超链接：https://www.cnblogs.com/tinyphp/p/3831231.html
代码：
<Button
android:id="@+id/btn_no"
android:layout_width="60dp"
android:layout_height="40dp"
android:background="@drawable/bg_password_select"
android:gravity="center"
android:text="取消"
android:textColor="#9c9c9c"
/>
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" android:drawable="@drawable/play_button"></item>
<item android:state_focused="true" android:drawable="@drawable/play_button"></item>
<item android:drawable="@drawable/button"></item>
</selector>
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
<solid android:color="#339c9c9c"/>
</shape>
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
<solid android:color="@null"/>
</shape>