[英]How do I update a JLabel in a JPanel?
我在獲取JLabel上的圖像以在JPanel中更新時遇到麻煩。 我看不出問題是什么。 我曾嘗試刪除現有的JLabel並將一個新的JLabel添加到JPanel,但這是行不通的。 這是我要讓動畫開始工作的代碼。 我的關鍵偵聽器工作正常,因此我可以確定此類中存在一些問題:
import javax.swing.*;
import java.awt.event.*;
public class Character extends JPanel{
//Constructs array that holds running frames
static ImageIcon running[] = new ImageIcon[19];
static int i = 0;
//Contstructs label that holds the current image frame
static JLabel characterLabel = new JLabel();
//Creates imageicon to be returned to the character and stored in characterLabel
static ImageIcon character = new ImageIcon();
Timer runningTimer = new Timer(300, new RunningListener());
public Character() {
running[0] = new ImageIcon("running 1.png");
running[1] = new ImageIcon("running 2.png");
running[2] = new ImageIcon("running 3.png");
running[3] = new ImageIcon("running 4.png");
running[4] = new ImageIcon("running 5.png");
running[5] = new ImageIcon("running 6.png");
running[6] = new ImageIcon("running 7.png");
running[7] = new ImageIcon("running 8.png");
running[8] = new ImageIcon("running 9.png");
running[9] = new ImageIcon("running 10.png");
running[10] = new ImageIcon("running 11.png");
running[11] = new ImageIcon("running 12.png");
running[12] = new ImageIcon("running 13.png");
running[13] = new ImageIcon("running 14.png");
running[14] = new ImageIcon("running 15.png");
running[15] = new ImageIcon("running 16.png");
running[16] = new ImageIcon("running 17.png");
running[17] = new ImageIcon("running 18.png");
running[18] = new ImageIcon("running 19.png");
characterLabel.setIcon(running[0]);
this.add(characterLabel);
}
private void refreshCharacter(){
this.remove(characterLabel);
characterLabel.setIcon(running[i]);
this.add(characterLabel);
i++;
if (i > 18){
i = 0;
}
}
private class RunningListener implements ActionListener{
public void actionPerformed(ActionEvent e) {
refreshCharacter();
}
}
}
我想這個JPanel也可能是問題,但我對此表示懷疑:
import javax.swing.*;
//Panel that manages the game
public class GamePanel extends JPanel{
//Adds stuff to GamePanel to send to Frame
public GamePanel(){
this.addKeyListener(new KeyInput());
this.add(new Character());
}
}
這是關鍵的偵聽器:
import java.awt.event.*;
//Listens for key actions
public class KeyInput implements KeyListener{
//Constructs character
Character c = new Character();
public void keyPressed(KeyEvent evt) {
int key = evt.getKeyCode();
//When the right key is pressed, start the timer that starts the running animation
if(key == KeyEvent.VK_RIGHT){
c.runningTimer.start();
}
}
public void keyReleased(KeyEvent evt){
int key = evt.getKeyCode();
//When the right key is released, the timer that starts the running animation is stopped
if(key == KeyEvent.VK_RIGHT){
c.runningTimer.stop();
}
}
//There is no use for this... it just has to be there
public void keyTyped(KeyEvent evt){
}
}
這是框架:
import javax.swing.*;
public class Frame{
//Creates window and calls to GamePanel
public static void main (String[]args){
GamePanel gamePanel = new GamePanel();
JFrame window = new JFrame("Game");
window.add(gamePanel);
window.setLocation(50,50);
window.setSize(1000,650);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.setVisible(true);
gamePanel.requestFocus();
}
}
如果要更改顯示的圖像,請避免刪除JLabel或組件,而要交換JLabel的圖標,如果可以避免的話。 如果您不是要更改圖像,而是要做一些不同的事情,那么請給我們提供有關您想要的行為的更多詳細信息,因為您告訴我們的只是您正在嘗試“動畫”,而且范圍還很廣。
例如,
private void refreshCharacter() {
i++;
i %= running.length;
characterLabel.setIcon(running[i]);
}
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