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Binder实用指南（二） - 实战篇
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Binder实用指南（二） - 实战篇
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本章的內容主要說明如何在JavaFramework層和Native層自定義Client-Server組件，并且使用Binder進行通信。
一、Native Binder
源碼目錄結構:
alps/frameworks/native/cmds/NativeBinderDemo/
| 123456 | |-NativeBinderDemo|---ClientDemo.cpp: 客戶端程序|---ServerDemo.cpp：服務端程序|---IMyService.h：自定義的MyService服務的頭文件|---IMyService.cpp：自定義的MyService服務|---Android.mk：源碼build文件 |
1.1 服務端
alps/frameworks/native/cmds/NativeBinderDemo/ServerDemo.cpp
獲取ServiceManager，注冊service.myservice服務到ServiceManager，啟動服務。
| 123456789 | int main() {sp < IServiceManager > sm = defaultServiceManager(); //獲取service manager引用sm->addService(String16("service.myservice"), new BnMyService()); //注冊名為"service.myservice"的服務到service managerProcessState::self()->startThreadPool(); //啟動線程池IPCThreadState::self()->joinThreadPool(); //把主線程加入線程池 return 0;} |
1.2 客戶端
alps/frameworks/native/cmds/NativeBinderDemo/ClientDemo.cpp
獲取ServiceManager，拿到service.myservice服務，再進行類型轉換成IMyService，最后調用遠程方法sayHello()
| 123456789 | int main() {sp < IServiceManager > sm = defaultServiceManager(); //獲取service manager引用sp < IBinder > binder = sm->getService(String16("service.myservice"));//獲取名為"service.myservice"的binder接口sp<IMyService> cs = interface_cast < IMyService > (binder);//將biner對象轉換為強引用類型的IMyServicecs->sayHello();//利用binder引用調用遠程sayHello()方法 return 0;} |
1.3 MyService
alps/frameworks/native/cmds/NativeBinderDemo/IMyService.h
申明IMyService，申明BpMyService（Binder客戶端），申明BnMyService（Binder的服務端）。
| 123456789101112131415161718192021222324252627282930313233343536373839404142 | using namespace android;namespace android{ class IMyService : public IInterface{ public:DECLARE_META_INTERFACE(MyService); //使用宏，申明MyService virtual void sayHello()=0; //定義方法}; //定義命令字段 enum{HELLO = 1,}; //申明客戶端BpMyService class BpMyService: public BpInterface<IMyService> { public:BpMyService(const sp<IBinder>& impl); virtual void sayHello();}; //申明服務端BnMyService class BnMyService: public BnInterface<IMyService> { public: virtual status_t onTransact(uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags = 0); virtual void sayHello();};} |
alps/frameworks/native/cmds/NativeBinderDemo/IMyService.cpp
| 123456789101112131415161718192021222324252627282930313233343536373839404142 | namespace android{IMPLEMENT_META_INTERFACE(MyService, "android.demo.IMyService"); //使用宏，完成MyService定義 //客戶端BpMyService::BpMyService(const sp<IBinder>& impl) :BpInterface<IMyService>(impl) {} // 實現客戶端sayHello方法 void BpMyService::sayHello() { printf("BpMyService::sayHello\n");Parcel data, reply;data.writeInterfaceToken(IMyService::getInterfaceDescriptor());remote()->transact(HELLO, data, &reply); printf("get num from BnMyService: %d\n", reply.readInt32());} //服務端，接收遠程消息，處理onTransact方法 status_t BnMyService::onTransact(uint_t code, const Parcel& data,Parcel* reply, uint32_t flags) { switch (code) { case HELLO: { //收到HELLO命令的處理流程 printf("BnMyService:: got the client hello\n");CHECK_INTERFACE(IMyService, data, reply);sayHello();reply->writeInt32(2015); return NO_ERROR;} break; default: break;} return NO_ERROR;} // 實現服務端sayHello方法 void BnMyService::sayHello() { printf("BnMyService::sayHello\n");};} |
1.4 Android.mk
| 12345678910111213141516171819202122232425262728 | LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS)LOCAL_SHARED_LIBRARIES := \libcutils \libutils \libbinder LOCAL_MODULE := ServerDemoLOCAL_SRC_FILES := \IMyService.cpp \ServerDemo.cpp LOCAL_MODULE_TAGS := optionalinclude $(BUILD_EXECUTABLE) include $(CLEAR_VARS)LOCAL_SHARED_LIBRARIES := \libcutils \libutils \libbinderLOCAL_MODULE := ClientDemoLOCAL_SRC_FILES := \IMyService.cpp \ClientDemo.cppLOCAL_MODULE_TAGS := optionalinclude $(BUILD_EXECUTABLE) |
1.5 原理圖
1.6 運行
編譯：
mm alps/frameworks/native/cmds/NativeBinderDemo目錄，然后到alps/out/target/product/{Project}/system/bin/會生成ClientDemo和ServerDemo
執行：
| 123 | adb remountadb push ServerDemo /system/binadb push ClientDemo /system/bin |
開兩個窗口分別執行下面兩個命令便可以看到結果了：
adb shell system/bin/ServerDemo?，?adb shell system/bin/ClientDemo
二、JavaFramework Binder
源碼目錄結構:
alps/frameworks/base/cmds/FrameworkBinderDemo/
| 12345678 | |-Server端|---ServerDemo.java：可執行程序|---IMyService.java: 定義IMyService接口|---MyService.java：定義MyService|-Client端|---ClientDemo.java：可執行程序|---IMyService.java: 與Server端完全一致|---MyServiceProxy.java：定義MyServiceProxy |
2.1 Server端
(1)ServerDemo.java
可執行程序
| 123456789101112 | public class ServerDemo { public static void main(String[] args) {System.out.println("MyService Start"); //準備Looper循環執行Looper.prepareMainLooper(); //設置為前臺優先級android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_FOREGROUND); //注冊服務ServiceManager.addService("MyService", new MyService());Looper.loop();}} |
(2)IMyService.java
定義sayHello()方法，DESCRIPTOR屬性
| 12345 | public interface IMyService extends IInterface { static final java.lang.String DESCRIPTOR = "com.yuanhh.frameworkBinder.MyServer"; public void sayHello(String str) throws RemoteException ; static final int TRANSACTION_say = android.os.IBinder.FIRST_CALL_TRANSACTION;} |
(3)MyService.java
| 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849 | public class MyService extends Binder implements IMyService{ public MyService() { this.attachInterface(this, DESCRIPTOR);} public IBinder asBinder() { return this;} /** 將MyService轉換為IMyService接口 **/ public static com.yuanhh.frameworkBinder.IMyService asInterface(android.os.IBinder obj) { if ((obj == null)) { return null;}android.os.IInterface iInterface = obj.queryLocalInterface(DESCRIPTOR); if (((iInterface != null)&&(iInterface instanceof com.yuanhh.frameworkBinder.IMyService))){ return ((com.yuanhh.frameworkBinder.IMyService) iInterface);} return null;} /** 服務端，接收遠程消息，處理onTransact方法 **/ protected boolean onTransact(int code, Parcel data, Parcel reply, int flags) throws RemoteException { switch (code) { case INTERFACE_TRANSACTION: {reply.writeString(DESCRIPTOR); return true;} case TRANSACTION_say: {data.enforceInterface(DESCRIPTOR);String str = data.readString();sayHello(str);reply.writeNoException(); return true;}} return super.onTransact(code, data, reply, flags);} /** 自定義sayHello()方法 **/ public void sayHello(String str) {System.out.println("MyService:: Hello, " + str);}} |
(4) Android.mk
| 12345678910111213141516 | LOCAL_PATH:= $(call my-dir)include $(CLEAR_VARS)LOCAL_SRC_FILES := $(call all-subdir-java-files)LOCAL_MODULE := ServerDemo LOCAL_MODULE_TAGS := optionalinclude $(BUILD_JAVA_LIBRARY)include $(CLEAR_VARS)LOCAL_MODULE := ServerDemoLOCAL_MODULE_TAGS := optionalLOCAL_MODULE_PATH := $(TARGET_OUT)/binLOCAL_MODULE_CLASS := UTILITY_EXECUTABLESLOCAL_SRC_FILES := ServerDemoinclude $(BUILD_PREBUILT) |
(5) ServerDemo
| 123 | base=/systemexport CLASSPATH=$base/framework/ServerDemo.jarexec app_process $base/bin com.shun.frameworkBinder.ServerDemo "$@" |
2.2 Client端
(1)ClientDemo.java
可執行程序
| 12345678910 | public class ClientDemo { public static void main(String[] args) throws RemoteException {System.out.println("Client start");IBinder binder = ServiceManager.getService("MyService"); //獲取名為"MyService"的服務IMyService myService = new MyServiceProxy(binder); //創建MyServiceProxy對象myService.sayHello("binder"); //通過MyServiceProxy對象調用接口的方法System.out.println("Client end");}} |
(2)IMyService.java
與Server端的IMyService是一致，基本都是拷貝一份過來。
(3)MyServiceProxy.java
| 1234567891011121314151617181920212223242526272829303132 | public class MyServiceProxy implements IMyService { private android.os.IBinder mRemote; //代表BpBinder public MyServiceProxy(android.os.IBinder remote) {mRemote = remote;} public java.lang.String getInterfaceDescriptor() { return DESCRIPTOR;} /** 自定義的sayHello()方法 **/ public void sayHello(String str) throws RemoteException {android.os.Parcel _data = android.os.Parcel.obtain();android.os.Parcel _reply = android.os.Parcel.obtain(); try {_data.writeInterfaceToken(DESCRIPTOR);_data.writeString(str);mRemote.transact(TRANSACTION_say, _data, _reply, 0);_reply.readException();} finally {_reply.recycle();_data.recycle();}} public IBinder asBinder() { return mRemote;}} |
(4) Android.mk
| 123456789101112131415 | LOCAL_PATH:= $(call my-dir)include $(CLEAR_VARS)LOCAL_SRC_FILES := $(call all-subdir-java-files)LOCAL_MODULE := ClientDemo LOCAL_MODULE_TAGS := optionalinclude $(BUILD_JAVA_LIBRARY)include $(CLEAR_VARS)LOCAL_MODULE := ClientDemoLOCAL_MODULE_TAGS := optionalLOCAL_MODULE_PATH := $(TARGET_OUT)/binLOCAL_MODULE_CLASS := UTILITY_EXECUTABLESLOCAL_SRC_FILES := ClientDemoinclude $(BUILD_PREBUILT) |
(5) ClientDemo
| 123 | base=/systemexport CLASSPATH=$base/framework/ClientDemo.jarexec app_process $base/bin com.shun.frameworkBinder.ClientDemo "$@" |
2.3 原理圖
2.4 運行
編譯：
mm alps/frameworks/base/cmds/FrameworkBinderDemo/目錄，然后：
alps/out/target/product/{Project}/system/bin/ 生成ClientDemo和ServerDemo
alps/out/target/product/{Project}/system/framework/ 生成ClientDemo.jar和ServerDemo.jar。
執行：
| 12345 | adb remountadb push ServerDemo /system/binadb push ClientDemo /system/binadb push ServerDemo.jar /system/framework/adb push ClientDemo.jar /system/framework/ |
開兩個窗口分別執行下面兩個命令便可以看到結果了：
adb shell system/bin/ServerDemo ， adb shell system/bin/ClientDemo
原文地址：?https://maoao530.github.io/2016/12/25/android-binder-02/
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