Android:陰影效果的另一種實現方法：layer-list

主要的實現思路是利用兩個佈局進行疊加，底下的那個佈局顏色進行漸變。結果就是顯示的效果不如CardView好。

下面將代碼貼出來，僅供參考：

資源文件：

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="white">#ffffffff</color>
    <color name="green">#dbd9d8</color>
    <color name="black_1">#ff000000</color>
    <color name="black_2">#00000000</color>
</resources>

將下面的存在drawable文件下，將其作爲背景：

 <?xml version="1.0" encoding="UTF-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:top="1dp">
        <shape>
            <!-- <solid android:color="@color/black" /> -->
            <corners android:radius="@dimen/user_gender_corners" />
            <padding
                android:bottom="1.5px"
                android:left="1.5px"
                android:right="1.5px"
                android:top="1.5px" />

            <gradient
                android:startColor="@color/listitem_black"
                android:endColor="@color/feed_card_t2_endcolor"
                android:angle="270"/>
        </shape>
    </item>

    <item  android:bottom="6dp">
        <shape>
            <!-- <solid android:color="@color/white" /> -->
            <corners android:radius="@dimen/user_gender_corners" />
            <padding
                android:bottom="1.5px"
                android:left="1.5px"
                android:right="1.5px"
                android:top="1.5px" />
            <gradient
                android:startColor="@color/white"
                android:endColor="@color/white"
                android:angle="270"/>

        </shape>
    </item>

</layer-list>

 <?xml version="1.0" encoding="UTF-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:top="1dp">
        <shape>
            <!-- <solid android:color="@color/black" /> -->
            <corners android:radius="@dimen/user_gender_corners" />
            <padding
                android:bottom="1.5px"
                android:left="1.5px"
                android:right="1.5px"
                android:top="1.5px" />

            <gradient
                android:startColor="@color/listitem_black"
                android:endColor="@color/feed_card_t2_endcolor"
                android:angle="270"/>
        </shape>
    </item>

    <item  android:bottom="6dp">
        <shape>
            <!-- <solid android:color="@color/white" /> -->
            <corners android:radius="@dimen/user_gender_corners" />
            <padding
                android:bottom="1.5px"
                android:left="1.5px"
                android:right="1.5px"
                android:top="1.5px" />
            <gradient
                android:startColor="@color/white"
                android:endColor="@color/white"
                android:angle="270"/>

        </shape>
    </item>

</layer-list>