android中c++层binder简单例子

service

#include
#include
#include
#include
#include

using namespace android;

#ifdef LOG_TAG
#undef LOG_TAG
#endif
#define LOG_TAG "testService"


class MyService : public BBinder
{
public:
MyService()
{
mydescriptor = String16("media.hello");
n=0;
}
virtual ~MyService() {}

//This function is used when call Parcel::checkInterface(IBinder*)
virtual const String16& getInterfaceDescriptor() const
{
LOGE("this is enter ==========getInterfaceDescriptor");
return mydescriptor;

}

protected:
void  show()
{
LOGE("this is for test show!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
LOGE("this is for test show!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
LOGE("this is for test show!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
LOGE("this is for test show!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
LOGE("this is for test show!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
}
virtual status_t    onTransact( uint32_t code,
const Parcel& data,
Parcel* reply,
uint32_t flags = 0)
{
LOGD("enter MyService onTransact and the code is %d",code);
/*
if (data.checkInterface(this))
LOGD("checkInterface OK");
else
{
LOGW("checkInterface failed");
return BBinder::onTransact(code, data, reply, flags);
}
*/
switch (code)
{
case 1:
LOGD("MyService interface 1");
break;
case 2:
LOGD("MyService interface 2");
cb = data.readStrongBinder();
break;
case 3:
{
LOGD("MyService interface 3, exit");
//No unregister service routine?

//It should return to client first and then call exit in another place.
exit(0);
break;
}
case 4:
{//call cb
LOGD("MyService interface 4 before if================");
cb = data.readStrongBinder();
if (cb != NULL)
{
LOGD("MyService interface 4");
Parcel in, out;
in.writeInterfaceToken(String16("ghq.callback"));
in.writeInt32(n++);
in.writeString16(String16("This is a string."));
cb->transact(1, in, &out, 0);
show();
}
break;
}
default:
return BBinder::onTransact(code, data, reply, flags);
}
return 0;
}

private:
String16 mydescriptor;
sp cb;
int n;
};



int main()
{

sp sm = defaultServiceManager();

status_t ret;

//register MyService to ServiceManager
MyService* srv = new MyService();
ret = sm->addService(String16("media.hello"), srv);


LOGD("addservice media.hello return %d", ret);

//call binder thread pool to start
ProcessState::self()->startThreadPool();
IPCThreadState::self()->joinThreadPool(true);
return 0;
}

client

#include
#include
#include
#include
#include
#include

using namespace android;

#ifdef LOG_TAG
#undef LOG_TAG
#endif
#define LOG_TAG "testCallback"

class MySetupCallback : public BBinder
{
public:
MySetupCallback()
{
mydescriptor = String16("android.os.ISetupCallback");
}
virtual ~MySetupCallback() {}

virtual const String16& getInterfaceDescriptor() const
{
return mydescriptor;
}

protected:
virtual status_t    onTransact( uint32_t code,
const Parcel& data,
Parcel* reply,
uint32_t flags = 0)
{
LOGD("enter MySetupCallback onTransact, code=%u", code);
if (data.checkInterface(this))
LOGD("checkInterface OK");
else
{
LOGW("checkInterface failed");
return -1;
}
switch (code)
{
default:
break;
}
return 0;
}

private:
String16 mydescriptor;
};

int main()
{
sp sm = defaultServiceManager();

sp b = sm->getService(String16("media.hello")); //Context.MCU_SERVICE

if (b == NULL)
{
LOGW("Can't find binder service \"media.hello\"");
return -1;
}

Parcel in1,out1;
MySetupCallback *cb = new MySetupCallback();
in1.writeStrongBinder(sp(cb));
int ret = b->transact(4, in1, &out1, 0);  //TRANSACTION_registerSetup = 4
LOGD("transact(4) return %d", ret);

ProcessState::self()->startThreadPool();
IPCThreadState::self()->joinThreadPool();

return 0;
}

Android.mk

# Copyright 2006 The Android Open Source Project

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

LOCAL_MODULE_TAGS := eng

LOCAL_SRC_FILES:= \
       testCallback.cpp

LOCAL_C_INCLUDES += \
        $(LOCAL_PATH) \
        $(LOCAL_PATH)/../include \
        $(LOCAL_PATH)/../include/callback \


LOCAL_SHARED_LIBRARIES := \
    libcutils \
    libbinder \
    libutils \
    libhardware

LOCAL_CFLAGS := -DRIL_SHLIB

LOCAL_MODULE:= testCallback

include $(BUILD_EXECUTABLE)

include $(CLEAR_VARS)

LOCAL_MODULE_TAGS := eng

LOCAL_SRC_FILES:= \
           testService.cpp

LOCAL_C_INCLUDES += \
        $(LOCAL_PATH) \
        $(LOCAL_PATH)/../include \
        $(LOCAL_PATH)/../include/callback \


LOCAL_SHARED_LIBRARIES := \
    libcutils \
    libbinder \
    libutils \
    libhardware

LOCAL_CFLAGS := -DRIL_SHLIB

LOCAL_MODULE:= testService

include $(BUILD_EXECUTABLE)