Home / Questions / 31390
Accepted
Francisco Romero
Asked: 2020-11-03 11:30:07 +0800 CST 2020-11-03 11:30:07 +0800 CST

How to create an alarm on Android?

  • 772

I am trying to create an alarm in Android when a button is clicked for the same day that the button is given but for a specific time.

The code I have is the following:

AlarmManager alarma = (AlarmManager) getSystemService(ALARM_SERVICE);

Calendar cal= Calendar.getInstance();

cal.set(Calendar.MONTH,cal.get(Calendar.MONTH));
cal.set(Calendar.YEAR,cal.get(Calendar.YEAR));
cal.set(Calendar.DAY_OF_MONTH,cal.get(Calendar.DATE));
cal.set(Calendar.HOUR_OF_DAY,20);
cal.set(Calendar.MINUTE,30);

alarma.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(),pendingIntent);

However, I have a problem when setting the parameters of the alarm. I have the first two parameters set, however I can't get the third one, the pendingIntent.

Honestly, reading the documentation on this method in the official Android documentation, it has not been very clear to me what I should place in the third parameter and the examples that I have seen on the Internet have helped me to mess up a little more than help me.

How could I set the alarm correctly?

Thank you very much.

android

2 Answers

  1. Best Answer

    This code is to activate an Alarm, just change the values ​​for yours.

    private AlarmManager alarmMgr;
private PendingIntent alarmIntent;

alarmMgr = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(context, AlarmReceiver.class);
alarmIntent = PendingIntent.getBroadcast(context, 0, intent, 0);

// Alarma a las 8:30 a.m.
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.set(Calendar.HOUR_OF_DAY, 8);
calendar.set(Calendar.MINUTE, 30);

// Repeticiones en intervalos de 20 minutos
alarmMgr.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
        1000 * 60 * 20, alarmIntent);

    If you want a more explicit explanation read this .

    • 4

  2. It all depends on what you want to do when the alarm runs. It may be that you want to open an Activity, or send a broadcast intent to receive it in a Broadcast Receiver, or something else

    To open an activity

    Intent intent = new Intent(getApplicationContext(), ActivityToLaunch.class);
PendingIntent pi = PendingIntent.getActivity(this, 0, intent, 0);

    To send a BroadcastIntent

    Intent intent = new Intent();
intent.setAction("com.example.app.ACTION");
PendingIntent pI = PendingIntent.getBroadcast(getActivityContext(), 0, intent, 0);

    The pending Intent has many uses, I leave you the PendingIntent documentation so you can investigate what else can be done

    https://developer.android.com/reference/android/app/PendingIntent.html

    • 0