Question

I register alarms which I schedule to execute at given time, and it can be many alarms depending on the size of the scheduled list. But I have two questions which remains unclear to me:

1) How can I query the OS for the Pending Intents I registers? I need this for testing. The psudo code for what I want would be something like this:

List<PendingIntent> intentsInOS = context.getAllPendingIntentsOfType(AppConstants.INTENT_ALARM_SCHEDULE));

2) See the pending intent I create, I provide an action and extra data (the schedule id).

private Intent getSchedeuleIntent(Integer id) {

    Intent intent = new Intent(AppConstants.INTENT_ALARM_SCHEDULE);
    intent.putExtra(AppConstants.INTENT_ALARM_SCHEDULE_EXTRA, id);

    return intent;
}

But we also say that the intent have FLAG_CANCEL_CURRENT. Will it cancel all pending intents with same action, or does it have to both same action AND extra data?

PendingIntent pendingIntent = PendingIntent.getBroadcast(context.getApplicationContext(), 0, getSchedeuleIntent(schedule.id), PendingIntent.FLAG_CANCEL_CURRENT);

My code

@Override
public void run() {

    List<ScheduledLocation> schedules = dbManager.getScheduledLocations();
    if(schedules == null || schedules.isEmpty()){
        return;
    }

    AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
    //alarmManager.

    // we need to get the number of milliseconds from current time till next hour:minute the next day.
    for(ScheduledLocation schedule : schedules){

        long triggerAtMillis = DateUtils.millisecondsBetweenNowAndNext(now, schedule.hour, schedule.minute, schedule.day);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(context.getApplicationContext(), 0, getSchedeuleIntent(schedule.id), PendingIntent.FLAG_CANCEL_CURRENT);

        alarmManager.setInexactRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, triggerAtMillis, MILLISECONDS_IN_WEEK, pendingIntent);
    }

    // List<PendingIntent> intentsInOS = context.getAllPendingIntentsOfType(AppConstants.INTENT_ALARM_SCHEDULE));

}


private Intent getSchedeuleIntent(Integer id) {

    Intent intent = new Intent(AppConstants.INTENT_ALARM_SCHEDULE);
    intent.putExtra(AppConstants.INTENT_ALARM_SCHEDULE_EXTRA, id);

    return intent;
}

Answer 1

1 How can I query the OS for the Pending Intents I registers?

I’m not sure you can, but you can check if a specific PendingIntent is registered or not like this :

private boolean checkIfPendingIntentIsRegistered() {
    Intent intent = new Intent(context, RingReceiver.class);
    // Build the exact same pending intent you want to check.
    // Everything has to match except extras.
    return (PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_NO_CREATE) != null);
}

2 Will it cancel all pending intents with same action, or does it have to both same action AND extra data?

It will cancel all the PendingIntent that are resolved to be equal.

What exactly does equal means ?

The java doc of android says:

Determine if two intents are the same for the purposes of intent
resolution (filtering). That is, if their action, data, type, class,
and categories are the same. This does not compare any extra
data included in the intents.

You can read at the 7391 line here : https://android.googlesource.com/platform/frameworks/base/+/refs/heads/master/core/java/android/content/Intent.java

To sum up, all PendingIntent that are build exactly the same except extras will be cancelled.