android系统编译问题
这2天开始学android系统，今天改了下android的一些源码，然后编译时出现很多
frameworks/base/core/res/res/values/public.xml:885: error: Public symbol drawable/sym_call_missed declared here is not defined.
frameworks/base/core/res/res/values/public.xml:886: error: Public symbol drawable/sym_call_outgoing declared here is not defined.
frameworks/base/core/res/res/values/public.xml:888: error: Public symbol drawable/sym_contact_card declared here is not defined.
frameworks/base/core/res/res/values/public.xml:887: error: Public symbol drawable/sym_def_app_icon declared here is not defined.
frameworks/base/core/res/res/values/public.xml:889: error: Public symbol drawable/title_bar declared here is not defined.
frameworks/base/core/res/res/values/public.xml:1083: error: Public symbol drawable/title_bar_tall declared here is not defined.
不知道如何解决，求助大家
[解决办法]
先把android工程下的文件目录搞清楚是干什么的再改代码部分
[解决办法]
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