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<RadioGroup
        android:id="@+id/tipologia"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:gravity="center"
        android:orientation="horizontal"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp">

        <RadioButton
            android:id="@+id/fonia"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@drawable/radio_button"
            android:button="@null"
            android:checked="false"
            android:gravity="center"
            android:padding="5dp"
            android:text="Fonia"
            android:textColor="@drawable/radio_button_selector" />

        <RadioButton
            android:id="@+id/adsl"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@drawable/radio_button"
            android:button="@null"
            android:gravity="center"
            android:padding="5dp"
            android:text="Adsl"
            android:textColor="@drawable/radio_button_selector"
            android:checked="false"/>

        <RadioButton
            android:id="@+id/fibra"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@drawable/radio_button"
            android:button="@null"
            android:gravity="center"
            android:padding="5dp"
            android:text="Fibra"
            android:textColor="@drawable/radio_button_selector"
            android:checked="false"/>
        <RadioButton
            android:id="@+id/altro"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@drawable/radio_button"
            android:button="@null"
            android:gravity="center"
            android:padding="5dp"
            android:text="Altro"
            android:textColor="@drawable/radio_button_selector"
            android:checked="false"/>
    </RadioGroup>

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

    <item android:state_checked="true">
        <shape>
            <solid android:color="@color/primario_1" />
            <stroke android:width="1dp" android:color="@color/primario_1" />
        </shape>
    </item>

    <item android:state_checked="false">
        <shape android:shape="rectangle">
            <solid android:color="@color/bgcolor" />
            <stroke android:width="1dp" android:color="@color/primario_1" />
        </shape>
    </item>

</selector>

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

    <item android:state_checked="true" android:color="@color/bgcolor"/>
    <item android:color="@color/primario_1"/>

</selector>