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<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true"
          android:drawable="@color/colorPrimary" /> <!-- pressed -->
    <item android:drawable="@color/colorPrimaryDarker" /> <!-- default -->
</selector>

// v 21
<?xml version="1.0" encoding="utf-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
        android:color="@color/colorPrimaryDarker">
    <item>
        <shape
            android:shape="rectangle">
            <solid android:color="@color/colorPrimary"/>
        </shape>
    </item>
</ripple>

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
    <item
        android:bottom="1dp"
        android:left="-2dp"
        android:right="-2dp"
        android:top="-2dp">
        <shape android:shape="rectangle" >
            <stroke
                android:width="1dp"
                android:color="#FF000000" />

            <solid android:color="00FFFFFF" />

            <padding android:left="10dp"
                     android:right="10dp"
                     android:top="10dp"
                     android:bottom="10dp" />
        </shape>
    </item>

</layer-list>