[移动开发]动态加载菜单到preference

<activity
+??????????? android:name=".Settings$LActivity"? ---LActivity必须添加到Settings中集成SettingsActivity

+??????????? <meta-data android:name="com.android.settings.FRAGMENT_CLASS"
+??????????????? android:value="com.android.settings.display.HorizontalAppSettings" /> --必须在settingsGateway中添加HorizontalAppSettings.class.getName()

+??????????? <meta-data
+??????????????? android:name="com.android.settings.order"? --自动添加菜单，存在首次进入未添成功问题。
+??????????????? android:value="-165" />