<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@+id/shape_id">
    <!-- 正三角 -->
    <rotate
        android:fromDegrees="45"
        android:toDegrees="45"
        android:pivotX="100%"
        android:pivotY="100%">
        <shape android:shape="rectangle">
            <solid android:color="@color/theme_white_color"/>
        </shape>
    </rotate>
    </item>
</layer-list>