How to change JFrame icon

我有一个 JFrame，它在标题栏(左边角落)上显示一个 Java 图标。 我想改变我的自定义图标的图标。我应该怎么做呢？

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小开

JFrame.setIconImage(Image image)非常标准。

小开
最佳答案

像下面这样创建一个新的 ImageIcon对象:

ImageIcon img = new ImageIcon(pathToFileOnDisk);

然后用 setIconImage()将它设置为 JFrame:

myFrame.setIconImage(img.getImage());

还要检查 setIconImages()，它取代了 List。

小开

我是这么做的:

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import java.io.File;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;






public class MainFrame implements ActionListener{


/**
*
*/




/**
* @param args
*/
public static void main(String[] args) {
String appdata = System.getenv("APPDATA");
String iconPath = appdata + "\\JAPP_icon.png";
File icon = new File(iconPath);


if(!icon.exists()){
FileDownloaderNEW fd = new FileDownloaderNEW();
fd.download("http://icons.iconarchive.com/icons/artua/mac/512/Setting-icon.png", iconPath, false, false);
}
JFrame frm = new JFrame("Test");
ImageIcon imgicon = new ImageIcon(iconPath);
JButton bttn = new JButton("Kill");
MainFrame frame = new MainFrame();
bttn.addActionListener(frame);
frm.add(bttn);
frm.setIconImage(imgicon.getImage());
frm.setSize(100, 100);
frm.setVisible(true);




}


@Override
public void actionPerformed(ActionEvent e) {
System.exit(0);


}


}

下载者如下:

import java.awt.GridLayout;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileOutputStream;


import java.net.HttpURLConnection;
import java.net.URL;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JProgressBar;


public class FileDownloaderNEW extends JFrame {
private static final long serialVersionUID = 1L;


public static void download(String a1, String a2, boolean showUI, boolean exit)
throws Exception
{


String site = a1;
String filename = a2;
JFrame frm = new JFrame("Download Progress");
JProgressBar current = new JProgressBar(0, 100);
JProgressBar DownloadProg = new JProgressBar(0, 100);
JLabel downloadSize = new JLabel();
current.setSize(50, 50);
current.setValue(43);
current.setStringPainted(true);
frm.add(downloadSize);
frm.add(current);
frm.add(DownloadProg);
frm.setVisible(showUI);
frm.setLayout(new GridLayout(1, 3, 5, 5));
frm.pack();
frm.setDefaultCloseOperation(3);
try
{
URL url = new URL(site);
HttpURLConnection connection =
(HttpURLConnection)url.openConnection();
int filesize = connection.getContentLength();
float totalDataRead = 0.0F;
BufferedInputStream in = new      BufferedInputStream(connection.getInputStream());
FileOutputStream fos = new FileOutputStream(filename);
BufferedOutputStream bout = new BufferedOutputStream(fos, 1024);
byte[] data = new byte[1024];
int i = 0;
while ((i = in.read(data, 0, 1024)) >= 0)
{
totalDataRead += i;
float prog = 100.0F - totalDataRead * 100.0F / filesize;
DownloadProg.setValue((int)prog);
bout.write(data, 0, i);
float Percent = totalDataRead * 100.0F / filesize;
current.setValue((int)Percent);
double kbSize = filesize / 1000;


String unit = "kb";
double Size;
if (kbSize > 999.0D) {
Size = kbSize / 1000.0D;
unit = "mb";
} else {
Size = kbSize;
}
downloadSize.setText("Filesize: " + Double.toString(Size) + unit);
}
bout.close();
in.close();
System.out.println("Took " + System.nanoTime() / 1000000000L / 10000L + "      seconds");
}
catch (Exception e)
{
JOptionPane.showConfirmDialog(
null, e.getMessage(), "Error",
-1);
} finally {
if(exit = true){
System.exit(128);
}


}
}
}
小开

下面是一个对我有效的替代方案:

yourFrame.setIconImage(Toolkit.getDefaultToolkit().getImage(getClass().getResource(Filepath)));

这和公认的答案非常相似。

小开

不幸的是，上面的解决方案并不适用于 Jython 斐济插件。我必须使用 GetProperty动态地构造相对路径。

以下是对我有效的方法:

import java.lang.System.getProperty;
import javax.swing.JFrame;
import javax.swing.ImageIcon;


frame = JFrame("Test")
icon = ImageIcon(getProperty('fiji.dir') + '/path/relative2Fiji/icon.png')
frame.setIconImage(icon.getImage());
frame.setVisible(True)
小开

只需添加以下代码:

setIconImage(new ImageIcon(PathOfFile).getImage());
小开

在我的案例中，super或者 this在我的课堂上引用 JFrame

URL url = getClass().getResource("gfx/hi_20px.png");
ImageIcon imgicon = new ImageIcon(url);
super.setIconImage(imgicon.getImage());
小开

像这样在构造函数中添加以下代码:

public Calculator() {
initComponents();
//the code to be added        this.setIconImage(newImageIcon(getClass().getResource("color.png")).getImage());     }

将“ color. png”更改为要插入的图片的文件名。 将此图片拖放到项目的包(在“源包”下)上。

Run your project.


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