android ndk编译getevent

我从android的源码中提取了getevent.c getevent.h放在一个目录下, 进行jni编译测试

加了个Android.mkcctv5在线直播内容如下

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE := GetEvent

LOCAL_SRC_FILES := getevent.c

include $(BUILD_SHARED_LIBRARY)

进入源码目录，手动编译：

ndk-build V=1 2>&1 | tee log.txt

查看log.txt

编译会出现一大堆错误：

/opt/android-ndk-r10d/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc -MMD -MP -MF ./obj/local/armeabi/objs/GetEvent/getevent.o.d -fpic -ffunction-sections -funwind-tables -fstack-protector -no-canonical-prefixes -march=armv5te -mtune=xscale -msoft-float -mthumb -Os -g -DNDEBUG -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 -Ijni -DANDROID -Wa,--noexecstack -Wformat -I/opt/android-ndk-r10d/platforms/android-3/arch-arm/usr/include -c jni/getevent.c -o ./obj/local/armeabi/objs/GetEvent/getevent.o

In file included from jni/getevent.c:14:0:

jni/getevent.h:12:15: error: 'INPUT_PROP_POINTER' undeclared here (not in a function)

LABEL(INPUT_PROP_POINTER),

jni/getevent.h:8:38: note: in definition of macro 'LABEL'

#define LABEL(constant) { #constant, constant }

jni/getevent.h:13:15: error: 'INPUT_PROP_DIRECT' undeclared here (not in a function)

LABEL(INPUT_PROP_DIRECT),

jni/getevent.h:8:38: note: in definition of macro 'LABEL'

#define LABEL(constant) { #constant, constant }

jni/getevent.h:14:15: error: 'INPUT_PROP_BUTTONPAD' undeclared here (not in a function)

LABEL(INPUT_PROP_BUTTONPAD),

jni/getevent.h:8:38: note: in definition of macro 'LABEL'

#define LABEL(constant) { #constant, constant }

.................................

我用helper2416平台的交叉编译器单独编译getevent.c没有错误，所以问题肯定处在android的编译器上。

仔细查了下发现

/opt/android-ndk-r10d/platforms/android-3 目录下根本没有linux/input.h315直播头文件(getevent.h中需要这个文件头)

反而在/opt/android-ndk-r10d/platforms/android-21下有，所以想来是-I的目录错了。

手动执行编译命令：

/opt/android-ndk-r10d/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc -MMD -MP -MF ./obj/local/armeabi/objs/GetEvent/getevent.o.d -fpic -ffunction-sections -funwind-tables -fstack-protector -no-canonical-prefixes -march=armv5te -mtune=xscale -msoft-float -mthumb -Os -g -DNDEBUG -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 -Ijni -DANDROID -Wa,--noexecstack -Wformat -I/opt/android-ndk-r10d/platforms/android-21/arch-arm/usr/include -c jni/getevent.c -o ./obj/local/armeabi/objs/GetEvent/getevent.o

编译成功,证实了自己的看法。

解决方法：

源码目录中加上Application.mk文件

内容为

APP_PLATFORM := android-21

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