我正在开发一个精灵移动器，但它似乎不起作用，有人能看看并告诉我出了什么问题吗？它应该通过KeyListener来使用箭头键移动精灵，但是，我的移动功能只能向上移动，不能向其他方向移动，请帮忙。
package moving.sprite;
import java.awt.Component;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.SpringLayout;
/**
*
* @author c
*/
public class MovingSprite implements KeyListener,
ActionListener{
/**
* @param args the command line arguments
*
*/
// Make a sprite movable around the window by using the arrow keys
// Data : Used for paths for the File object
// Stills
private static String fstill = "C:\Users\c\Documents\NetBeansProjects\Moving Sprite\src\Sprite Images\Stills\Front.png";
private static String bstill = "C:\Users\c\Documents\NetBeansProjects\Moving Sprite\src\Sprite Images\Stills\Back.png";
private static String lstill = "C:\Users\c\Documents\NetBeansProjects\Moving Sprite\src\Sprite Images\Stills\Left.png";
private static String rstill = "C:\Users\c\Documents\NetBeansProjects\Moving Sprite\src\Sprite Images\Stills\Right.png";
//
// Walking
private static String fwalk = "C:\Users\c\Documents\NetBeansProjects\Moving Sprite\src\Sprite Images\Walking\Front.png";
private static String bwalk = "C:\Users\c\Documents\NetBeansProjects\Moving Sprite\src\Sprite Images\Walking\Back.png";
private static String lwalk = "C:\Users\c\Documents\NetBeansProjects\Moving Sprite\src\Sprite Images\Walking\Left.png";
private static String rwalk = "C:\Users\c\Documents\NetBeansProjects\Moving Sprite\src\Sprite Images\Walking\Right.png";
//
// Movement position
private static int moved = 0;
private static int xa = 0;
private static int ya = 0;
private static String j;
private static String direction;
// 0 = front
// 1 = back
// 2 = left
// 3 = right
//
// Gui Constructors
private static JFrame mainframe;
private static Container contentPane;
private static SpringLayout layout;
private static Component frame;
private static BufferedImage img;
private static ImageIcon iconb;
private static JLabel lab;
private static JFrame mainframeb;
private static JButton upb;
private static JButton downb;
private static JButton leftb;
private static JButton rightb;
public static void main(String[] args) {
runthis();
}
private static void messagep ( String message ) {
JOptionPane.showMessageDialog(frame,
message);
}
private static void changesprite(String pos) {
j = pos;
img = null;
try {
img = ImageIO.read(new File(j));
} catch (IOException e) {
}
iconb = new ImageIcon(img, "Sprite");
lab.setIcon(iconb);
}
private static void reset() {
xa = 0;
ya = 0;
lab.setLocation(xa, ya);
System.out.println("Reset!");
}
private static void move() {
lab.setLocation(xa, ya);
if ( moved == 1 ) {
// Down, works
changesprite(fstill);
ya = (lab.getLocationOnScreen().y);
xa = (lab.getLocationOnScreen().x*2*(-(1)));
lab.setLocation(xa, ya);
System.out.println("Down : (" + xa + " , " + ya + " ) ");
}
if ( moved == 0 ) {
// Backwards,
changesprite(bstill);
ya = (lab.getLocationOnScreen().y)-2;
xa = (lab.getLocationOnScreen().x);
lab.setLocation(xa, ya);
System.out.println("Up : (" + xa + " , " + ya + " ) ");
}
if ( moved == 2 ) {
changesprite(lstill);
}
if ( moved == 3 ) {
changesprite(rstill);
}
lab.setLocation(xa, ya);
}
private static void runthis() {
messagep("Disclaimer : Sprite's are originally by Nintendo, sprites were ripped by : Silentninja.");
messagep("Program made by : c");
mainframe = new JFrame("Fire Red Sprite");
mainframe.setSize(100, 100);
contentPane = mainframe.getContentPane();
layout = new SpringLayout();
j = fstill;
img = null;
try {
img = ImageIO.read(new File(j));
} catch (IOException e) {
}
iconb = new ImageIcon(img, "Sprite");
lab = new JLabel(iconb);
mainframe.add(lab);
lab.setLocation(100, 100);
mainframeb = new JFrame("Fire Red Moving");
mainframeb.setSize(300, 70);
upb = new JButton("Up");
downb = new JButton("Down");
leftb = new JButton("Left");
rightb = new JButton("Right");
upb.setSize(50, 50);
downb.setSize(50, 50);
leftb.setSize(50, 50);
rightb.setSize(50, 50);
mainframeb.add(upb);
mainframeb.add(downb);
mainframeb.add(leftb);
mainframeb.add(rightb);
contentPane.setLayout(layout);
mainframe.pack();
mainframe.setVisible(true);
mainframeb.setLayout(new FlowLayout (FlowLayout.LEADING));
mainframeb.setVisible(true);
reset();
}
private static void directionassign() {
if ( moved == 2 ) {
direction = "LEFT";
}
if ( moved == 3 ) {
direction = "RIGHT";
}
if ( moved == 1 ) {
direction = "UP";
}
if ( moved == 0 ) {
direction = "DOWN";
}
}
@Override
public void keyTyped(KeyEvent ke) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
@Override
public void keyPressed(KeyEvent ke) {
if(ke.getKeyCode() == KeyEvent.VK_LEFT) moved = 2;
else if(ke.getKeyCode() == KeyEvent.VK_RIGHT) moved = 3;
else if(ke.getKeyCode() == KeyEvent.VK_UP) moved = 1;
else if(ke.getKeyCode() == KeyEvent.VK_DOWN) moved = 0;
move();
directionassign();
System.out.println(moved + " " + direction);
}
@Override
public void keyReleased(KeyEvent ke) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
@Override
public void actionPerformed(ActionEvent ae) {
move();
}
private void displayInfo(KeyEvent e, String keyStatus){
int id = e.getID();
if (id == KeyEvent.KEY_PRESSED) {
char c = e.getKeyChar();
System.out.println(c);
}
}
}/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package moving.sprite;
import java.awt.Component;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.SpringLayout;
/**
*
* @author c
*/
public class MovingSprite implements KeyListener,
ActionListener{
/**
* @param args the command line arguments
*
*/
// Make a sprite movable around the window by using the arrow keys
// Data : Used for paths for the File object
// Stills
private static String fstill = "C:\Users\c\Documents\NetBeansProjects\Moving Sprite\src\Sprite Images\Stills\Front.png";
private static String bstill = "C:\Users\c\Documents\NetBeansProjects\Moving Sprite\src\Sprite Images\Stills\Back.png";
private static String lstill = "C:\Users\c\Documents\NetBeansProjects\Moving Sprite\src\Sprite Images\Stills\Left.png";
private static String rstill = "C:\Users\c\Documents\NetBeansProjects\Moving Sprite\src\Sprite Images\Stills\Right.png";
//
// Walking
private static String fwalk = "C:\Users\c\Documents\NetBeansProjects\Moving Sprite\src\Sprite Images\Walking\Front.png";
private static String bwalk = "C:\Users\c\Documents\NetBeansProjects\Moving Sprite\src\Sprite Images\Walking\Back.png";
private static String lwalk = "C:\Users\c\Documents\NetBeansProjects\Moving Sprite\src\Sprite Images\Walking\Left.png";
private static String rwalk = "C:\Users\c\Documents\NetBeansProjects\Moving Sprite\src\Sprite Images\Walking\Right.png";
//
// Movement position
private static int moved = 0;
private static int xa = 0;
private static int ya = 0;
private static String j;
private static String direction;
// 0 = front
// 1 = back
// 2 = left
// 3 = right
//
// Gui Constructors
private static JFrame mainframe;
private static Container contentPane;
private static SpringLayout layout;
private static Component frame;
private static BufferedImage img;
private static ImageIcon iconb;
private static JLabel lab;
private static JFrame mainframeb;
private static JButton upb;
private static JButton downb;
private static JButton leftb;
private static JButton rightb;
public static void main(String[] args) {
runthis();
}
private static void messagep ( String message ) {
JOptionPane.showMessageDialog(frame,
message);
}
private static void changesprite(String pos) {
j = pos;
img = null;
try {
img = ImageIO.read(new File(j));
} catch (IOException e) {
}
iconb = new ImageIcon(img, "Sprite");
lab.setIcon(iconb);
}
private static void reset() {
xa = 0;
ya = 0;
lab.setLocation(xa, ya);
System.out.println("Reset!");
}
private static void move() {
lab.setLocation(xa, ya);
if ( moved == 1 ) {
// Down, works
changesprite(fstill);
ya = (lab.getLocationOnScreen().y);
xa = (lab.getLocationOnScreen().x*2*(-(1)));
lab.setLocation(xa, ya);
System.out.println("Down : (" + xa + " , " + ya + " ) ");
}
if ( moved == 0 ) {
// Backwards,
changesprite(bstill);
ya = (lab.getLocationOnScreen().y)-2;
xa = (lab.getLocationOnScreen().x);
lab.setLocation(xa, ya);
System.out.println("Up : (" + xa + " , " + ya + " ) ");
}
if ( moved == 2 ) {
changesprite(lstill);
}
if ( moved == 3 ) {
changesprite(rstill);
}
lab.setLocation(xa, ya);
}
private static void runthis() {
messagep("Disclaimer : Sprite's are originally by Nintendo, sprites were ripped by : Silentninja.");
messagep("Program made by : c");
mainframe = new JFrame("Fire Red Sprite");
mainframe.setSize(100, 100);
contentPane = mainframe.getContentPane();
layout = new SpringLayout();
j = fstill;
img = null;
try {
img = ImageIO.read(new File(j));
} catch (IOException e) {
}
iconb = new ImageIcon(img, "Sprite");
lab = new JLabel(iconb);
mainframe.add(lab);
lab.setLocation(100, 100);
mainframeb = new JFrame("Fire Red Moving");
mainframeb.setSize(300, 70);
upb = new JButton("Up");
downb = new JButton("Down");
leftb = new JButton("Left");
rightb = new JButton("Right");
upb.setSize(50, 50);
downb.setSize(50, 50);
leftb.setSize(50, 50);
rightb.setSize(50, 50);
mainframeb.add(upb);
mainframeb.add(downb);
mainframeb.add(leftb);
mainframeb.add(rightb);
contentPane.setLayout(layout);
mainframe.pack();
mainframe.setVisible(true);
mainframeb.setLayout(new FlowLayout (FlowLayout.LEADING));
mainframeb.setVisible(true);
reset();
}
private static void directionassign() {
if ( moved == 2 ) {
direction = "LEFT";
}
if ( moved == 3 ) {
direction = "RIGHT";
}
if ( moved == 1 ) {
direction = "UP";
}
if ( moved == 0 ) {
direction = "DOWN";
}
}
@Override
public void keyTyped(KeyEvent ke) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
@Override
public void keyPressed(KeyEvent ke) {
if(ke.getKeyCode() == KeyEvent.VK_LEFT) moved = 2;
else if(ke.getKeyCode() == KeyEvent.VK_RIGHT) moved = 3;
else if(ke.getKeyCode() == KeyEvent.VK_UP) moved = 1;
else if(ke.getKeyCode() == KeyEvent.VK_DOWN) moved = 0;
move();
directionassign();
System.out.println(moved + " " + direction);
}
@Override
public void keyReleased(KeyEvent ke) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
@Override
public void actionPerformed(ActionEvent ae) {
move();
}
private void displayInfo(KeyEvent e, String keyStatus){
int id = e.getID();
if (id == KeyEvent.KEY_PRESSED) {
char c = e.getKeyChar();
System.out.println(c);
}
}
}
if ( moved == 1 )
不要使用"幻数"。没有人知道"1"是什么意思，在代码中可能需要引用该变量的其他地方很容易出现键入错误。
private static JFrame mainframe;
private static Container contentPane;
private static SpringLayout layout;
private static Component frame;
private static void messagep ( String message ) {
去掉所有的静态变量和方法。这不是设计应用程序的正确方式。
使用键盘检查运动。它解释了使用KeyListener的常见问题，并提出了一种更好的方法，即使用Key Bindings。提供了工作实例。