安卓：使用变量名访问string.xml [英] Android: Accessing string.xml using variable name

问题描述

我想显示一条消息，根据提示我在程序的其他部分接收用户。可以有若干提示＆安培的;它们被存储在一个枚举

I want to display a message to the user depending upon a prompt I receive from another part of the program. There can be a number of prompts & they are stored in an enum.

这些是我的提示：

Defs.java

public enum Prompt
{
    PromptA,
    PromptB,
    PromptC,
}

我有存储在资源上，这些线路的外向化字符串：

I have the externalized strings stored in resources on these lines:

RES /价值/ strings.xml中

<string name="PromptA">Error in execution</string>
<string name="PromptB">Process completed successfully</string>
<string name="PromptC">Please try again</string>

现在在我的主要活动屏幕的方法是调用其他部分：

Now in my main Activity screen a method is called by some other part:

public void showPrompt(Prompt prompt) {
    String message = getString(R.string.<**what-do-I-put-here?**>);
    //show a dialog box with message
}

我知道这与一个巨大的if-else块来完成（有吨在实际应用中提示）或switch语句。 这将是十分可怕的。

I know this can be done with a huge if-else block (there are tons of prompts in the actual application) or a switch statement. It will be really ugly.

有没有更好的方式来做到这一点？

Is there a better way to do this?

推荐答案

请参阅 Resources.getIdentifier ：<一href="http://developer.android.com/reference/android/content/res/Resources.html#getIdentifier%28java.lang.String,%20java.lang.String,%20java.lang.String%29">http://developer.android.com/reference/android/content/res/Resources.html#getIdentifier%28java.lang.String,%20java.lang.String,%20java.lang.String%29 。你可以尝试这样的：

See Resources.getIdentifier: http://developer.android.com/reference/android/content/res/Resources.html#getIdentifier%28java.lang.String,%20java.lang.String,%20java.lang.String%29 . You can try something like this:

public void showPrompt(Prompt prompt, String label) {
    String message = (String) getResources().getText(getResources().getIdentifier(label, "string", null));
    //show a dialog box with message
}

尝试了这一点，看看是什么一样对你。

Try that out and see what that does for you.

编辑：MEH。试试这个吧。

meh. Try this instead.

public void showPrompt(Prompt prompt, String label) {
    String message = (String) getResources().getText(getResources().getIdentifier(label, "string", "<application package class>"));
    //show a dialog box with message
}

原来，你必须指定你的包标识符（所以如果你的Andr​​oidManifest.xml中有 com.blah.blah.blah 作为包放进了第三个参数。

Turns out you have to specify the your package identifier (so if your AndroidManifest.xml has com.blah.blah.blah as the Package put that in the third parameter.

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