在android版本13以前，实现底部菜单常用的手法是使用TabActivity+TabHost ，但在13版本中TabActivity已经被舍弃。 以下为官方原文： This class was deprecated in API level 13. New applications should use Fragments instead of this class; to continue to run on older devices, you can use the v4 support library which provides a version of the Fragment API that is compatible down to DONUT.
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