Android平台下NDK编译protocolbuff例子

先说下我的工程目录

ProjectName\

src\

core\

share\

proj.android\

jni\

…

sdk\

protobuf-2.4.1\

src\

…

从Google code下载protobuf-2.4.1源码包, 解压, 在protobuf-2.4.1目录下添加Android.mk, 内容如下

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE := protobuf-2.4.1

LOCAL_SRC_FILES := \

src/google/protobuf/io/coded_stream.cc                \

src/google/protobuf/io/printer.cc                     \

src/google/protobuf/io/gzip_stream.cc                 \

src/google/protobuf/io/tokenizer.cc                   \

src/google/protobuf/io/zero_copy_stream.cc            \

src/google/protobuf/io/zero_copy_stream_impl.cc       \

src/google/protobuf/io/zero_copy_stream_impl_lite.cc  \

src/google/protobuf/stubs/common.cc                   \

src/google/protobuf/stubs/once.cc                     \

src/google/protobuf/stubs/structurally_valid.cc       \

src/google/protobuf/stubs/strutil.cc                  \

src/google/protobuf/stubs/substitute.cc               \

src/google/protobuf/compiler/importer.cc              \

src/google/protobuf/compiler/parser.cc                \

src/google/protobuf/descriptor.cc                     \

src/google/protobuf/descriptor.pb.cc                  \

src/google/protobuf/descriptor_database.cc            \

src/google/protobuf/dynamic_message.cc                \

src/google/protobuf/extension_set.cc                  \

src/google/protobuf/extension_set_heavy.cc            \

src/google/protobuf/generated_message_reflection.cc   \

src/google/protobuf/generated_message_util.cc         \

src/google/protobuf/message.cc                        \

src/google/protobuf/message_lite.cc                   \

src/google/protobuf/reflection_ops.cc                 \

src/google/protobuf/repeated_field.cc                 \

src/google/protobuf/service.cc                        \

src/google/protobuf/text_format.cc                    \

src/google/protobuf/unknown_field_set.cc              \

src/google/protobuf/wire_format.cc                    \

src/google/protobuf/wire_format_lite.cc               \

LOCAL_C_INCLUDES := $(LOCAL_PATH) \

                    $(LOCAL_PATH)/src

include $(BUILD_STATIC_LIBRARY)

此时编译会报config.h找不到的错误, 这个文件在vsproject目录有, 但只是VC编译使用, 这篇文章说需要手动创建, 但实际上, Linux下可以通过config系统自动生成的, 但是Android平台下,不使用cygwin时, 就需要自己手动创建config.h, 内容如下

/*

    This make file is only for android ONLY, modified by Davy Xu June 17, 2013

    Cause android platform can't use linux config system when cygwin envirement is not available

*/

/* the location of <hash_set> */

#define HASH_SET_H <ext/hash_set>

#define HASH_MAP_H <ext/hash_map>

#define HASH_NAMESPACE __gnu_cxx

/* define if the compiler has hash_map */

//#define HAVE_HASH_MAP 1

/* define if the compiler has hash_set */

//#define HAVE_HASH_SET 1

#define HAVE_PTHREAD

剩下的事情就简单了, 在你的工程Android.mk里添加protobuf的引用

例如:

LOCAL_WHOLE_STATIC_LIBRARIES += protobuf-2.4.1

$(call import-module,protobuf-2.4.1)

还要在NDK_MODULE_PATH中增加搜索路径D:\Develop\ProjectName\sdk\

注意, 这里protobuf-2.4.1名称必须与sdk下的文件夹名, LOCAL_MODULE中的名称保持一致, 否则搜索不到