How to send parameters from a notification-click to an activity?

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Take a look at this guide (creating a notification) and to samples ApiDemos “StatusBarNotifications” and “NotificationDisplay”.

For managing if the activity is already running you have two ways:

  1. Add FLAG_ACTIVITY_SINGLE_TOP flag to the Intent when launching the activity, and then in the activity class implement onNewIntent(Intent intent) event handler, that way you can access the new intent that was called for the activity (which is not the same as just calling getIntent(), this will always return the first Intent that launched your activity.

  2. Same as number one, but instead of adding a flag to the Intent you must add “singleTop” in your activity AndroidManifest.xml.

If you use intent extras, remeber to call PendingIntent.getActivity() with the flag PendingIntent.FLAG_UPDATE_CURRENT, otherwise the same extras will be reused for every notification.

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