[android help] How to use a timer to change the position of a imageview continuously

I want to change the location of a image view every short period. The location is random numbers. Here is my code:

    rl = (RelativeLayout) findViewById(R.id.relativeLayout);
    final ImageView i = (ImageView) findViewById(R.id.imageView1);
    i.setImageResource(R.drawable.rat);

    Timer t = new Timer();
    final Handler h = new Handler();
    final Runnable r = new Runnable(){

        @Override
        public void run() {
            // TODO Auto-generated method stub
            i.requestLayout();
            rl.removeView(i);
            Display display = getWindowManager().getDefaultDisplay(); 
            int sw = display.getWidth();
            int sh = display.getHeight();
            Random w = new Random();
            Random h = new Random();
            int width = w.nextInt(sw);
            int height = h.nextInt(sh);
            tv.setText(String.format("%s",height));

            LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
            params.leftMargin = width;
            params.topMargin = height;
            i.setLayoutParams(params);
            i.requestLayout();
            rl.addView(i,params);

        }

    };
    TimerTask tt = new TimerTask(){

        @Override
        public void run() {
            // TODO Auto-generated method stub
            runOnUiThread(r);
        }

    };
    t.schedule(tt, 0, delay);

This does not work for me, the image does not change. I need someone to help me solve this. Thanks.

.

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