selector_dialog_btn.xml

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

    <!-- Button正常状态下的背景 -->
    <item android:drawable="@drawable/shape_dialog_btn_normal_bg"  android:state_pressed="false" />
    <!-- Button按下时的背景 -->
    <item android:drawable="@drawable/shape_dialog_btn_pressed_bg" android:state_pressed="true"/>
</selector>