AlarmReceiver.java

package com.plusonelabs.calendar;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

import java.util.Calendar;

public class AlarmReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        EventAppWidgetProvider.updateAllWidgets(context);
        EventAppWidgetProvider.updateEventList(context);
        scheduleAlarm(context);
    }

    public static void scheduleAlarm(Context context) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MILLISECOND, 0);
        calendar.add(Calendar.DAY_OF_MONTH, 1);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, new Intent(context,
                AlarmReceiver.class), PendingIntent.FLAG_UPDATE_CURRENT);
        AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        am.set(AlarmManager.RTC, calendar.getTimeInMillis(), pendingIntent);
    }

}