[wallet] try not to instantiate TalerWalletCore more than once

2 files changed, 6 insertions, 1 deletions

diff --git a/wallet/src/main/AndroidManifest.xml b/wallet/src/main/AndroidManifest.xml
index 96c2958..aee1525 100644
--- a/wallet/src/main/AndroidManifest.xml
+++ b/wallet/src/main/AndroidManifest.xml
@@ -48,7 +48,7 @@
         <activity
             android:name=".MainActivity"
             android:exported="true"
-            android:launchMode="singleTop"
+            android:launchMode="singleInstance"
             android:theme="@style/AppTheme.NoActionBar">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
diff --git a/wallet/src/main/java/net/taler/wallet/backend/BackendManager.kt b/wallet/src/main/java/net/taler/wallet/backend/BackendManager.kt
index ae338e8..b2f1f10 100644
--- a/wallet/src/main/java/net/taler/wallet/backend/BackendManager.kt
+++ b/wallet/src/main/java/net/taler/wallet/backend/BackendManager.kt
@@ -22,6 +22,7 @@ import kotlinx.serialization.json.Json
 import net.taler.qtart.TalerWalletCore
 import net.taler.wallet.BuildConfig
 import org.json.JSONObject
+import java.util.concurrent.atomic.AtomicBoolean
 import kotlin.coroutines.resume
 import kotlin.coroutines.suspendCoroutine
 
@@ -40,12 +41,16 @@ class BackendManager(
         val json = Json {
             ignoreUnknownKeys = true
         }
+        @JvmStatic
+        private val initialized = AtomicBoolean(false)
     }
 
     private val walletCore = TalerWalletCore()
     private val requestManager = RequestManager()
 
     init {
+        // TODO using Dagger/Hilt and @Singleton would be nice as well
+        if (initialized.getAndSet(true)) error("Already initialized")
         walletCore.setMessageHandler { onMessageReceived(it) }
         if (BuildConfig.DEBUG) walletCore.setStdoutHandler {
             Log.d(TAG_CORE, it)