android button的selector

实现按钮的selector

<?xml version="1.0" encoding="utf-8"?>

<selector xmlns:android="http://schemas.android.com/apk/res/android">

 <item android:drawable="@drawable/common_topbar_route_bus_pressed" android:state_pressed="true"/>

    <item android:drawable="@drawable/common_topbar_route_bus_pressed" android:state_selected="true"/>

    <item android:drawable="@drawable/common_topbar_route_bus_normal" android:state_enabled="true"/>

    <item android:drawable="@drawable/common_topbar_route_bus_normal" />

</selector>