prevent crash on Android 11 and below

Completablefuture -> completeOnTimeout

forge-ai/src/main/java/forge/ai/AiAttackController.java

@@ -79,6 +79,7 @@ public class AiAttackController {
     private int aiAggression = 0; // how aggressive the ai is attack will be depending on circumstances
     private final boolean nextTurn; // include creature that can only attack/block next turn
     private final int timeOut;
+    private final boolean canUseTimeout;
     private List<CompletableFuture<Integer>> futures = new ArrayList<>();
 
     /**
@@ -98,6 +99,7 @@ public class AiAttackController {
         this.nextTurn = nextTurn;
         refreshCombatants(defendingOpponent);
         this.timeOut = ai.getGame().getAITimeout();
+        this.canUseTimeout = ai.getGame().canUseTimeout();
     } // overloaded constructor to evaluate attackers that should attack next turn
 
     public AiAttackController(final Player ai, Card attacker) {
@@ -112,6 +114,7 @@ public class AiAttackController {
         }
         this.blockers = getPossibleBlockers(oppList, this.attackers, this.nextTurn);
         this.timeOut = ai.getGame().getAITimeout();
+        this.canUseTimeout = ai.getGame().canUseTimeout();
     } // overloaded constructor to evaluate single specified attacker
 
     private void refreshCombatants(GameEntity defender) {
@@ -967,10 +970,16 @@ public class AiAttackController {
                         numForcedAttackers.incrementAndGet();
                     }
                     return 0;
+                }).exceptionally(ex -> {
+                    ex.printStackTrace();
+                    return 0;
                 }));
             }
             CompletableFuture<?>[] futuresArray = futures.toArray(new CompletableFuture<?>[0]);
-            CompletableFuture.allOf(futuresArray).completeOnTimeout(null, timeOut, TimeUnit.SECONDS).join();
+            if (canUseTimeout)
+                CompletableFuture.allOf(futuresArray).completeOnTimeout(null, timeOut, TimeUnit.SECONDS).join();
+            else
+                CompletableFuture.allOf(futuresArray).join();
             futures.clear();
             if (attackersLeft.isEmpty()) {
                 return aiAggression;

forge-ai/src/main/java/forge/ai/AiController.java

@@ -1684,7 +1684,10 @@ public class AiController {
 
         // instead of computing all available concurrently just add a simple timeout depending on the user prefs
         try {
-            return future.completeOnTimeout(null, game.getAITimeout(), TimeUnit.SECONDS).get();
+            if (game.AI_CAN_USE_TIMEOUT)
+                return future.completeOnTimeout(null, game.getAITimeout(), TimeUnit.SECONDS).get();
+            else
+                return future.get();
         } catch (InterruptedException | ExecutionException e) {
             return null;
         }

forge-ai/src/main/java/forge/ai/simulation/GameCopier.java

@@ -216,6 +216,7 @@ public class GameCopier {
     private void copyGameState(Game newGame, Player aiPlayer) {
         newGame.EXPERIMENTAL_RESTORE_SNAPSHOT = origGame.EXPERIMENTAL_RESTORE_SNAPSHOT;
         newGame.AI_TIMEOUT = origGame.AI_TIMEOUT;
+        newGame.AI_CAN_USE_TIMEOUT = origGame.AI_CAN_USE_TIMEOUT;
         newGame.setAge(origGame.getAge());
 
         // TODO countersAddedThisTurn

forge-game/src/main/java/forge/game/Game.java

@@ -90,6 +90,7 @@ public class Game {
 
     private final Zone stackZone = new Zone(ZoneType.Stack, this);
     public int AI_TIMEOUT = 5;
+    public boolean AI_CAN_USE_TIMEOUT = true;
 
     public boolean EXPERIMENTAL_RESTORE_SNAPSHOT = false;
     // While this is false here, its really set by the Match/Preferences
@@ -1359,4 +1360,7 @@ public class Game {
     public int getAITimeout() {
         return AI_TIMEOUT;
     }
+    public boolean canUseTimeout() {
+        return AI_CAN_USE_TIMEOUT;
+    }
 }

forge-gui-desktop/src/test/java/forge/ai/simulation/SimulationTest.java

@@ -48,6 +48,7 @@ public class SimulationTest {
         game.setAge(GameStage.Play);
         game.EXPERIMENTAL_RESTORE_SNAPSHOT = false;
         game.AI_TIMEOUT = FModel.getPreferences().getPrefInt(FPref.MATCH_AI_TIMEOUT);
+        game.AI_CAN_USE_TIMEOUT = true; //Only Android is restricted according to API Level
 
         return game;
     }

forge-gui-mobile/src/forge/screens/settings/SettingsPage.java

@@ -244,10 +244,12 @@ public class SettingsPage extends TabPage<SettingsScreen> {
                 Forge.getLocalizer().getMessage("cbExperimentalRestore"),
                 Forge.getLocalizer().getMessage("nlExperimentalRestore")),
                 1);
-        lstSettings.addItem(new CustomSelectSetting(FPref.MATCH_AI_TIMEOUT, Forge.getLocalizer().getMessage("cbAITimeout"),
+        if (!GuiBase.isAndroid() || GuiBase.getAndroidAPILevel() > 30) {
-                Forge.getLocalizer().getMessage("nlAITimeout"),
+            lstSettings.addItem(new CustomSelectSetting(FPref.MATCH_AI_TIMEOUT, Forge.getLocalizer().getMessage("cbAITimeout"),
-                Lists.newArrayList("5", "10", "60", "120", "240", "300", "600")),
+                    Forge.getLocalizer().getMessage("nlAITimeout"),
-                1);
+                    Lists.newArrayList("5", "10", "60", "120", "240", "300", "600")),
+                    1);
+        }
         lstSettings.addItem(new BooleanSetting(FPref.FILTERED_HANDS,
                 Forge.getLocalizer().getMessage("cbFilteredHands"),
                 Forge.getLocalizer().getMessage("nlFilteredHands")),

forge-gui/src/main/java/forge/gamemodes/match/HostedMatch.java

@@ -156,6 +156,9 @@ public class HostedMatch {
         game = match.createGame();
         game.EXPERIMENTAL_RESTORE_SNAPSHOT = FModel.getPreferences().getPrefBoolean(FPref.MATCH_EXPERIMENTAL_RESTORE);
         game.AI_TIMEOUT = FModel.getPreferences().getPrefInt(FPref.MATCH_AI_TIMEOUT);
+        // Android API 31 and above can use completeOnTimeout -> CompletableFuture:
+        //https://developer.android.com/reference/java/util/concurrent/CompletableFuture#completeOnTimeout(T,%20long,%20java.util.concurrent.TimeUnit)
+        game.AI_CAN_USE_TIMEOUT = !GuiBase.isAndroid() || GuiBase.getAndroidAPILevel() > 30;
 
         StaticData.instance().setSourceImageForClone(FModel.getPreferences().getPrefBoolean(FPref.UI_CLONE_MODE_SOURCE));