RelativeLayout fragmentContainer = (RelativeLayout)
                mainActivity.findViewById(R.id.fragmentContainer);
        FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);

layoutParams.setMargins(0,56,0,0);
            fragmentContainer.setLayoutParams(layoutParams);

float dp = mainActivity.getResources().getDisplayMetrics().density;
            int margin = 56;
            int totalMargin =(int)  dp * margin;
            layoutParams.setMargins(0,totalMargin,0,0);
            fragmentContainer.setLayoutParams(layoutParams);