ネストされた文字列を再帰的に解決する独自のロジックを使用できます。
/**
* Regex that matches a resource string such as <code>@string/a-b_c1</code>.
*/
private static final String REGEX_RESOURCE_STRING = "@string/([A-Za-z0-9-_]*)";
/** Name of the resource type "string" as in <code>@string/...</code> */
private static final String DEF_TYPE_STRING = "string";
/**
* Recursively replaces resources such as <code>@string/abc</code> with
* their localized values from the app's resource strings (e.g.
* <code>strings.xml</code>) within a <code>source</code> string.
*
* Also works recursively, that is, when a resource contains another
* resource that contains another resource, etc.
*
* @param source
* @return <code>source</code> with replaced resources (if they exist)
*/
public static String replaceResourceStrings(Context context, String source) {
// Recursively resolve strings
Pattern p = Pattern.compile(REGEX_RESOURCE_STRING);
Matcher m = p.matcher(source);
StringBuffer sb = new StringBuffer();
while (m.find()) {
String stringFromResources = getStringByName(context, m.group(1));
if (stringFromResources == null) {
Log.w(Constants.LOG,
"No String resource found for ID \"" + m.group(1)
+ "\" while inserting resources");
/*
* No need to try to load from defaults, android is trying that
* for us. If we're here, the resource does not exist. Just
* return its ID.
*/
stringFromResources = m.group(1);
}
m.appendReplacement(sb, // Recurse
replaceResourceStrings(context, stringFromResources));
}
m.appendTail(sb);
return sb.toString();
}
/**
* Returns the string value of a string resource (e.g. defined in
* <code>values.xml</code>).
*
* @param name
* @return the value of the string resource or <code>null</code> if no
* resource found for id
*/
public static String getStringByName(Context context, String name) {
int resourceId = getResourceId(context, DEF_TYPE_STRING, name);
if (resourceId != 0) {
return context.getString(resourceId);
} else {
return null;
}
}
/**
* Finds the numeric id of a string resource (e.g. defined in
* <code>values.xml</code>).
*
* @param defType
* Optional default resource type to find, if "type/" is not
* included in the name. Can be null to require an explicit type.
*
* @param name
* the name of the desired resource
* @return the associated resource identifier. Returns 0 if no such resource
* was found. (0 is not a valid resource ID.)
*/
private static int getResourceId(Context context, String defType,
String name) {
return context.getResources().getIdentifier(name, defType,
context.getPackageName());
}
Activityたとえば、から、次のように呼び出します
replaceResourceStrings(this, getString(R.string.message_text));