If you need something like this:
You can use this layout:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity"
>
<RadioGroup
android:id="@+id/radioGrp"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:background="@drawable/gender_old"
android:paddingTop="64dp"
android:paddingLeft="8dp"
android:paddingRight="8dp"
>
<RadioButton
android:id="@+id/radioM"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="left"
android:checked="true"
android:drawableRight="@drawable/male"
android:layout_weight="1"
android:textSize="14dp"
android:text="Male"
/>
<RadioButton
android:id="@+id/radioF"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:checked="false"
android:drawableRight="@drawable/female"
android:layout_weight="1"
android:textSize="14dp"
android:text="Female"
/>
</RadioGroup>
</RelativeLayout>