In your project, add the directory "values-es" to the directory "res". Then put the new file "string.xml" in this directory. Now you should have the file "string.xml" in the directory "values" and the file "string.xml" in the directory "values-es".
EACH - :
"string.xml" "values":
<resources>
<string name="toto">The value in the default language</string>
</resources>
"string.xml" "values-es" :
<resources>
<string name="toto">The value in spanish</string>
</resources>
, , "toto", , .