xml设置渐变+阴影的背景

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btn_simpale_normal.xml

<?xmlversion ="1.0" encoding="utf-8"?><layer-list xmlns:android="http://schemas.android.com/apk/res/android" >    <item>        <shape>            <corners android:radius="25dp" />            <gradient                 android:startColor="#999999"                android:angle="90"                android:endColor="#E4E4E4"                android:type="linear" />        </shape>    </item>    <item        android:bottom="3px"        android:left="1px"        android:right="2px"        android:top="1px">        <shape>            <corners android:radius="25dp" />            <gradient                android:angle="90"                android:endColor="#FFFFFF"                android:startColor="#cccccc"                android:type="linear" />        </shape>    </item>    </layer-list>

btn_simpale_pressed.xml

<?xmlversion ="1.0" encoding="utf-8"?><layer-list xmlns:android="http://schemas.android.com/apk/res/android" >    <item>        <shape>            <corners android:radius="25dp" />            <gradient                 android:startColor="#999999"                android:angle="90"                android:endColor="#E4E4E4"                android:type="linear" />        </shape>    </item>    <item        android:bottom="1px"        android:left="1px"        android:right="1px"        android:top="1px">        <shape>            <corners android:radius="25dp" />            <gradient                android:angle="90"                android:endColor="#cccccc"                android:startColor="#FFFFFF"                android:type="linear" />        </shape>    </item>    </layer-list>

select_button_simple.xml

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android" >    <item android:state_pressed="true" android:drawable="@drawable/btn_simpale_pressed"></item><item android:drawable="@drawable/btn_simpale_normal"></item></selector>