CountdownTimerPausable

CountdownExtended.java

public class CountDownExtended extends CountdownTimerPausable {

    private static final String TAG = "CountDownExtended";
    private static final String BAD_COUNTDOWN_LISTENER_MESSAGE = "countDownListener is null";
    CountDownListener countDownListener;

    public long getMillisUntilFinished() {
        return millisUntilFinished;
    }

    private long millisUntilFinished;
    private long millisUntilFinishedPaused;


    /***********************************************************************************************
     *
     * @param startTimeSeconds segundos de inicialización de la cuenta atrás (120s = 120000ms = 2min)
     * @param countDownListenerActivity
     *
     **********************************************************************************************/
    public CountDownExtended(long startTimeSeconds, CountDownListener countDownListenerActivity) {
        super(startTimeSeconds * 1000L, 1000);
        if(countDownListenerActivity != null){
            this.countDownListener = countDownListenerActivity;
        } else {
            throw new RuntimeException(BAD_COUNTDOWN_LISTENER_MESSAGE.concat(" setCountDownListener"));
        }
    }

//    public void pause() {
//        millisUntilFinishedPaused = millisUntilFinished;
//        cancel();
//    }
//
//    public CountDownExtended resume() {
//        CountDownExtended countDownExtended2 = new CountDownExtended(millisUntilFinishedPaused, countDownListener);
//        countDownExtended2.start();
//        return countDownExtended2;
//    }


    @Override
    public void onFinish() {
        Timber.i("millis onFinish ");
        if(countDownListener != null){
            this.countDownListener.timeEnded();
            cancel();
        } else {
            throw new RuntimeException(BAD_COUNTDOWN_LISTENER_MESSAGE.concat(" timeEnded"));
        }
    }


    @Override
    public void onTick(long millisUntilFinished) {

        if(countDownListener == null){
            throw new RuntimeException(BAD_COUNTDOWN_LISTENER_MESSAGE.concat(" onTick"));
        }

        this.millisUntilFinished = millisUntilFinished;

    }


    public interface CountDownListener {
        void timeEnded();
    }


}

CountdownTimerPausable.java

/**
 * Schedule a countdown until a time in the future, with
 * regular notifications on intervals along the way.
 *
 * Example of showing a 30 second countdown in a text field:
 *
 * <pre class="prettyprint">
 * new CountdownTimer(30000, 1000) {
 *
 *     public void onTick(long millisUntilFinished) {
 *         mTextField.setText("seconds remaining: " + millisUntilFinished / 1000);
 *     }
 *
 *     public void onFinish() {
 *         mTextField.setText("done!");
 *     }
 *  }.start();
 * </pre>
 *
 * The calls to {@link #onTick(long)} are synchronized to this object so that
 * one call to {@link #onTick(long)} won't ever occur before the previous
 * callback is complete.  This is only relevant when the implementation of
 * {@link #onTick(long)} takes an amount of time to execute that is significant
 * compared to the countdown interval.
 */
public abstract class CountDownTimer {

    /**
     * Millis since epoch when alarm should stop.
     */
    private final long mMillisInFuture;

    /**
     * The interval in millis that the user receives callbacks
     */
    private final long mCountdownInterval;

    private long mStopTimeInFuture;

    private long mPauseTime;

    private boolean mCancelled = false;

    private boolean mPaused = 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 CountDownTimer(long millisInFuture, long countDownInterval) {
        mMillisInFuture = millisInFuture;
        mCountdownInterval = countDownInterval;
    }

    /**
     * Cancel the countdown.
     *
     * Do not call it from inside CountDownTimer threads
     */
    public final void cancel() {
        Timber.i("CountDownTimer cancel");
        mHandler.removeMessages(MSG);
        mCancelled = true;
    }

    /**
     * Start the countdown.
     */
    public final synchronized CountDownTimer start() {
        Timber.i("CountDownTimer start");
        if (mMillisInFuture <= 0) {
            onFinish();
            return this;
        }
        mStopTimeInFuture = SystemClock.elapsedRealtime() + mMillisInFuture;
        mHandler.sendMessage(mHandler.obtainMessage(MSG));
        mCancelled = false;
        mPaused = false;
        return this;
    }

    /**
     * Pause the countdown.
     */
    public long pause() {
        if (mPaused) {
            return mPauseTime;
        } else {
            mPauseTime = mStopTimeInFuture - SystemClock.elapsedRealtime();
            Timber.i("CountDownTimer pause");
            mPaused = true;
            mHandler.removeMessages(MSG);
            return mPauseTime;
        }
    }

    /**
     * Resume the countdown.
     */
    public long resume() {
        if (mPaused) {
            mStopTimeInFuture = mPauseTime + SystemClock.elapsedRealtime();
            Timber.i("CountDownTimer resume");
            mPaused = false;
            mHandler.sendMessage(mHandler.obtainMessage(MSG));
            return mPauseTime;
        } else {
            return mStopTimeInFuture;
        }
    }

    /**
     * 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 (CountDownTimer.this) {
                if (!mPaused) {
                    final long millisLeft = mStopTimeInFuture - SystemClock.elapsedRealtime();

                    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;
                        }

                        if (!mCancelled) {
                            sendMessageDelayed(obtainMessage(MSG), delay);
                        }
                    }
                }
            }
        }
    };
}