TypedArray的getResourceId方法 [英] getResourceId method of TypedArray

问题描述

我正在阅读有关 getResourceId()方法.它说:

I am reading docs about getResourceId() method. It says that:

检索索引处属性的资源标识符.笔记当整个TypedArray对象被解析时，该属性资源被解析被检索.结果，此函数将返回资源找到的最终资源值的标识符，不一定属性指定的原始资源.

Retrieves the resource identifier for the attribute at index. Note that attribute resource as resolved when the overall TypedArray object is retrieved. As a result, this function will return the resource identifier of the final resource value that was found, not necessarily the original resource that was specified by the attribute.

所以

• 第一段很清楚:

检索索引处属性的资源标识符.

Retrieves the resource identifier for the attribute at index.

• 第二个也很清楚:

请注意，当整体TypedArray解析为属性资源时对象被检索.

Note that attribute resource as resolved when the overall TypedArray object is retrieved.

• 但这3段是什么意思? 为什么可以返回 不一定是原始资源ID ?

因此，此函数将返回找到的最终资源价值，不一定是原始价值属性指定的资源.

As a result, this function will return the resource identifier of the final resource value that was found, not necessarily the original resource that was specified by the attribute.

推荐答案

从文档:

TypedArray obtainStyledAttributes (AttributeSet set, 
                int[] attrs, 
                int defStyleAttr, 
                int defStyleRes)

....

确定特定属性的最终值时，有四项投入发挥作用:

When determining the final value of a particular attribute, there are four inputs that come into play:

1. 给定AttributeSet中的任何属性值.
2. 在AttributeSet中指定的样式资源(名为样式").
3. defStyleAttr和defStyleRes指定的默认样式
4. 此主题的基本值.

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