override fun onCreate()

in ClassyTaxiAppKotlin/app/src/main/java/com/example/subscriptions/ui/MainActivity.kt [70:139]
51 lines of code
3 McCabe index (conditional complexity)

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        setSupportActionBar(toolbar)
        // Create the adapter that will return a fragment for each of the three
        // primary sections of the activity.
        sectionsPagerAdapter = SectionsPagerAdapter(supportFragmentManager)
        // Set up the ViewPager with the sections adapter.
        container.adapter = sectionsPagerAdapter
        container.addOnPageChangeListener(TabLayout.TabLayoutOnPageChangeListener(tabs))
        tabs.addOnTabSelectedListener(TabLayout.ViewPagerOnTabSelectedListener(container))

        authenticationViewModel = ViewModelProviders.of(this).get(FirebaseUserViewModel::class.java)
        billingViewModel = ViewModelProviders.of(this).get(BillingViewModel::class.java)
        subscriptionViewModel =
            ViewModelProviders.of(this).get(SubscriptionStatusViewModel::class.java)

        // Billing APIs are all handled in the this lifecycle observer.
        billingClientLifecycle = (application as SubApp).billingClientLifecycle
        lifecycle.addObserver(billingClientLifecycle)

        // Register purchases when they change.
        billingClientLifecycle.purchaseUpdateEvent.observe(this, {
            it?.let {
                registerPurchases(it)
            }
        })

        // Launch the billing flow when the user clicks a button to buy something.
        billingViewModel.buyEvent.observe(this, {
            it?.let {
                billingClientLifecycle.launchBillingFlow(this, it)
            }
        })

        // Open the Play Store when this event is triggered.
        billingViewModel.openPlayStoreSubscriptionsEvent.observe(this, {
            Log.i(TAG, "Viewing subscriptions on the Google Play Store")
            val sku = it
            val url = if (sku == null) {
                // If the SKU is not specified, just open the Google Play subscriptions URL.
                Constants.PLAY_STORE_SUBSCRIPTION_URL
            } else {
                // If the SKU is specified, open the deeplink for this SKU on Google Play.
                String.format(Constants.PLAY_STORE_SUBSCRIPTION_DEEPLINK_URL, sku, packageName)
            }
            val intent = Intent(Intent.ACTION_VIEW)
            intent.data = Uri.parse(url)
            startActivity(intent)
        })

        // Update authentication UI.
        authenticationViewModel.firebaseUser.observe(this, {
            invalidateOptionsMenu()
            if (it == null) {
                triggerSignIn()
            } else {
                Log.d(TAG, "CURRENT user: " + it.email + " " + it.displayName)
            }
        })

        // Update subscription information when user changes.
        authenticationViewModel.userChangeEvent.observe(this, {
            subscriptionViewModel.userChanged()
            billingClientLifecycle.purchaseUpdateEvent.value?.let {
                registerPurchases(it)
            }
        })

    }