xml不同状态的显示

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

    <item android:state_enabled="false"><shape android:shape="rectangle">
            <solid android:color="#90fafafa" />

            <corners android:radius="5dp" />
        </shape></item>
    <item android:state_pressed="true"><shape android:shape="rectangle">
            <solid android:color="#90ffffff" />

            <corners android:radius="5dp" />
        </shape></item>
    <item android:state_focused="false" android:state_pressed="false">
        <shape android:shape="rectangle">
            <solid android:color="@color/white_title" />

            <corners android:radius="5dp" />
        </shape></item>

</selector>