android 螢幕旋轉180度

http://www.cnblogs.com/zhangdadi/archive/2012/10/29/2744603.html

//橫屏正方向

if(getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE)

{

　　setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE);

}

//橫屏反方向

else if (getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE)

{

　　setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

}

//縱屏正方向

else if(getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_PORTRAIT)

{

　　setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT);

}

//縱屏反方向

else if (getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT)

{

　　setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

}

ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED,  

       ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE,  

       ActivityInfo.SCREEN_ORIENTATION_PORTRAIT,  

       ActivityInfo.SCREEN_ORIENTATION_USER,  

       ActivityInfo.SCREEN_ORIENTATION_BEHIND,  

       ActivityInfo.SCREEN_ORIENTATION_SENSOR,  

       ActivityInfo.SCREEN_ORIENTATION_NOSENSOR,  

       ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE,  

       ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT,  

       ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE,  

       ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT,  

       ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR,