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);
}

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,