Android Binder序列2（实例）

Android Binder序列2（实例）---Native层使用Java层Binder服务

一、实现步骤详解

•    获取远程BinderFunManager服务端代理

//获取系统服务BinderFunManager代理
sp<IBinder>  getBinderFunService()
{
	sp<IServiceManager> sm = defaultServiceManager();
	return sm->getService(String16("BinderFunManager")); 
}

• 跨进程调用

        static String16 mydescriptor = String16("com.xxx.binderapifun.server.BinderFunManager");
        data.writeInterfaceToken(mydescriptor);
		static String16 str = String16("I am client from Native call");
		
		
		data.writeString16(str);
		binderFun->transact(TRANSAVTION_FUN, data, &reply, 0);
		int result = reply.readInt32();
		LOGE(TAG,"transact result : %d\n", result);
		size_t datasize = reply.dataSize();
        const uint8_t *data = reply.data();

        for (int i = 0;i<datasize ;i++) {
                LOGE(TAG,"Client data[%d] = %x",i,data[i]);
        }

这样一次跨进程调用就实现了，是不是很简单。下面看看具体的调用结果

10-22 13:44:01.350 23625 23638 D BinderApiFun: FUN : I am client from Native call
10-22 13:44:01.352 25131 25131 E NativeClient: transact result : 0
10-22 13:44:01.352 25131 25131 E NativeClient: Client data[0] = 0
10-22 13:44:01.352 25131 25131 E NativeClient: Client data[1] = 0
10-22 13:44:01.352 25131 25131 E NativeClient: Client data[2] = 0
10-22 13:44:01.352 25131 25131 E NativeClient: Client data[3] = 0

具体实现代码如下

#include <pthread.h>
#include <sys/file.h>//flock's head
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <android/log.h>
#include <errno.h>
#include <binder/IServiceManager.h>
#include <binder/IBinder.h>
#include <binder/Parcel.h>
#include <binder/ProcessState.h>
#include <binder/IPCThreadState.h>
#include <private/binder/binder_module.h>
#include <string.h>
#include <cutils/properties.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/stat.h>
#include <linux/fs.h>
#include <stdarg.h>
#include <stdlib.h>

using namespace android;


#define LOGE(TAG,...) if(1) __android_log_print(ANDROID_LOG_ERROR, TAG, __VA_ARGS__);
sp<IBinder> binderFun = NULL;//BinderFunManager的binder客户端
#define TRANSAVTION_FUN 1

#ifndef NULL
#define NULL  (void*)0
#endif




#define TAG "NativeClient"

//获取系统服务BinderFunManager代理
sp<IBinder>  getBinderFunService()
{
	sp<IServiceManager> sm = defaultServiceManager();
	return sm->getService(String16("BinderFunManager")); 
}

extern "C" {

int  main(void)
{
	binderFun = getBinderFunService(); 
	Parcel data,reply;
	if(binderFun != NULL)
	{
    	static String16 mydescriptor = String16("com.xxx.binderapifun.server.BinderFunManager");
        data.writeInterfaceToken(mydescriptor);
		static String16 str = String16("I am client from Native call");
		
		
		data.writeString16(str);
		binderFun->transact(TRANSAVTION_FUN, data, &reply, 0);
		int result = reply.readInt32();
		LOGE(TAG,"transact result : %d\n", result);
		size_t datasize = reply.dataSize();
        const uint8_t *data = reply.data();

        for (int i = 0;i<datasize ;i++) {
                LOGE(TAG,"Client data[%d] = %x",i,data[i]);
        }
		
    	}else{
		    LOGE(TAG,"BinderFunManager service not exist\n");
	    }
	    return 0;
    }

}