android - RadioGroup and TextView in a RelativeLayout - RadioGroup is hiding TextView -

this trying accomplish. textview , beneath radiobutton group in radiobuttons added programmatically. able radiobutton group displayed radiobuttons , not textview. radiobutton group taking space in layout , textview invisible.

i have looked numerous posts on stackoverflow.com on formatting , displaying in layout still not figure making mistake.

could please me issue?

<?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="horizontal" >      <listview         android:id="@android:id/list"         android:layout_width="match_parent"         android:layout_height="match_parent" >     </listview>      <textview         android:id="@+id/sample"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:layout_gravity="center"         android:layout_marginbottom="20dp"         android:layout_margintop="20dp"         android:background="@color/black"         android:gravity="center"         android:text="@string/sample"         android:textcolor="@color/white" />      <radiogroup         android:id="@+id/radio_group"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:background="@color/white"         android:orientation="vertical" >     </radiogroup>  </relativelayout> 

change relativelayout linearlayout. there no 'orientation' property relativelayout, things 'relative' each other.