说究竟，Java层的service就是就C++层的binder的封装。所以从原理上来讲通过C++代码直接訪问android framework层的service是全然可能的，这篇文章以訪问WifiService为例，解说怎样去实现这个功能。

费话少说。直接上代码：

WifiTest.cpp

#include <sys/types.h>

#include <unistd.h>

#include <grp.h>

#include <binder/IPCThreadState.h>

#include <binder/ProcessState.h>

#include <binder/IServiceManager.h>

#include <utils/Log.h>

#include <utils/String16.h>

//#include <utils/Vector.h>

#include <utils/List.h>

#include <utils/PropertyMap.h>

using namespace android;

#define WIFI_SERVICE  "wifi"

const String16 WIFI_DESCRIPTOR("android.net.wifi.IWifiManager");

class ScanResult

{

private:

    ScanResult& operator=(const ScanResult& o);

public:

    ScanResult(const ScanResult& o):

        mSsid(o.mSsid),mBssid(o.mBssid),mCaps(o.mCaps),mLevel(o.mLevel),mFrequency(o.mFrequency),mTimestamp(o.mTimestamp)

    {

    }

    ScanResult(String8 ssid,String16 bssid,String16 caps,int level,int freq,int64_t timeStamp):

        mSsid(ssid),mBssid(bssid),mCaps(caps),mLevel(level),mFrequency(freq),mTimestamp(timeStamp)

    {

    }

    void dump()

    {

        char temp[130];

        int size;

        memset(temp,0,sizeof(temp));

        printf("ssid %s \n",mSsid.string());

        size = mBssid.size();

        if(size > sizeof(temp)/2 - 1)

        {

            size = sizeof(temp)/2 - 1;

        }

        utf16_to_utf8(mBssid.string(), size, temp);

        printf("Bssid %s \n",temp);

        size = mCaps.size();

        if(size > sizeof(temp)/2 - 1)

        {

            size = sizeof(temp)/2 - 1;

        }

        utf16_to_utf8(mCaps.string(), size, temp);

        printf("ssid %s \n",temp);

        printf("level %d \n",mLevel);

        printf("freq %d \n",mFrequency);

        printf("freq %ld \n",mTimestamp);

    }

private:

    String8 mSsid;

    String16 mBssid;

    String16 mCaps;

    int mLevel;

    int mFrequency;

    int64_t mTimestamp;

};

class IWifiService: public android::IInterface {

public:

        DECLARE_META_INTERFACE(WifiService)

        virtual void startScan(int forceActive) = 0;

        virtual int getScanResults(List<ScanResult> &list) = 0;

        virtual bool setWifiEnabled(bool enable) = 0;

};

class BpWifiService: public android::BpInterface<IWifiService>

{

    enum

    {

        FIRST_CALL_TRANSACTION = 1,

        TRANSACTION_getConfiguredNetworks = (android::IBinder::FIRST_CALL_TRANSACTION + 0),

        TRANSACTION_addOrUpdateNetwork = (android::IBinder::FIRST_CALL_TRANSACTION + 1),

        TRANSACTION_removeNetwork = (android::IBinder::FIRST_CALL_TRANSACTION + 2),

        TRANSACTION_enableNetwork = (android::IBinder::FIRST_CALL_TRANSACTION + 3),

        TRANSACTION_disableNetwork = (android::IBinder::FIRST_CALL_TRANSACTION + 4),

        TRANSACTION_pingSupplicant = (android::IBinder::FIRST_CALL_TRANSACTION + 5),

        TRANSACTION_startScan = (android::IBinder::FIRST_CALL_TRANSACTION + 6),

        TRANSACTION_getScanResults = (android::IBinder::FIRST_CALL_TRANSACTION + 7),

        TRANSACTION_disconnect = (android::IBinder::FIRST_CALL_TRANSACTION + 8),

        TRANSACTION_reconnect = (android::IBinder::FIRST_CALL_TRANSACTION + 9),

        TRANSACTION_reassociate = (android::IBinder::FIRST_CALL_TRANSACTION + 10),

        TRANSACTION_getConnectionInfo = (android::IBinder::FIRST_CALL_TRANSACTION + 11),

        TRANSACTION_setWifiEnabled = (android::IBinder::FIRST_CALL_TRANSACTION + 12),

        TRANSACTION_getWifiEnabledState = (android::IBinder::FIRST_CALL_TRANSACTION + 13),

        TRANSACTION_setCountryCode = (android::IBinder::FIRST_CALL_TRANSACTION + 14),

        TRANSACTION_setFrequencyBand = (android::IBinder::FIRST_CALL_TRANSACTION + 15),

        TRANSACTION_getFrequencyBand = (android::IBinder::FIRST_CALL_TRANSACTION + 16),

        TRANSACTION_isDualBandSupported = (android::IBinder::FIRST_CALL_TRANSACTION + 17),

        TRANSACTION_saveConfiguration = (android::IBinder::FIRST_CALL_TRANSACTION + 18),

        TRANSACTION_getDhcpInfo = (android::IBinder::FIRST_CALL_TRANSACTION + 19),

        TRANSACTION_acquireWifiLock = (android::IBinder::FIRST_CALL_TRANSACTION + 20),

        TRANSACTION_updateWifiLockWorkSource = (android::IBinder::FIRST_CALL_TRANSACTION + 21),

        TRANSACTION_releaseWifiLock = (android::IBinder::FIRST_CALL_TRANSACTION + 22),

        TRANSACTION_initializeMulticastFiltering = (android::IBinder::FIRST_CALL_TRANSACTION + 23),

        TRANSACTION_isMulticastEnabled = (android::IBinder::FIRST_CALL_TRANSACTION + 24),

        TRANSACTION_acquireMulticastLock = (android::IBinder::FIRST_CALL_TRANSACTION + 25),

        TRANSACTION_releaseMulticastLock = (android::IBinder::FIRST_CALL_TRANSACTION + 26),

        TRANSACTION_setWifiApEnabled = (android::IBinder::FIRST_CALL_TRANSACTION + 27),

        TRANSACTION_getWifiApEnabledState = (android::IBinder::FIRST_CALL_TRANSACTION + 28),

        TRANSACTION_getWifiApConfiguration = (android::IBinder::FIRST_CALL_TRANSACTION + 29),

        TRANSACTION_setWifiApConfiguration = (android::IBinder::FIRST_CALL_TRANSACTION + 30),

        TRANSACTION_startWifi = (android::IBinder::FIRST_CALL_TRANSACTION + 31),

        TRANSACTION_stopWifi = (android::IBinder::FIRST_CALL_TRANSACTION + 32),

        TRANSACTION_addToBlacklist = (android::IBinder::FIRST_CALL_TRANSACTION + 33),

        TRANSACTION_clearBlacklist = (android::IBinder::FIRST_CALL_TRANSACTION + 34),

        TRANSACTION_getWifiServiceMessenger = (android::IBinder::FIRST_CALL_TRANSACTION + 35),

        TRANSACTION_getWifiStateMachineMessenger = (android::IBinder::FIRST_CALL_TRANSACTION + 36),

        TRANSACTION_getConfigFile = (android::IBinder::FIRST_CALL_TRANSACTION + 37),

        TRANSACTION_captivePortalCheckComplete = (android::IBinder::FIRST_CALL_TRANSACTION + 38),

    };

public:

        BpWifiService(const android::sp<android::IBinder>& impl): android::BpInterface<IWifiService>(impl)

        {

        }

        void startScan(int forceActive)

        {

            android::Parcel data, reply;

            data.writeInterfaceToken(WIFI_DESCRIPTOR);

            if (forceActive)

            {

                data.writeInt32(1);

            }

            else

            {

                data.writeInt32(0);

            }

            remote()->transact(TRANSACTION_startScan, data, &reply, 0);

        }

        virtual int getScanResults(List<ScanResult> &list)

        {

            Parcel data, reply;

            data.writeInterfaceToken(WIFI_DESCRIPTOR);

            remote()->transact(TRANSACTION_getScanResults, data, &reply, 0);

            if (0 != reply.readExceptionCode())

            {

                return 0;

            }

            int count = reply.readInt32();

            for (int i=0;i<count;i++)

            {

                String8 ssid;

                int res =  reply.readInt32();

                if (res != 0)

                {

                    reply.readInt32();

                    reply.readInt32();

                    int length = reply.readInt32();

                    ssid = String8((const char*)reply.readInplace(length),length);

                }

//                utf16_to_utf8(const char16_t* src, size_t src_len, char* dst);

                String16 BSSID = reply.readString16();

                String16 caps = reply.readString16();

                int level = reply.readInt32();

                int frequency = reply.readInt32();

                int64_t timestamp = reply.readInt64();

                ScanResult result(ssid,BSSID,caps,level,frequency,timestamp);

                list.push_back(result);

            }

            return count;

        }

        bool setWifiEnabled(bool enable)

        {

            Parcel data, reply;

            data.writeInterfaceToken(WIFI_DESCRIPTOR);

            if(enable)

                data.writeInt32(1);

            else

                data.writeInt32(0);

            remote()->transact(TRANSACTION_setWifiEnabled, data,&reply,0);

            reply.readExceptionCode();

            return 0!=reply.readInt32();

        }

};

IMPLEMENT_META_INTERFACE(WifiService, WIFI_DESCRIPTOR)

int main(int argc, char *argv[])

{

    android::sp<android::IServiceManager> sm = android::defaultServiceManager();

    android::sp<android::IBinder> binder;

    android::sp<IWifiService> wifi;

    binder = sm->getService(android::String16(WIFI_SERVICE));

    if (binder == 0)

    {

        return 1;

    }

    wifi = android::interface_cast<IWifiService>(binder);

    wifi->setWifiEnabled(true);

	printf("+++++scan start");

	wifi->startScan(1);

	for(int i=0;i<10;i++)

	{

		usleep(1*1000*1000);

		List<ScanResult> list;

		wifi->getScanResults(list);

		if(list.size() > 0)

	    {

	        for(List<ScanResult>::iterator it = list.begin();it != list.end();++it)

	        {

	            (*it).dump();

	        }

	        break;

	    }

	}

    return(0);

}

主要的思路非常easy：

先通过：

android::defaultServiceManager()->getService(android::String16(WIFI_SERVICE));

获取binder接口。再通过Parcel读与binder，详细的实现能够參考IWifiManager.java的代码。

编译后执行以上的代码能够得到类似下面的输出：

ssid wifitest

Bssid b8:55:10:84:13:57

ssid [WPA-PSK-CCMP][WPA2-PSK-CCMP][WPS][ESS]

level -55

freq 2447

time stamp 1073922473

ssid test

Bssid 08:bd:43:c3:a9:96

ssid [WPA2-PSK-CCMP][WPS][ESS]

level -66

freq 2462

time stamp 1073922473

完整代码下载：

http://download.csdn.net/detail/i2cbus/7613361

怎样从C++代码直接訪问android framework层的WifiService的更多相关文章

  1. Kivy A to Z -- 怎样从python代码中直接訪问Android的Service

    在Kivy中,通过pyjnius扩展能够间接调用Java代码,而pyjnius利用的是Java的反射机制.可是在Python对象和Java对象中转来转去总让人感觉到十分别扭.好在android提供了b ...

  2. Android Framework层Power键关机流程（一，Power长按键操作处理）

    一:Android处理Power按键长按操作 在Framework层中,Android4.x对Power键(KeyEvent.KEYCODE_POWER)的操作,我们从PhoneWindowManag ...

  3. Android Framework层Power键关机流程（二，关机流程）

    二,关机流程 从前一篇博文我们知道,当用户长按Power键时会弹出(关机.重启,飞行模式等选项)对话框,我们点击关机,则会弹出关机确认对话框.那么从选项对话框到关机确认对话框又是一个什么流程呢.下面我 ...

  4. Android framework层实现实现wifi无缝切换AP

    http://www.linuxidc.com/Linux/2013-12/93476.htm Android市场上有一款叫Wifijumper的软件,实现相同ssid的多个AP之间根据wifi信号的 ...

  5. Android与WebView的同步和异步訪问机制

    大家都知道.通过WebView,我们能够在Androidclient.用Web开发的方式来开发我们的应用. 假设一个应用就是单纯一个WebView.全部的逻辑都仅仅须要在网页上交互的话,那我们事实上就 ...

  6. 如何调试Android Framework？

    Linus有一句名言广为人知:Read the fucking source code. 但其实,要深入理解某个软件.框架或者系统的工作原理,仅仅「看」代码是远远不够的.就拿Android Frame ...

  7. Android通过HTTP POST带參訪问asp.net网页

    在看了网络上非常多视频关于android通过HTTP POST或者GET方式訪问网页并获取数据的方法. 自己也copy了一份来測试.并通过C#.NET搭建了一个简单的后台,但发现传參时,依照网上的方式 ...

  8. Android开发之使用URL訪问网络资源

    Android开发之使用URL訪问网络资源 URL (UniformResource Locator)对象代表统一资源定位器,它是指向互联网"资源"的指针. 资源能够是简单的文件或 ...

  9. Android中关于JNI 的学习（三）在JNI层訪问Java端对象

    前面两篇文章简介了JNI层跟Java层的一些相应关系,包含方法名,数据类型和方法名称等,相信在理论层面.可以非常好地帮助我们去了解JNI在Native本地开发中的作用,对JNI的一些概念也有了一个初步 ...

随机推荐

  1. python mysql数据库 'latin-1' codec can't encode character错误问题解决

    "UnicodeEncodeError:'latin-1' codec can't encode character ..."     This is because MySQLd ...

  2. [Apple开发者帐户帮助]二、管理你的团队（6）找到您的团队ID

    该组ID是已分配给您的团队苹果产生了独特的10个字符的字符串.您需要为某些活动提供您的团队ID, 例如将您的应用程序转移到App Store Connect中的其他开发人员. 在您的开发者帐户中,单击 ...

  3. A - Word

    Problem description Vasya is very upset that many people on the Net mix uppercase and lowercase lett ...

  4. 【MFC】在MFC中PreTranslateMessage()的使用方法

    BOOL CSearchuserDlg::PreTranslateMessage(MSG* pMsg) { if (pMsg->message==WM_KEYDOWN) // 判断是否有按键按下 ...

  5. spring data jpa 、hibernate、jpa之间的关系

    引用:http://blog.csdn.net/u014421556/article/details/52635000 hibernate作为JPA的实现.   JPA规范与ORM框架之间的关系   ...

  6. 【Linux】磁盘分区

    我们在Linux操作过程中,可能会遇到磁盘分区的问题.这篇文章是对/dev/sdb 这块磁盘进行分区. linux分区不同于windows,linux下硬盘设备名为(IDE硬盘为hdx(x为从a—d) ...

  7. C# 写入二进制文件

    写入整型25 文件在MiniHex中显示 写入字符串I am happy 0A 6D - 6D - 这一行数据是C#把字符串转换为16进制形式 不知道为啥用MiniHex打开多了个0A 写入空&quo ...

  8. HTML5 video常用属性

    一.视频video常用标签方法 <!-- controls 控制条,播放暂停等 controlslist 控制不允许全屏 不允许下载等 poster 封面 autoplay 自动播放 muted ...

  9. 团体程序设计天梯赛-练习集-L1-034. 点赞

    L1-034. 点赞 时间限制 200 ms 内存限制 65536 kB 代码长度限制 8000 B 判题程序 Standard 作者 陈越 微博上有个“点赞”功能,你可以为你喜欢的博文点个赞表示支持 ...

  10. python tips:matplotlib保存多张图片时，图片会相互叠加

    问题: 使用matplotlib的pyplot.savefig保存图片时,前面的图会不断叠加到后面的图中. 原因: savefig方法保存图片并不会重置画布,所以导致图片的相互叠加. 解决方法: 保存 ...