Android binder通信实例

server端代码：

#include <stdio.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/mman.h>

#include <utils/RefBase.h>
#include <binder/IInterface.h>
#include <binder/Parcel.h>
#include <utils/threads.h>

#include <cutils/log.h>
#include <cutils/properties.h>
#include <binder/IServiceManager.h>
#include <binder/IPCThreadState.h>

using namespace android;

namespace android
{

enum{
CALCULATE_MUL_NUM=0,
CALCULATE_DIV_NUM
};

class MyServer:public BBinder
{
public:
MyServer();
virtual ~MyServer();
static int instantiate();
virtual status_t onTransact(uint32_t, const Parcel&, Parcel*, uint32_t);

void parse_edid(void);
int DeviceInit(void);
void UpdateSurface(void);

private:
mutable Mutex mLock;
};

int MyServer::instantiate()
{
int tTempRet=defaultServiceManager()->addService(String16("service.damon"), new MyServer());

ALOGD("damon ===> server instantiate : %d \n", tTempRet);

return tTempRet;
}

MyServer::MyServer()
{
ALOGD("damon ===> create server !\n");
}

MyServer::~MyServer()
{
ALOGD("damon ===> destroy server !\n");
}

status_t MyServer::onTransact(uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
{
//  ALOGD("damon ===> server onTransact code = %d ", code);

Mutex::Autolock _l(mLock);
switch(code)
{
case CALCULATE_MUL_NUM:
{
int a=data.readInt32();
int b=data.readInt32();
int tTempSum=a*b;
ALOGD("damon ===> server mul = %d %d %d \n", a, b, tTempSum);
reply->writeInt32(tTempSum);
return NO_ERROR;
}
break;
case CALCULATE_DIV_NUM:
{
int a=data.readInt32();
int b=data.readInt32();
int tTempSum=a/b;
ALOGD("damon ===> server div = %d %d %d \n", a, b, tTempSum);
reply->writeInt32(tTempSum);
return NO_ERROR;
}
break;
case 0x10:
{

}
break;
default:
return BBinder::onTransact(code, data, reply, flags);
}

return 0;
}
}

int main(int argc, char *argv[])
{
srand(time(NULL));

sp<ProcessState> proc(ProcessState::self());
sp<IServiceManager> sm=defaultServiceManager();
ALOGD("damon ===> ServiceManager: %p", sm.get());
MyServer::instantiate();
ProcessState::self()->startThreadPool();
IPCThreadState::self()->joinThreadPool();

return 0;
}

Android.mk文件如下：

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_PRELINK_MODULE := false

LOCAL_CFLAGS += -O2 -g

LOCAL_SRC_FILES := server.cpp

LOCAL_SHARED_LIBRARIES = libdl libcutils libutils libbinder

LOCAL_C_INCLUDE := $(TOP)/frameworks/base/include

LOCAL_MODULE := server_test

LOCAL_MODULE_TAGS:= optional

LOCAL_CFLAGS += -Wno-unused-parameter -Werror

include $(BUILD_EXECUTABLE)

client端代码如下：

#include <cutils/log.h>
#include <cutils/properties.h>
#include <binder/IServiceManager.h>
#include <binder/IPCThreadState.h>

using namespace android;

enum{
CALCULATE_ADD_NUM=0,
CALCULATE_SUB_NUM
};

enum{
CALCULATE_MUL_NUM=0,
CALCULATE_DIV_NUM
};

int main(int argc, char *argv[])
{
sp<IBinder> tTempServerBinder;
Parcel data, reply;
int tTempSum=0;

ALOGD("damon ===> client main is call .....");

sp<IServiceManager> sm=defaultServiceManager();

while(1)
{
tTempServerBinder=sm->getService(String16("service.damon"));
ALOGD("damon ===> client get service : %p", sm.get());
if(tTempServerBinder==0)
{
ALOGD("damon ===> test service not published, waiting . . .");
usleep(1000*1000);
continue;
}else
{
ALOGD("damon ===> get service success! ");
break;
}
}

data.writeInt32(3);
data.writeInt32(5);
ALOGD("damon ===> create remote !\n");
tTempServerBinder->transact(CALCULATE_MUL_NUM, data, &reply);
tTempSum=reply.readInt32();
ALOGD("damon ===> client calculate mul num : %d ", tTempSum);

data.freeData();
data.writeInt32(5);
data.writeInt32(3);
tTempServerBinder->transact(CALCULATE_DIV_NUM, data, &reply);
tTempSum=reply.readInt32();
ALOGD("damon ===> client calculate div num : %d \n", tTempSum);

return 0;
}

Android.mk文件如下：

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_PRELINK_MODULE := false

LOCAL_CFLAGS += -O2 -g

LOCAL_SRC_FILES := client.cpp

LOCAL_SHARED_LIBRARIES = libdl libcutils libutils libbinder

LOCAL_C_INCLUDE := $(TOP)/frameworks/base/include

LOCAL_MODULE := client_test

LOCAL_MODULE_TAGS:= optional

LOCAL_CFLAGS += -Wno-unused-parameter -Werror

include $(BUILD_EXECUTABLE)