Adding button in preferencescreen added in xml folder

Question

I have created preference screen with below data, I want to add a button, how can I add a button in preference screen. I tried using Button directly in code but it gave an exception. Please help me out with this.

    <PreferenceCategory android:title="All numbers">

        <SwitchPreference
                android:key="switch_key"
                android:defaultValue="false"
                android:disableDependentsState="true"
                android:title="Block all calls:"/>

    </PreferenceCategory>
<PreferenceCategory android:title="Individual numbers">

    <SwitchPreference
            android:key="individual_number"
            android:defaultValue="false"
            android:dependency="switch_key"
            android:title="Block selected calls:"/>
    <EditTextPreference
            android:title="Number 1"
            android:dependency="individual_number"
            android:key="first_number"
            android:inputType="number"/>
</PreferenceCategory>