Android shape 虚线不显示

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<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="line">
    <stroke
        android:width="0.5dp"
        android:color="#DDDDDD"
        android:dashGap="4dp"
        android:dashWidth="4dp" />
    <size android:height="1dp" />
</shape>

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<View
        android:layout_width="match_parent"
        android:layout_height="2dp"
        android:layout_marginTop="@dimen/margin_20"
        android:background="@drawable/shape_dotted_line_gray_1dp"
        android:layerType="software"