[FIXED] How to get callback in fragment when it's in stack (currently not visible)

Issue

I want callback in fragment when it's not currently visible

Ex: I am opening FragmentA then I am opening FragmentB now I am updating list sequence in FragmentB after updating list sequence I also want to update list in FragmentA before opening it (want to update list in FragmentA when FragmentB is visible)

I have not perform .popBackStack() in FragmentB

Now if I update list seqeuence 2nd time then list sequence in FragmentA should update

In sort : I want callback in fragment when it's not currently visible

Is it posible?

Solution

You have several options to achieve this, it depends on many factors such as the context of your task, what type of data you want to share between fragments, what type of architecture in your project, and whether the data should be persistent in the memory or, database or another cache, etc.

• If you want to pass a one-time simple data to Fragment A then you can use Fragment Result API
• If you are using Android Architecture Components and MVVM then try Shared View Model or NavGraph View Model
• If you have a DI you can use some scoped instance to temporarily keep and share your data (for example a Repository), so the scope of life of the instance should be longer than these 2 fragments.
• If you have storage that allows changes observing then you can subscribe to the changes in Fragment A (for example Room Observing database changes).

Answered By - sergpetrov
Answer Checked By - Clifford M. (JavaFixing Volunteer)