[Android] 動態改變螢幕方向

http://fecbob.pixnet.net/blog/post/35642233-android-%E5%8B%95%E6%85%8B%E6%9B%B4%E6%94%B9%E8%9E%A2%E5%B9%95%E6%96%B9%E5%90%91%E7%9A%84%E7%B0%A1%E5%96%AE%E4%BE%8B%E5%AD%90(landscape%E8%88%87