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Just open in Android Studio the Currency.java class and look for the following code snippet

USD("USD") {
        @Override
        public String formatPrice(double price) {
            return String.format("%s %.2f", toString(), price);
        }
    };

Just copy this code snippet and then modify it to the desired currency. The example below, demonstrates how to add INR:

INR("INR") {
        @Override
        public String formatPrice(double price) {
            return String.format("%s %.2f", toString(), price);
        }
    };

Then, go to Settings.java and change this line in order to tell the app to use the newly created INR currency:

// *********** Units of measurement *********** //
    public static final Currency CURRENCY = Currency.INR;