sheishuoAPP/app/res/drawable/chat_room_back_arrow_selector.xml

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