슬라이딩드로어 사용하려구하는데

제가원하는데로 되지않습니다

com.da.web.WebView 가 웹뷰 인데

가로 세로 모두fill_parent 로했는데도

실제보면 화면의 절반정도만 차지합니다

밑부분의 슬라이딩드로어가 절반정도차지하면서

검은색으로 나타나고 그영역내에서 슬라이딩됩니다

제가원하는것은

전체화면으로 웹뷰가 보이고

슬라이딩드로어를 올리면 전체의절반정도까지 펼쳐지게하고싶습니다

어떻게하면되나요?

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/LinearLayout01"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:gravity="bottom"
    >
 
    <com.da.web.WebView
        android:gravity="center|center_vertical"
        android:id="@+id/webview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">
    </com.da.web.WebView>
 
    <SlidingDrawer
        android:layout_width="wrap_content"
        android:id="@+id/SlidingDrawer"
        android:handle="@+id/slideButton"
        android:content="@+id/contentLayout"
        android:padding="10dip"
        android:layout_height="250dip"
        android:orientation="vertical">
            <Button android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/slideButton"
                >
            </Button>
            <LinearLayout
                android:layout_width="wrap_content"
                android:id="@+id/contentLayout"
                android:orientation="vertical"
                android:gravity="center"
                android:padding="10dip"
                android:layout_height="wrap_content">
            <Button
                android:id="@+id/Button01"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_margin="2dp"
                android:text="Option1">
            </Button>
            <Button
                android:id="@+id/Button02"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_margin="2dp"
                android:text="Option2"></Button>
            <Button android:id="@+id/Button03"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_margin="2dp"
                android:text="Option3">
            </Button>
            <Button android:id="@+id/Button04"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_margin="2dp"
                android:text="Option4">
            </Button>
        </LinearLayout>
    </SlidingDrawer>
</LinearLayout>