Android实战-利用Binder+Service实现累加器.ppt

Android实战利用BinderService实现累加器CMY2009-04-29,内容提要,内容五实现累加器,内容四实现接口给Java层使用,内容三自动启动BinderService,内容二实现Native层的BinderService,内容一概述,概述,Binder的流程可参考这篇文档：AndroidBinderIPCsystem先来看一下最终程序运行的效果图：,实现BinderService,在cupcake/frameworks/base目录下新建两个目录，一个实现BinderService，一个实现将我们的BinderService添加到ServiceManager：,libSimpleCalculator,libSimpleCalculator实现了BinderService它由以下几个文件组成：这些文件实现如下几个类：ISimpleCalculator接口类BpSimpleCalculatorclient能够获取到的类BnSimpleCalculator实现具体功能SimpleCalculator同上,ISimpleCalculator.h,classISimpleCalculator:publicIInterfacepublic:DECLARE_META_INTERFACE(SimpleCalculator);virtualintaddValue(constint32_tiValue)=0;virtualintgetValue()const=0;classBnSimpleCalculator:publicBnInterfacepublic:BnSimpleCalculator();BnSimpleCalculator();virtualstatus_tonTransact(uint32_tcode,constParcel,ISimpleCalculator.cpp,enumADD_VALUE=IBinder:FIRST_CALL_TRANSACTION,GET_VALUE,;classBpSimpleCalculator:publicBpInterface.virtualintgetValue()constLOGI(BpSimpleCalculator:getValuetransact(GET_VALUE,data,SimpleCalculator.h,#includeISimpleCalculator.h“.classSimpleCalculator:publicBnSimpleCalculatorprivate:int32_tm_iValue;public:staticvoidinstantiate();virtualstatus_tonTransact(uint32_tcode,constParcel,SimpleCalculator.cpp,#defineLOG_TAGSimpleCalculator“#includeSimpleCalculator.h“voidSimpleCalculator:instantiate()LOGI(SimpleCalculator:instantiateaddService(String16(android.SimpleCalculator),newSimpleCalculator();status_tSimpleCalculator:onTransact(uint32_tcode,constParcel.,Android.mk,LOCAL_PATH:=$(callmy-dir)include$(CLEAR_VARS)TARGET_PRELINK_MODULE:=falseLOCAL_SRC_FILES:=ISimpleCalculator.cppSimpleCalculator.cppLOCAL_SHARED_LIBRARIES:=libcutilslibutilsLOCAL_MODULE:=libSimpleCalculatorinclude$(BUILD_SHARED_LIBRARY),startSimpleCalculator,startSimpleCalculator用于启动SimpleCalculator这个BinderService：,startSimpleCalculator.cpp,#include#include#include#include#include#include#include#includeSimpleCalculator.husingnamespaceandroid;intmain(intargc,char*argv)LOGI(EnterstartSimpleCalculatorproc(ProcessState:self();spsm=defaultServiceManager();LOGI(CurrentServiceManager:%p,sm.get();SimpleCalculator:instantiate();ProcessState:self()-startThreadPool();IPCThreadState:self()-joinThreadPool();,Android.mk,LOCAL_PATH:=$(callmy-dir)include$(CLEAR_VARS)LOCAL_SRC_FILES:=startSimpleCalculator.cppLOCAL_SHARED_LIBRARIES:=libutilslibSimpleCalculatorbase:=$(LOCAL_PATH)/./.LOCAL_C_INCLUDES:=$(base)/SimpleCalculator/libSimpleCalculatorLOCAL_MODULE:=startSimpleCalculatorinclude$(BUILD_EXECUTABLE),编译,完全编译#make部分编译启动编译环境：cupcake#.build/envsetup.sh接着再进入你要编译的目录执行mmcupcake/frameworks/base/SimpleCalculator/libSimpleCalculator#mm输出文件在generic/system/lib/libSimpleCalculator.socupcake/frameworks/base/SimpleCalculator/startSimpleCalculator#mm输出文件在generic/system/bin/startSimpleCalculator如果你需要用到system.img，请执行以下命令：cupcake#makesnod生成新的system.img,自动启动BinderService,打开root/init.rc，在该文件末尾加入新的service:serviceSimpleCalculator/system/bin/startSimpleCalculatoruserrootgroupsystem*如果你要用到ramdisk.img，使用cpio命令生成新的ramdisk.img运行仿真器，在Logcat中将会看到如下内容：.I/(547):EnterstartSimpleCalculatorSimpleCalculator:instantiateBnSimpleCalculator:BnSimpleCalculatorSimpleCalculator:SimpleCalculatorEnterandroid_os_SimpleCalculator_addValue:%dms=get_SimpleCalculatorInterface();/get_native_MyService(env,clazz);if(ms=0)return0;returnms-addValue(iValue);staticjintandroid_os_SimpleCalculator_getValue(JNIEnv*env,jobjectclazz)LOGI(Enterandroid_os_SimpleCalculator_getValuems=get_SimpleCalculatorInterface();/get_native_MyService(env,clazz);if(ms=0)return0;returnms-getValue();,/*JNIregistration.*/staticJNINativeMethodgMethods=native_addValue,(I)I,(void*)android_os_SimpleCalculator_addValue,native_