Activity横屏显示,属性详解

<activity android:name=".MainActivity"
    android:configChanges="orientation|keyboardHidden|screenSize"
    android:screenOrientation="sensorLandscape">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />

        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>

    最关键的就是这两行

android:configChanges="orientation|keyboardHidden|screenSize"  android:screenOrientation="sensorLandscape"

这两行代码的意思

http://blog.youkuaiyun.com/xiabing082/article/details/41867463

https://www.cnblogs.com/weixing/archive/2013/09/09/3309702.html