android-EditText将不会显示在ListView上方

我有一个ListView活动,并且我想在其上方显示一个EditText(最后是一个按钮).

我相信我的xml很好,但是由于某种原因,EditText没有显示. ListView占据整个屏幕：(

我的XML如下所示：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <EditText
        android:id="@+id/newitemtext"
    android:layout_height="wrap_content"
    android:layout_width="fill_parent"
    android:hint="@string/add_new_item"
    android:maxLines="1"
    />
    <ListView
        android:id="@+id/android:list"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
    />
    <TextView
        android:id="@+id/android:empty"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/inbox_no_items"
    />
</LinearLayout>

有任何想法吗？

注意：在Eclipse中xml文件的布局选项卡中,将显示EditText.当我在模拟器中运行应用程序时,它不会.

感谢您的时间

更新：

这是我在onCreate方法中设置内容视图的地方

m_aryNewListItems = new ArrayList<MyListItem>();
m_Adapter = new MyListAdapter(this,R.layout.layout_list,m_aryNewListItems);
setListAdapter(m_Adapter);

这是我扩展的ArrayAdapter：

private class MyListAdapter extends ArrayAdapter<MyListItem> {

// items in the list
private ArrayList<MyListItem> m_items;

// constructor
public MyListAdapter(Context context,int textViewResourceId,ArrayList<MyListItem> items) {
        super(context,textViewResourceId,items);
        this.m_items = items;
}

// get specific list item
public MyListItem getItem(int position) {
    if (m_items.size() > position) {
        return m_items.get(position);
    }
    else {
        return null;
    }
}

/*
 * Update screen display
 */
@Override
public View getView(int position,View convertView,ViewGroup parent) {

    // get the View for this list item
    View v = convertView;
    if (v == null) {
        LayoutInflater vi = (LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        v = vi.inflate(R.layout.layout_list_item,null);
    }

    // get the next MyListItem object
    MyListItem lstItem = m_items.get(position);

    // set up the list item
    if (lstItem != null) {
        TextView txtItem = (TextView) v.findViewById(R.id.list_itemname);
        TextView txtQty = (TextView) v.findViewById(R.id.list_itemqty);
        TextView txtPlace = (TextView) v.findViewById(R.id.list_place);

        // set item text
        if (txtItem != null) {
            txtItem.setText(lstItem.getItemName());
        }

        // set qty text
        String strQtyText = "Qty: ";
        if (txtQty != null && lstItem.getItemQty() != -1) {
            BigDecimal bd = new BigDecimal(lstItem.getItemQty());
            strQtyText += bd.stripTrailingZeros().toString();
            if(lstItem.getItemQtyUnitId() != -1) {
                strQtyText += " " + lstItem.getItemQtyUnitTextAbbrev();
            }
        }
        else {
            strQtyText += "--";
        }
        txtQty.setText(strQtyText);

        // set place text
        if (txtPlace != null && lstItem.getPlaceName() != null) {
            txtPlace.setText(lstItem.getPlaceName());
        }
    }

    // return the created view
    return v;
}

}