Fragment Inside Fragment

Fragment Inside Fragment

AFAIK, fragments cannot hold other fragments.

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UPDATE

With current versions of the Android Support package -- or native fragments on API Level 17 and higher -- you can nest fragments, by means of getChildFragmentManager(). Note that this means that you need to use the Android Support package version of fragments on API Levels 11-16, because even though there is a native version of fragments on those devices, that version does not have getChildFragmentManager().

fragment inside fragment {Kotlin}

If you are adding fragment for an activity you use either fragmentManager or supportFragmentManager.

If you are adding fragment for a fragment - you should use childFragmentManager, accessing fragmentManager from fragment will lead to using the same one that activity does.

Android adding Fragment inside Fragment

Try to use FrameLayout instead of LinearLayout as Placeholder.

How can I access and use button of one fragment inside another fragment?

I'd really recommend using the modern approach, which is the ViewModels component. A view model is basically a class that holds your data and state, and the component enables each fragment in your activity to fetch the same view model instance, so they're all looking at the same thing

That way, one fragment can set a value for some data, while another fragment observes it and gets notified whenever there's an update. Neither fragment needs to know about each other, they're just talking to the view model and observing the stuff they need to worry about. There's an example of this kind of thing in the docs

You can coordinate all this stuff yourself (e.g. by going through the parent Activity and making that talk to the other fragment) but you're adding a lot of work and boilerplate which ViewModels take care of for you. And it helps you to separate your UI (displaying stuff, handling user interactions) from the business logic (doing something with that data, updating the app state). It's definitely good to know and makes communication around your app a lot easier

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