一个Native Service的完整示例.doc

一个Native Service的完整示例1. 准备工作(1)因为要调用Android源代码的framework/base里的一些类,所以要确保有android相关源代码(2)需要交叉编译器, 链接器等工具, 这个可以使用anroid源码里提供的工具,也可以使用单独下载的android ndk(3)可选: 如果在模拟器(AVD)上运行和调试, 还需要有编译好或者单独下载的android sdk及相应的组件等等, 关于各种组件需求,见/sdk/installing.html#components提到的Recommended Components, 确保满足Basic需求这里用的环境是android源码+单独下载的SDK(包括sdk toos, sdk platform tools和platform组件)2. 在android源码主目录/development子目录下建立工程目录, 我们的各个模块的代码都将放在这个目录的子目录下cd /android/developmentmkdir zp_module3. 建立service目录,里面放要做的native service源码ZPService.h1. #ifndef ANDROID_ZPSERVICE_H2. #define ANDROID_ZPSERVICE_H3.4. #include5. #include6. #include7.8. namespace android9. 10. classZPService:publicBBinder11. 12. private:13. /mutable Mutex m_Lock;14. /int32_t m_NextConnId;15.16. public:17. staticintInstance();18. ZPService();19. virtualZPService();20. virtual status_t onTransact(uint32_t,constParcel&,Parcel*,uint32_t);21. ;22. 23.24. #endifZPService.cpp1. #include2. #include3. #includeZPService.h4.5. namespace android6. 7. /static struct sigaction oldact;8. static pthread_key_t sigbuskey;9. 10. intZPService:Instance()11. 12. LOGE(ZPService Instantiaten);13. intret=defaultServiceManager()-addService(14. String16(zp.svc),new ZPService();15. LOGE(ZPService ret = %dn,ret);16. return ret;17. 18.19. ZPService:ZPService()20. 21. LOGV(ZPService createn);22. /m_NextConnId=1;23. pthread_key_create(&sigbuskey,NULL);24. 25.26. ZPService:ZPService()27. 28. pthread_key_delete(sigbuskey);29. LOGV(ZPService destoryn);30. 31.32. status_t ZPService:onTransact(uint32_t code,33. constParcel&data,34. Parcel*reply,35. uint32_t flags)36. 37. switch(code)38. 39. case0:40. 41. pid_t pid=data.readInt32();42. intnum=data.readInt32();43. num+=1000;44. reply-writeInt32(num);45. return NO_ERROR;46. break;47. default:48. return BBinder:onTransact(code,data,reply,flags);49. 50. 51. Android.mk1. LOCAL_PATH:=$(callmy-dir)2. include $(CLEAR_VARS)3. LOCAL_SRC_FILES:=ZPService.cpp4. LOCAL_SHARED_LIBRARIES:=libutils libbinder5. LOCAL_MODULE_TAGS:=optional6. LOCAL_MODULE:=libZPService7. LOCAL_PRELINK_MODULE:=false8. include $(BUILD_SHARED_LIBRARY)4. 建立svcserver目录,放置server源代码, 它主要用来将我们的service注册到系统.zpserver.cpp1. #include2. #include3. #include4. #include5. #include6. #include7. #include8. #include9. #include./service/ZPService.h10.11. using namespace android;12.13.14. intmain(intarg,char*argv)15. 16. printf(server - ain() beginn);17. spproc(ProcessState:self();18. spsm=defaultServiceManager();19. /LOGI(ServiceManager: %pn,sm.get();20. printf(server - erviceManager: %pn,sm.get();21. intret=ZPService:Instance();22. printf(server - ZPService:Instance return %dn,ret);23. ProcessState:self()-startThreadPool();Android.mk1. LOCAL_PATH:=$(callmy-dir)2. include $(CLEAR_VARS)3. LOCAL_SRC_FILES:=zpserver.cpp4. LOCAL_SHARED_LIBRARIES:=libutils libbinder libZPService5. LOCAL_MODULE_TAGS:=optional6. LOCAL_MODULE:=zpserver7. include $(BUILD_EXECUTABLE)5. 创建svcclient目录, 放置client源代码,它用于调用service提供的服务. 它编译成一个动态库,供其他可执行程序调用, 也可以直接将它和第6步的调用程序直接编译成一个可执行文件ZPClient.h1. #ifndef ANDROID_ZPCLIENT_H2. #define ANDROID_ZPCLIENT_H3.4. namespace android5. 6. classZPClient7. 8. public:9. intsetN(intn);10. private:11. static void getZPService();12. ;13. 14.15. #endifZPClient.cpp点击(此处)折叠或打开1. #include2. #include3. #includeZPClient.h4.5.6. namespace android7. 8. spbinder;9. 10. intZPClient:setN(intn)11. 12. getZPService();13. Parcel data,reply;14. data.writeInt32(getpid();15. data.writeInt32(n);16. 17. LOGE(client - binder-transact()n);18. binder-transact(0,data,&reply);19. intr=reply.readInt32();20. return r;21. 22.23. void ZPClient:getZPService()24. 25. spsm=defaultServiceManager();26. binder=sm-getService(String16(zp.svc);27. LOGE(client - etService: %pn,sm.get();28. if(binder=0)29. 30. LOGW(ZPService not published, waiting.);31. return;32. 33. 34.35. Android.mk1. LOCAL_PATH:=$(callmy-dir)2. include $(CLEAR_VARS)3. LOCAL_SRC_FILES:=ZPClient.cpp4. LOCAL_SHARED_LIBRARIES:=libutils libbinder5. LOCAL_MODULE_TAGS:=optional6. LOCAL_MODULE:=libZPClient7. LOCAL_PRELINK_MODULE:=false8. include $(BUILD_SHARED_LIBRARY)6. 创建svctest目录, 在里面开发一个测试程序,调用第5步的client库提供的接口,访问我们的servicetest.cpp1. #include2. #include./svcclient/ZPClient.h3.4. using namespace android;5.6. intmain(intargc,char*argv)7. 8. ZPClient client;9. intret=client.setN(2012);10. printf(setN return: %dn,ret);11. return 0;12. Android.mk1. LOCAL_PATH:=$(call my-dir)2. include $(CLEAR_VARS)3. LOCAL_SRC_FILES:=test.cpp4. LOCAL_SHARED_LIBRARIES:=libZPClient5. LOCAL_MODULE_TAGS:=optional6. LOCAL_MODULE:=svctest7. include $(BUILD_EXECUTABLE)完成以上几步后， 我们的工程的目录结构如下(zp_module的父目录是development):点击(此处)折叠或打开1. zp_module/2. |-Android.mk3. |-service4. |-Android.mk5. |-ZPService.cpp6. |-ZPService.h7. |-svcclient8. |-Android.mk9. |-ZPClient.cpp10. |-ZPClient.h11. |-svcserver12. |-Android.mk13. |-zpserver.cpp14. -svctest15. |-Android.mk16. -test.cpp7. 编译所有项目第一种方法, 进入android源码主目录,运行source build/envsetup.sh 或 . build/envsetup.sh然后进入development下你的源代码的各个子目录, 根据信赖性先后依次编译各个项目,比如进入development/zp_module/service, 运行 mm第二种方法, 在zp_module下创建一个Android.mk文件, 输入以下内容:1. include $(callall-subdir-makefiles然后直接在zp_module目录下运行mm8. 在模拟器里调试编译好的东西(1) 打开emulatoremulator -avd avd4.0.3 -scale 0.6 -partition-size 256(2) 打开adb, 等avd就绪后(用adb get-state查看状态,为device即准备好), 将编译好的库和可执行程序送入模拟器1. zpzp-desktop:$adb remount2. remount succeeded3. zpzp-desktop:$adb push/home/zp/android/out/target/product/generic/system/lib/libZPService.so/system/lib4. 210 KB/s(10216 bytesin0.047s)5. zpzp-desktop:$adb push/home/zp/android/out/target/product/generic