mapView 和textView布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <TextView
        android:id="@+id/MyTextView"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello"
        android:layout_alignParentBottom="true" />
    <com.google.android.maps.MapView
        android:id="@+id/map"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:apiKey="Your api key"
        android:enabled="true"
        android:clickable="true"
        android:layout_above="@+id/MyTextView"" />
</RelativeLayout>