如何使用线程显示动画GIF图像

Question

我正在尝试使用以下方法实现图像，以便在执行send操作时，GIF图像应在指定的时间内显示（由threadRunner pause方法实现）。

问题是它没有显示。在测试中，当我禁用stop（）时，它与delIveryReport Textarea同时出现，而不应该出现。我该如何解决。

 private void sendActionPerformed(java.awt.event.ActionEvent evt) {

            threadRunner t = new threadRunner();
            String fone = "";
            SendSMS sms = new SendSMS();
            String[] arMSISDN = msisdn.split(",");
            for (int i = 0; i < arMSISDN.length; i++) {

                fone = arMSISDN[i];
                fone = fone.trim();
                try {

                    Cursor cursor = new Cursor(Cursor.WAIT_CURSOR);
                    setCursor(cursor);
                    t.pause(loading);

                    sms.sendSMS(user, pass, fone, senderIDString, msgString);


                } catch (Exception e) {
                    e.printStackTrace();
                } finally {
                    Cursor normal = new Cursor(Cursor.DEFAULT_CURSOR);
                    setCursor(normal);
                    t.stop(loading);
                    deliveryReport.append(fone + ": " + sms.response + "\n");
                }

            }

    //        JOptionPane.showMessageDialog(rootPane, deliveryReport);
            deliveryReport.setVisible(true);
            jScrollPane2.setVisible(true);



            redo.setFont(new java.awt.Font("Tahoma", 1, 11)); // NOI18N
            redo.setForeground(new java.awt.Color(223, 90, 46));
            redo.setText("Would you like to send another Message?");
            yes.setEnabled(true);
            no.setEnabled(true);
            yes.setText("Yes");
            no.setText("No");
            back.setEnabled(false);
            send.setEnabled(false);


        }

穿线器

public void pause(JLabel label){

        try {
            Thread.sleep(5000);
            label.setVisible(true);    
        } catch (InterruptedException ex) {
            Logger.getLogger(threadRunner.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    public void stop(JLabel l){
        l.setVisible(false);
    }

Answer 1

在我看来，您的应用程序正在EDT上进行实际工作，而您的线程负责显示和隐藏进度标签。我可能是错的，但是如果是这样，那么我建议您做的事情与您做的完全相反。仅应从EDT（事件调度线程）完成SWING组件的更新，而不能从其他线程进行更新。

如果这是一个SWING桌面应用程序，那么我的建议是让您看一下SwingWorker，这是一个专门设计用于处理长时间运行的任务而又不会阻塞EDT的类。然后，您可以执行以下概述的操作（我的代码可能无法100％编译，但是它应该使您了解我的意思。

private void sendActionPerformed(java.awt.event.ActionEvent evt) {  
  //implement code to show progress label here
  SMSWorker w = new SMSWorker(user, pass, senderIdString, msgString, msisdn.split(","));
  w.execute();
}

public SMSWorker extends SwingWorker<Void, DeliveryReport> {

  private final String user;
  private final String pass;
  private final String senderIdString;
  private final String msgString;
  private final String[] arMSISDN;

  // this constructor runs on the current (EDT) thread.
  public SMSWorker(String user, String pass, String senderIdString, String msgString, String[] arMSISDN) {
    this.user = user;
    this.pass = pass;
    this.senderIdString = senderIdString;
    this.msgString = msgString;
    this.arMSISDN = arMSISDN;
  }

  // this function runs in a separate thread.
  public Boolean doInBackground() {

       // Instantiate SMS gateway client.
       SendSMS sms = new SendSMS();

       // Assuming a delivery report can be created like this.
       DeliveryReport deliveryReport = new DeliveryReport();

       for (int i = 0; i < arMSISDN.length; i++) {

            fone = arMSISDN[i];
            fone = fone.trim();
            try {
                sms.sendSMS(user, pass, fone, senderIDString, msgString);

            } catch (Exception e) {
                // you can notify users about exception using the publish() method.

            } finally {
                deliveryReport.append(fone + ": " + sms.response + "\n");
            }

        }

        return deliveryReport;

  }

  // this function runs on the current (EDT) thread.
  public void done() {
    try {
      // synchronize worker thread with EDT.
      DeliveryReport deliveryReport = get();
    } catch (Exception e) {
      //implement code to notify user about errors here.
    } finally {
      //implement code to hide progress label here.
    }
}

关于您的问题：只需将动画gif设置为JLabel的图标-
SWING应该注意显示它。只要您的SMS发送代码在另一个线程上运行，SWING应该很高兴能够渲染GIF动画而不会被SMS发送代码阻止。