注意两点：
1.不要将android-support-v4包放在Android Private Libraries目录下。应将其放在lib目录中。
2.确认已将android-support-v4包添加到build path中。
3.配置好后重启eclipse。
如关联时提示如下信息：
The jar of this class file belongs to container 'Android Private Libraries' which does not allow modifications to source attachments on its entries.
需remove Android Private Libraries，如图：
