如何将渐变颜色设置为图层列表中的描边元素?

how to set gradient color to stroke element in layer-list?

我使用了包含两个项目的图层列表。第一项显示渐变颜色,第二项显示带有圆角半径的笔划元素。在这里,我想为笔触元素添加渐变颜色。

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
        <item>
            <shape android:shape="rectangle">
                <gradient
                    android:endColor="#24615A"
                    android:startColor="#44968C" />
                <corners android:radius="20dp" />
            </shape>
        </item>
        <item>
            <shape android:shape="rectangle">
                <stroke
                    android:width="5dp"
                    android:color="#0AA4F1" />
                <corners android:radius="20dp" />
            </shape>
        </item>
</layer-list>

尝试添加另一个矩形,但按如下方式调整项目填充:

<item>
    <shape android:shape="rectangle">

        <gradient
            android:centerColor="#f5e904"
            android:endColor="#ed0f12"
            android:startColor="#479644" />
        <corners android:radius="20dp" />
    </shape>
</item>

<item
    android:bottom="7dp"
    android:left="7dp"
    android:right="7dp"
    android:top="7dp">
    <shape android:shape="rectangle">

        <gradient
            android:endColor="#24615A"
            android:startColor="#44968C" />
        <corners android:radius="20dp" />
    </shape>

</item>