黑莓编程上的自动旋转

Question

我为 Blackberry Storm 编写代码。当我的应用程序处于水平显示（480x360）时，它可以工作。但是当黑莓倾斜到垂直（360x480）时，图片就会被切断。所以我想问如何设置以便在旋转时也调整图片大小？有什么方法可以检查黑莓手机是否再次水平或垂直显示？

谢谢。

Answer 1

这里有两件事，要么您将锁定屏幕方向，要么您将在应用程序中提供支持。

代码示例：检索屏幕方向

switch(Display.getOrientation()) 
{
   case Display.ORIENTATION_LANDSCAPE:
      Dialog.alert("Screen orientation is landscape"); break;
   case Display.ORIENTATION_PORTRAIT:
      Dialog.alert("Screen orientation is portrait"); break;
   case Display.ORIENTATION_SQUARE:
      Dialog.alert("Screen orientation is square"); break;
   default:
      Dialog.alert("Screen orientation is not known"); break;
}

代码示例：在 BlackBerry API 应用程序中强制纵向视图

// Use code like this before invoking UiApplication.pushScreen()
int direction = Display.DIRECTION_NORTH;
Ui.getUiEngineInstance().setAcceptableDirections(direction);

如果您想要在方向更改时处理图像和其他图形设置，那么您可以执行以下操作：更改您的代码后。

1. 在 MainScreen 子类中重写子布局方法。

   受保护的无效子布局（int arg0，int arg1）{
   // 做所有的事情
   super.sublayout(arg0, arg1);
   }

2. 检查方向变化，重新排列 UI。对于此类事情，建议使用相对布局。

希望，这可以帮助你。有关详细信息，请访问 Specifying_display_direction_of_screen

编辑： 覆盖 sublayout()然后编写特定于方向的代码

public void sublayout(int width, int height) {
    switch(Display.getOrientation()) 
        {
           case Display.ORIENTATION_LANDSCAPE:
              // write the piece of code for refreshing the screen UI which screen orientation is landscape
              break;
           case Display.ORIENTATION_PORTRAIT:
               // write the piece of code for refreshing the screen UI which screen orientation is portrait
               break;

        }
  super.sublayout(width, height);
}

编辑 2：

由于 UI 事件锁定，您会出错，现在您会这样做对您的代码进行以下更改。

public void sublayout(int maxWidth, int maxHeight) {
            int displayWidth = deviceWidth;
            int displayHeight = deviceHeight;

            switch (Display.getOrientation()) {
            case Display.ORIENTATION_LANDSCAPE:
                UiApplication.getUiApplication().invokeLater(new Runnable()
                {
                    public void run()
                    {
                        Dialog.alert("Screen orientation is landscape");
                        // here you need to change your uI code as you want to do in for landscape mode
                        // you may need to delete and add the UI comps manually
                        // if the components added to absolute layout then just refresh the screen it will auto adjust with your new screen size 
                    }
                });

                break;
            case Display.ORIENTATION_PORTRAIT:
                UiApplication.getUiApplication().invokeLater(new Runnable()
                {
                    public void run()
                    {
                        Dialog.alert("Screen orientation is PORTRAIT:");
                        // here you need to change your uI code as you want to do in for PORTRAIT mode
                        // you may need to delete and add the UI comps manually
                        // if the components added to absolute layout then just refresh the screen it will auto adjust with your new screen size 

                    }
                });
                break;
            }
            super.sublayout(displayWidth, displayHeight);
            setExtent(displayWidth, displayHeight);
        }

Answer 2

好吧，我之前遇到过这个问题并解决了。解决方案不是“强制黑莓屏幕不旋转”。我以前做过这个，这很烦人。解决这个问题的方法是重写主屏幕的 subLayout 方法以及主屏幕中包含的所有管理器。当发生旋转时总是调用此方法。

您的代码将如下所示：

public void sublayout(int width, int height) {
  changeImage(); // this method will change your image x and y and then draw it again
  super.sublayout(width, height);
}