判断当前屏幕的方向

@Override
protected void onCreate(Bundle savedInstanceState) {
　　super.onCreate(savedInstanceState);
　　int orientation = getResources().getConfiguration().orientation;
　　if (orientation == Configuration.ORIENTATION_LANDSCAPE) {// 横屏
　　} else if (orientation == Configuration.ORIENTATION_PORTRAIT) {// 竖屏
　　}
}