How to use Android AlarmManager with small intervals like 1 minute?

Question

I want to make some external service monitor and be notified on problems as fast as possible.

I tried to set up AlarmManager with 1-2 minutes interval,

Answer 1

Posting a code snippet that we have used.Please modify as per your requirement. We use it for every 15 seconds and it works.

public class AlarmManagerBroadcastReceiver extends BroadcastReceiver  
{
private static final int _REFRESH_INTERVAL = 60 * 1; // 1 minutes
// Alarm id
    private static final int ALARM_ID = 102; // This can be any random integer.

    PendingIntent pi = null;
    AlarmManager am= null;

@Override
    public void onReceive(Context context, Intent intent) 
    {
        /* All actions to be handled here.. */
        }


    // This is to initialize the alarmmanager and the pending intent. It is done in separate method because, the same alarmmanager and
    // pending intent instance should be used for setting and cancelling the alarm.

    public void SetContext(Context context)
    {
        this.context = context;
        am=(AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        Intent intent = new Intent(context, AlarmManagerBroadcastReceiver.class);
        pi = PendingIntent.getBroadcast(context, ALARM_ID, intent, PendingIntent.FLAG_UPDATE_CURRENT);
    }

    // Setting the alarm to call onRecieve every _REFRESH_INTERVAL seconds
    public void SetAlarm()
    {
        // am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), 1000 * _REFRESH_INTERVAL , pi);
        try
        {
            am.cancel(pi);
        }catch (Exception ignored){}
        am.setRepeating(AlarmManager.RTC_WAKEUP, SystemClock.elapsedRealtime(), 1000 * _REFRESH_INTERVAL , pi);
    }

    // Cancel the alarm.
    public void CancelAlarm()
    {
        am.cancel(pi);
    }

}