android 屏幕旋转180度

//横屏正方向

if(getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE)
{

　　setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE);
}
//横屏反方向
else if (getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE)
{

　　setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
}

//纵屏正方向

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

　　setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT);
}
//纵屏反方向
else if (getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT)
{

　　setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}

1. ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED,  
2.        ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE,  
3.        ActivityInfo.SCREEN_ORIENTATION_PORTRAIT,  
4.        ActivityInfo.SCREEN_ORIENTATION_USER,  
5.        ActivityInfo.SCREEN_ORIENTATION_BEHIND,  
6.        ActivityInfo.SCREEN_ORIENTATION_SENSOR,  
7.        ActivityInfo.SCREEN_ORIENTATION_NOSENSOR,  
8.        ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE,  
9.        ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT,  
10.        ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE,  
11.        ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT,  
12.        ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR,