How to setLayoutParams on dynamically added elements on Widget
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget_design);

RemoteViews newView = new RemoteViews(context.getPackageName(), R.layout.widget_item);
views.addView(R.id.view_container, newView);

LinearLayout item = (LinearLayout) ((Activity) context).findViewById(R.id.widgetItem);
MarginLayoutParams marginParams = new MarginLayoutParams(item.getLayoutParams());
marginParams.setMargins(10, 50, 4, 5);
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(marginParams);
item.setLayoutParams(layoutParams);

LinearLayout layoutParams = item.getLayoutParams();
layoutParams.setMargins(10, 50, 4, 5);
item.setLayoutParams(layoutParams);

private static void adjustViewHeight(int resID, int pixels, Activity activity){
    ((FrameLayout.LayoutParams)activity.findViewById(resID).getLayoutParams()).bottomMargin = pixels;
    activity.findViewById(resID).invalidate();
    activity.findViewById(resID).requestLayout();
}