Update Datalist after a Button is pressed in Android


I have a list of T-objects. Each of this objects has a
list of S-objects. I want to show the
List<S>-data. That for I am using nested
RecyclerView.



Since I want to change the data of the S-objects at
runtime I use EditText to show and edit the data.



When a button is pressed I want to save all changed
S-objects in the list of the seleceted T
obeject.



How and in which class can I iterate this
List<S>?
Are DataObservers the way to go? But I can not find any
good examples of this observers.


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