关于attrs.xml文件属性集的问题

Question

在res/values文件下创建attrs.xml文件，代码如下：
<?xml version="1.0" encoding="utf-8"?>

<declare-styleable name="Circle">
    <attr name="circleBackground" format="integer" />
    <attr name="firstChildPosition">
        <enum name="East" value="0" />
        <enum name="South" value="90" />
        <enum name="West" value="180" />
        <enum name="North" value="270" />
    </attr>
    <attr name="rotateToCenter" format="boolean" />
    <attr name="isRotating" format="boolean" />
</declare-styleable>
<declare-styleable name="CircleImageView">
    <attr name="name" format="string" />
</declare-styleable>

在
if(attrs != null){
TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.CircleImageView);
}中报错，CircleImageView cannot be resolved or is not a field

    怎么回事，怎么改

Answer 1

 <resources>  --加上这个
<declare-styleable name="Circle">
    <attr name="circleBackground" format="integer" />
    <attr name="firstChildPosition">
        <enum name="East" value="0" />
        <enum name="South" value="90" />
        <enum name="West" value="180" />
        <enum name="North" value="270" />
    </attr>
    <attr name="rotateToCenter" format="boolean" />
    <attr name="isRotating" format="boolean" />
</declare-styleable>
<declare-styleable name="CircleImageView">
    <attr name="name" format="string" />
</declare-styleable>
</resources>