How to draw a circle inside a circle using Android xml shapes?

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The only way I’ve gotten this to work is to define a transparent stroke for the inner (i.e., top) circle that’s the difference between the size of the larger and smaller circle.

For example, this:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<!-- Larger blue circle in back -->
<item>
    <shape android:shape="oval">
        <solid android:color="#00f"/>
        <size
                android:width="15dp"
                android:height="15dp"/>
    </shape>
</item>
<!-- Smaller red circle in front -->
<item>
    <shape android:shape="oval">
        <!-- transparent stroke = larger_circle_size - smaller_circle_size -->
        <stroke android:color="@android:color/transparent"
                android:width="5dp"/>
        <solid android:color="#f00"/>
        <size
                android:width="10dp"
                android:height="10dp"/>
    </shape>
</item>
</layer-list>

…looks like this:

enter image description here

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