Java intent from notification with extra to activity

To send an Intent from a notification with extra data to an activity on Android, you can use the following code:

Intent i = new Intent(this, TargetActivity.class);
i.putExtra("key", "value");
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, i, 0);

NotificationCompat.Builder builder = new NotificationCompat.Builder(this, CHANNEL_ID)
        .setSmallIcon(R.drawable.notification_icon)
        .setContentTitle("Title")
        .setContentText("Content")
        .setContentIntent(pendingIntent)
        .setAutoCancel(true);

NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);
notificationManager.notify(NOTIFICATION_ID, builder.build());

In this example, TargetActivity is the name of the activity that you want to start when the notification is clicked. The Intent sets the extra data using the putExtra method and sets the flags to FLAG_ACTIVITY_NEW_TASK and FLAG_ACTIVITY_CLEAR_TASK, which will create a new task and clear any existing tasks when the activity is launched.

The Intent is then wrapped in a PendingIntent using the getActivity method, which allows it to be used as the content intent for the notification.

The notification is built using the NotificationCompat.Builder class and set with a small icon, title, and text. The content intent is set using the setContentIntent method, and the notification is set to be automatically canceled when clicked using the setAutoCancel method.

Finally, the notification is displayed using the NotificationManagerCompat class.

For more information on using Intents with notifications in Android, you can refer to the Android documentation.