一、在AndroidManifest.xml里声明Activity(每个)的时候加上一个属性：
android:screenOrientation，属性取值landscape为固定横屏、portrait为固定纵屏幕、unspecified为未指明方向。
二、代码设置横屏竖屏
@Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);// 横屏 //setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); //竖屏 setContentView(R.layout.main); } 另： //去标题 public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.requestWindowFeature(Window.FEATURE_NO_TITLE); } //全屏 public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); } //屏幕常亮 view.setKeepScreenOn(true)