处理在Android中旋转的活动

我需要为我的活动的纵向和横向方向应用不同的布局.此外,如果方向是肖像,我需要显示警报.

我在@L_992_1@manifest中指定了android：configChanges =“Orientation | keyboardHidden”.我也像这样重写onConfigurationChanged方法：

@Override
public void onConfigurationChanged(Configuration newConfig)
{
    Log.d("tag","config changed");
    super.onConfigurationChanged(newConfig);

    int orientation = newConfig.orientation;
    if (orientation == Configuration.oRIENTATION_PORTraiT)
        Log.d("tag","PorTrait");
    else if (orientation == Configuration.oRIENTATION_LANDSCAPE)
        Log.d("tag","Landscape");
    else
        Log.w("tag","other: " + orientation);

    ....
}

从横向旋转到纵向日志时看起来像：

config changed
PorTrait

但是,当从纵向变为风景时,它看起来像

config changed
PorTrait
config changed
Landscape

为什么onConfigurationChanged被调用两次？我怎么能避免呢？