Android Binder机制的Native应用

mkdir testbinder //创建testbinder目录

Android.mk

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include $(call all-subdir-makefiles)

一、接口类

mkdir interface //创建interface目录，存放接口类

Itestbinder.h

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#include <binder/IInterface.h>
namespace android{
class Itestbinder : public IInterface{
public:
DECLARE_META_INTERFACE(testbinder);
virtual int testinterface(int a) = 0;
};
/
class Bntestbinder : public BnInterface<Itestbinder>{
public:
virtual status_t onTransact( uint32_t code,
const Parcel& data,
Parcel* reply,
uint32_t flags = 0);
};
}

Itestbinder.cpp

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#include "Itestbinder.h"
#include <binder/Parcel.h>
#include <binder/IInterface.h>
namespace android{
enum {
TEST_INTERFACE,
};
//客户端
class Bptestbinder : public BpInterface<Itestbinder>{
public:
Bptestbinder(const sp<IBinder>& impl) : BpInterface<Itestbinder>(impl){
}
virtual int testinterface(int a){
LOGD("TK---->>>>>>Itestbinder.cpp>>>>Bptestbinder::testinterface\n");
Parcel data,reply;
data.writeInt32(a);
remote()->transact(TEST_INTERFACE,data,&reply);
return reply.readInt32();
}
};
IMPLEMENT_META_INTERFACE(testbinder, "android.test.Itestbinder");
/服务端
status_t Bntestbinder::onTransact(
uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags){
LOGD("TK---->>>>>>Itestbinder.cpp>>>>Bntestbinder::onTransact\n");
switch (code) {
case TEST_INTERFACE:{
//CHECK_INTERFACE(Itestbinder, data, reply);
LOGD("TK---->>>>>>Itestbinder.cpp>>>>Bntestbinder::onTransact>>111\n");
reply->writeInt32(testinterface((int) data.readInt32()) );
return NO_ERROR;
} break;
default:{
LOGD("TK---->>>>>>Itestbinder.cpp>>>>Bntestbinder::onTransact>>222\n");
return BBinder::onTransact(code, data, reply, flags);
}
}
}
}

二、客户端实现

mkdir client //创建client目录，这个是client的实现

client.h

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#include "../interface/Itestbinder.h"
namespace android{
class client{
public:
static const sp<Itestbinder>& get_test_binder();
static sp<Itestbinder> gtestbinder;
};
}

client.cpp

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#include "client.h"
#include <binder/IServiceManager.h>
#include <utils/Log.h>
#include <stdio.h>
namespace android{
sp<Itestbinder> client::gtestbinder;
const sp<Itestbinder>& client::get_test_binder(){
if (gtestbinder == 0) {
sp<IServiceManager> sm = defaultServiceManager();
sp<IBinder> binder;
do {
binder = sm->getService(String16("test.Itestbinder"));
if (binder != 0)
break;
printf("testbinder not published, waiting...");
usleep(500000); // 0.5 s
} while (true);
gtestbinder = interface_cast<Itestbinder>(binder);
}
if(gtestbinder==0) printf("no testbinder!?");
return gtestbinder;
}
}

main.cpp

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#include <stdio.h>
#include "client.h"
using namespace android;
int main(int argc, char* argv[]){
client* myclient = new client();
if(myclient == NULL) return 0;
const sp<Itestbinder>& tb = myclient->get_test_binder();
if(tb == NULL) return 0;
int a = tb->testinterface(3);
LOGD("TK-------->>>result is %d\n",a);
delete myclient;
return 0;
}

Android.mk

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LOCAL_PATH:= $(call my-dir)
#LOCAL_CFLAGS_ALL :=-I. -I$(LOCAL_PATH)/..
include $(CLEAR_VARS)
LOCAL_SRC_FILES:= \
client.cpp \
main.cpp \
../interface/Itestbinder.cpp
LOCAL_SHARED_LIBRARIES := \
libui libcutils libutils libbinder libsonivox libicuuc libexpat \
libdl
LOCAL_MODULE:= client
LOCAL_MODULE_TAGS := optional
include $(BUILD_EXECUTABLE)

三、服务端

mkdir server //创建server目录，这个是服务端实现

testbinder.h

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#include "../interface/Itestbinder.h"
#include <binder/BinderService.h>
namespace android{
class testbinder:
public BinderService<testbinder>,
public Bntestbinder{
friend class BinderService<testbinder>;
public:
static const char* getServiceName() { return "test.Itestbinder"; }
virtual int testinterface(int a);
virtual status_t onTransact(
uint32_t code,
const Parcel& data,
Parcel* reply,
uint32_t flags);
};
}

testbinder.cpp

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#include <binder/IPCThreadState.h>
#include <binder/IServiceManager.h>
#include <utils/Log.h>
//#include <utils/Trace.h>
#include <binder/Parcel.h>
#include <binder/IPCThreadState.h>
#include <utils/String16.h>
#include <utils/threads.h>
#include <utils/Atomic.h>
//#include <cutils/bitops.h>
#include <cutils/properties.h>
#include <cutils/compiler.h>
#include "testbinder.h"
namespace android{
int testbinder::testinterface(int a){
LOGD("TK---->>>>>>testbinder.cpp>>>>testbinder::testinterface\n");
return a+2;
}
status_t testbinder::onTransact(
uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags){
LOGD("TK---->>>>>>testbinder.cpp>>>>testbinder::onTransact\n");
return Bntestbinder::onTransact(code, data, reply, flags);
}
}

main.cpp

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#include <binder/IPCThreadState.h>
#include <binder/ProcessState.h>
#include <binder/IServiceManager.h>
#include <utils/Log.h>
#include "testbinder.h"
using namespace android;
int main(int argc, char** argv)
{
sp<ProcessState> proc(ProcessState::self());
sp<IServiceManager> sm = defaultServiceManager();
LOGI("ServiceManager: %p", sm.get());
testbinder::instantiate();
ProcessState::self()->startThreadPool();
IPCThreadState::self()->joinThreadPool();
return 0;
}

Android.mk

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LOCAL_PATH:= $(call my-dir)
#LOCAL_CFLAGS_ALL :=-I. -I$(LOCAL_PATH)/..
include $(CLEAR_VARS)
LOCAL_SRC_FILES:= \
main.cpp \
testbinder.cpp \
../interface/Itestbinder.cpp
LOCAL_SHARED_LIBRARIES := \
libui libcutils libutils libbinder libsonivox libicuuc libexpat \
libdl
LOCAL_MODULE:= server
LOCAL_MODULE_TAGS := optional
include $(BUILD_EXECUTABLE)

四、运行

./server

./client

结果：

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result:
1.client
root@android:/data # ./client
TK---->>>>>>Itestbinder.cpp>>>>Bptestbinder::testinterface
TK-------->>>result is 4
2.server
root@android:/data # ./server
TK---->>>>>>testbinder.cpp>>>>testbinder::onTransact
TK---->>>>>>Itestbinder.cpp>>>>Bntestbinder::onTransact
TK---->>>>>>Itestbinder.cpp>>>>Bntestbinder::onTransact>>111
TK---->>>>>>testbinder.cpp>>>>testbinder::testinterface
=============================================================
I/ ( 624): ServiceManager: 0xc708
D/ ( 626): TK---->>>>>>Itestbinder.cpp>>>>Bptestbinder::testinterface
D/ ( 624): TK---->>>>>>testbinder.cpp>>>>testbinder::onTransact
D/ ( 624): TK---->>>>>>Itestbinder.cpp>>>>Bntestbinder::onTransact
D/ ( 624): TK---->>>>>>Itestbinder.cpp>>>>Bntestbinder::onTransact>>111
D/ ( 624): TK---->>>>>>testbinder.cpp>>>>testbinder::testinterface
D/ ( 626): TK-------->>>result is 5

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