堆棧內存溢出
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當我的 W 鍵被按下時它不會注冊

[英]when my W key is pressed it doesn't register

 原文  2020-11-17 00:51:16  9   1    java/ swing/ keyboard/ awt/ key-bindings

問題描述

我正在嘗試創建一個游戲，但我的鍵綁定不起作用，我不知道為什么。 如果為圖像圖標提供圖片和圖形數據，則包含的代碼將運行。 運行游戲時，鍵綁定會輸入到鍵映射中，但由於某些奇怪的原因而無法使用。 如果有人對它為什么會這樣做有任何線索，我們將不勝感激。

圖形/用戶界面：

     package Ballerz;
     import java.util.*;
     import java.awt.*;
     import java.awt.event.ActionEvent;
     import java.awt.event.ActionListener;
     import java.awt.event.KeyAdapter;
     import java.awt.event.KeyEvent;
     import java.awt.event.KeyListener;

import javax.swing.*;
import java.io.*;
public class GraphicsPn extends Game{



    public GraphicsPn() throws IOException{
    
    frame.setUndecorated(true);
    frame.setName("Ballerz");
    frame.setIconImage(window.getImage());
    frame.setContentPane(startMenu);
    frame.validate();
            
    startMenu.setLayout(bord);
    startMenu.setPreferredSize(new Dimension(1366, 768));
    //top menu design
    startMenu.add(topMenu);
        topMenu.setPreferredSize(new Dimension(1366, 40));
        topMenu.setBackground(Color.BLACK);
        topMenu.setForeground(Color.WHITE);
        topMenu.setAlignmentX(topMenu.RIGHT_ALIGNMENT);
        topMenu.setLayout(bord);
    setScene.add(topMenu);
        topMenu.setPreferredSize(new Dimension(1366, 40));
        topMenu.setBackground(Color.BLACK);
        topMenu.setForeground(Color.WHITE);
        topMenu.setAlignmentX(topMenu.RIGHT_ALIGNMENT);
        topMenu.setLayout(bord);
        
    topMenu.add(X, bord.EAST);
        X.setLabel("X");
        X.setFont(new Font(title.getName(), Font.ITALIC, 20));
        X.setBackground(Color.BLACK);
        X.setForeground(Color.WHITE);
        X.setSize(new Dimension(50,40));
        X.setFocusPainted(false);
        X.setBorderPainted(false);
        X.doLayout();
                
    startMenu.add(menu, bord.EAST);
    
    ballerz.setIcon(gif);
    ballerz.setPreferredSize(new Dimension(768,768));
    startMenu.add(ballerz, bord.WEST);
        
    //menu Design
    menu.setPreferredSize(new Dimension(598, 700));
    menu.setBackground((Color.BLACK));
    menu.setLayout(grid);
    menu.setAlignmentY(menu.BOTTOM_ALIGNMENT);
    grid.setVgap(30);
    
    menu.add(title);
        title.setForeground(Color.WHITE);
        title.setPreferredSize(new Dimension(598, 150));
        title.setFont(new Font(title.getName(), Font.ITALIC, 70));
    
    menu.add(start);
        start.setBackground(Color.BLACK);
        start.setForeground(Color.WHITE);
        start.setLabel("New Game");
        start.setFocusPainted(false);
        start.setFont(new Font(title.getName(), Font.ITALIC, 25));
        start.setBorderPainted(false);
        start.setSize(598,50);
        start.doLayout();
    menu.add(settings);
        settings.setBackground(Color.BLACK);
        settings.setForeground(Color.WHITE);
        settings.setLabel("Settings");
        settings.setFocusPainted(false);
        settings.setFont(new Font(title.getName(), Font.ITALIC, 25));
        settings.setBorderPainted(false);
        settings.setSize(598,50);
        settings.doLayout();
        
    menu.add(help);
        help.setBackground(Color.BLACK);
        help.setForeground(Color.WHITE);
        help.setLabel("How to Play");
        help.setFocusPainted(false);
        help.setFont(new Font(title.getName(), Font.ITALIC, 25));
        help.setBorderPainted(false);
        help.setSize(598,50);
        help.doLayout();
    menu.add(exit);
        exit.setBackground(Color.BLACK);
        exit.setForeground(Color.WHITE);
        exit.setLabel("Exit");
        exit.setFocusPainted(false);
        exit.setFont(new Font(title.getName(), Font.ITALIC, 25));
        exit.setBorderPainted(false);
        exit.setSize(598,50);
        exit.doLayout();
        
        
        
        
    menu.add(source);
        source.setFont(new Font(title.getName(), Font.ITALIC, 12));
    //help design
        helpScene.setPreferredSize(new Dimension(1366, 768));
        helpScene.setBackground(Color.BLACK);
        helpScene.add(topMenu);
        
    ActionListener clic = new ActionListener(){ public void actionPerformed(ActionEvent e) {
        if(e.getSource().equals(help)){
            frame.setContentPane(helpScene);
            frame.revalidate();
            frame.repaint();
            helpScene.requestFocus();
            helpScene.addKeyListener(new KeyAdapter() {
                public void keyPressed(KeyEvent e) {
                    helpScene.requestFocus();
                    System.out.println("pressed " + e.getKeyCode());
                    if (e.getKeyCode() == KeyEvent.VK_ESCAPE) {
                        frame.setContentPane(startMenu);
                        frame.repaint();
                    }
        }});
            frame.repaint();
            }
        if(e.getSource().equals(start)){
            frame.setContentPane(game);
            frame.invalidate();
            frame.revalidate();
            game.requestFocus();
            frame.repaint();
            
        }
        if(e.getSource().equals(settings)){
            frame.setContentPane(setScene);
            setScene.setBackground(Color.BLACK);
            setScene.requestFocus();
            setScene.addKeyListener(new KeyAdapter() {
                public void keyPressed(KeyEvent e) {
                    setScene.requestFocus();
                    System.out.println("pressed " + e.getKeyCode());
                    if (e.getKeyCode() == KeyEvent.VK_ESCAPE) {
                        frame.setContentPane(startMenu);
                        frame.repaint();
                    }
                    
        }});
            frame.repaint();
            }
            
        if(e.getSource().equals(X)) {
            frame.setContentPane(startMenu);
            frame.revalidate();
            frame.repaint();
        }
        if(e.getSource().equals(exit)){
            System.exit(0);
        }
    }};
    exit.addActionListener(clic);
    X.addActionListener(clic);
    start.addActionListener(clic);
    help.addActionListener(clic);
    settings.addActionListener(clic);
    
    frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
    frame.setVisible(true);
    frame.setBackground(Color.black);
    startMenu.setVisible(true);
    
    
    
}
}

游戲部分：

    package Ballerz;

import java.util.*;
import java.awt.*;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import javax.imageio.ImageIO;
import javax.swing.*;
import java.io.*;
import java.lang.*;



public class Game extends JPanel {

public int x;
public int y;
public int x2;
public int y2;
public double dis1;
public double dis2;

public JLayeredPane game = new JLayeredPane();
public JPanel players = new JPanel();
JFrame frame = new JFrame();
JLabel ballerz = new JLabel();

public JPanel startMenu = new JPanel();
JPanel helpScene = new JPanel();
JPanel setScene = new JPanel();

JLabel title = new JLabel("Ballerz", JLabel.CENTER);
JLabel source = new JLabel("Gif by ShotoPop: https://media.giphy.com/media/3DrHrnC0JMotPiopno/giphy.gif", JLabel.CENTER);

JPanel menu = new JPanel();
JButton help = new JButton();
JButton start = new JButton();
JButton settings = new JButton();
JButton exit = new JButton("Exit");

JTextArea space1 = new JTextArea();

JPanel topMenu = new JPanel();
JButton X = new JButton();

JLabel space = new JLabel();

JLabel p2 = new JLabel();

public Image player1 = ImageIO.read(new File("C:\\Users\\Adam\\Downloads\\JavaCode\\Ballerz\\src\\tempdude.png"));

ImageIcon window = new ImageIcon("C:\\Users\\Adam\\Downloads\\JavaCode\\Ballerz\\src\\basketball dude.PNG");
ImageIcon gif = new ImageIcon("C:\\Users\\Adam\\Downloads\\JavaCode\\Ballerz\\src\\Ballerz.gif");
ImageIcon court = new ImageIcon("C:\\Users\\Adam\\Downloads\\JavaCode\\Ballerz\\src\\court.png");
ImageIcon player1s = new ImageIcon("C:\\Users\\Adam\\Downloads\\JavaCode\\Ballerz\\src\\tempdude.png");

public FlowLayout flow = new FlowLayout();
public BorderLayout bord = new BorderLayout();
public GridLayout grid = new GridLayout(6, 1);

JLabel ply1 = new JLabel();
JLabel ply2 = new JLabel();

public Game() throws IOException {
    game.setLayout(bord);
    game.setPreferredSize(new Dimension(1366, 768));
    JLabel cort = new JLabel();
    cort.setSize(new Dimension(1366, 768));
    cort.setIcon(court);

    players.setOpaque(false);
    players.setLayout(bord);
    players.setBackground(Color.pink);

    ply1.setIcon(player1s);
    ply1.setSize(new Dimension(200, 200));
    ply1.setVisible(true);
    ply1.setBackground(Color.black);
    ply2.setIcon(player1s);
    ply2.setSize(new Dimension(200, 200));
    ply2.setVisible(true);
    ply2.setBackground(Color.black);
    players.add(ply1);
    players.add(ply2);
    players.setSize(new Dimension(1340, 820));
    players.repaint();
    players.setLayout(null);
    ply2.setLocation(15, 410);
    ply1.setLocation(1230, 410);
    players.repaint();
    players.setVisible(true);
    players.setAlignmentX(CENTER_ALIGNMENT);
    
    game.add(cort, bord.CENTER,5);
    game.add(players,0);
    players.setLocation(0, -50);
    
    game.repaint();
    
}



public static void main(String[] arg) throws Exception {
    GraphicsPn g = new GraphicsPn();
    Game game = new Game();
    keys li = new keys();
}


}

鍵綁定：

package Ballerz;

import java.awt.event.ActionEvent;
import java.io.IOException;
import javax.swing.*;
public class keys extends Game{

public keys() throws IOException {
    
    
    AbstractAction wAction = new AbstractAction() {
        @Override
        public void actionPerformed(ActionEvent e) {
            System.out.println("BOI");
            
            if (ply2.getLocation().getY() <= 650 && ply2.getLocation().getY() >= 10) {
                ply2.setLocation((int) ply2.getLocation().getX(), (int) ply2.getLocation().getY() + 10);
                
                System.out.println(ply2.getLocation());
            } 
                if (ply2.getLocation().getY() > 650)
                    ply2.setLocation((int) ply2.getLocation().getX(), 650);
                    players.repaint();
            
            if (ply2.getLocation().getY() < 10) {
                ply2.setLocation((int) ply2.getLocation().getX(), 10);
                players.repaint();
            }
            players.repaint();
        
        }
    };
    
    players.getInputMap().put(KeyStroke.getKeyStroke('w'), "wAction");
    players.getActionMap().put("wAction", wAction );
    
}
}

1 個解決方案

解決方案1
 0  2020-11-17 08:16:43

您聲稱您的鍵綁定不起作用，這意味着您在問題中發布的大量代碼中唯一相關的部分是最后兩行，即

players.getInputMap().put(KeyStroke.getKeyStroke('w'), "wAction");
players.getActionMap().put("wAction", wAction );

其中players是一個JPanel 。

所以基本上你的問題歸結為：

JPanel 的鍵綁定不起作用

這個問題已經在堆棧溢出上被問過和回答過很多次了
嘗試使用 Google 搜索 Internet 中的術語

jpanel 鍵綁定站點：stackoverflow.com

第一個結果（超過 2000 個）是JPanel 對 KeyBindings 沒有反應

基本上你需要

  1. 確保players是可聚焦的，因為默認情況下， JPanel不是。
  2. 確保使用正確的輸入映射

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