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Android

Posted by dlpuxdzztg
dlpuxdzztg
8,243 Points

Accessing a list in a fragment.

Hello.

I wanted to know if there is a way I could access a RecyclerView list, in an activity, from a fragment and then add items to that list.

Thank you.

1 Answer

Ben Deitch
STAFF
Ben Deitch
Treehouse Teacher
Ben Deitch
Ben Deitch
Treehouse Teacher

The Android docs recommend using an interface: https://developer.android.com/training/basics/fragments/communicating.html

Also, while it's not a best practice, you could always make your list static :P

dlpuxdzztg
dlpuxdzztg
8,243 Points

Hmm...okay. But what if I wan to select a specific button instead of an item in a list?

Ben Deitch
Ben Deitch
Treehouse Teacher
Ben Deitch
Ben Deitch
Treehouse Teacher

You should still be able to use an interface for that. You'd just put whatever action you want to take on that Button inside the Activity's implementation of the interface.

dlpuxdzztg
dlpuxdzztg
8,243 Points

Ah okay, but how do I specify which button I want to press in my fragment?

Ben Deitch
Ben Deitch
Treehouse Teacher
Ben Deitch
Ben Deitch
Treehouse Teacher

You could create a different interface for each button or just have the interface function take in an argument to specify which button.

dlpuxdzztg
dlpuxdzztg
8,243 Points

Quick question actually. Should I create an interface for both my EditText's (because I wan't to send the data of the EditText's to the MainActivity) or should I create an interface for the button that sends you to the MainActivity?

Ben Deitch
Ben Deitch
Treehouse Teacher
Ben Deitch
Ben Deitch
Treehouse Teacher

I'd probably do the Button. But if that doesn't feel right, try the EditTexts!

dlpuxdzztg
dlpuxdzztg
8,243 Points

Okay, thanks!

Also, one final question. I want the info I get from my fragment to display in another activity, should I implement the fragment in the fragment holder activity or the activity where I want the info to be displayed?

Ben Deitch
Ben Deitch
Treehouse Teacher
Ben Deitch
Ben Deitch
Treehouse Teacher

I'd go with the Fragment holder Activity.