android: add google and foss build flavors (#7328)

* android: add google and foss build flavors

* android: get the Google Play account country in the google flavor

* android, desktop: update whats new

* temp: comment out wefunder link

apps/multiplatform/android/src/foss/java/chat/simplex/app/PlayStore.kt

@@ -0,0 +1,4 @@
+package chat.simplex.app
+
+// Play Billing is only in the google flavor, so the Play country stays unknown here
+fun loadPlayStoreCountry() {}

apps/multiplatform/android/src/google/java/chat/simplex/app/PlayStore.kt

@@ -0,0 +1,31 @@
+package chat.simplex.app
+
+import chat.simplex.common.platform.androidAppContext
+import chat.simplex.common.platform.androidPlayStoreCountry
+import com.android.billingclient.api.*
+
+// Requests the country of the Google Play account into [androidPlayStoreCountry].
+// It stays null when Play is unavailable or the user is not signed in.
+fun loadPlayStoreCountry() {
+  val client = BillingClient.newBuilder(androidAppContext)
+    .setListener { _, _ -> }
+    .enablePendingPurchases(PendingPurchasesParams.newBuilder().enableOneTimeProducts().build())
+    .build()
+  client.startConnection(object : BillingClientStateListener {
+    override fun onBillingSetupFinished(result: BillingResult) {
+      if (result.responseCode != BillingClient.BillingResponseCode.OK) {
+        client.endConnection()
+        return
+      }
+      client.getBillingConfigAsync(GetBillingConfigParams.newBuilder().build()) { configResult, config ->
+        if (configResult.responseCode == BillingClient.BillingResponseCode.OK) {
+          androidPlayStoreCountry.value = config?.countryCode
+        }
+        client.endConnection()
+      }
+    }
+
+    // The connection is only used for this one request, it is not retried
+    override fun onBillingServiceDisconnected() = client.endConnection()
+  })
+}

apps/multiplatform/android/src/main/java/chat/simplex/app/SimplexApp.kt

@@ -341,6 +341,8 @@ class SimplexApp: Application(), LifecycleEventObserver {
 
       override fun androidIsXiaomiDevice(): Boolean = setOf("xiaomi", "redmi", "poco").contains(Build.BRAND.lowercase())
 
+      override fun androidLoadPlayStoreCountry() = loadPlayStoreCountry()
+
       @SuppressLint("SourceLockedOrientationActivity")
       @Composable
       override fun androidLockPortraitOrientation() {
@@ -370,6 +372,8 @@ class SimplexApp: Application(), LifecycleEventObserver {
       override fun androidCreateActiveCallState(): Closeable = ActiveCallState()
 
       override val androidApiLevel: Int get() = Build.VERSION.SDK_INT
+
+      override val androidIsPlayStoreBuild: Boolean get() = BuildConfig.PLAY_STORE
     }
   }