Android : Switch button in Android

So I'm trying to customize a switch button a little bit. The way I want it to look is the following:

http://imgur.com/rn8Ttmb

What I tried implementing so far is:

<Switch
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/switchButton"
        android:layout_marginBottom="40dp"
        android:textOn=""
        android:thumb="@drawable/shape_track"
        android:track="@drawable/shape_thumb"
        android:layout_marginRight="10dp"
        android:textOff="       "
        android:layout_alignParentBottom="true"
        android:layout_toRightOf="@+id/dateOutput"/>

Shape_thumb:

<?xml version="1.0" encoding="utf-8"?>

<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
    <size android:height="30dp"/>
    <corners
        android:radius="3dp"/>

    <stroke
        android:width="2dp"
        android:color="@color/wampRed"/>

</shape>

Shape_track :

<?xml version="1.0" encoding="utf-8"?>

<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
<solid android:color="@color/wampRed"/>
    <corners android:radius="2dp"/>
    <stroke android:width="1.5dp" android:color="@color/wampWhite"/>
    <padding android:bottom="3dp" android:left="3dp" android:right="3dp" android:top="3dp"/>
</shape>

Problem is I'm not really sure how to create the border for the inside part of the switch. What's more, I found it hard playing with the height/width of the switch button overall.