Android - Set Fragment Id

How do I find the ID of a fragment? Alternatively, how do I give the fragment an ID?

Provided you keep a reference to your FragmentStatePagerAdapter and to the index of the Fragment in view, you can call getItem(int position) on your FragmentStatePagerAdapter, which will return the Fragment.

How to set a Fragment tag by code?

Yes. So the only way is at transaction time, e.g. using add, replace, or as part of the layout.

I determined this through an examination of the compatibility sources as I briefly looked for similar at some point in the past.

How to get the ID of a fragment?

The findFragmentById() method gets a Fragment id out of a container if there actually a Fragment inside it. Otherwise you will get null back.
findFragmentById(R.id.fragment_container) returns the Fragment inside the LinearLayout of your tutorial.

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