Android的，从字符串获取资源ID？ [英] Android, getting resource ID from string?

问题描述

我需要通过一个资源ID的方法在我的课之一。它需要使用两个的参考点到并且还需要在字符串的ID。我应该如何最好地实现这一点？

I need to pass a resource ID to a method in one of my classes. It needs to use both the id that the reference points to and also it needs the string. How should I best achieve this?

例如：

R.drawable.icon

我需要得到这个整数ID，但我也需要访问字符串图标。

I need to get the integer ID of this, but I also need access to the string "icon".

这将是preferable如果所有我不得不传递给方法是图标字符串。

It would be preferable if all I had to pass to the method is the "icon" string.

推荐答案

@EboMike：我不知道 Resources.getIdentifier（）存在

@EboMike: I didn't know that Resources.getIdentifier() existed.

在我的项目中我用下面的code做到这一点：

In my projects I used the following code to do that:

public static int getResId(String resName, Class<?> c) {

    try {
        Field idField = c.getDeclaredField(resName);
        return idField.getInt(idField);
    } catch (Exception e) {
        e.printStackTrace();
        return -1;
    } 
}

这将是像这样使用：

It would be used like this:

getResId("icon", context, Drawable.class);

我刚刚发现了一个博客文章说， Resources.getIdentifier（）比使用反射像我一样慢。 检查出来。

I just found a blog post saying that Resources.getIdentifier() is slower than using reflection like I did. Check it out.

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