以编程方式设置RealiveLayout中LinearLayout的边距-不起作用

在我的应用程序中,我使用片段(选项卡),当我尝试设置片段布局的LinearLayout的边距时,它不起作用。

我的布局具有此RelativeLayout

...
<RelativeLayout
     android:id="@+id/calendar_activities"
     android:layout_width="fill_parent"
     android:layout_height="match_parent"
     android:layout_marginLeft="10dp">
</RelativeLayout>
...

我的片段:

public class FragmentTabSchedule extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.fragmenttab1, container, false);

        RelativeLayout rl = (RelativeLayout) view.findViewById(R.id.calendar_activities);

        LinearLayout ll = new LinearLayout(inflater.getContext());
        ll.setOrientation(LinearLayout.VERTICAL);
        //ll.setPadding(60, 60, 60, 60);

        Resources r = inflater.getContext().getResources();

        int h = (int) TypedValue.applyDimension(
                TypedValue.COMPLEX_UNIT_DIP,
                60, 
                r.getDisplayMetrics()
        );

        LayoutParams params = new LayoutParams(
                LayoutParams.MATCH_PARENT,      
                h
        );
        params.setMargins(60, 60, 60, 60);
        ll.setLayoutParams(params);

        ll.setBackgroundColor(getResources().getColor(R.color.yellow));

        TextView act = new TextView(inflater.getContext());

        act.setText("Activity test");
        ll.addView(act);

        rl.addView(ll);



        return view;
    }

}

Linearlayout创建正确,唯一不起作用的是边距(已尝试填充但没有成功)。布局以0边距放置。

当我尝试直接在xml文件中创建代码时,它会起作用

       <RelativeLayout 
            android:id="@+id/calendar_activities"
            android:layout_width="fill_parent"
            android:layout_height="match_parent"
            android:layout_marginLeft="10dp">

            <LinearLayout 
                android:layout_width="fill_parent"
                android:layout_height="60dp"
                android:orientation="vertical"
                android:layout_marginTop="120dp"
                android:background="@color/blue">

                <TextView 
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="test"/>

            </LinearLayout>

        </RelativeLayout>