整的错误提示信息为:No orientation specified, and the default is horizontal. This is a common source of bugs when children are added dynamically. 通常发生这个错误提示的原因是我们直接在原有的页面上把别的布局标签改成
原文链接: http://www.jiliuke.com/2014/10/27/no-orientation-specified-and-the-default-is-horizontal/
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