Programmatically unable to align ImageView in RelativeLayout

I am having problems adding an image to a relative layout. I would like to add an image to the list of menu items that I create dynamically using RelativeLayout. All my menu items are displayed normally and in order, but when I try to add an image to each of the items, I get only one arrow, and it does not center vertically. Below is my code.

In my xml file

<RelativeLayout 
            android:id="@+id/pMenu"
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

        </RelativeLayout>

In my code:

private void buildMenu(String name, int id) {

    String[] menuItems = getResources().getStringArray(pMenus[id]);
    // Get the rel layout from xml
    RelativeLayout container = (RelativeLayout) findViewById(R.id.pMenu);

    int imageId=1;
    Typeface tf = Typeface.createFromAsset(this.getAssets(),"mreavesmodot-reg.otf");
    for(String menuItem: menuItems) {           

        // Defining the layout parameters
        RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
                RelativeLayout.LayoutParams.WRAP_CONTENT,
                RelativeLayout.LayoutParams.WRAP_CONTENT);


        StyledButton menuImage = new StyledButton(this);
        menuImage.setBackgroundResource(R.drawable.menu_button);
        menuImage.setText(menuItem);
        menuImage.setTypeface(tf);
        menuImage.setTextSize(19);
        menuImage.setPadding(20, 0, 0, 0);
        menuImage.setTextColor(Color.WHITE);
        menuImage.setGravity(Gravity.LEFT | Gravity.CENTER_VERTICAL);
        menuImage.setOnClickListener(getOnClickListener(menuImage, name));
        menuImage.setId(imageId);

        if(imageId==1) {
            lp.addRule(RelativeLayout.ALIGN_PARENT_TOP);
        } else {
            lp.addRule(RelativeLayout.BELOW ,imageId-1);
        }
        menuImage.setLayoutParams(lp);


        ImageView arrow = new ImageView(this);
        arrow.setImageResource(R.drawable.arrow_menu);
        arrow.setPadding(0, 0, 15, 0);
        RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams( RelativeLayout.LayoutParams.WRAP_CONTENT, 
                RelativeLayout.LayoutParams.WRAP_CONTENT );
        params.addRule(RelativeLayout.ALIGN_RIGHT,menuImage.getId());
        params.addRule(RelativeLayout.CENTER_VERTICAL);

        arrow.setLayoutParams(params);

        container.addView(menuImage);
        container.addView(arrow);

        imageId++;
    }
}