Stopuhr mit currentTimeMillis - Pause Problem

protected OnClickListener mRecordListener = new OnClickListener() {
		@Override
		public void onClick(View arg0) {
			mTimer.removeCallbacks(mUpdateTimerTask);
			
			if (!mIsRecord) {
				if (mStartTime == 0L) {
					mStartTime = System.currentTimeMillis();
				}
				
				mTimer.postDelayed(mUpdateTimerTask, 100);	
			} else {
				mResumeTime = System.currentTimeMillis();
			}
			
			mIsRecord = mIsRecord ? false : true;
		}
	};

protected Runnable mUpdateTimerTask = new Runnable() {
		@Override
		public void run() {
			final long start = mStartTime;
			long millis = 0L;
			
			if (mResumeTime == 0L) {
				millis = System.currentTimeMillis() - start;
			} else {
				millis = System.currentTimeMillis() - (mResumeTime);
			}
			
			int seconds = (int) (millis / 1000);
		    int minutes = seconds / 60;
		    seconds     = seconds % 60;
		
		    if (seconds < 10) {
		        mTextTimer.setText("" + minutes + ":0" + seconds);
		    } else {
			    mTextTimer.setText("" + minutes + ":" + seconds);            
		    }
			
			mTimer.postDelayed(mUpdateTimerTask, 100);
		}
	};