Share Viewmodels Between Fragments Or Share Livedata Between Viewmodels

Basically I want a way to properly share ViewModels between fragments OR share LiveData between ViewModels. My scenario: I have 2 fragments (FragmentA & FragmentB) - each has i

Solution 1:

Shared ViewModel is the right approach

You should use a single Shared ViewModel for both fragments FragmentA and FragmentB with multiple live data objects LiveDataA1, LiveDataB1 and LiveDataB2, with this approach your FragmentA can easily observe LiveDataB2.

Now, the problem with your approaches are:

Approach#1:

If FragmentA creates an instance of ViewModelB you will not get ViewModelB associate with FragmentB so ViewModelB lost its state.

Approach#2:

Somehow the problem is you are creating separate ViewModel when there is a recommended way i.e Shared ViewModel as per official docs

Approach#3:

Sharing LiveData objects is not the right approach as it is associated with lifecycle owner.