From f4e90e1d389729c820e75b14aa110648eee7decd Mon Sep 17 00:00:00 2001
From: Anthony Calosa <anthonycalosa@gmail.com>
Date: Wed, 24 Sep 2025 13:47:12 +0800
Subject: [PATCH] fix NoSuchMethodError on older Android - closes #8771 -
 closes #8770

---
 .../forge/gamemodes/planarconquest/ConquestData.java   |  4 ++--
 .../forge/gamemodes/planarconquest/ConquestUtil.java   | 10 ++++++----
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/forge-gui/src/main/java/forge/gamemodes/planarconquest/ConquestData.java b/forge-gui/src/main/java/forge/gamemodes/planarconquest/ConquestData.java
index 0ed47c54c12..778f989cab3 100644
--- a/forge-gui/src/main/java/forge/gamemodes/planarconquest/ConquestData.java
+++ b/forge-gui/src/main/java/forge/gamemodes/planarconquest/ConquestData.java
@@ -294,8 +294,8 @@ public final class ConquestData {
                     commandersUsingCard.append("\n").append(CardTranslation.getTranslatedName(commander.getName()));
                 }
             }
-
-            if (!commandersUsingCard.isEmpty()) {
+            // Android API StringBuilder isEmpty() is unavailable. https://developer.android.com/reference/java/lang/StringBuilder
+            if (commandersUsingCard.length() != 0) {
                 SOptionPane.showMessageDialog(Localizer.getInstance().getMessage("lblCommandersCardCannotBeExiledByCard", CardTranslation.getTranslatedName(card.getName()), commandersUsingCard), title, SOptionPane.INFORMATION_ICON);
                 return false;
             }
diff --git a/forge-gui/src/main/java/forge/gamemodes/planarconquest/ConquestUtil.java b/forge-gui/src/main/java/forge/gamemodes/planarconquest/ConquestUtil.java
index 59b3221349f..19912f1e05f 100644
--- a/forge-gui/src/main/java/forge/gamemodes/planarconquest/ConquestUtil.java
+++ b/forge-gui/src/main/java/forge/gamemodes/planarconquest/ConquestUtil.java
@@ -147,11 +147,13 @@ public class ConquestUtil {
         }
         //Move editions of cards already in the deck to the front.
         Map<CardEdition, Integer> editionStats = currentDeck.getAllCardsInASinglePool().getCardEditionStatistics(true);
+        // use flatMap instead of mapMulti for Android 13 and below
+        //https://developer.android.com/reference/java/util/stream/Stream#mapMulti
         List<CardEdition> out = planes.stream()
-                .<CardEdition>mapMulti((p, c) -> p.getEditions().forEach(c))
-                .filter(CardEdition::hasBasicLands)
-                .sorted(Comparator.comparing(e -> editionStats.getOrDefault(e, 0)))
-                .collect(Collectors.toList());
+            .flatMap(p -> p.getEditions().stream())
+            .filter(CardEdition::hasBasicLands)
+            .sorted(Comparator.comparing(e -> editionStats.getOrDefault(e, 0)))
+            .collect(Collectors.toList());
         return out;
     }