Why do we use the TaskStackBuilder?

Question

Why do we use the TaskStackBuilder when creating a notification? I do not get the logic behind it.

Can someone please explain.

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Answer 1

The other answers explained it nicely: you use a pending intent to send a user into a detail activity, then you want them to use the back button to go back to the main activity. An alternative way to set this is

Intent detailIntentForToday = new Intent(context, DetailActivity.class);
TaskStackBuilder taskStackBuilder = TaskStackBuilder.create(context);
taskStackBuilder.addNextIntentWithParentStack(detailIntentForToday);
PendingIntent resultPendingIntent = taskStackBuilder
    .getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);
resultPendingIntent.send();

For this, you also need to set

android:parentActivityName=".MainActivity"

for the DetailActivity in AndroidManifest.xml.