Code only works on desktop

package com.philipborg.aol;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.Properties;

import com.badlogic.gdx.Gdx;

public class Settings {
	public static boolean soundEnabled = true;
	public final static String file = "AOL/settings.txt";
	static Properties prop = new Properties();

	public static void load() {
		BufferedReader in = null;
		try {
			in = new BufferedReader(new InputStreamReader(Gdx.files.external(
					file).read()));
			prop.load(in);
			soundEnabled = Boolean.parseBoolean(prop.getProperty(
					"soundEnabled", "true"));
			Gdx.app.log("Settings - load", "Loaded settings");

		} catch (Throwable e) {
			// Switches to default
			Gdx.app.log("Settings - load", "Could not load settings");
		} finally {
			try {
				if (in != null)
					in.close();
				save();
			} catch (IOException e) {

			}
		}
	}

	public static void save() {
		BufferedWriter out = null;
		try {
			out = new BufferedWriter(new OutputStreamWriter(Gdx.files.external(
					file).write(false)));
			prop.setProperty("soundEnabled", Boolean.toString(soundEnabled));
			prop.store(out, "AOL SETTINGS");
			out.close();
		} catch (Throwable e) {
		} finally {
			try {
				if (out != null)
					out.close();
			} catch (IOException e) {
			}
		}
	}

}

This LibGDX code somehow only works on desktop. I want it to work on Android as well since I do not really care about HTML support.This code is my full settings class and is in it's native form. What do I need to do to make it work on Android?