Android rich gradient drawable

android_gradient.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- ベースのグラデーション -->
    <item android:state_pressed="true">
        <shape android:shape="rectangle">
            <gradinent 
                android:angle="270" 
                android:endColor="#009FD9"
                android:startColor="#55CBF6" />
        </shape>
	</item>
	
    <item>
        <shape android:shape="rectangle">
            <gradient 
                android:angle="270" 
                android:endColor="#0096DB" 
                android:startColor="#57CCF7" />
        </shape>
    </item>
    <!-- 上の層 -->
    <!-- 下の暗くなってるとこ -->
    <item android:top="0dp">
        <shape android:shape="rectangle">
            <gradient 
                android:angle="270"
                android:startColor="#00025a7a"
                android:centerColor="#00025a7a"
                android:centerX="0.97"
                android:endColor="#FF025a7a"/>
        </shape>
    </item>
    
    <!-- 上の明るくなってるとこ -->
    <item android:top="0dp">
        <shape android:shape="rectangle">
            <gradient 
                android:angle="90"
                android:startColor="#00FFFFFF"
                android:centerColor="#00FFFFFF"
                android:centerX="0.97"
                android:endColor="#FEABE5FB"/>
        </shape>
    </item>
</layer-list>