我最近的所有动画项目都一直遇到这个问题。每次我运行动画时，它们似乎从来没有完全可见和完整，而是闪烁和闪烁，类似于没有完全拧入的灯泡（我知道，奇怪的比较，但我想不出它还像什么）。我觉得它一定与我放置重绘（）有关;但我现在不确定。在我之前制作的动画中，问题是我的"私有 BufferedImage offScr" 变量设置不正确，但是查看与我现在正在处理的程序类似的其他程序，我不明白为什么需要该变量。感谢您的所有帮助，对于我缺乏编程词汇知识，我深表歉意。
这是我到目前为止的程序：
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
public class DoveAnimator extends JFrame implements ActionListener {
private int DELAY = 40; // the delay for the animation
private final int WIDTH = 400; // the window width
private final int HEIGHT = 180; // the window height
private final int IMAGEAMT = 8;
private Image [] doveLeft = new Image[IMAGEAMT];
private Image [] doveRight = new Image[IMAGEAMT];
private int doveIndex = 0;
private boolean isRight = true;
private JPanel dovePanel;
private Image dove;
private JButton slowerButton = new JButton ("Slower");
private JButton fasterButton = new JButton ("Faster");
private JButton reverseButton = new JButton ("Reverse");
private JButton pauseResumeButton = new JButton (" pause ");
private Timer timer;
private int clicks = 2;
private boolean pause = false;
/** The constructor */
public DoveAnimator() {
MediaTracker track = new MediaTracker(this);
for (int i = 0; i < IMAGEAMT; ++i) {
doveLeft[i] = new ImageIcon("doves/ldove" + (i+1) + ".gif").getImage();
doveRight[i] = new ImageIcon("doves/rdove" + (i+1) + ".gif").getImage();
track.addImage(doveLeft[i],0);
track.addImage(doveRight[i],0);
}
// dove = doveRight[0];
//track.addImage(bkgImage,0);
// track.addImage(dove,0);
try {
track.waitForAll();
} catch ( InterruptedException e ) { }
dove = doveRight[0];
JPanel mainPanel = new JPanel();
mainPanel.setPreferredSize(new Dimension(WIDTH, HEIGHT));
setTitle ("Dove Animator");
dovePanel = new JPanel();
dovePanel.setPreferredSize(new Dimension(100, 125));
dovePanel.setBackground(Color.WHITE);
mainPanel.add(dovePanel);
JPanel buttonPanel = new JPanel();
buttonPanel.setPreferredSize(new Dimension(WIDTH, 40));
// button 1
slowerButton.addActionListener (this);
buttonPanel.add (slowerButton);
// button 2
fasterButton.addActionListener (this);
buttonPanel.add (fasterButton);
// button 3
reverseButton.addActionListener (this);
buttonPanel.add (reverseButton);
// button 4
pauseResumeButton.addActionListener (this);
buttonPanel.add (pauseResumeButton);
mainPanel.add(buttonPanel);
add(mainPanel);
setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
setVisible (true);
pack();
timer = new Timer(DELAY,this); // setting timer delay
timer.start(); // start the timer
}
public void switchDove() {
++doveIndex;
if (doveIndex >= IMAGEAMT)
doveIndex = 0;
if (isRight)
dove = doveRight[doveIndex];
else
dove = doveLeft[doveIndex];
dove = (isRight) ? doveRight[doveIndex] : doveLeft[doveIndex];
}
/** Handler for button clicks and timer events */
public void actionPerformed (ActionEvent evt) {
if (evt.getSource() == slowerButton)
{
DELAY += 10;
}
else if (evt.getSource() == reverseButton)
{
if(evt.getSource() == reverseButton && isRight == true){
isRight = false;
}
else if(evt.getSource() == reverseButton && !isRight){
isRight = true;
}
}
else if (evt.getSource() == fasterButton)
{
DELAY -= 10;
if (DELAY <= 10 ){
DELAY = 10;
}
}
else if (evt.getSource() == pauseResumeButton)
{
if(evt.getSource() == pauseResumeButton && !pause){
pauseResumeButton.setText(" Resume ");
timer.stop();
pause = true;
}
else if(evt.getSource() == pauseResumeButton && pause == true){
pauseResumeButton.setText(" Pause ");
timer.start();
pause = false;
}
}
else if (evt.getSource() == timer)
{
drawAnimation();
switchDove();
repaint();
}
}
/** Draws the dove in the dovePanel */
public void drawAnimation() {
Graphics page = dovePanel.getGraphics();
page.drawImage(dove,0,0,Color.WHITE,null);
}
/** The main method */
public static void main (String [] args) {
new DoveAnimator();
}
}
是的，这似乎是您的 repaint（） 调用之一。在这里取出你的 repaint（） 方法调用：
else if (evt.getSource() == timer)
{
drawAnimation();
switchDove();
repaint();
这让程序感到困惑，因为你已经在切换鸽子了。这是我最好的猜测。我运行了它，但它似乎有效。干杯！
另外，我刚刚注意到您调整计时器的方式不会让您大喊大叫。您需要使用以下命令： timer.setDelay(newDelay);您也可以将参数放在括号中，例如timer.setDelay(DELAY -= 10);