How to use C-style printf format strings to include variables in strings.xml?

Variables can be included in the strings defined in strings.xml using the C-style printf '%' syntax. This is because getString passes the string through java.util.Formatter.

In the example above, getString substitutes %d for the integer 10 in the string message.

/ In strings.xml

<string name="unread_messages">You have %d unread messages</string>

// In Java code

String message = getString(R.string.unread_messages, 10);