在Switch中使用来自资源XML的字符串? [英] Using string from resource XML in Switch?

问题描述

这里是Android的新功能，如果这是一个简单的问题，我深表歉意.

New to Android here, so I apologize if this is a simplistic question.

我正在尝试使用基于XML中字符串资源的开关.看起来像这样:

I am attempting to use a switch based on string resources in my XML. It would look something like this:

switch (myStringVariable) {
    case getResources().getString(R.string.first_string):
         break;
    case getResources().getString(R.string.second_string):
         break;
    case getResources().getString(R.string.third_string):
         break;
    default:
         break;
}

不幸的是，这行不通.我得到的错误是需要常量表达式".

Unfortunately, this won't work. The error that I get is "Constant expression required".

是否有一种半优雅的方法来执行此操作，而不必执行诸如创建3个String对象并将字符串资源分配给每个对象的操作?我觉得我缺少明显的东西，所以任何帮助都会很棒！

Is there a semi-elegant way to go about this, without having to do something like create 3 String objects and assign the string resources to each object? I feel like I'm missing something obvious, so any assistance would be great!

谢谢:)

推荐答案

首先，Android所基于的Java版本不支持String开关语句，因此通常必须使用if/else块代替

Well, first of all, the version of Java that Android is based on does not support String switch statements, so generally you have to use if/else blocks instead.

编辑:如果您使用的是JDK 1.7和更高版本，则支持字符串切换语句.

String switch statements are supported if you use JDK 1.7 and later

我不确定您的用例是什么，但是如果您的资源ID为myStringVariable(即int)，则可以进行切换:

I'm not sure what your use case is, but if you have the resource ID of myStringVariable, which is an int, you can do a switch over that:

switch (myStringResId) {
case R.string.first_string:
     break;
case R.string.second_string:
     break;
case R.string.third_string:
     break;
default:
     break;
}

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