If you are writing an app, that uses a string containing numbers, for example:

Deleted 1 message

Deleted 2 messages

You could manually create two different strings, and show either one by using an if/else, depending on the number variable.

However, as you start internationalizing your app, by adding more translations, this quickly gets out of hand!

Using Plurals

Luckily, theres a great solution for this. In Android, you can use something called "plurals".

You can use plurals in their own resource file, or just add them to the strings.xml file. I like to have them in my strings.xml file, so I can keep track of all strings in one place, and easily translate them to other locales.

So, in strings.xml, add a plurals element, like below:

<?xml version="1.0" encoding="utf-8"?>

    <plurals name="numberOfDeletedItems">
        <item quantity="one">Deleted %d message</item>
        <item quantity="other">Deleted %d messages</item>

    <!-- other strings... -->

You can then add the same element to your other strings.xml files, to get them translated.

To use the plural string in your app, you get it like this:

int deletedItemCount = doSomeAction();

String formattedText = getResources()
deletedItemCount, deletedItemCount);

Depending on the deletedItemCount variable, you will now get a formatted string, with the correct pluralization.

There are several different values for quantity, for more information, and tips check out the documentation.