Custom Separator Line Android - http://pondokprogrammer.com/android-custom-separator/

dashed

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

    <stroke
        android:dashGap="3dp"
        android:dashWidth="8dp"
        android:height="2px"
        android:color="#fff" />

</shape>