android:screenOrientation的说明

在Android的官方文档当中，对android:screenOrientation的说明如下：

 http://www.cnblogs.com/snowberg/archive/2012/07/15/2618908.html

android:screenOrientationThe orientation of the activity‘s display on the device.

The value can be any one of the following strings:

Note: When you declare one of the landscape or portrait values, it is considered a hard requirement for the orientation in which the activity runs. As such, the value you declare enables filtering by services such as Google Play so your application is available only to devices that support the orientation required by your activities. For example, if you declare either "landscape","reverseLandscape", or "sensorLandscape", then your application will be available only to devices that support landscape orientation. However, you should also explicitly declare that your application requires either portrait or landscape orientation with the <uses-feature> element. For example, <uses-feature android:name="android.hardware.screen.portrait"/>. This is purely a filtering behavior provided by Google Play (and other services that support it) and the platform itself does not control whether your app can be installed when a device supports only certain orientations.

译文为：

android:screenOrientation

Activity在屏幕当中显示的方向。属性值可以是下表中列出的一个值：

注意：在给这个属性设置的值是“landscape”或portrait的时候，要考虑硬件对Activity运行的方向要求。正因如此，这些声明的值能够被诸如Google Play这样的服务所过滤，以便应用程序只能适用于那些支持Activity所要求的方向的设备。例如，如果声明了“landscape”、“reverseLandscape”、或“sensorLandscape”，那么应用程序就只能适用于那些支持横向显示的设备。但是，还应该使用<uses-feature>元素来明确的声明应用程序所有的屏幕方向是纵向的还是横行的。例如：<uses-feature android:name=”android.hardware.screen.portrait”/>。这个设置由Google Play提供的纯粹的过滤行为，并且在设备仅支持某个特定的方向时，平台本身并不控制应用程序是否能够被按照。