只在PlayerMoveEvent中执行p.sendMessage一次

Question

当playerMoveEvent执行时，每次走路时都会发送取消消息。是否有可能只发送一次？

这里的主类：

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; 
    } 

} 

与听者类：

package me.mortadelle2.togglePVP; 

import org.bukkit.ChatColor; 
import org.bukkit.entity.Player; 
import org.bukkit.event.EventHandler; 
import org.bukkit.event.Listener; 
import org.bukkit.event.entity.EntityDamageByEntityEvent; 
import org.bukkit.event.player.PlayerMoveEvent; 

public class MainEvents implements Listener { 

    PVP getter; 

    public MainEvents(PVP plugin){ 

     plugin.getServer().getPluginManager().registerEvents(this, plugin); 

     this.getter = plugin; 

    } 

    @EventHandler 
    public void playerDamagesWhenToggledOff(EntityDamageByEntityEvent e){ 

     Player victim = (Player) e.getEntity(); 
     Player damager = (Player) e.getDamager(); 

     if (getter.noPVP.contains(victim) || getter.noPVP.contains(damager)){ 
      e.setCancelled(true); 
     } 

    } 

    @EventHandler 
    public void playerMovesSoCancelsTask(PlayerMoveEvent e){ 
     Player p = e.getPlayer(); 

     getter.stepCounter.put(p.getName(), 1); 

     if (getter.stepCounter.get(p.getName()) == 1){ 

     if (e.getTo().getBlockX() != e.getFrom().getBlockX() || e.getTo().getBlockY() != e.getFrom().getBlockY() 
       || e.getTo().getBlockZ() != e.getFrom().getBlockZ()){ 

      getter.getServer().getScheduler().cancelTask(getter.turnOn); 
      getter.getServer().getScheduler().cancelTask(getter.turnOff); 
      p.sendMessage(ChatColor.RED + "You moved so the action was cancelled!"); 

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

    } 

} 

我试着计算他的脚步，他走路时递增，但是，这并不工作，这样我就可以”不要想象会发生什么。

Answer 1

您可以从删除所有全局变量开始，然后创建一个公共静态ArrayList来保存所有已启用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 

static修饰符将创建一个对象，你可以在整个类的访问，而无需通过做PVP有你的主类的“吸气剂”的实例。[VAR]。您可以删除所有其他全局变量，因为这些变量是静态的，所以可以删除侦听器类中的getter。

解决您的问题您将需要修改您的命令，将玩家在地图上时，他们执行的命令

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; 
} 

您的播放器移动事件应该删除从完全，如果他们改变地图的玩家地点：

1）你施放CommandSender到玩家无需任何检查：

@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 
     } 
    } 
} 

，我注意到一些其他问题。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）在你的听众的方法playerDamagesWhenToggledOff你检查球员本身，而不是他们的名字。一定要使用他们的名字：if (Main.noPVP.containsKey(victim.getName())) { e.setCancelled() }

3）你永远不会从变量中移除玩家，确保你制作一个新的PlayerQuitEvent并从所有全局变量中移除玩家。