drawable for buttons pressed & unpressed state

button_background_drawable.xml

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

    <!--start of pressed state-->
    <item android:state_pressed="true">
        <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">

            <solid android:color="#E0E0E0" />

            <stroke android:width="1dp" android:color="#212121" />

            <corners android:radius="50dp" />
        </shape>
    </item>
    <!--end of pressed state-->

    <!--start of unpressed state-->
    <item>
        <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">

            <solid android:color="#FEFEFE" />

            <stroke android:width="1dp" android:color="#212121" />

            <corners android:radius="50dp" />
        </shape>
    </item>
    <!--end of unpressed state-->

</selector>