本文介绍了为什么显示.GIF图像会不断增加内存?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在显示简单的代码示例.我在Jlabel中显示了gif图像.运行程序时，TASK管理器显示内存正在不断增加.为什么会发生?
i am showing simple code sample. I showed an gif image in a Jlabel. When run the programme, TASK manager shows that memory is increasing continuously. Why it happens?
请尝试此代码...在显示玻璃按钮上，玻璃面板上显示gif图像，并在其中隐藏玻璃按钮，并且该内存将开始增加.单击隐藏玻璃"按钮后，玻璃面板将被隐藏，内存增加将停止.
try this code please... on show glass button, glass panel is shown with gif image and a hide glass button in it and with that memory will be started increasing. On clicking hide glass button, glass panel will be hidden and memory increasing will b stopped.
@mKorbel:我已经调试了它，构造函数将被调用一次，因此无需重新初始化JFrame并包括:setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
@mKorbel : I had debugged it, the constructor will be called once, so no re-initializing of JFrame and also included : setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
public class circle extends JFrame {
public ImageIcon pic;
final JPanel glass;
public JButton glass_show;
public JButton hide_glass;
public circle() {
super("Hi shamansdsdsd");
setSize(500, 300);
// Image icon initialize once :
pic = new ImageIcon("images/loadinag.gif");
glass_show = new JButton("Show Glass panel");
this.add(glass_show);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
glass = (JPanel) this.getGlassPane();
hide_glass = new JButton("Hide Glass panel");
glass.add(hide_glass);
glass.add(new JLabel(pic));
glass.setOpaque(false);
}
public void initialize_listeners(){
glass_show.addActionListener(new ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent A) {
glass.setVisible(true);
}
});
hide_glass.addActionListener(new ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent A) {
glass.setVisible(false);
}
});
}
public static void main(String[] args) {
circle mFrame = new circle();
mFrame.initialize_listeners();
mFrame.setVisible(true);
}
}
推荐答案
Java中存在动画GIF图像的错误.其他图像不会增加内存.
There is a bug in Java with animated GIF images. There is no memory increase with other images.
编辑;
下面的示例运行时没有内存泄漏；但您需要 Eclipse SWT库来自 Eclipse的站点
Below example runs without memory leak; but you need Eclipse SWT library from Eclipse's site
import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.ImageLoader;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Shell;
public class GIFExample {
static Display display;
static Shell shell;
static GC shellGC;
static Color shellBackground;
static ImageLoader loader;
static ImageData[] imageDataArray;
static Thread animateThread;
static Image image;
static final boolean useGIFBackground = false;
public static void main(String[] args) {
display = new Display();
shell = new Shell(display);
shell.setSize(300, 300);
shell.open();
shellGC = new GC(shell);
shellBackground = shell.getBackground();
FileDialog dialog = new FileDialog(shell);
dialog.setFilterExtensions(new String[] {"*.gif"});
String fileName = dialog.open();
if (fileName != null) {
loader = new ImageLoader();
try {
imageDataArray = loader.load(fileName);
if (imageDataArray.length > 1) {
animateThread = new Thread("Animation") {
@Override
public void run() {
/* Create an off-screen image to draw on, and fill it with the shell background. */
Image offScreenImage = new Image(display, loader.logicalScreenWidth, loader.logicalScreenHeight);
GC offScreenImageGC = new GC(offScreenImage);
offScreenImageGC.setBackground(shellBackground);
offScreenImageGC.fillRectangle(0, 0, loader.logicalScreenWidth, loader.logicalScreenHeight);
try {
/* Create the first image and draw it on the off-screen image. */
int imageDataIndex = 0;
ImageData imageData = imageDataArray[imageDataIndex];
if (image != null && !image.isDisposed()) image.dispose();
image = new Image(display, imageData);
offScreenImageGC.drawImage(
image,
0,
0,
imageData.width,
imageData.height,
imageData.x,
imageData.y,
imageData.width,
imageData.height);
/* Now loop through the images, creating and drawing each one
* on the off-screen image before drawing it on the shell. */
int repeatCount = loader.repeatCount;
while (loader.repeatCount == 0 || repeatCount > 0) {
switch (imageData.disposalMethod) {
case SWT.DM_FILL_BACKGROUND:
/* Fill with the background color before drawing. */
Color bgColor = null;
if (useGIFBackground && loader.backgroundPixel != -1) {
bgColor = new Color(display, imageData.palette.getRGB(loader.backgroundPixel));
}
offScreenImageGC.setBackground(bgColor != null ? bgColor : shellBackground);
offScreenImageGC.fillRectangle(imageData.x, imageData.y, imageData.width, imageData.height);
if (bgColor != null) bgColor.dispose();
break;
case SWT.DM_FILL_PREVIOUS:
/* Restore the previous image before drawing. */
offScreenImageGC.drawImage(
image,
0,
0,
imageData.width,
imageData.height,
imageData.x,
imageData.y,
imageData.width,
imageData.height);
break;
}
imageDataIndex = (imageDataIndex + 1) % imageDataArray.length;
imageData = imageDataArray[imageDataIndex];
image.dispose();
image = new Image(display, imageData);
offScreenImageGC.drawImage(
image,
0,
0,
imageData.width,
imageData.height,
imageData.x,
imageData.y,
imageData.width,
imageData.height);
/* Draw the off-screen image to the shell. */
shellGC.drawImage(offScreenImage, 0, 0);
/* Sleep for the specified delay time (adding commonly-used slow-down fudge factors). */
try {
int ms = imageData.delayTime * 10;
if (ms < 20) ms += 30;
if (ms < 30) ms += 10;
Thread.sleep(ms);
} catch (InterruptedException e) {
}
/* If we have just drawn the last image, decrement the repeat count and start again. */
if (imageDataIndex == imageDataArray.length - 1) repeatCount--;
}
} catch (SWTException ex) {
System.out.println("There was an error animating the GIF");
} finally {
if (offScreenImage != null && !offScreenImage.isDisposed()) offScreenImage.dispose();
if (offScreenImageGC != null && !offScreenImageGC.isDisposed()) offScreenImageGC.dispose();
if (image != null && !image.isDisposed()) image.dispose();
}
}
};
animateThread.setDaemon(true);
animateThread.start();
}
} catch (SWTException ex) {
System.out.println("There was an error loading the GIF");
}
}
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) display.sleep();
}
display.dispose();
}
}
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