This is my solution(There is a nested LinearLayout):
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="@+id/item"
android:layout_width="match_parent"
android:layout_height="47dp"
android:background="@drawable/box_arrow_top_bg"
android:gravity="center"
android:text="????"
android:textColor="#666"
android:textSize="16sp" />
</LinearLayout>
</LinearLayout>