Java 在PlayerMoveEvent中仅执行p.sendMessage一次

当playerMoveEvent执行时，它会在他每次走动时发送一条取消消息。能否只发送一次

以下是主要课程：

package me.mortadelle2.togglePVP;

import java.util.ArrayList;
import java.util.HashMap;

import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;

public class PVP extends JavaPlugin{

    public int turnOn;
    public int turnOff;

    ArrayList<String> noPVP = new ArrayList<String>();

    HashMap<String, Integer> stepCounter = new HashMap<String, Integer>();

    public void onEnable(){
        new MainEvents(this);
        getLogger().info("You may now toggle PVP!");
    }

    public void onDisable(){
        getLogger().info("You may no longer toggle PVP ;(");
    }

    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {

    final Player p = (Player) sender;

        if (cmd.getName().equalsIgnoreCase("pvp") && p.hasPermission("togglepvp.toggle")){

            if (args.length == 0){
                p.sendMessage(ChatColor.RED + "Invalid usage! /pvp [on or off]");
                return true;
            }

            if (args.length == 1){

                if (args[0].equalsIgnoreCase("on")){

                    stepCounter.put(p.getName(), 0);

                    p.sendMessage(ChatColor.RED + "PVP " + ChatColor.YELLOW + "will be turned on in 5 seconds! Don't move!");

                    turnOn = this.getServer().getScheduler().scheduleSyncDelayedTask(this, new Runnable() {



                        @Override
                        public void run() {

                            noPVP.remove(p.getName());
                            p.sendMessage(ChatColor.RED + "PVP" + ChatColor.YELLOW + " has been turned on!");

                        }
                    }, 100L);
                    return true;
                }

                if (args[0].equalsIgnoreCase("off") && p.hasPermission("togglepvp.toggle")) {

                    stepCounter.put(p.getName(), 0);

                    p.sendMessage(ChatColor.RED + "PVP " + ChatColor.YELLOW
                            + "will be turned off in 5 seconds! Don't move!");

                    turnOff = this.getServer().getScheduler()
                            .scheduleSyncDelayedTask(this, new Runnable() {

                                @Override
                                public void run() {

                                    noPVP.add(p.getName());
                                    p.sendMessage(ChatColor.RED + "PVP"
                                            + ChatColor.YELLOW
                                            + " has been turned off!");

                                }
                            }, 100L);
                    return true;
                }

            }

        }


        return false;
    }

}

---

我试着计算他的步数，在他走路时递增，但这不起作用，所以我无法想象会发生什么。

你可以从删除所有全局变量开始，然后创建一个公共静态数组列表，用于保存所有启用pvp保护的玩家，以及一个用于等待更改状态的玩家

public static ArrayList<String> noPVP = new ArrayList<String>();//Holds players that have pvp protection enabled
public static ArrayList<String> playersWaiting = new ArrayList<String>();//Holds players waiting to change states

如果玩家移动事件改变了位置，则应将其从地图中完全移除：

@EventHandler
public void playerMovesSoCancelsTask(PlayerMoveEvent e) {
    Player player = e.getPlayer();//Get the player

    //Check if the player is moving to a new block
    if (e.getTo().getBlockX() != e.getFrom().getBlockX() || e.getTo().getBlockY() != e.getFrom().getBlockY() || e.getTo().getBlockZ() != e.getFrom().getBlockZ()) {

        //Check if the player is waiting to turn on/off pvp
        if (PVP.playersWaiting.contains(player.getName())) {
            player.sendMessage(ChatColor.RED + "You moved so the action was cancelled!");
            PVP.playersWaiting.remove(player.getName()); //Remove the player from the waiting list
        }
    }
}

我注意到的其他几个问题：

1） 你在没有任何检查的情况下向玩家施放CommandSender。尝试从控制台执行命令，看看会发生什么。谷歌搜索应该告诉你如何解决这个问题

2） 在侦听器的

playerDamagesWhenToggleOff

方法中，检查播放器本身，而不是其名称。确保使用它们的名称：

if（Main.novp.containsKey（被害人.getName（））{e.setCancelled（）}

3） 从不从变量中删除播放器，请确保创建新的

playerquiteevent

，并从所有全局变量中删除播放器

if (args[0].equalsIgnoreCase("on")) {
    player.sendMessage(ChatColor.YELLOW + "PVP will be turned on in 5 seconds! Don't move!");
    playersWaiting.add(player.getName());

    Bukkit.getScheduler().scheduleSyncDelayedTask(this, new Runnable() {

        @Override
        public void run() {
            if (playersWaiting.contains(player.getName())) {
                playersWaiting.remove(player.getName());
                noPVP.remove(player.getName());
                player.sendMessage(ChatColor.YELLOW + "You have turned PVP on!");
            }
        }
    }, 100L);
    return true;
} else if (args[0].equalsIgnoreCase("off")) {
    player.sendMessage(ChatColor.YELLOW + "PVP will be turned off in 5 seconds. Don't move!");
    playersWaiting.add(player.getName());

    this.getServer().getScheduler().scheduleSyncDelayedTask(this, new Runnable() {

        @Override
        public void run() {
            if (playersWaiting.contains(player.getName())) {
                playersWaiting.remove(player.getName());
                noPVP.add(player.getName());
                player.sendMessage(ChatColor.YELLOW + "You have turned PVP off!");
            }
        }
    }, 100L);
    return true;
}

@EventHandler
public void playerMovesSoCancelsTask(PlayerMoveEvent e) {
    Player player = e.getPlayer();//Get the player

    //Check if the player is moving to a new block
    if (e.getTo().getBlockX() != e.getFrom().getBlockX() || e.getTo().getBlockY() != e.getFrom().getBlockY() || e.getTo().getBlockZ() != e.getFrom().getBlockZ()) {

        //Check if the player is waiting to turn on/off pvp
        if (PVP.playersWaiting.contains(player.getName())) {
            player.sendMessage(ChatColor.RED + "You moved so the action was cancelled!");
            PVP.playersWaiting.remove(player.getName()); //Remove the player from the waiting list
        }
    }
}