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

To provide proper navigation.

1) When the app is launched by App icon (Normal Flow)

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2) When the app is launched by some Notification

General flow of navigation in your app is MainActivity->DetailActivity

But sometimes a Notification might directly open the DetailActivity. In this case, pressing the back button in DetailActivity will not lead you to the `MainActivity. It's an EXPECTED BEHAVIOR. However, you can modify this if you want to navigate back to MainActivity.

How do I do it?

1) Add android:parentActivityName="com.example.myApp.MainActivity in your Activity

This feature was added in Android 4.1. So if you want to target older devices. Add a meta-tag ALSO.

2) Use TaskStackBuilder to create a Pending Intent.

public PendingIntent getPendingIntent(Intent intent){

    TaskStackBuilder taskStackBuilder = TaskStackBuilder.create(this);
    taskStackBuilder.addNextIntentWithParentStack(intent);
    PendingIntent pendingIntent = taskStackBuilder.getPendingIntent(0,PendingIntent.FLAG_UPDATE_CURRENT);

}

Now pass this Pending intent to create Notifications.