first draft of IAP implementation

app/build.gradle

@@ -87,6 +87,9 @@ dependencies {
     // Places
     implementation 'com.google.android.libraries.places:places:1.1.0'
 
+    // Billing / Subscriptions
+    implementation 'com.android.billingclient:billing:1.2.2'
+
     // Firebase
     implementation 'com.google.firebase:firebase-core:16.0.8'
 

app/src/main/AndroidManifest.xml

@@ -4,6 +4,7 @@
 
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
+    <uses-permission android:name="com.android.vending.BILLING" />
 
     <application
         android:name=".PokerAnalyticsApplication"
@@ -95,6 +96,11 @@
             android:launchMode="singleTop"
             android:screenOrientation="portrait" />
 
+        <activity
+            android:name="net.pokeranalytics.android.ui.activity.BillingActivity"
+            android:launchMode="singleTop"
+            android:screenOrientation="portrait" />
+
         <meta-data
             android:name="preloaded_fonts"
             android:resource="@array/preloaded_fonts" />

app/src/main/java/net/pokeranalytics/android/PokerAnalyticsApplication.kt

@@ -26,6 +26,9 @@ class PokerAnalyticsApplication : Application() {
 		super.onCreate()
         UserDefaults.init(this)
 
+		// AppGuard / Billing services
+//		AppGuard.load(this.applicationContext)
+
 		// Realm
 		Realm.init(this)
 		val realmConfiguration = RealmConfiguration.Builder()
@@ -52,7 +55,7 @@ class PokerAnalyticsApplication : Application() {
 
 		if (BuildConfig.DEBUG) {
 			Timber.d("UserPreferences.defaultCurrency: ${UserDefaults.currency.symbol}")
-			this.createFakeSessions()
+//			this.createFakeSessions()
 		}
 
 		Patcher.patchBreaks()

app/src/main/java/net/pokeranalytics/android/ui/activity/BillingActivity.kt

@@ -0,0 +1,36 @@
+package net.pokeranalytics.android.ui.activity
+
+import android.content.Context
+import android.content.Intent
+import android.os.Bundle
+import net.pokeranalytics.android.R
+import net.pokeranalytics.android.ui.activity.components.PokerAnalyticsActivity
+import net.pokeranalytics.android.util.billing.AppGuard
+
+enum class IAPProducts(var identifier: String) {
+	PRO("pro")
+}
+
+class BillingActivity : PokerAnalyticsActivity() {
+
+	companion object {
+		fun newInstance(context: Context) {
+			val intent = Intent(context, BillingActivity::class.java)
+			context.startActivity(intent)
+		}
+	}
+
+	override fun onCreate(savedInstanceState: Bundle?) {
+		super.onCreate(savedInstanceState)
+		setContentView(R.layout.activity_billing)
+	}
+
+	override fun onResume() {
+		super.onResume()
+
+		AppGuard.restorePurchases()
+	}
+
+}
+
+

app/src/main/java/net/pokeranalytics/android/ui/fragment/SubscriptionFragment.kt

@@ -0,0 +1,68 @@
+package net.pokeranalytics.android.ui.fragment
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Toast
+import com.android.billingclient.api.BillingClient
+import com.android.billingclient.api.SkuDetails
+import com.android.billingclient.api.SkuDetailsResponseListener
+import kotlinx.android.synthetic.main.fragment_subscription.*
+import net.pokeranalytics.android.R
+import net.pokeranalytics.android.ui.activity.IAPProducts
+import net.pokeranalytics.android.ui.fragment.components.PokerAnalyticsFragment
+import net.pokeranalytics.android.util.billing.AppGuard
+
+class SubscriptionFragment : PokerAnalyticsFragment(), SkuDetailsResponseListener {
+
+	var selectedProduct: SkuDetails? = null
+
+	override fun onCreate(savedInstanceState: Bundle?) {
+		super.onCreate(savedInstanceState)
+
+		if (!AppGuard.requestProducts(this)) {
+			Toast.makeText(requireContext(), R.string.billingclient_unavailable, Toast.LENGTH_LONG).show()
+		}
+
+	}
+
+	override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
+		return inflater.inflate(R.layout.fragment_subscription, container, false)
+	}
+
+	override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+		super.onViewCreated(view, savedInstanceState)
+
+		initUI()
+
+	}
+
+	// SkuDetailsResponseListener
+	override fun onSkuDetailsResponse(responseCode: Int, skuDetailsList: MutableList<SkuDetails>?) {
+
+		if (responseCode == BillingClient.BillingResponse.OK && skuDetailsList != null) {
+			selectedProduct = skuDetailsList.first { it.sku == IAPProducts.PRO.identifier }
+			updatePurchaseButtonState()
+		}
+
+	}
+
+	private fun initUI() {
+
+		this.purchase.setOnClickListener {
+
+			this.selectedProduct?.let {
+				AppGuard.initiatePurchase(this.requireActivity(), it)
+			} ?: run {
+				throw IllegalStateException("Attempt to initiate purchase while no product has been chosen")
+			}
+		}
+
+	}
+
+	private fun updatePurchaseButtonState() {
+		this.purchase.isEnabled = (this.selectedProduct != null)
+	}
+
+}

app/src/main/java/net/pokeranalytics/android/util/billing/AppGuard.kt

@@ -0,0 +1,110 @@
+package net.pokeranalytics.android.util.billing
+
+import android.app.Activity
+import android.content.Context
+import com.android.billingclient.api.*
+import net.pokeranalytics.android.ui.activity.IAPProducts
+
+object AppGuard : PurchasesUpdatedListener {
+
+	lateinit private var billingClient: BillingClient
+
+	private var billingClientAvailable: Boolean = false
+
+	fun load(context: Context) {
+
+		billingClient = BillingClient.newBuilder(context).setListener(this).build()
+
+		this.restorePurchases()
+
+		billingClient.startConnection(object : BillingClientStateListener {
+			override fun onBillingSetupFinished(@BillingClient.BillingResponse billingResponseCode: Int) {
+				if (billingResponseCode == BillingClient.BillingResponse.OK) {
+					// The BillingClient is ready. You can query purchases here.
+
+					billingClientAvailable = true
+
+				}
+			}
+			override fun onBillingServiceDisconnected() {
+				billingClientAvailable = false
+
+				// Try to restart the connection on the next request to
+				// Google Play by calling the startConnection() method.
+			}
+		})
+
+	}
+
+	fun restorePurchases() {
+		// Automatically checks for purchases (when switching devices for example)
+		val purchasesResult=
+			billingClient.queryPurchases(BillingClient.SkuType.SUBS)
+		purchasesResult.purchasesList.forEach {
+			this.handlePurchase(it)
+		}
+	}
+
+	fun requestProducts(listener: SkuDetailsResponseListener) : Boolean {
+
+		if (this.billingClientAvailable) {
+
+			val skuList = ArrayList<String>()
+			skuList.add(IAPProducts.PRO.identifier)
+			val params = SkuDetailsParams.newBuilder()
+			params.setSkusList(skuList).setType(BillingClient.SkuType.SUBS)
+
+			billingClient.querySkuDetailsAsync(params.build(), listener)
+			return true
+		}
+		return false
+	}
+
+	fun initiatePurchase(activity: Activity, skuDetails: SkuDetails) {
+
+		val flowParams = BillingFlowParams.newBuilder()
+			.setSkuDetails(skuDetails)
+			.build()
+		val responseCode = billingClient.launchBillingFlow(activity, flowParams)
+
+	}
+
+	// PurchasesUpdatedListener
+
+	override fun onPurchasesUpdated(responseCode: Int, purchases: MutableList<Purchase>?) {
+
+		if (responseCode == BillingClient.BillingResponse.OK && purchases != null) {
+			for (purchase in purchases) {
+				handlePurchase(purchase)
+			}
+		} else if (responseCode == BillingClient.BillingResponse.USER_CANCELED) {
+			// Handle an error caused by a user cancelling the purchase flow.
+		} else {
+			// Handle any other error codes.
+		}
+
+	}
+
+	private fun handlePurchase(purchase: Purchase) {
+
+		val token = purchase.purchaseToken
+		val oj = purchase.originalJson
+
+		if (this.verifyPurchase(purchase)) {
+			when (purchase.sku) {
+				IAPProducts.PRO.identifier -> {
+
+				}
+				else -> {}
+			}
+		} else {
+			// invalid purchase
+		}
+
+	}
+
+	private fun verifyPurchase(purchase: Purchase) : Boolean {
+		return true
+	}
+
+}

app/src/main/res/layout/activity_billing.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:orientation="vertical">
+
+    <fragment
+        android:id="@+id/subscriptionFragment"
+        android:name="net.pokeranalytics.android.ui.fragment.SubscriptionFragment"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        tools:layout="@layout/fragment_subscription" />
+
+</LinearLayout>

app/src/main/res/layout/fragment_subscription.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical">
+
+    <com.google.android.material.button.MaterialButton
+        android:id="@+id/purchase"
+        style="@style/PokerAnalyticsTheme.Button"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        android:layout_height="wrap_content"
+        android:layout_margin="16dp"
+        android:text="@string/purchase" />
+
+
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/values/strings.xml

@@ -11,6 +11,7 @@
     <string name="initial_value">Initial Value</string>
     <string name="less_then_2_values_for_display">Can\'t show because there is less than two values to display!</string>
     <string name="invalid_object">The object you\'re trying to access is invalid</string>
+    <string name="billingclient_unavailable">The billing service is unavailable at the moment. Please check your internet connection and retry later.</string>
 
     <string name="address">Address</string>
     <string name="suggestions">Naming suggestions</string>