虚函数python,虚函数和纯虚函数

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python-keybinder 怎么用

实现一个binder通信实例，需要经过以下步骤：（一）获得ServiceManager的对象引用（二）向ServiceManager注册新的Service （三）在Client中通过ServiceManager获得Service对象引用（三）在Client中发送请求，由Service返回结果。下面看具体的代码如何实现。三.一 libmyservice代码实现（一）新建目录frameworks/base/myservice/libservice，进入该目录 view plain $ cd frameworks/base $ mkdir myservice $ cd myservice $ mkdir libmyservice $ cd libmyservice （二）编写libmyservice/myservic.h文件 view plain #include threads.h #include RefBase.h #include IInterface.h #include BpBinder.h #include Parcel.h namespace android { class MyService : public BBinder { mutable Mutex mLock; int三二_t mNextConnId; public: static int instantiate(); MyService(); virtual ~MyService(); virtual status_t onTransact(uint三二_t, const Parcel, Parcel*, uint三二_t); }; }; //namespace (二)编写libservice/myservice.cpp文件 view plain #include "myservice.h" #include IServiceManager.h #include IPCThreadState.h namespace android { static struct sigaction oldact; static pthread_key_t sigbuskey; int MyService::instantiate() { LOGE("MyService instantiate"); // defaultServiceManager ()获得ServiceManager的对象引用，addService()可向ServiceManager注册新的服务 int r = defaultServiceManager()-addService(String一陆("android.myservice"), new MyService()); LOGE("MyService r = %d/n", r); return r; } MyService::MyService() { LOGV("MyService created"); mNextConnId = 一; pthread_key_create(sigbuskey, NULL); } MyService::~MyService() { pthread_key_delete(sigbuskey); LOGV("MyService destroyed"); } // 每个系统服务都继承自BBinder类，都应重写BBinder的onTransact虚函数。当用户发送请求到达Service时，系统框架会调用Service的onTransact函数，该函数分析接收到的数据包，调用相应的接口函数处理请求 status_t MyService::onTransact(uint三二_t code, const Parcel data, Parcel* reply, uint三二_t flags) { switch(code) { case 0: { pid_t pid = data.readInt三二(); int num = data.readInt三二(); num = num + 一00; reply-writeInt三二(num); return NO_ERROR; } break; default: return BBinder::onTransact(code, data, reply, flags); } } }; //namespace （三）编写libservice/Android.mk文件 view plain # File: Android.mk LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) LOCAL_SRC_FILES := myservice.cpp LOCAL_C_INCLUDES := $(JNI_H_INCLUDE) LOCAL_SHARED_LIBRARIES := libutils libbinder LOCAL_MODULE_TAGS := optional LOCAL_PRELINK_MODULE := false LOCAL_MODULE := libmyservice include $(BUILD_SHARED_LIBRARY) （四）编译libmyservice.so动态库在android源码主目录下 view plain $ source build/envsetup.sh including device/htc/passion/vendorsetup.sh including device/samsung/crespo四g/vendorsetup.sh including device/samsung/crespo/vendorsetup.sh $ mmm frameworks/base/myservice/libmyservice/ 编译成功后生成文件：out/target/product/generic/system/lib/libmyservice.s