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It’s always a good practice to extract UI strings from your app code and keep them in an external file. Android makes this easy with a resources directory in each Android project.
If you created your project using the Android SDK
Tools (read Creating an
Android Project), the tools create a res/
directory in the top level of
the project. Within this res/
directory are subdirectories for various resource
types. There are also a few default files such as res/values/strings.xml
, which holds
your string values.
Create Locale Directories and String Files
To add support for more languages, create additional values
directories inside
res/
that include a hyphen and the ISO language code at the end of the
directory name. For example, values-es/
is the directory containing simple
resourcess for the Locales with the language code "es". Android loads the appropriate resources
according to the locale settings of the device at run time. For more information, see
Providing Alternative Resources.
Once you’ve decided on the languages you will support, create the resource subdirectories and string resource files. For example:
MyProject/ res/ values/ strings.xml values-es/ strings.xml values-fr/ strings.xml
Add the string values for each locale into the appropriate file.
At runtime, the Android system uses the appropriate set of string resources based on the locale currently set for the user's device.
For example, the following are some different string resource files for different languages.
English (default locale), /values/strings.xml
:
<?xml version="1.0" encoding="utf-8"?> <resources> <string name="title">My Application</string> <string name="hello_world">Hello World!</string> </resources>
Spanish, /values-es/strings.xml
:
<?xml version="1.0" encoding="utf-8"?> <resources> <string name="title">Mi Aplicación</string> <string name="hello_world">Hola Mundo!</string> </resources>
French, /values-fr/strings.xml
:
<?xml version="1.0" encoding="utf-8"?> <resources> <string name="title">Mon Application</string> <string name="hello_world">Bonjour le monde !</string> </resources>
Note: You can use the locale qualifier (or any configuration qualifer) on any resource type, such as if you want to provide localized versions of your bitmap drawable. For more information, see Localization.
Use the String Resources
You can reference your string resources in your source code and other XML files using the
resource name defined by the <string>
element's name
attribute.
In your source code, you can refer to a string resource with the syntax R.string.<string_name>
. There are a variety of methods that accept a string resource this
way.
For example:
// Get a string resource from your app'sResources
String hello =getResources()
.getString(R.string.hello_world); // Or supply a string resource to a method that requires a string TextView textView = new TextView(this); textView.setText(R.string.hello_world);
In other XML files, you can refer to a string resource with the syntax @string/<string_name>
whenever the XML attribute accepts a string value.
For example:
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hello_world" />