Android - สอบถามปัญหาเรื่อง ต้องการเปลี่ยนค่าของ period ใน Timer เมื่อรูปภาพเปลี่ยนสไลด์

private String SrcPathConfigfileImage = "/sdcard/data/pic.txt";
	private String lineImage;    
    private int imageIndex = 0;
    private ArrayList<String> imageList;
    private ImageView slidingImage;
    private int period, delay;
    private Handler mHandler;
    private Runnable mUpdateResults;
    private Timer timer;
    
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		slidingImage = (ImageView)findViewById(R.id.imageView1);
		imageList = new ArrayList<String>();
		
		try {
			File file = new File(SrcPathConfigfileImage);
			BufferedReader bufferRead = new BufferedReader(new FileReader(file));
			while ((lineImage = bufferRead.readLine()) != null) {
				String SrcPathImage = "/sdcard/data/pic/"+lineImage;
				imageList.add(SrcPathImage);
			}
			
			playImage();

		} catch (Exception e) {
			e.printStackTrace();
			Toast.makeText(MainActivity.this, "Failed! Image = " + e.getMessage(),Toast.LENGTH_LONG).show();
		}
		
		  mHandler = new Handler();

	        // Create runnable for posting
	     mUpdateResults = new Runnable() {
	            public void run() {
	            	
	            	playImage();
	            }
	     };

	        //int period = 8000; // repeat every 4 sec.

	        timer = new Timer();

	        timer.scheduleAtFixedRate(new TimerTask() {
	        	
		        public void run() {	
		        	 mHandler.post(mUpdateResults);	
		        }

	        }, 1000, period);	        
	}

	public void playImage() {
		String srcTimePeriod = imageList.get(imageIndex % imageList.size());
		String[] splitTimePeriod = srcTimePeriod.split(",");
		String srcPartPicture = splitTimePeriod[0];
		period = Integer.parseInt(splitTimePeriod[1]);
		
		Log.d("value period", String.valueOf(period));
    	Bitmap bm = BitmapFactory.decodeFile(srcPartPicture);
   		slidingImage.setImageBitmap(bm);
   		imageIndex++;
   		
   		Animation rotateimage = AnimationUtils.loadAnimation(this, R.anim.custom_anim);       
    	slidingImage.startAnimation(rotateimage); 
    			
	}