public class ScreenPreferences {
	
	@Configuration // implies that the preference name in the SharedPreferences store is "brightness"
	private String brightness;

	@Configuration("length") // implies that the preference name in the SharedPreferences store is "length"
	private Integer scale;

	public String getBrightness() {
		return brightness; 
	}

	public Integer getScale() {
		return scale;
	}

}

SharedPreferences prefs = this.getSharedPreferences("org.constretto.app", Context.MODE_PRIVATE);
ConstrettoConfiguration conf = ConstrettoAndroidBuilder.createConfigurationForSharedPreferences(prefs);

final ScreenPreferences screenPreferences = configuration.as(ScreenPreferences.class);