java - JDialog 停止执行父 JFrame

Question

我有一个 gif 动画图像，显示 jDialog 内的无限循环加载进度...但问题是当我加载此 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 JDiaog 的 ModalityType.MODELESS ，它不会停止代码的执行，但也不会显示进度条..

Answer 1

很可能您遇到了线程问题，即您在 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 提供的线程。

我的猜测是，有问题的行是这一行:

JSONArray jArray = asyncService.sendRequest(postPairs);

所以，再次在后台线程中执行此操作。有关更多信息，请查看此链接:Concurrency in Swing

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();
         }
      });
   }
}