处理屏幕方向?

加载页面时,首先以横向_模式加载,几秒钟后,方向更改为纵向_模式值

protected void onCreate(Bundle savedInstanceState)
{

    super.onCreate();

    setContentView(R.layout.layout);

    if(orientation.equals("true")) 
    {
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    }
    else
    {
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
    }
}