attribute 的名字重复的问题

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如果从单独开发app的话，可能不会遇到多个自定义类的attribute 的名字重复的问题。但是如果是团队合作开发的话，可能会碰到这样的问题，A和B自定义的两个类都用了同一个名字来定义属性，这时系统会报出警告，Attribute "xxx" has already been defined. A和B又都不想修改自己的名字，这时就很头痛。

下面举个例子，在values文件夹下定义一个上面的attrs.xml的文件，eclipse即会报错：Attribute "icon" has already been defined。因为在PreferenceHeader, Preference两个属性集里定义了两个相同的属性。

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<? xml version = "1.0"encoding = "utf-8"?>
< resources >
     < declare-styleable name= "PreferenceHeader">
        <!-- Identifier value forthe header. -->
        < attr name= "id"format = "integer"/>
        < attr name= "icon"format = "integer"/>
        <!-- The fragment that is displayed when the user selects thisitem. -->
    </declare-styleable >
    < declare-styleable name= "Preference">
        < attr name= "icon"format = "integer"/>
        <!-- The key to store the Preference value. -->
        < attr name= "key"format = "string"/>
    </declare-styleable >
</ resources >

解决方案：

1.在xml文件里前面先声明属性

2.然后在属性集合里引用声明的属性即可。

以上面的文件为例来修改，如下：

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<? xml version = "1.0"encoding = "utf-8"?>
< resources >
     < attr name = "icon"format = "integer"/>
     < declare-styleable name= "PreferenceHeader">
        <!-- Identifier value forthe header. -->
        < attr name= "id"format = "integer"/>
        < attr name= "icon"/>
        <!-- The fragment that is displayed when the user selects thisitem. -->
    </declare-styleable >
    < declare-styleable name= "Preference">
        < attr name= "icon" />
        <!-- The key to store the Preference value. -->
        < attr name= "key"format = "string"/>
    </declare-styleable >
</ resources >

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