横竖屏幕切换

//在AndroidManifest.xml中的activity中

 <activity               android:screenOrientation="landscape"            android:configChanges="orientation|keyboardHidden"            android:name=".MainActivity"            android:label="@string/title_activity_main" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>