Convert the outer lockscreen ring to a shape drawable.

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

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<shape xmlns:android="http://schemas.android.com/apk/res/android"

    android:shape="oval"

    >

    <size android:height="270dp" android:width="270dp" />

    <solid android:color="#00000000" />

    <stroke android:color="#1affffff" android:width="2dp" />

</shape>