TAG, "mStopTimeInFuture: " + mStopTimeInFuture);
mHandler.sendMessage(mHandler.obtainMessage(MSG));
}
/**
* Start the countdown.
*/
public synchronized final CustomCountDownTimer start() {
mCancelled = false;
mPause = false;
if (mMillisInFuture <= 0) {
onFinish();
return this;
}
mStopTimeInFuture = SystemClock.elapsedRealtime() + mMillisInFuture;
mHandler.sendMessage(mHandler.obtainMessage(MSG));
return this;
}
/**
* Callback fired on regular interval.
*
* @param millisUntilFinished The amount of time until finished.
*/
public abstract void onTick(long millisUntilFinished);
/**
* Callback fired when the time is up.
*/
public abstract void onFinish();
private static final int MSG = 1;
// handles counting down
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
synchronized (CustomCountDownTimer.this) {
if (mCancelled || mPause) {
return;
}
final long millisLeft = mStopTimeInFuture - SystemClock.elapsedRealtime();
Log.d(TAG, "millisLeft: " + millisLeft);
if (millisLeft <= 0) {
onFinish();
} else if (millisLeft < mCountdownInterval) {
// no tick, just delay until done
sendMessageDelayed(obtainMessage(MSG), millisLeft);
} else {
long lastTickStart = SystemClock.elapsedRealtime();
onTick(millisLeft);
// take into account user's onTick taking time to execute
long delay = lastTickStart + mCountdownInterval - SystemClock.elapsedRealtime();
// special case: user's onTick took more than interval to
// complete, skip to next interval
while (delay < 0) delay += mCountdownInterval;
sendMessageDelayed(obtainMessage(MSG), delay);
}
}
}
};
}
这篇关于暂停/恢复 CountDownTimer Android的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
