java 更改 jLabel 图标
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Change jLabel icon
提问by phadaphunk
It seems like i'm not the only one with that question but I can't find an answer that solves the problem.
似乎我不是唯一一个有这个问题的人，但我找不到解决问题的答案。
I created a Labeland assign an Iconto it using WYSIWYG interface designer.
Now I want to change the icon dynamically during runtime.
我创建了一个Label并Icon使用WYSIWYG interface designer.
现在我想在运行时动态更改图标。
The logic way would be like this (my first attempt) :
逻辑方式是这样的（我的第一次尝试）：
ImageIcon newIcon = new ImageIcon("SomePath");
jLabel1.setIcon(newIcon);
When I do this the Icon simply disapears from the interface so I googled it and someone said to "flush" the icon whatever this means I tried it :
当我这样做时，图标只是从界面上消失了，所以我用谷歌搜索了它，有人说要“刷新”图标，无论这意味着我尝试过它：
ImageIcon newIcon = new ImageIcon("SomePath");
newIcon.getImage().flush();
jLabel1.setIcon(newIcon);
Still having the same problem.. The icon disapears.
还是有同样的问题。。图标消失了。
What am I doing wrong ?
我究竟做错了什么 ？
Update (Full Method) :
更新（完整方法）：
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
attempted = myEngine.Attempt('q', word);
if(attempted)
{
this.jTextArea1.setText(myEngine.ChangeEncrypt('q', word, this.jTextArea1.getText()));
}
else
{
JOptionPane.showMessageDialog(null,"The Letter Q is not in the word", "Error",JOptionPane.WARNING_MESSAGE);
jButton1.setEnabled(false);
life ++;
ImageIcon newIcon = myEngine.UpdatePicture(life);
newIcon.getImage().flush();
jLabel1.setIcon(newIcon);
}
This is the UpdatePicture Method :
这是 UpdatePicture 方法：
public ImageIcon UpdatePicture(int life)
{
ImageIcon emptyIcon = new ImageIcon();
if (life == 0)
{
ImageIcon iconZero = new ImageIcon("/hang0.gif");
return iconZero;
}
if (life == 1)
{
ImageIcon iconOne = new ImageIcon("/hang1.gif");
return iconOne;
}
if (life == 2)
{
ImageIcon iconTwo = new ImageIcon("/hang2.gif");
return iconTwo;
}
if (life == 3)
{
ImageIcon iconThree = new ImageIcon("/hang3.gif");
return iconThree;
}
if (life == 4)
{
ImageIcon iconFour = new ImageIcon("/hang4.gif");
return iconFour;
}
if (life == 5)
{
ImageIcon iconFive = new ImageIcon("/hang5.gif");
return iconFive;
}
if (life == 6)
{
ImageIcon iconSix = new ImageIcon("/hang6.gif");
return iconSix;
}
return emptyIcon;
}
}
Not sure the whole code was necessary but still it might help.
不确定整个代码是否必要，但它仍然可能有所帮助。
The life variable starts at 0.
I checked and in the UpdatePicture it hits the "/hang1.gif";and returns it.
life 变量从 0 开始。
我检查并在 UpdatePicture 中命中"/hang1.gif";并返回它。
回答by flawyte
If the file is in your srcfolder then :
如果文件在您的src文件夹中，则：
ImageIcon ii = new ImageIcon(getClass().getResource("/myFile.gif"));
回答by gore_obsessed
You really should not put that slash before the name of your icon. It works like that.
你真的不应该把斜线放在你的图标名称之前。它是这样工作的。
回答by Phil Longenecker
I know this is an old question thread, but was having a hell of a time getting a icon replaced on a jLabel when my app was running. This is what finally fixed it: I created a new folder in the source package named images and put the images in there. In my Frame (main class) I added this below the initComponents method:
我知道这是一个旧的问题线程，但是当我的应用程序运行时，在 jLabel 上替换图标很费时间。这就是最终修复它的原因：我在名为 images 的源包中创建了一个新文件夹并将图像放在那里。在我的 Frame（主类）中，我在 initComponents 方法下面添加了这个：
private void moreComponents() {
// get images for initial screen prompts (Skd2_startPanel, loading label1).
// StartPanel is a panel on the Frame that has the loading label on it))
try {
lcImage= new ImageIcon(ImageIO.read(getClass().getResource("/images/LC.png")));
clImage= new ImageIcon(ImageIO.read(getClass().getResource("/images/CL.png")));
} catch (IOException ex) {
Logger.getLogger(Skd2_Frame.class.getName()).log(Level.SEVERE, null, ex);
}
}
LC and CL.png are the images I want as the label icons.
LC 和 CL.png 是我想要作为标签图标的图像。
In a different class I added the following when I wanted the icon to change:
在另一个类中，当我想要更改图标时，我添加了以下内容：
loadingLabel1.setIcon(lcImage); // or clImage as needed.
You'll need the following imports:
您将需要以下导入：
import java.util.logging.Logger;
import javax.imageio.ImageIO;
And add these two declarations just below the variables declarations:
并在变量声明的正下方添加这两个声明：
static ImageIcon lcImage;
static ImageIcon clImage;
Hope this helps someone searching the web for an answer.
希望这有助于有人在网上搜索答案。
