如何使用线程显示动画GIF图像

时间:2011-10-11 09:41:34

标签: java multithreading swing

我正在尝试使用下面的方法实现图像,这样当执行发送操作时,GIF图像应该在指定的时间内显示(由threadRunner暂停方法实现)。

问题是它没有显示出来。在测试时,当我禁用stop()时,它与delIveryReport Textarea同时出现,而不应该是。我该如何解决这个问题。

 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);


        } 

THREADRUNNER

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);
    } 

2 个答案:

答案 0 :(得分:2)

在我看来,您的应用程序正在执行EDT上的实际工作,而您的线程负责显示和隐藏进度标签。我可能错了,但如果是这样的话,那么我建议你做的与你正在做的完全相反。更新SWING组件只能从EDT(事件调度线程)而不是其他线程完成。

如果这是一个SWING桌面应用程序,那么我的建议是你看一下SwingWorker,这是一个专门设计用来处理长时间运行的任务但没有阻止EDT的类。然后你可以做下面概述的事情(我的代码可能不会100%编译,但它应该让你知道我的意思。

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.
    }
}

关于你的问题:只需将动画gif设置为JLabel的图标 - 并且SWING应该负责显示它。只要您的SMS发送代码在另一个线程上运行,SWING就应该能够呈现GIF动画,而不会被SMS发送代码阻止。

答案 1 :(得分:1)

你必须将label.setVisible(true);包裹到invokeLater();

您已从Swing代码中移除Thread.sleep(int)因为阻止了EDT,然后您遇到Concurency in Swing问题,请创建一个新的void / clas .. ThreadRunnable开始,在此代码块中,您可以使用Thread.sleep(int)暂停流程,并将此处label.setVisible(true);包含在invokeLater();

动画或延迟Swing所需使用javax.swing.Timer

中的任何操作