在attrs.xml文件中添加
<declare-styleable name="Android">  
        <attr name="btn_visibility" format="string"/>
        <attr name="can_delete" format="boolean"/>
        <attr name="defaultValue" format="boolean"/>
        <attr name="dependency" format="string"/>
        <attr name="empty_wording" format="string"/>
        <attr name="key" format="string"/>
        <attr name="icon" format="reference"/>
        <attr name="layout" format="reference"/>
        <attr name="persistent" format="boolean"/>
          <attr name="summary" format="string"/>
          <attr name="title" format="string"/>
        <attr name="widgetLayout" format="reference"/>
       
</declare-styleable>
<declare-styleable name="mm">  
          <attr name="entryValues" format="reference"/>
        <attr name="entries" format="reference"/>
        <attr name="srcType" format="string"/>
</declare-styleable>

或者把
xmlns:android="http://schemas.android.com/apk/res-auto"
改成
xmlns:android="http://schemas.android.com/apk/res/android"