I am trying to shift the position of a image button when on click. I tried the following but it crashes at "rlOut.addView(imgP, p);" I have no issues when running them in onCreate().

       RelativeLayout.LayoutParams p = new RelativeLayout.LayoutParams(62, 62);
       ImageButton imgP = (ImageButton)findViewById(R.id.imgP);

        public boolean onTouch(View v, MotionEvent event) {
        // TODO Auto-generated method stub
        LayoutParams par = (LayoutParams)imbBtn.getLayoutParams();

        if(event.getAction()==MotionEvent.ACTION_DOWN)
        {
            Log.d("ok","down");
            mX = (int) event.getX() - imbBtn.getWidth() / 2;
            mY = (int) event.getY() - imbBtn.getHeight() / 2;
            et1.setText("mX down: "+String.valueOf(mX));
            et2.setText("mY down: "+String.valueOf(mY));


        }
        else if (event.getAction()==MotionEvent.ACTION_UP)
        {
            Log.d("ok","up");
            p.leftMargin=mX;
            p.rightMargin=mY;
            rlOut.addView(imgP, p);
            Log.d("ok","p");
        }