android中控件的遮盖问题

如下：会造成imagebutton被遮盖

<?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"
android:background="#ffffff"
>
<ImageButton
android:id="@+id/proper_scan_result_refresh"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/refresh"
android:layout_marginTop="3dip"
android:layout_marginRight="5dip"
android:layout_alignParentRight="true"
/>
<TextView
android:id="@+id/proper_scan_result_title"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="请您选择要连接的网络"
style="?android:attr/textAppearanceLarge"
android:textColor="#3a3a3a"
android:paddingLeft="10dip"
android:gravity="left|center_vertical"
android:background="@drawable/system_title_bg"
/>

</RelativeLayout>

但如果这样写，则imagebutton会浮在textview之上

<?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"
android:background="#ffffff"
>
<TextView
android:id="@+id/proper_scan_result_title"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="请您选择要连接的网络"
style="?android:attr/textAppearanceLarge"
android:textColor="#3a3a3a"
android:paddingLeft="10dip"
android:gravity="left|center_vertical"
android:background="@drawable/system_title_bg"
/>
<ImageButton
android:id="@+id/proper_scan_result_refresh"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/refresh"
android:layout_marginTop="3dip"
android:layout_marginRight="5dip"
android:layout_alignParentRight="true"
/>

</RelativeLayout>

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