<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_pressed="false">
        <shape>
            <corners android:radius="@dimen/dp_15" />
            <gradient android:angle="90" android:endColor="#eef2fe" android:startColor="#bed5fe" />
        </shape>
    </item>

    <item android:state_pressed="true">
        <shape>
            <corners android:radius="@dimen/dp_15" />
            <!-- 点击按钮时候改变背景色50% -->
            <solid android:color="#80466FB8" />
        </shape>
    </item>
</selector>