Native向System Service Binder通信实现：SensorService.cpp 将应用使用sensor enable和disable事件通过binder方式上报到System server的示例。
Client端实现实例
1 调用示例：例如SensorService.cpp
appRecordSdk.sendEvent(212,connection->getUid(),String16(ss.str().c_str()))
// 引入Binder客户端SDK头文件#include "../../include/binder/FadiRecordSdk.h"android::FadiRecordSdk fadiRecordSdk; // 全局单例status_t SensorService::enable(...) { ... // 构造事件数据：传感器句柄|PID|UID|包名|类型|采样周期 std::ostringstream ss; ss << handle << "|" << (thread ? thread->getCallingPid() : -1) << "|" << uid << "|" << connection->getPackageName() << "|" << (sensor ? sensor->getSensor().getType() : -1) << "|" << samplingPeriodNs; // 通过Binder发送事件到SystemServer（消息ID=212） fadiRecordSdk.sendEvent(212, connection->getUid(), String16(ss.str().c_str())); }} 2 FadiRecordSdk.h
#ifndef ANDROID_FADIRECORD#define ANDROID_FADIRECORD#include <binder/IInterface.h>#include <binder/Parcel.h>#include <utils/String16.h>namespace android {class FadiRecordSdk {public: /** * @brief 发送事件到SystemServer * @param msgId 事件类型（如212=传感器事件） * @param arg0 附加参数（如调用方UID） * @param str 序列化的事件数据 */ void sendEvent(int32_t msgId, int32_t arg0, const String16& str); // Binder事务码定义（需与AIDL接口TRANSACTION_*对齐） enum { SEND_EVENT = IBinder::FIRST_CALL_TRANSACTION + 1 // 对应TRANSACTION_sendEvent };private: static sp<IBinder> remote; // 远程服务代理（缓存在客户端）};} // namespace android#endif // ANDROID_FADIRECORD备注这里的SEND_EVENT 对应 IFadiRecordInterface 中的TRANSACTION_sendEvent
public abstract static class Stub extends Binder implements IFadiRecordInterface { private static final String DESCRIPTOR = "com.fadi.fadirecord.IFadiRecordInterface"; static final int TRANSACTION_setEnable = 1; static final int TRANSACTION_sendEvent = 2;3 FadiRecordSdk.cpp
通过Parcel序列化数据将事件通过IAppRecordInterface.aidl接口上报到systemServe的AppRecordService服务，Parcel机制：跨进程传递的数据需序列化，支持基本类型、String、Parcelable对象等
#include "binder/FadiRecordSdk.h"#include <binder/IServiceManager.h>namespace android {sp<IBinder> FadiRecordSdk::remote = nullptr;void FadiRecordSdk::sendEvent(int32_t msgId, int32_t arg0, const String16& str) { Parcel data, reply; // 写入接口令牌（需与服务端DESCRIPTOR一致） data.writeInterfaceToken(String16("com.fadi.fadiRecord.IFadiRecordInterface")); data.writeInt32(msgId); // 事件ID data.writeInt32(arg0); // 参数1 data.writeString16(str); // 参数2（序列化数据） // 延迟初始化：首次调用时获取远程服务代理 if (!remote) { remote = defaultServiceManager()->getService(String16("FadiRecordService")); } // 异步调用（FLAG_ONEWAY不等待返回） if (remote) { remote->transact(SEND_EVENT, data, &reply, IBinder::FLAG_ONEWAY); }}} // namespace android4 Android.bp
cc_defaults { name: "libbinder_common_defaults", host_supported: true, srcs: [ "Binder.cpp", ... "FadiRecordSdk.cpp", ... ],服务端实现实例
1. FadiRecordService 服务注册（SystemServer）
public class FadiRecordService extends SystemService { private final IFadiRecordInterface.Stub mBinder = new FadiRecordStub(); @Override public void onStart() { // 注册Binder服务到ServiceManager publishBinderService("FadiRecordService", mBinder); // 添加内部API（可选） LocalServices.addService(FadiRecordInternal.class, new FadiRecordInternal()); }}2.AIDL接口定义（IFadiRecordInterface.aidl）
FLAG_ONEWAY表示"不用等回信"
// 包名需与writeInterfaceToken()一致package com.fadi.fadiRecord;interface IFadiRecordInterface { /** * @param eventId 事件类型（如212） * @param arg 附加参数（UID等） * @param msg 格式化数据（由Native层拼接） */ oneway void sendEvent(int eventId, int arg, String msg);}3. AppRecordService的SE-linux权限配置
相关SE-linux也是需要配置
# service_contexts.teFadiRecordService u:object_r:fadi_record_service:s0# service.tetype fadi_record_service, system_server_service, service_manager_type;运行结果
打开一个运动app，就可以看到使用sensor的事件被从native中传递到system server中了哈
sensorDisableEvent:pid=10228,message=19|7396|10228|com.tencent.mm.plugin.sport.model.a0|19sensorEnableEvent:pid=10228,message=19|7396|10228|com.tencent.mm.plugin.sport.model.a0|19|600000000