Button with round borders

drawable-v21.xml

<ripple
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:color="?android:attr/colorControlHighlight"
    >
    <item android:id="@android:id/mask">
        <shape android:shape="rectangle">
            <solid android:color="#327DDF"/>
            <corners android:radius="4dp"/>
        </shape>
    </item>
    <item android:drawable="@drawable/rounded_border"/>
</ripple>

drawable.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true">
        <shape>
            <corners android:radius="4dp"/>
            <solid android:color="#327DDF"/>
            <stroke
                android:width="1dp"
                android:color="@color/white"
                />
        </shape>
    </item>
    <item android:drawable="@drawable/rounded_border"/>
</selector>

rounded_border.xml

<?xml version="1.0" encoding="utf-8"?>
<shape
    xmlns:android="http://schemas.android.com/apk/res/android">
    <corners android:radius="4dp"/>
    <stroke
        android:width="1dp"
        android:color="@color/white"
        />
</shape>