radio radiobutton radiogroup

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_checked="true" android:drawable="@drawable/icon"></item>
    <item android:drawable="@drawable/iconchecked"></item>

</selector>

<LinearLayout 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:orientation="vertical">

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" 
        android:layout_weight="1"/>

    <RadioGroup
        android:layout_gravity="bottom"
        android:layout_width="match_parent"
        android:layout_height="match_parent" 
        android:layout_weight="8"
        android:orientation="horizontal">

        <RadioButton
            android:id="@+id/rdoHome"
            style="@style/menu_radiobutton"
            android:drawableTop="@drawable/selector_radio1"
            android:text="@string/rdo1"
            android:textColor="@drawable/selector_radio"
            android:textSize="14sp" />

        <RadioButton
            android:id="@+id/rdoDev"
            style="@style/menu_radiobutton"
            android:drawableTop="@drawable/selector_radio2"
            android:text="@string/rdo2"
            android:textColor="@drawable/selector_radio"
            android:textSize="14sp" />

    </RadioGroup>

</LinearLayout>

<style name="menu_radiobutton">
    <item name="android:layout_width">wrap_content</item>
    <item name="android:layout_height">wrap_content</item>
    <item name="android:layout_weight">1</item>
    <item name="android:layout_gravity">center</item>
    <item name="android:gravity">center_horizontal</item>
    <item name="android:button">@null</item>
</style>