Implemented currentOrNextActivity() so that caller gets an activity in either case

fints4javaAndroidApp/src/main/java/net/dankito/banking/fints4java/android/RouterAndroid.kt

@@ -21,51 +21,49 @@ import java.util.concurrent.atomic.AtomicReference
 open class RouterAndroid(protected val activityTracker: CurrentActivityTracker) : IRouter {
 
     override fun showAddAccountDialog(presenter: BankingPresenter) {
-        activityTracker.currentActivity?.let { activity ->
+        activityTracker.currentOrNextActivity { activity ->
             AddAccountDialog().show(activity)
         }
     }
 
     override fun getTanFromUserFromNonUiThread(account: Account, tanChallenge: TanChallenge, presenter: BankingPresenter): EnterTanResult {
-        return activityTracker.currentActivity?.let { activity ->
         val enteredTan = AtomicReference<EnterTanResult>(null)
         val tanEnteredLatch = CountDownLatch(1)
 
+        activityTracker.currentOrNextActivity { activity ->
             activity.runOnUiThread {
                 EnterTanDialog().show(account, tanChallenge, activity, false) {
                     enteredTan.set(it)
                     tanEnteredLatch.countDown()
                 }
             }
+        }
 
         try { tanEnteredLatch.await() } catch (ignored: Exception) { }
 
-            enteredTan.get()
+        return enteredTan.get()
-        }
-        ?: EnterTanResult.userDidNotEnterTan()
     }
 
     override fun getAtcFromUserFromNonUiThread(tanMedium: TanGeneratorTanMedium): EnterTanGeneratorAtcResult {
-        return activityTracker.currentActivity?.let { activity ->
         val result = AtomicReference<EnterTanGeneratorAtcResult>(null)
         val tanEnteredLatch = CountDownLatch(1)
 
+        activityTracker.currentOrNextActivity { activity ->
             activity.runOnUiThread {
                 EnterAtcDialog().show(tanMedium, activity, false) { enteredResult ->
                     result.set(enteredResult)
                     tanEnteredLatch.countDown()
                 }
             }
+        }
 
         try { tanEnteredLatch.await() } catch (ignored: Exception) { }
 
-            result.get()
+        return result.get()
-        }
-        ?: EnterTanGeneratorAtcResult.userDidNotEnterTan()
     }
 
     override fun showTransferMoneyDialog(presenter: BankingPresenter, preselectedBankAccount: BankAccount?, preselectedValues: TransferMoneyData?) {
-        activityTracker.currentActivity?.let { activity ->
+        activityTracker.currentOrNextActivity { activity ->
             TransferMoneyDialog().show(activity, preselectedBankAccount, preselectedValues)
         }
     }

fints4javaAndroidApp/src/main/java/net/dankito/banking/fints4java/android/ui/util/CurrentActivityTracker.kt

@@ -8,6 +8,9 @@ import kotlin.concurrent.schedule
 
 open class CurrentActivityTracker {
 
+    protected val nextActivitySetListeners = CopyOnWriteArrayList<(BaseActivity) -> Unit>()
+
+
     var currentActivity: BaseActivity? = null
         set(value) {
             field = value // TODO: check field != value
@@ -18,7 +21,14 @@ open class CurrentActivityTracker {
         }
 
 
-    protected val nextActivitySetListeners = CopyOnWriteArrayList<(BaseActivity) -> Unit>()
+    open fun currentOrNextActivity(activity: (BaseActivity) -> Unit) {
+        currentActivity?.let {
+            activity(it)
+        }
+        ?: addNextActivitySetListener {
+            activity(it)
+        }
+    }
 
     open fun addNextActivitySetListener(listener: (BaseActivity) -> Unit) {
         synchronized(nextActivitySetListeners) {