Change LinearLayout width in DrawerLayout?

How can I change params of a LinearLayout inside a DrawerLayout?

I've tried it with:

LinearLayout linearLayout;

after onCreate:

    drawerLinearLayout = (LinearLayout)findViewById(R.id.drawer);

// drawer is the id of the linearlayout, where I want to change its params

DrawerLayout.LayoutParams lp = new DrawerLayout.LayoutParams(100,100);
linearLayout.setLayoutParams(lp);

the xml is like:

        <android.support.v4.widget.DrawerLayout
            xmlns:android="http://ift.tt/nIICcg"
            xmlns:tools="http://ift.tt/LrGmb4"
            android:id="@+id/drawer"
            android:layout_width="match_parent"
            android:layout_height="match_parent" >

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical"
                tools:context=".Main" />

            <LinearLayout
                android:id="@+id/drawer"
                android:layout_width="240dp"
                android:layout_height="match_parent"
                android:orientation="vertical">

    <ListView
android:id="@+id/list"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
/>
    </LinearLayout>

        </android.support.v4.widget.DrawerLayout>

There is no error, but the size of drawer is not 100 x 100 - it takes the whole width and heigth :S