CODEWITHSUNDEEP
androidandroid-pendingintent
marina
marina

Reputation: 1680

Where are stored PendingIntents? Big trap of using

In my project i have tried out some possibilities and limitations of PendingIntent

So i have created some notification, that opens an activity by tapping

Intent intent = new Intent(this, NotificationActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
intent.putExtra(Constants.INTENT_ITEM_NAME, "ItemName");
intent.putExtra(Constants.INTENT_ITEM_ID, itemId);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);

NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, CHANNEL_ID)
// properties set
;

notificationManager.notify(new Random().nextInt(10), notificationBuilder.build());

at begin was everithing good, until i have placed other item to show in NotificationActivity by tap on notification.

Here starts problems: in NotificationActivity was still showed previous item.

After some search it could be solved with:

PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

BUT: if i have in same time many notifications, then i always see only last item, PendingIntent was created for.

Second parameter of getActivity is requestCode. So when i update solution to

PendingIntent pendingIntent = PendingIntent.getActivity(this, new Random().nextInt(1000), intent, PendingIntent.FLAG_UPDATE_CURRENT);

Then also many items are supported, and if for some reason the random makes me same numbers, the content in NotificationActivity will be the same.

So to 99% the solution is good, yes? NO

Again to first approach

PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);

If i set new extras for intent -> old extras will be readed.

In other words: by new Random().nextInt(1000) somewhere in the system of android device will be stored till 1000 PendingIntents for one of activities i have forever

So here are the questions:

With How to clear it, i mean a way to remove all currently maked PendingIntents with some Random as requestCode, so that in clear way with only one notification at time i could use

PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);

with different items

Upvotes: 1

Views: 81

Answers (1)

David Wasser
David Wasser

Reputation: 95578

PendingIntents are stored in non-persistent storage. When the device restarts, they are all gone.

Also, if you create a PendingIntent and put it in a Notification, once the Notification is gone (dismissed, opened, etc.) the PendingIntent is no longer in use and will be deleted.

Generally you should not use random numbers for the requestCode as this is no guarantee of uniqueness. You need to find a way to make your PendingIntent unique if you want to have many of them existing in parallel.

Upvotes: 1

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