How to set drawable size in layer-list

You can use android:width and android:height parameters with desired values.

Below is the sample drawable layer-list and screen shot. I used the vector drawable from google material icons and own selector drawable.

Original circle.xml drawable shape have 100dp x 100dp size, but into drawable.xml I override this values to 24dp x 24dp by android:width and android:height parameters.

I hope this help!

drawable.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/circle" android:height="24dp" android:width="24dp"/>
    <item android:drawable="@drawable/ic_accessibility_black_24dp"/>
    <item android:drawable="@drawable/ic_http_white_24dp" android:gravity="center" android:top="-3dp" android:height="5dp" android:width="5dp"/>
</layer-list>

circle.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape android:innerRadius="20dp" android:shape="oval">
            <solid android:color="#CCC" />
            <size android:width="100dp" android:height="100dp"/>
        </shape>
    </item>
</selector>