android binder - 客户端(java层) 调用 服务端(c++层) 例子

客户端是Android程序和服务端采用C++程序编写

客户端新建一个Android程序，在包名 com.example.client3下有文件，如下

MainActivity.java

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package com.example.client3;

import android.app.Activity;

import android.os.Bundle;

import android.os.IBinder;

import android.os.Parcel;

import android.os.RemoteException;

import android.os.ServiceManager;

import android.util.Log;

public class MainActivity extends Activity {

     private static final String TAG = MainActivity.class.getSimpleName();

     private static final java.lang.String DESCRIPTOR = "sample.hello";

     private static final int FUNC_CALLFUNCTION = 1;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

          super.onCreate(savedInstanceState);

          Log.i(TAG, "Client oncreate ");

          Parcel _data = Parcel.obtain();

          Parcel _reply = Parcel.obtain();

          IBinder b = ServiceManager.getService(DESCRIPTOR);

           try {

              _data.writeInterfaceToken(DESCRIPTOR);

              b.transact(FUNC_CALLFUNCTION, _data, _reply, 0);

              _reply.readException();

              _reply.readInt();

          } catch (RemoteException e) {

               // TODO Auto-generated catch block

              e.printStackTrace();

          } finally {

              _reply.recycle();

              _data.recycle();

          }

     }

}

sampleService.cpp

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#include <binder/IServiceManager.h>

#include <binder/IBinder.h>

#include <binder/Parcel.h>

#include <binder/ProcessState.h>

#include <binder/IPCThreadState.h>

using namespace android;

#ifdef LOG_TAG

#undef LOG_TAG

#endif

#define LOG_TAG "sampleService"

#define SAMPLE_SERIVCE_DES "sample.hello"

#define FUNC_CALLFUNCTION 1

class SampleService: public BBinder {

public:

     SampleService() {

          mydescriptor = String16(SAMPLE_SERIVCE_DES);

     }

     

     virtual ~SampleService() {

     }

     virtual const String16& getInterfaceDescriptor() const {

           return mydescriptor;

     }

     

protected:

     

     void callFunction() {

          LOGE( "Service callFunction-----------");

     }

     

     virtual status_t onTransact(uint32_t code, const Parcel& data,

              Parcel* reply, uint32_t flags = 0) {

          LOGD( "Service onTransact, code = %d" , code);

           switch (code) {

           case FUNC_CALLFUNCTION:

              callFunction();

               break;

           default:

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

          }

           return 0;

     }

private:

     String16 mydescriptor;

};

int main() {

     sp < IServiceManager > sm = defaultServiceManager();

     SampleService* samServ = new SampleService();

     status_t ret = sm->addService(String16(SAMPLE_SERIVCE_DES), samServ);

     LOGD("Service main addservice ");

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

     IPCThreadState::self()->joinThreadPool( true);

     return 0;

}

Android.mk

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LOCAL_PATH:= $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE_TAGS := eng

LOCAL_SRC_FILES:= \

           sampleService.cpp

LOCAL_C_INCLUDES += \

        $(LOCAL_PATH) \

LOCAL_SHARED_LIBRARIES : = \

    libcutils \

    libbinder \

    libutils \

    libhardware

LOCAL_CFLAGS := -DRIL_SHLIB

LOCAL_MODULE:= sampleService

include $(BUILD_EXECUTABLE)

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1、先编译好服务，然后将服务跑起来

2、运行android程序，抓log