Android.mk中LOCAL_EXPORT_C_INCLUDES的作用
NDK中的说明是这样说明的：
III. Exporting headers for prebuilt libraries:
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The example above was called ‘naive’ because, in practice, the code in
foo-user.c is going to depend on specific declarations that are normally
found in a header file distributed with the prebuilt library (e.g. “foo.h”).
In other words, foo-user.c is going to have a line like:
#include
And you need to provide the header and its include path to the compiler
when building the foo-user module.
A simple way to deal with that is to use exports in the prebuilt module
definition. For example, assuming that a file “foo.h” is located under
the ‘include’ directory relative to the prebuilt module, we can write:
include $(CLEAR_VARS)
LOCAL_MODULE