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我有一个 gif 动画图像,它在 jDialog 内显示无限循环加载进度......但是问题是当我加载这个 jDialog 时,父帧代码停止了。?如何做到这一点..这是我的代码..

ProgressDialouge pbDialog = new ProgressDialouge(this);
pbDialog.setVisible(true);
pbDialog.toFront();
postPairs.add(new BasicNameValuePair("PATH","authenticateUser.idoc"));
postPairs.add(new BasicNameValuePair("user_email",email));
postPairs.add(new BasicNameValuePair("user_password",password));
JSONArray jArray = asyncService.sendRequest(postPairs);
 if(jArray != null){
            new NewJFrame().setVisible(true);

            this.setVisible(false);
  }

如果我更改我的 JDiaog 的 ModalityType.MODELESS,它不会停止代码的执行,但它也不会显示进度条..

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2 回答 2

5

您很可能遇到了线程问题,您在 Swing 事件线程上运行长时间运行的任务,从而阻止事件线程更新 GUI。解决方案是使用后台线程,例如 SwingWorker 提供的后台线程。

我的猜测是有问题的行是这一行:

JSONArray jArray = asyncService.sendRequest(postPairs);

再次,在后台线程中执行此操作。有关这方面的更多信息,请查看此链接:Swing 中的并发

例如:

import java.awt.Point;
import java.awt.Window;
import java.awt.event.ActionEvent;

import javax.swing.*;

public class ShowSwingWorker {
   private JPanel mainPanel = new JPanel();
   private JButton myBtn = null;
   private ProgressDialouge pbDialog = null;

   public ShowSwingWorker() {
      myBtn = new JButton(new AbstractAction("Push Me") {

         @Override
         public void actionPerformed(ActionEvent evt) {
            JButton source = (JButton) evt.getSource();
            source.setEnabled(false); // disable button
            Window win = SwingUtilities.getWindowAncestor(source);
            new MySwingWorker().execute(); // start background thread

            if (pbDialog == null) {
               pbDialog = new ProgressDialouge(win);               
               pbDialog.pack();
               pbDialog.setLocationRelativeTo(win);
               Point loc = pbDialog.getLocation();
               pbDialog.setLocation(loc.x - 100, loc.y - 100);
            }
            pbDialog.setVisible(true);
            // pbDialog.toFront();
         }
      });

      mainPanel.add(myBtn);
   }

   public JComponent getMainPanel() {
      return mainPanel;
   }

   private class MySwingWorker extends SwingWorker<Void, Void> {
      @Override
      protected Void doInBackground() throws Exception {
         Thread.sleep(4000); // emulate a long-running task

         // postPairs.add(new BasicNameValuePair("PATH",
         // "authenticateUser.idoc"));
         // postPairs.add(new BasicNameValuePair("user_email", email));
         // postPairs.add(new BasicNameValuePair("user_password", password));
         // JSONArray jArray = asyncService.sendRequest(postPairs);
         // if (jArray != null) {
         // new NewJFrame().setVisible(true);
         //
         // this.setVisible(false);
         // }
         return null;
      }

      @Override
      protected void done() {
         // Here you change your display.
         // you were swapping JFrames, but I recommend that you instead change views.
         myBtn.setEnabled(true);
         pbDialog.setVisible(false);
      }
   }

   private class ProgressDialouge extends JDialog {

      public ProgressDialouge(Window win) {
         super(win, "MyDialog", ModalityType.APPLICATION_MODAL);
         JProgressBar pBar = new JProgressBar();
         pBar.setIndeterminate(true);
         add(pBar);
      }

   }

   private static void createAndShowGUI() {
      ShowSwingWorker paintEg = new ShowSwingWorker();

      JFrame frame = new JFrame("ShowSwingWorker");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.getContentPane().add(paintEg.getMainPanel());
      frame.pack();
      frame.setLocationRelativeTo(null);
      frame.setVisible(true);
   }

   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            createAndShowGUI();
         }
      });
   }
}
于 2012-12-28T03:09:42.367 回答
-2

在模态对话框的情况下, pbDialog.setVisible(true) 行将阻塞,直到对话框被关闭。如果你想让对话框打开而不阻塞,你必须使它成为非模态的。使您的动画无法正常工作的原因可能是由于编写了同步代码来重新绘制对话框。您需要利用 EventQueue 定期重绘帧。您可以使用单独的线程,或者您可以使用一些不需要这样线程的更简单的代码:

public void paintComponent(Graphics g) {
    if( animate ) {
       Graphics2D g2d = (Graphics2D)g;
       BufferedImage frame = frames[currentFrame];
       g2d.drawImage(frame, null, x, y);
       frame.draw( g );
       currentFrame = (currentFrame + 1) % frames.length;
       repaint(); // this call will schedule a repaint at some point later.
    }
}

这不需要线程,这在资源方面是一件好事,而且不太可能搞砸和违反 Swing 的单线程规则。您还可以查看:

http://docs.oracle.com/javase/6/docs/api/java/awt/Graphics2D.html#drawImage(java.awt.Image , java.awt.geom.AffineTransform, java.awt.image.ImageObserver)

用于在动画 gif 等内容上执行动画。

于 2012-12-28T03:15:40.297 回答