android下使用google test入门

最近在研究android下的C++单元测试，使用google test进行了摸索实践，在此分享一下如何修改makefile 编译生成android下可执行程序，并在android上执行查看结果，更深入的细节未曾涉及。

首先介绍一下我使用的开发环境，Linux Mint 14，android-ndk-r8d，android 2.3.6系统的三星GT9001手机。（后续操作均是在此开发环境下进行，大家需要根据自己的开发环境作一些调整）

下面依次对各步骤进行描述。

下载google test 1.6源码解压并修改Makefile

我的解压目录为/home/cfh/ndk/source/gtest，然后我将 gtest/make 目录下的Makefile进行了修改（该Makefile以google test 提供sample1为演示对象，建议先将原始的Makefile进行备份，以便后续参考！），修改的总体思路是将Makefile中默认的编译变量改为NDK对应的值(如将 CXX 设置为 arm-linux-androideabi-g++)，设置好编译选项，包括宏定义（定义ANDROID宏用于编译android使用的gtest）、搜索的头文件路径、系统头文件根路径(--sysroot设置)、链接的静态库。

最终的Makefile内容如下所示，我使用的NDK目录（ANDROID_NDK）为/home/cfh/ndk，大家需要根据自己系统的设置进行调整。

# A sample Makefile for building Google Test and using it in user# tests.  Please tweak it to suit your environment and project.  You# may want to move it to your project's root directory.## SYNOPSIS:##   make [all]  - makes everything.#   make TARGET - makes the given target.#   make clean  - removes all files generated by make.# Please tweak the following variable definitions as needed by your# project, except GTEST_HEADERS, which you can use in your own targets# but shouldn't modify.# Points to the root of Google Test, relative to where this file is.# Remember to tweak this if you move this file.GTEST_DIR := $(shell pwd)/..$(info $(GTEST_DIR))# Where to find user code.USER_DIR = $(GTEST_DIR)/samplesANDROID_NDK = /home/cfh/ndkANDROID_NDK_BIN_DIR = ${ANDROID_NDK}/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/binCC = $(ANDROID_NDK_BIN_DIR)/arm-linux-androideabi-gccCXX = $(ANDROID_NDK_BIN_DIR)/arm-linux-androideabi-g++# Flags passed to the preprocessor.CPPFLAGS += -DANDROID \            -I$(GTEST_DIR)/include \            -I$(ANDROID_NDK)/sources/cxx-stl/gnu-libstdc++/4.6/include \            -I$(ANDROID_NDK)/sources/cxx-stl/gnu-libstdc++/4.6/libs/armeabi/include \            --sysroot=$(ANDROID_NDK)/platforms/android-14/arch-armNDK_LD_PATH = $(ANDROID_NDK)/sources/cxx-stl/gnu-libstdc++/4.6/libs/armeabiLDFLAGS = $(NDK_LD_PATH)/libgnustl_static.a \          $(NDK_LD_PATH)/libsupc++.a# Flags passed to the C++ compiler. (backup: -fexceptions -frtti)CXXFLAGS += -g -Wall -Wextra# All tests produced by this Makefile.  Remember to add new tests you# created to the list.TESTS = sample1_unittest# All Google Test headers.  Usually you shouldn't change this# definition.GTEST_HEADERS = $(GTEST_DIR)/include/gtest/*.h \                $(GTEST_DIR)/include/gtest/internal/*.h# House-keeping build targets..PHONY : all cleanall : $(TESTS)clean :rm -f $(TESTS) gtest.a gtest_main.a *.o# Builds gtest.a and gtest_main.a.# Usually you shouldn't tweak such internal variables, indicated by a# trailing _.GTEST_SRCS_ = $(GTEST_DIR)/src/*.cc $(GTEST_DIR)/src/*.h $(GTEST_HEADERS)# For simplicity and to avoid depending on Google Test's# implementation details, the dependencies specified below are# conservative and not optimized.  This is fine as Google Test# compiles fast and for ordinary users its source rarely changes.gtest-all.o : $(GTEST_SRCS_)$(CXX) $(CPPFLAGS) -I$(GTEST_DIR) $(CXXFLAGS) -c \            $(GTEST_DIR)/src/gtest-all.ccgtest_main.o : $(GTEST_SRCS_)$(CXX) $(CPPFLAGS) -I$(GTEST_DIR) $(CXXFLAGS) -c \            $(GTEST_DIR)/src/gtest_main.ccgtest.a : gtest-all.o$(AR) $(ARFLAGS) $@ $^gtest_main.a : gtest-all.o gtest_main.o$(AR) $(ARFLAGS) $@ $^# Builds a sample test.  A test should link with either gtest.a or# gtest_main.a, depending on whether it defines its own main()# function.sample1.o : $(USER_DIR)/sample1.cc $(USER_DIR)/sample1.h $(GTEST_HEADERS)$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c $(USER_DIR)/sample1.ccsample1_unittest.o : $(USER_DIR)/sample1_unittest.cc \                     $(USER_DIR)/sample1.h $(GTEST_HEADERS)$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c $(USER_DIR)/sample1_unittest.ccsample1_unittest : sample1.o sample1_unittest.o gtest_main.a$(CXX) $(CPPFLAGS) $(CXXFLAGS) $^ $(LDFLAGS) -o $@

进入 gtest/make 所在目录运行make进行编译链接

cfh@cfh ~/ndk/sources/gtest/make $ make

将编译生成的可执行文件push到设备或模拟器上

可执行文件放到android设备或模拟器的 /data/local 目录下是可以通过adb shell 正常运行的，其它目录则可能存在问题，如/sdcard。

cfh@cfh ~/ndk/sources/gtest/make $ adb push ./sample1_unittest /data/local

使用adb shell执行目标程序

cfh@cfh ~/ndk/sources/gtest/make $ adb shell
# cd /data/local
# ./sample1_unittest

执行结果如下

Running main() from gtest_main.cc
[==========] Running 6 tests from 2 test cases.
[----------] Global test environment set-up.
[----------] 3 tests from FactorialTest
[ RUN      ] FactorialTest.Negative
[       OK ] FactorialTest.Negative (2 ms)
[ RUN      ] FactorialTest.Zero
[       OK ] FactorialTest.Zero (0 ms)
[ RUN      ] FactorialTest.Positive
[       OK ] FactorialTest.Positive (0 ms)
[----------] 3 tests from FactorialTest (6 ms total)

[----------] 3 tests from IsPrimeTest
[ RUN      ] IsPrimeTest.Negative
[       OK ] IsPrimeTest.Negative (0 ms)
[ RUN      ] IsPrimeTest.Trivial
[       OK ] IsPrimeTest.Trivial (0 ms)
[ RUN      ] IsPrimeTest.Positive
[       OK ] IsPrimeTest.Positive (0 ms)
[----------] 3 tests from IsPrimeTest (1 ms total)

[----------] Global test environment tear-down
[==========] 6 tests from 2 test cases ran. (14 ms total)
[ PASSED ] 6 tests.

至此，在android下使用google test全流程走通，其它高级或复杂的需求可以在此基础上继续实现。

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