task affinity for singleInstance activity?

Question

I want to know what is the default task affinity for singleInstance activity?

Since each singleInstance Activity opens up as root activity in a new task. and there is no need to declare android:taskAffinity.

See I have read the developer guides and docs for android activity.

https://developer.android.com/guide/components/activities/tasks-and-back-stack and https://developer.android.com/guide/topics/manifest/activity-element.html#aff

<activity android:name=".MainActivity"
                  android:launchMode="singleInstance"
        >
</activity>

I want to know the taskAffinity - string literal for that task in which singleInstance activity resides as root.

Answer 1

The default taskAffinity is the package name of the app from the manifest <package> tag.

This is for all activities, no matter what the launch mode is.

This is why a lot of developers have problems using the special launch modes singleInstance and singleTask, because taskAffinity trumps launch mode, so sometimes those activities will NOT be launched in a new task, but simply launched into the existing task as if the launch mode were "standard".

Answer 2

The default taskAffinity of all activities including singleInstance activity will be the same (which is the applicationId), but the taskId of singleInstance activity will be different (unique) than other activities; but the users cannot see and switch tasks from the recents.

Setting a different taskAffinity to a singleInstance activity will give it that taskAffinity value and additionally allow the users to see and switch between the tasks from the recents.