j2me使用视频组件进行线程处理

Question

我试图实现一个具有以下结构的java应用程序。

我的问题是

1. 当我从videoplayer线程调用引用线程时，视频仍会在引号表单上播放。

2. 当我使用动作事件更改视频网址时，它只会添加当前新玩家。 恩。当我按下视频2按钮

时，video2会与当前正在运行的video1一起追加

  class VideoPlayer implements Runnable,ActionListener{
      private videoappMidlet MIDlet;
      VideoComponent vc;
      Button Videos,quotes,video1,video2,video3;
      Form videoplayer;
      Thread thread;
      public VideoPlayer(videoappMidlet MIDlet){
        this.MIDlet = MIDlet;
      }

      public void run(){
      try{
        videoplayer=new Form();
        video1=new Button("video1");
        .......

        vc = VideoComponent.createVideoPeer("http://localhost/video1.mpg");
        vc.start();

        quotes.addActionListener((ActionListener) this);
        ........

        videoplayer.addComponent(vc);
        ........

        videoplayer.show();

       }catch(Exception error){
        System.err.println(error.toString());
       }
      }

      public void start(){
       thread = new Thread(this);
       try{ thread.start();}
       catch(Exception error){}
      }

      public void actionPerformed(ActionEvent ae) {
          if((ae.getSource()==Quotes))
          {
              Quotes tp = new Quotes(this.MIDlet);
              tp.start();
          }
          if(ae.getSource()==video1)
          {
                try {
                    vc = VideoComponent.createVideoPeer("http://localhost/video1.mpg");
                    vc.start();
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
          }
          ....
      }

    }


    class Quotes implements Runnable,ActionListener {
      private videoappMidlet MIDlet;
      Button Videos,quotes;
      Form quote;
      Thread thread;
      public Quotes(videoappMidlet MIDlet){
        this.MIDlet = MIDlet;
      }

      public void run(){
      try{
        quote=new Form();
        Videos=new Button("Videos");
        ........

        quote.addComponent(Videos);
        ........

        Videos.addActionListener(this);
        ........

        quote.show();
       }catch(Exception error){
        System.err.println(error.toString());
       }
      }

      public void start(){
       thread = new Thread(this);
       try{ thread.start();}
       catch(Exception error){}
      }

      public void actionPerformed(ActionEvent ae) {
          if(ae.getSource()==Videos)
          {
             VideoPlayer vp = new VideoPlayer(this.MIDlet);
             vp.start();
          }
      }
    }


    public class videoappMidlet extends MIDlet implements ActionListener{
        Button play,quote;
        Form home;
        public void startApp() {
            Display.init(this);
            home=new Form();

            play.addActionListener(this);
            quote.addActionListener(this);
            home.show();
        }
        public void actionPerformed(ActionEvent ae) {     
          if(ae.getSource()==play)
          {
            VideoPlayer vp = new VideoPlayer(this);
            vp.start();
          }
          if(ae.getSource()==quote)
          {
            Quotes tp = new Quotes(this);
            tp.start();
          }
        }
     }

Answer 1

通常，JavaME中的视频不保证正在播放的图层。 LWUIT尝试无缝地暂停视频播放器，例如用户界面上的对话框。

作为附注，LWUIT不是线程安全的，您不能使用单独的线程来访问UI，因为将在不同平台上破解。