Question

我正在开发一个BlackBerry应用程序，它在应用程序启动时需要启动画面。我没有找到任何实现启动画面的例子。

我在应用程序的启动类中使用了一个计时器来显示启动图像。有没有其他办法解决这个问题？

Answer 1

要为BlackBerry智能手机应用程序创建启动画面，必须扩展MainScreen类，需要使用键和导航事件，并且可以使用计时器在一定时间后关闭屏幕。


public class SplashScreen extends MainScreen {
   private MainScreen next;
   private UiApplication application;
   private Timer timer = new Timer();
   private static final Bitmap _bitmap = Bitmap.getBitmapResource("image.png");
   public SplashScreen(UiApplication ui, MainScreen next) {
      super(Field.USE_ALL_HEIGHT | Field.FIELD_LEFT);
      this.application = ui;
      this.next = next;
      this.add(new BitmapField(_bitmap));
      SplashScreenListener listener = new SplashScreenListener(this);
      this.addKeyListener(listener);
      timer.schedule(new CountDown(), 5000);
      application.pushScreen(this);
   }
   public void dismiss() {
      timer.cancel();
      application.popScreen(this);
      application.pushScreen(next);
   }
   private class CountDown extends TimerTask {
      public void run() {
         DismissThread dThread = new DismissThread();
         application.invokeLater(dThread);
      }
   }
   private class DismissThread implements Runnable {
      public void run() {
         dismiss();
      }
   }
   protected boolean navigationClick(int status, int time) {
      dismiss();
      return true;
   }
   protected boolean navigationUnclick(int status, int time) {
      return false;
   }
   protected boolean navigationMovement(int dx, int dy, int status, int time) {
      return false;
   }
   public static class SplashScreenListener implements
      KeyListener {
      private SplashScreen screen;
      public boolean keyChar(char key, int status, int time) {
         //intercept the ESC and MENU key - exit the splash screen
         boolean retval = false;
         switch (key) {
            case Characters.CONTROL_MENU:
            case Characters.ESCAPE:
            screen.dismiss();
            retval = true;
            break;
         }
         return retval;
      }
      public boolean keyDown(int keycode, int time) {
         return false;
      }
      public boolean keyRepeat(int keycode, int time) {
         return false;
      }
      public boolean keyStatus(int keycode, int time) {
         return false;
      }
      public boolean keyUp(int keycode, int time) {
         return false;
      }
      public SplashScreenListener(SplashScreen splash) {
         screen = splash;
      }
   }
}

BlackBerry应用程序中的启动画面

1 个答案: