Android-用数组填充ListView

我不能用字符串数组填充ListView布局。活动如下:

 ListView symptomList = (ListView) findViewById(R.id.ListView_Symptom);
 String symptomsArray[] = new String[1024];
 // Then I fill up symptomsArray
 ArrayAdapter<String> adapt = new ArrayAdapter<String>(this, R.layout.menu_item, symptomsArray);
    symptomList.setAdapter(adapt);

这是菜单项:

<TextView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:textSize="@dimen/menu_item_size"
android:text="test string"
android:layout_gravity="center_horizontal"
android:layout_height="wrap_content"
android:shadowRadius="5"
android:gravity="center"
android:shadowDy="3"
android:shadowDx="3" />

这里是symptom.xml-

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ListView
        android:layout_height="wrap_content"
        android:id="@+id/ListView_Symptom"
        android:layout_width="fill_parent"
        android:divider="@drawable/divider"
        android:listSelector="@drawable/textured"
        android:layout_alignParentTop="true"></ListView>

 </LinearLayout>

有人知道怎么回事吗?我的公共类需要扩展“listactivity”吗?我试过了,但没用。