java – 如何从线程更新blackberry UI项？

public class PlayText extends Thread {

   private int duration;
   private String text;
   private PlayerScreen playerscrn; 

   public PlayText(String text, int duration) {
        this.duration = duration;
        this.text = text;
        this.playerscrn = (PlayerScreen)UiApplication.getUiApplication().getActiveScreen();
   }



    public void run() {
        synchronized(UiApplication.getEventLock()) {
            try{
                RichTextField text1player = new RichTextField(this.text, Field.NON_FOCUSABLE);
                playerscrn.add(text1player);
                playerscrn.invalidate();

                Thread.sleep(this.duration);

                RichTextField text2player = new RichTextField("hahhaha", Field.NON_FOCUSABLE);
                playerscrn.add(text2player);
                playerscrn.invalidate();

                Thread.sleep(1000);
                RichTextField text3player = new RichTextField("Done", Field.NON_FOCUSABLE);
                playerscrn.add(text3player);
                playerscrn.invalidate();

            }catch(Exception e){
             System.out.println("I HAVE AN ERROR");
            }   
        }
    }
}

使用上面的代码,我正在尝试创建一个小型文本播放器.
而是逐个获取所有文本标签,例如

显示text1player
等待this.duration毫秒
显示text2player
等待1000毫秒
显示text3player
线程完成.

屏幕等待this.duration 1000毫秒并一次显示所有标签.
我尝试使用runnable并调用.invokeLater或.invokeAndWait,但我仍然得到相同的行为,即使我像上面那样使用synchronized变脏,它仍然不起作用.

有谁知道我如何一次显示每个标签？

谢谢！

解决方法:

尝试在sleep语句之间移动同步…也许它没有显示,因为你已经获得了锁定,并且在你睡觉时UI线程无法更新.

当您的线程正在睡眠时,您是否在UI中看到延迟或无响应？试试这种方式：

public class PlayText extends Thread {

   private int duration;
   private String text;
   private PlayerScreen playerscrn; 

    public PlayText(String text, int duration) {
        this.duration = duration;
        this.text = text;
        this.playerscrn = (PlayerScreen)UiApplication.getUiApplication().getActiveScreen();
    }

    private void displayTextLabel(string textToDisplay){
        synchronized(UiApplication.getEventLock()) {
            playerscrn.add(new RichTextField(textToDisplay, Field.NON_FOCUSABLE));
            playerscrn.invalidate();
        }
    }

    public void run() {

            try{

                displayTextLabel(this.text);
                Thread.sleep(this.duration);

                displayTextLabel("hahhaha");
                Thread.sleep(1000);

                displayTextLabel("Done");

            }catch(Exception e){
             System.out.println("I HAVE AN ERROR");
            }   
        }
    }
}

标签：java,uilabel,multithreading,blackberry
来源： https://codeday.me/bug/20190607/1191177.html