Healing/Damage 块输出两次？

Question

 @EventHandler
    public void playerInteraction(PlayerInteractEvent event)
    {
        Action action = event.getAction();
        Player player = event.getPlayer();
        Block block = event.getClickedBlock();

        if (action.equals(Action.RIGHT_CLICK_BLOCK))
        {
            if (block.getType().equals(Material.NETHER_WART_BLOCK))
            {
                player.setHealth(player.getHealth() -1);
                player.playSound(player.getLocation(), Sound.ENTITY_PLAYER_HURT, 10, 1);
            }
            else if (block.getType().equals(Material.DIAMOND_BLOCK))
            {
                player.addPotionEffect(new PotionEffect(PotionEffectType.SPEED, 1000, 2));
                player.playSound(player.getLocation(), Sound.ENTITY_SPLASH_POTION_BREAK, 10, 1);
            }
            else if(block.getType().equals(Material.EMERALD_BLOCK))
            {
                if (player.getHealth() != 20)
                {
                    player.setHealth(player.getHealth() + 1);
                    player.playSound(player.getLocation(), Sound.ENTITY_EXPERIENCE_ORB_PICKUP, 10, 1);;
                }
                if (player.getHealth() == 20)
                {
                    player.sendMessage(ChatColor.DARK_RED + "You are already at full health!");
                }
            }
        }
    }

出于某种原因，每当我右键单击指定的块时，所有这些事情都会发生两次。有人知道为什么吗？我把整个方法贴出来了，是玩家互动事件

谢谢:)

Answer 1

首先，请确保您没有注册包含事件处理程序的侦听器 class 两次。

如果情况并非如此，根据 spigot 论坛上的这个帖子，由于 Mojang 将左手插槽添加到 Minecraft，一些事件（如 PlayerInteractEvent 或 InventoryClickEvent）将被调用两次（每只手一次）。

一个可能的解决方法是 "disable" 左手放在事件处理程序上：

@EventHandler
public void onPlayerInteraction(PlayerInteractEvent event) {
    if(event.getAction() == Action.RIGHT_CLICK_BLOCK && event.getHand() == EquipmentSlot.HAND) {
        //Do something once
    }
}

如果您需要双手都可以触发事件，您可以执行以下操作：

第一次执行代码时，您将播放器添加到列表中。
在执行代码之前，您检查播放器是否在列表中。如果它在列表中，则表示代码已执行一次，因此您可以跳过它。
安排一个任务，稍后将玩家从列表中删除。

代码可以如下：

public class Foo implements Listener {

    //An instance of the main plugin class
    private MainClass plugin;

    private List<UUID> playerBlacklist = new ArrayList<>();

    @EventHandler
    public void onPlayerInteractEvent(PlayerInteractEvent event) {
        if(playerBlacklist.contains(event.getPlayer().getUniqueId)) {
            return;
        } else {
            blacklistPlayer(event.getPlayer());
        }
        //Do something
    }

    private void blacklistPlayer(UUID uuid) {
        playerBlacklist.add(uuid);
        BukkitRunnable runnable = new BukkitRunnable(){
            @Override
            public void run() {
                playerBlacklist.remove(uuid);
            }
        }
        runnable.runTaskLaterAsynchronously(plugin, 5L);
    }
}

如果这解决了您的问题，请告诉我。

Healing/Damage 块输出两次？

Healing/Damage Blocks are outputting twice?

java

bukkit