How to keep data when navigate to another fragment use navigation direction?

Issue

I have 2 fragment: fragment1 and fragment2

I'm using Navigation to navigate fragment1 to fragment2:

val action = Fragment1Directions.actionFragment1ToFragment2()
navController.navigate(action)

My fragment1 contain RecyclerView with data change. When I clicked to item in fragment1's RecyclerView will open fragment2. And when I press back button I back to fragment1 with loss data.

I want to keep my data when move to fragment2 and back to fragment1 (fragment2 like popup in web). How can I do it.

Update:

I used View Model to keep LiveData. but when I back from fragment2 to fragment1, fragment1 reloaded. How can I open fragment2 and hold fragment1 (temp open fragment2). I'm using Navigation

Solution

I found the solution:

1. use View Model to keep LiveData
2. use Dialog destinations for fragment2. Visit https://gist.github.com/utkukutlu/bd2e37253e7184179d923321e3ea72c1 for more detail with Dialog destinations

Learned experience:

1. Navigation fragment only replace not have add. I want Navigation act like add so I use Dialog destinations
2. I use Dialog destinations so I have to use View Model to keep LiveData when I update my data in fragment1

Answered By - An Dương