How to give button or recyclerview item's style programmatically using style attribute in android

Question

I defined two attributes for button style like

<!-- attrs.xml-->
<declare-styleable name="MyCustomButton">
    <attr name="rectangleCustomButtonStatus1" format="reference" />
    <attr name="rectangleCustomButtonStatus2" format="reference" />
</declare-styleable>

<!-- styles.xml -->
 <style name="AppTheme">
       <item name="rectangleCustomButtonStatus1">@style/GoldButtonStyle</item>
       <item name="rectangleCustomButtonStatus2">@style/WhiteButtonStyle</item>
       ....
 </style>

GoldButtonStyle and WhiteButtonStyle i defined in style.xml itself.

now i am applying above defined attribute syle in xml like

 <Button
  style="?attr/rectangleCustomButtonStatus1"
  ..... />

I am using Recyclerview, Recyclerview item has one button. Button text will be changed based on status like pending, completed. I want to set attribute style like if status is pending then use rectangleCustomButtonStatus1 and if status is completed then use rectangleCustomButtonStatus2.

So how can i give style attribute programmatically? same thing i have to do for recyclerview itemview's item. so how can i achieve this?