Prevent race condition when clearing timers

import java.util.ArrayList;

import java.util.Collections;

import java.util.Comparator;

import java.util.LinkedList;

public class TimerFragment extends DeskClockFragment

    }

    public void stopAllTimesUpTimers() {

        boolean notifyChange = 0 < mAdapter.getCount();

        while (0 < mAdapter.getCount()) {

            TimerObj timerObj = (TimerObj) mAdapter.getItem(0);

        boolean notifyChange = false;

        //  To avoid race conditions where a timer was dismissed and it is still in the timers list

        // and can be picked again, create a temporary list of timers to be removed first and

        // then removed them one by one

        LinkedList<TimerObj> timesupTimers = new LinkedList<TimerObj>();

        for (int i = 0; i  < mAdapter.getCount(); i ++) {

            TimerObj timerObj = (TimerObj) mAdapter.getItem(i);

            if (timerObj.mState == TimerObj.STATE_TIMESUP) {

                onStopButtonPressed(timerObj);

                timesupTimers.addFirst(timerObj);

                notifyChange = true;

            }

        }

        while (timesupTimers.size() > 0) {

            onStopButtonPressed(timesupTimers.remove());

        }

        if (notifyChange) {

            SharedPreferences.Editor editor = mPrefs.edit();

            editor.putBoolean(Timers.FROM_ALERT, true);