AlarmManager when the phone is turned off - ANDROID

I'm doing an alarm System but i've a problem when the phone is turned off.. The alarm doesn't work..

I'm setting de alarm as follows:

    public void doIntents(Context context, long milis, Tratam trat){
    cal=Calendar.getInstance();
    alarmManager = (AlarmManager) context.getSystemService(Service.ALARM_SERVICE);

    cal.setTimeInMillis(milis);
    Intent intent = new Intent(context, OnAlarmReceiver.class);


    pendingIntent = PendingIntent.getBroadcast(context, trat.getId(), intent, PendingIntent.FLAG_UPDATE_CURRENT);
    alarmManager.set(AlarmManager.RTC_WAKEUP,milis ,pendingIntent);

}

The Alarm works Ok when the phone is turned on..

What can I do?

Thank you!

Yea, the problem is your app isn't running when the phone restarts. You'll need to register a BroadcastReceiver that can receive the BOOT_COMPLETED message so it receives a message when the phone reboots. Then in the BroadcastReceiver you can either reschedule those alarms or whatever. But I don't think there's anything you can do about making your alarm trigger when the phone is off..(e.g. making the phone turn on)

<receiver android:name="MyBootReceiver"
        android:enabled="true"
        android:exported="true"
        android:label="BootReceiver">
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED"></action>

        </intent-filter>
    </receiver>