Can I use a String Resource in a String Resource in string.xml?

Question

As the title says, my problem is that I don't know If/How I can use a String Resource in a String Resource in string.xml.

<string name="projectname">Include Test</string>
<string name="about">@string/projectname is to test if you can use a String Resource in a String Resource</string>

My question is if anyone knows if I can write

<string name="identifier">@string/other_identifier</string>

because Eclispe says

error: Error: No resource found that matches the given name (at 'other_identifier' with value '@string/other_identifier eingeben...').

This question is really a duplicate of this other question, and its accepted answer seems to be the best approach. Thanks to @Brian for pointing this out, — cybersam
– cybersam, Commented Jul 22, 2015 at 1:23

Che Jami · Accepted Answer · 2011-08-30 16:55:29Z

2

You are better off constructing these Strings at runtime. Combine different String resources together with the help of String.format.

Further details: http://developer.android.com/guide/topics/resources/string-resource.html#FormattingAndStyling

answered Aug 30, 2011 at 16:55

Che Jami

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2 Comments

hnzlmnn Over a year ago

But with String.format and combining the Stings at runtimeI have the problem that I want to use it in an help text. But if I want to write <string name="help4a_function">To use the function "@sting/a_function" you need to ...</string> I have to make 2 items "<string name="help4a_function_1">To use the function </string> and <string name="help4a_function_2"> you need to ...</string> and combine them with the contents of @sting/a_function. If I'm wrong please correct me!

Che Jami Over a year ago

You would have a string such as: <string name="help4a_function"> To use the function %1$s you need to ... </string> and assign the name of the function using String.format.

C0deAttack · Accepted Answer · 2011-08-30 15:38:36Z

2

No, I don't think that is possible.

answered Aug 30, 2011 at 15:38

C0deAttack

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1 Comment

hnzlmnn Over a year ago

thank you for the quick answer. hopefully such a function will be added soon!

Community · Accepted Answer · 2017-05-23 11:48:29Z

Edit: Actually this solution, using custom ENTITY entries is much nicer.

The following should work out of the box:

<string name="identifier">@string/other_identifier</string>

I just tried it with API Level 8 and it works fine. See also https://stackoverflow.com/a/6378421/786434

To be able to cross-reference strings within other words, you can create yourself a small helper method:

private static Pattern pattern = Pattern.compile("@string/(\\S+)");

public static String getString(Resources res, int stringID) {
String s = res.getString(stringID);

Matcher matcher = pattern.matcher(s);
while (matcher.find()) {
    try {
    final Field f = R.string.class.getDeclaredField(matcher.group(1));
    final int id = f.getInt(null);
    final String replace = res.getString(id);
    s = s.replaceAll(matcher.group(), replace);

    } catch (SecurityException ignore) {
    } catch (NoSuchFieldException ignore) {
    } catch (IllegalArgumentException ignore) {
    } catch (IllegalAccessException ignore) {
    }
}

return s;
}

Community · Accepted Answer · 2017-05-23 12:15:06Z

0

A nice way to insert a frequently used string (e.g. app name) in xml without using Java code here:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE resources [
<!ENTITY appname "MyAppName">
<!ENTITY author "MrGreen">
]>

<resources>
    <string name="app_name">&appname;</string>
    <string name="description">The &appname; app was created by &author;</string>
</resources>

edited May 23, 2017 at 12:15

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answered Oct 5, 2016 at 9:37

Beeing Jk

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Comments

César Muñoz · Accepted Answer · 2022-05-20 12:59:18Z

0

Yes you can :) Not natively though, but you can use this small library that allows you to resolve these placeholders at buildtime, so you won't have to add any Java/Kotlin code to make it work.

Based on your example, you'd have to set up your strings like this:

<string name="projectname">Include Test</string>
<string name="about">${projectname} is to test if you can use a String Resource in a String Resource</string>

And then the plugin will take care of creating the following:

<!-- Auto generated during compilation -->
<string name="about">Include Test is to test if you can use a String Resource in a String Resource</string>

More info here: https://github.com/LikeTheSalad/android-stem

Disclaimer: I'm the author of that library.

edited May 20, 2022 at 12:59

answered Oct 24, 2019 at 12:37

César Muñoz

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