before-refactoring.kt

fun onClickLikeButton() {
    if (viewModel.liked) {
        
        //First we update the local model so the user feels the action is instantaneous
        viewModel.liked = false
        viewModel.count--
        
        //Then we call the API to update it on the server
        apiService.removeLike.enqueue({ response -> 
            
            //If everything goes right, we update the model with the information from the server
            viewModel.count = response.count
                                       
        }, { failure ->
            
            //If any error occurs we should let the user know and go back to the previous state
            Toast.makeToast(activity, "Ops, an error occurred", LENGTH_LONG).show() 
            
            viewModel.liked = true
            viewModel.count++
        })
    } else {
        //First we update the local model so the user feels the action is instantaneous
        viewModel.liked = true
        viewModel.count++
        
        //Then we call the API to update it on the server
        apiService.removeLike.enqueue({ response -> 
            
            //If everything goes right, we update the model with the information from the server
            viewModel.count = response.count
                                       
        }, { failure ->
            
            //If any error occurs we should let the user know and go back to the previous state
            Toast.makeToast(activity, "Ops, an error occurred", LENGTH_LONG).show() 
            
            viewModel.liked = false
            viewModel.count--
        })
        
    }
}