Using resources for localization
How to create default resources?
Put the app's default text in res/values/strings.xml.
The text strings in res/values/strings.xml should use the default language, which is the language that you expect most of your app's users to speak.
The default resource set must also include any default drawables and layouts, and can include other types of resources such as animations:
v res/drawable/(required directory holding at least one graphic file, for the app's icon on Google Play)
v res/layout/ (required directory holding an XML file that defines the default layout)
v res/anim/ (required if you have any res/anim-<qualifiers> folders)
v res/xml/ (required if you have any res/xml-<qualifiers> folders)
v res/raw/ (required if you have any res/raw-<qualifiers> folders)
Tip: In your code, examine each reference to an Android resource. Make sure that a default resource is defined for each one. Also make sure that the default string file is complete: A localized string file can contain a subset of the strings, but the default string file must contain them all.