Android 边框模糊阴影的实现

1. 使用<layer-list>标签，多个<item>套<shape>标签实现

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape android:shape="rectangle">
            <padding
                android:bottom="2dp"
                android:left="2dp"
                android:right="2dp"
                android:top="0dp" />
            <solid android:color="#0DCCCCCC" />
            <corners android:radius="8dp" />
        </shape>
    </item>
    <item>
        <shape android:shape="rectangle">
            <padding
                android:bottom="2dp"
                android:left="2dp"
                android:right="2dp"
                android:top="0dp" />
            <solid android:color="#10CCCCCC" />
            <corners android:radius="8dp" />
        </shape>
    </item>
    <item>
        <shape android:shape="rectangle">
            <padding
                android:bottom="2dp"
                android:left="2dp"
                android:right="2dp"
                android:top="0dp" />
            <solid android:color="#15CCCCCC" />
            <corners android:radius="8dp" />
        </shape>
    </item>
    <item>
        <shape android:shape="rectangle">
            <padding
                android:bottom="2dp"
                android:left="2dp"
                android:right="2dp"
                android:top="0dp" />
            <solid android:color="#20CCCCCC" />
            <corners android:radius="8dp" />
        </shape>
    </item>
    <item>
        <shape android:shape="rectangle">
            <padding
                android:bottom="2dp"
                android:left="2dp"
                android:right="2dp"
                android:top="0dp" />
            <solid android:color="#25CCCCCC" />
            <corners android:radius="8dp" />
        </shape>
    </item>
    <item>
        <shape>
            <solid android:color="#FFFFFF" />
            <corners android:radius="4dp" />
        </shape>
    </item>
</layer-list>

2.可以是用Android CardView控件实现，不过这个控件是5.0后才出现的，使用需要弄好兼容的问题

使用方法，请转至：https://blog.csdn.net/u013651026/article/details/79000205