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<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/baseline_navigation"
    app:startDestination="@id/step1Fragment">

    <fragment
        android:id="@+id/step1Fragment"
        android:name="com.example.abnavigationexample.ui.abtest.fragments.Step1Fragment"

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<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/baseline_navigation"
    app:startDestination="@id/step1Fragment">

    <fragment
        android:id="@+id/step1Fragment"
        android:name="com.example.abnavigationexample.ui.abtest.fragments.Step1Fragment"

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enum class ABTestVariation(val navGraphRes: Int) {
    BASELINE(R.navigation.baseline_navigation),
    VARIATION1(R.navigation.variant1_navigation),
    VARIATION2(R.navigation.variant2_navigation),
}

private val abTestVariation: ABTestVariation by lazy {
    intent?.getSerializableExtra(KEY) as? ABTestVariation ?: ABTestVariation.BASELINE
}

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 private void getRecipesFromWeb(){
        Timber.d("getRecipesFromWeb");
        recipeApi.getRecipesFromWeb().enqueue(new Callback<List<Recipe>>() {
            @Override
            public void onResponse(Call<List<Recipe>> call, Response<List<Recipe>> response) {
                if (response.isSuccessful()) {
                    setRecipesListObservableStatus(Status.SUCCESS,null);
                    addRecipesToDB(response.body());
                } else {
                    // error case

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 private void loadAllRecipesFromDB() {
        Timber.d("loadAllRecipesFromDB");
        new AsyncTask<Void, Void, List<Recipe>>() {
            @Override
            protected List<Recipe> doInBackground(Void...a) {
                return recipesDAO.getAllEntries();
            }

            @Override
            protected void onPostExecute(List<Recipe> results) {

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 public void fetchData(){
        List<Recipe> loadingList = null;
        if (recipesListObservable.getValue()!=null){
            loadingList=recipesListObservable.getValue().data;
        }
        recipesListObservable.setValue(Resource.loading(loadingList));
        loadAllRecipesFromDB();
        getRecipesFromWeb();
    }

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 public void getData(){
        mRepository.fetchData();
    }

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 //couple the activity with the view model
 viewModel = ViewModelProviders.of(this).get(MainActivityViewModel.class);
 //subscribe to LiveData
        viewModel.getRecipesListObservable().observe(MainActivity.this, new Observer<Resource<List<Recipe>>>() {
           @Override
           public void onChanged(@Nullable Resource<List<Recipe>> recipes) {
              Timber.d(recipes.status.toString());
           }
       });
       //ask the viewmodel for data (maybe an event happened?or onCreate?)

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/*
 * Copyright (C) 2017 The Android Open Source Project
 */
//a generic wrapper class that describes a data with a status
public class Resource<T> {
    @NonNull
    public final Status status;
    @Nullable
    public final T data;
    @Nullable public final String message;

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package com.example.android.menu;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.TextView;


public class MainActivity extends AppCompatActivity {