simple util class to run periodic tasks on android

PeriodicTask.java

package gturedi.sample;

import android.content.Context;
import android.content.SharedPreferences;

public class PeriodicTask {

    private static final int ONE_DAY_IN_MILLIS = 1000 * 60 * 60 * 24;

    public static void run(final Context context, Runnable runnable) {
        run(context, "task", 2, runnable);
    }

    public static void run(final Context context, String taskName, int periodInDays, Runnable runnable) {
        SharedPreferences preferences = context.getSharedPreferences(taskName, Context.MODE_PRIVATE);
        long lastTime = preferences.getLong(taskName, 0);
        long now = System.currentTimeMillis();

        int diff = (int) ((now - lastTime) / ONE_DAY_IN_MILLIS);
        if (diff >= periodInDays) {
            preferences.edit().putLong(taskName, now).commit();
            new Thread(runnable).start();
        }
    }

}