Android negative margin does not work

Question

I have encountered a problem when i try to give a negative left margin to a LinearLayout.
The negative margin does not appear.
Here is my code

HorizontalScrollView hview = new HorizontalScrollView(context); //  HorizontalScrollView is the outer view   
RelativeLayout.LayoutParams hs_lot_params = new RelativeLayout.LayoutParams(164, 164);
hs_lot_params.setMargins(100, 100, 0, 0); // set the positions

ImageView image = new ImageView(context);
image.setBackgroundResource(R.drawable.leder);
LinearLayout.LayoutParams img_lot_params = new LinearLayout.LayoutParams(164, 164);
img_lot_params.setMargins(0, 0, 0, 0);

LinearLayout ll = new LinearLayout(this);
ll.setOrientation(LinearLayout.VERTICAL);
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(164, 164);
layoutParams.setMargins(-132, 0, 0, 0);
ll.addView(image, img_lot_params);
hview.addView(ll, layoutParams);

Note: my plan is to scroll the image from left to right.
First, the left part of the image is hidden and can scroll to right to see the full image

Answer 1

 ViewGroup.MarginLayoutParams params =
 (ViewGroup.MarginLayoutParams)view.getLayoutParams(); params.topMargin = -100;