Ensure gradually increasing volume is immune to time jumps

import android.os.HandlerThread;

import android.os.Looper;

import android.os.Message;

import android.os.SystemClock;

import android.preference.PreferenceManager;

import android.telephony.TelephonyManager;

import android.text.format.DateUtils;

                    // Compute the time at which the crescendo will stop.

                    mCrescendoDuration = getCrescendoDurationMillis(context);

                    mCrescendoStopTime = System.currentTimeMillis() + mCrescendoDuration;

                    mCrescendoStopTime = now() + mCrescendoDuration;

                    scheduleVolumeAdjustment = true;

                }

            }

            // If the crescendo is complete set the volume to the maximum; we're done.

            final long currentTime = System.currentTimeMillis();

            final long currentTime = now();

            if (currentTime > mCrescendoStopTime) {

                mCrescendoDuration = 0;

                mCrescendoStopTime = 0;

                // Compute the time at which the crescendo will stop.

                mCrescendoDuration = getCrescendoDurationMillis(context);

                mCrescendoStopTime = System.currentTimeMillis() + mCrescendoDuration;

                mCrescendoStopTime = now() + mCrescendoDuration;

                scheduleVolumeAdjustment = true;

            }

            }

            // If the crescendo is complete set the volume to the maximum; we're done.

            final long currentTime = System.currentTimeMillis();

            final long currentTime = now();

            if (currentTime > mCrescendoStopTime) {

                mCrescendoDuration = 0;

                mCrescendoStopTime = 0;

            return true;

        }

    }

    /**

     * @return the current elapsed time which is immune to device time changes

     */

    private static long now() {

        return SystemClock.elapsedRealtime();

    }

}