How to integrate/install latest c++ protobuf (3.2) with Android NDK?

问题

The earlier protobuf version 3.0 was easily integrated. But there are issues with the latest version 3.2. It simply compiles & builds all the un-related Android .cc file components as well.
If we follow the path to latest branch in git for c++ proto & build it as per the steps, then it generates 15 MB .SO file, unlike earlier which was ~1-2 MB.

How to optimally integrate latest protobuf to Android?

回答1:

Using cross platform Android Standalone Tool chain and provided build script may result in larger size of Shared library file(.so), generated due to unwanted files included in build script.You can create your own Android.mk file which includes only required core part of the library. Generated library files can be used as pre built library in other Android projects. Please check bellow steps for second option of creating own script files.

Download latest Android Google Protobuf source from Git Source Repository.
Create New Android application project. Create directory by name jni inside application project.
Run following commands from the downloaded source directory.

./autogen.sh

./configure

Place downloaded source code inside jni directory.
Place bellow Android.mk and Application.mk file inside jni directory.

Android.mk

    LOCAL_PATH := $(call my-dir)
    include $(CLEAR_VARS)
    c_includes := $(LOCAL_PATH)
    LOCAL_MODULE := libprotobuf      

    LOCAL_SRC_FILES := \
    google/protobuf/arena.cc \
    google/protobuf/arenastring.cc \
    google/protobuf/extension_set.cc \
    google/protobuf/generated_message_util.cc \
    google/protobuf/io/coded_stream.cc \
    google/protobuf/io/zero_copy_stream.cc \
    google/protobuf/io/zero_copy_stream_impl_lite.cc \
    google/protobuf/message_lite.cc \
    google/protobuf/repeated_field.cc \
    google/protobuf/stubs/atomicops_internals_x86_gcc.cc \
    google/protobuf/stubs/atomicops_internals_x86_msvc.cc \
    google/protobuf/stubs/bytestream.cc \
    google/protobuf/stubs/common.cc \
    google/protobuf/stubs/int128.cc \
    google/protobuf/stubs/once.cc \
    google/protobuf/stubs/status.cc \
    google/protobuf/stubs/statusor.cc \
    google/protobuf/stubs/stringpiece.cc \
    google/protobuf/stubs/stringprintf.cc \
    google/protobuf/stubs/structurally_valid.cc \
    google/protobuf/stubs/strutil.cc \
    google/protobuf/stubs/time.cc \
    google/protobuf/wire_format_lite.cc \
    google/protobuf/any.cc \
    google/protobuf/any.pb.cc \
    google/protobuf/api.pb.cc \
    google/protobuf/compiler/importer.cc \
    google/protobuf/compiler/parser.cc \
    google/protobuf/descriptor.cc \
    google/protobuf/descriptor.pb.cc \
    google/protobuf/descriptor_database.cc \
    google/protobuf/duration.pb.cc \
    google/protobuf/dynamic_message.cc \
    google/protobuf/empty.pb.cc \
    google/protobuf/extension_set_heavy.cc \
    google/protobuf/field_mask.pb.cc \
    google/protobuf/generated_message_reflection.cc \
    google/protobuf/io/gzip_stream.cc \
    google/protobuf/io/printer.cc \
    google/protobuf/io/strtod.cc \
    google/protobuf/io/tokenizer.cc \
    google/protobuf/io/zero_copy_stream_impl.cc \
    google/protobuf/map_field.cc \
    google/protobuf/message.cc \
    google/protobuf/reflection_ops.cc \
    google/protobuf/service.cc \
    google/protobuf/source_context.pb.cc \
    google/protobuf/struct.pb.cc \
    google/protobuf/stubs/mathlimits.cc \
    google/protobuf/stubs/substitute.cc \
    google/protobuf/text_format.cc \
    google/protobuf/timestamp.pb.cc \
    google/protobuf/type.pb.cc \
    google/protobuf/unknown_field_set.cc \
    google/protobuf/util/field_comparator.cc \
    google/protobuf/util/field_mask_util.cc \
    google/protobuf/util/internal/datapiece.cc \
    google/protobuf/util/internal/default_value_objectwriter.cc \
    google/protobuf/util/internal/error_listener.cc \
    google/protobuf/util/internal/field_mask_utility.cc \
    google/protobuf/util/internal/json_escaping.cc \
    google/protobuf/util/internal/json_objectwriter.cc \
    google/protobuf/util/internal/json_stream_parser.cc \
    google/protobuf/util/internal/object_writer.cc \
    google/protobuf/util/internal/proto_writer.cc \
    google/protobuf/util/internal/protostream_objectsource.cc \
    google/protobuf/util/internal/protostream_objectwriter.cc \
    google/protobuf/util/internal/type_info.cc \
    google/protobuf/util/internal/type_info_test_helper.cc \
    google/protobuf/util/internal/utility.cc \
    google/protobuf/util/json_util.cc \
    google/protobuf/util/message_differencer.cc \
    google/protobuf/util/time_util.cc \
    google/protobuf/util/type_resolver_util.cc \
    google/protobuf/wire_format.cc \
    google/protobuf/wrappers.pb.cc \
    google/protobuf/compiler/code_generator.cc      \
    google/protobuf/compiler/command_line_interface.cc      \
    google/protobuf/compiler/cpp/cpp_enum.cc      \
    google/protobuf/compiler/cpp/cpp_enum_field.cc      \
    google/protobuf/compiler/cpp/cpp_extension.cc      \
    google/protobuf/compiler/cpp/cpp_field.cc      \
    google/protobuf/compiler/cpp/cpp_file.cc      \
    google/protobuf/compiler/cpp/cpp_generator.cc      \
    google/protobuf/compiler/cpp/cpp_helpers.cc      \
    google/protobuf/compiler/cpp/cpp_map_field.cc      \
    google/protobuf/compiler/cpp/cpp_message.cc      \
    google/protobuf/compiler/cpp/cpp_message_field.cc      \
    google/protobuf/compiler/cpp/cpp_primitive_field.cc      \
    google/protobuf/compiler/cpp/cpp_service.cc      \
    google/protobuf/compiler/cpp/cpp_string_field.cc      \
    google/protobuf/compiler/plugin.cc      \
    google/protobuf/compiler/plugin.pb.cc      \
    google/protobuf/compiler/python/python_generator.cc      \
    google/protobuf/compiler/ruby/ruby_generator.cc      \
    google/protobuf/compiler/subprocess.cc      \
    google/protobuf/compiler/zip_writer.cc      \


    LOCAL_CFLAGS := -D GOOGLE_PROTOBUF_NO_RTTI=1
    LOCAL_CPPFLAGS := -std=c++11
    LOCAL_C_INCLUDES = $(LOCAL_PATH)/android 
    LOCAL_C_INCLUDES += ${ANDROID_NDK}/sources/cxx-stl/gnu-        libstdc++/4.8/include
    LOCAL_LDLIBS += -lz
    LOCAL_EXPORT_LDLIBS += -lz
    LOCAL_EXPORT_CFLAGS := $(LOCAL_CFLAGS)
    LOCAL_EXPORT_CPPFLAGS := $(LOCAL_CPPFLAGS)
    LOCAL_EXPORT_C_INCLUDES := $(LOCAL_C_INCLUDES)


    include $(BUILD_SHARED_LIBRARY)

Application.mk

APP_STL :=gnustl_shared # gnustl_static
NDK_TOOLCHAIN_VERSION := 4.9
APP_ABI := all
LIBCXX_FORCE_REBUILD := true
APP_PLATFORM:=android-9
NDK_DEBUG:=1

Run ndk-build and required .so files will be generated inside libs folder of the project directory.

来源：https://stackoverflow.com/questions/42458739/how-to-integrate-install-latest-c-protobuf-3-2-with-android-ndk

标签

android

c++

compilation

cross-compiling

protobuf-c