JAVA层HIDL服务的获取原理-Android10.0 HwBinder通信原理（九）
摘要：本节主要来讲解Android10.0 JAVA层HIDL服务的获取原理
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[Android取经之路] 的源码都基于Android-Q（10.0） 进行分析
[Android取经之路] 系列文章：
《系统启动篇》
- Android系统架构
- Android是怎么启动的
- Android 10.0系统启动之init进程
- Android10.0系统启动之Zygote进程
- Android 10.0 系统启动之SystemServer进程
- Android 10.0 系统服务之ActivityMnagerService
- Android10.0系统启动之Launcher(桌面)启动流程
- Android10.0应用进程创建过程以及Zygote的fork流程
- Android 10.0 PackageManagerService（一）工作原理及启动流程
- Android 10.0 PackageManagerService（二）权限扫描
- Android 10.0 PackageManagerService（三）APK扫描
- Android 10.0 PackageManagerService（四）APK安装流程
《日志系统篇》
- Android10.0 日志系统分析(一)-logd、logcat 指令说明、分类和属性
- Android10.0 日志系统分析(二)-logd、logcat架构分析及日志系统初始化
- Android10.0 日志系统分析(三)-logd、logcat读写日志源码分析
- Android10.0 日志系统分析(四)-selinux、kernel日志在logd中的实现
《Binder通信原理》：
- Android10.0 Binder通信原理(一)Binder、HwBinder、VndBinder概要
- Android10.0 Binder通信原理(二)-Binder入门篇
- Android10.0 Binder通信原理(三)-ServiceManager篇
- Android10.0 Binder通信原理(四)-Native-C\C++实例分析
- Android10.0 Binder通信原理(五)-Binder驱动分析
- Android10.0 Binder通信原理(六)-Binder数据如何完成定向打击
- Android10.0 Binder通信原理(七)-Framework binder示例
- Android10.0 Binder通信原理(八)-Framework层分析
- Android10.0 Binder通信原理(九)-AIDL Binder示例
- Android10.0 Binder通信原理(十)-AIDL原理分析-Proxy-Stub设计模式
- Android10.0 Binder通信原理(十一)-Binder总结
《HwBinder通信原理》
- HwBinder入门篇-Android10.0 HwBinder通信原理(一)
- HIDL详解-Android10.0 HwBinder通信原理(二)
- HIDL示例-C++服务创建Client验证-Android10.0 HwBinder通信原理(三)
- HIDL示例-JAVA服务创建-Client验证-Android10.0 HwBinder通信原理(四)
- HwServiceManager篇-Android10.0 HwBinder通信原理(五)
- Native层HIDL服务的注册原理-Android10.0 HwBinder通信原理(六)
- Native层HIDL服务的获取原理-Android10.0 HwBinder通信原理(七)
- JAVA层HIDL服务的注册原理-Android10.0 HwBinder通信原理(八)
- JAVA层HIDL服务的获取原理-Android10.0 HwBinder通信原理（九）
- HwBinder驱动篇-Android10.0 HwBinder通信原理(十)
- HwBinder原理总结-Android10.0 HwBinder通信原理(十一)
上一节，我们学习了JAVA层 HIDL服务的注册获取原理，这一节我们来看看JAVA层HIDL服务的获取原理。
5. 获取服务
JAVA层HIDL服务获取如下图所示：
5.1 获取服务调用栈
5.2 onClick()
[/vendor/ingres/hidl_demo/app/src/main/java/com/android/hidldemo/MainActivity.java]
private IDemo mHidlService;
public void onClick(View v) {
switch (v.getId()) {
case R.id.getHelloBtn:
Log.d(TAG, "start to click");
try {
//1.获取IDemo的hidl服务
mHidlService = IDemo.getService();
if (mHidlService == null) {
Log.e(TAG, "fail to get demo service");
} else {
Log.d(TAG, "success to get demo service");
//2.调用hidl接口
String result = mHidlService.getHelloString("IngresGe");
Log.d(TAG, "HIDL return:" + result);
}
} catch (RemoteException ex) {
Log.e(TAG, "exception, fail to get demo service");
}
break;
}
}5.3 getService()
[/frameworks/base/core/java/android/os/HwBinder.java]
public static native final IHwBinder getService(
String iface,
String serviceName,
boolean retry)
throws RemoteException, NoSuchElementException;这是一个JNI接口，参考上一节《JAVA层HIDL服务的注册原理》中的JNI的转换，在JNI层，进入JHwBinder_native_getService()
5.4 JHwBinder_native_getService
[/frameworks/base/core/jni/android_os_HwBinder.cpp]
static jobject JHwBinder_native_getService(
JNIEnv *env,
jclass /* clazzObj */,
jstring ifaceNameObj,
jstring serviceNameObj,
jboolean retry) {
using ::android::hidl::base::V1_0::IBase;
using ::android::hardware::details::getRawServiceInternal;
std::string ifaceName;
{
ScopedUtfChars str(env, ifaceNameObj);
if (str.c_str() == nullptr) {
return nullptr; // NPE will be pending.
}
ifaceName = str.c_str();
}
std::string serviceName;
{
ScopedUtfChars str(env, serviceNameObj);
if (str.c_str() == nullptr) {
return nullptr; // NPE will be pending.
}
serviceName = str.c_str();
}
//1.根据servicename获取一个IBase对象，通过前文可知，这里是一个 BpHwBase对象
sp ret = getRawServiceInternal(ifaceName, serviceName, retry /* retry */, false /* getStub */);
//2.将IBase对象转换为binder对象，参考[5.8]
sp service = hardware::toBinder(ret);
if (service == NULL) {
signalExceptionForError(env, NAME_NOT_FOUND);
return NULL;
}
LOG(INFO) << "HwBinder: Starting thread pool for getting: " << ifaceName << "/" << serviceName;
::android::hardware::ProcessState::self()->startThreadPool();
//转换hidlservice，使之成为一个Java层HwRemoteBinder对象，参考[5.9]
return JHwRemoteBinder::NewObject(env, service);
} 5.5 getRawServiceInternal()
[/system/libhidl/transport/ServiceManagement.cpp]
sp<::android::hidl::base::V1_0::IBase> getRawServiceInternal(const std::string& descriptor,
const std::string& instance,
bool retry, bool getStub) {
using Transport = ::android::hidl::manager::V1_0::IServiceManager::Transport;
using ::android::hidl::manager::V1_0::IServiceManager;
sp waiter;
sp sm;
Transport transport = Transport::EMPTY;
if (kIsRecovery) {
transport = Transport::PASSTHROUGH;
} else {
//1.拿到HwServiceManager的对象，参考[4.4.3]
sm = defaultServiceManager1_1();
if (sm == nullptr) {
ALOGE("getService: defaultServiceManager() is null");
return nullptr;
}
//2.获取IDemo服务的transport，确认是直通式PASSTHROUGH，还是绑定式：HWBINDER
//transport可以在/vendor/etc/vintf/manifest.xml中查看hwbinder
Return transportRet = sm->getTransport(descriptor, instance);
if (!transportRet.isOk()) {
ALOGE("getService: defaultServiceManager()->getTransport returns %s",
transportRet.description().c_str());
return nullptr;
}
transport = transportRet;
}
const bool vintfHwbinder = (transport == Transport::HWBINDER); //绑定式服务
const bool vintfPassthru = (transport == Transport::PASSTHROUGH); //直通式服务
...
for (int tries = 0; !getStub && (vintfHwbinder || vintfLegacy); tries++) {
if (waiter == nullptr && tries > 0) {
waiter = new Waiter(descriptor, instance, sm);
}
if (waiter != nullptr) {
waiter->reset(); // don't reorder this -- see comments on reset()
}
//3.如果是绑定式的服务，调用 BpHwServiceManager::get()，参考[5.6]
Return> ret = sm->get(descriptor, instance);
if (!ret.isOk()) {
ALOGE("getService: defaultServiceManager()->get returns %s for %s/%s.",
ret.description().c_str(), descriptor.c_str(), instance.c_str());
break;
}
sp base = ret;
if (base != nullptr) {
Return canCastRet =
details::canCastInterface(base.get(), descriptor.c_str(), true /* emitError */);
if (canCastRet.isOk() && canCastRet) {
if (waiter != nullptr) {
waiter->done();
}
return base; // still needs to be wrapped by Bp class.
}
if (!handleCastError(canCastRet, descriptor, instance)) break;
}
// In case of legacy or we were not asked to retry, don't.
if (vintfLegacy || !retry) break;
if (waiter != nullptr) {
ALOGI("getService: Trying again for %s/%s...", descriptor.c_str(), instance.c_str());
waiter->wait(true /* timeout */);
}
}
if (waiter != nullptr) {
waiter->done();
}
if (getStub || vintfPassthru || vintfLegacy) {
//如果是直通式的hidl服务，获取直通式的HwServiceManager对象来获取服务
const sp pm = getPassthroughServiceManager();
if (pm != nullptr) {
sp base = pm->get(descriptor, instance).withDefault(nullptr);
if (!getStub || trebleTestingOverride) {
base = wrapPassthrough(base);
}
return base;
}
}
return nullptr;
} getRawServiceInternal()步骤如下：
1.获取HwServiceManager的代理对象
2.获取IDemo 这个hidl服务的transport，来确认是绑定式服务，还是直通式服务
3.根据transport类型，调用不同的接口来获取服务对象 (我们设计的IDemo是绑定式hidl服务)
5.6 BpHwServiceManager::get()
[/out/soong/.intermediates/system/libhidl/transport/manager/1.2/[email protected]_genc++/gen/android/hidl/manager/1.2/ServiceManagerAll.cpp]
::android::hardware::Return<::android::sp<::android::hidl::base::V1_0::IBase>> BpHwServiceManager::get(const ::android::hardware::hidl_string& fqName, const ::android::hardware::hidl_string& name){
::android::hardware::Return<::android::sp<::android::hidl::base::V1_0::IBase>> _hidl_out = ::android::hidl::manager::V1_0::BpHwServiceManager::_hidl_get(this, this, fqName, name);
return _hidl_out;
}_hidl_get流程如下：
1.准备两个Parcel结构-- _hidl_data，_hidl_reply
2.组装Parcel数据
3.写入RPC头信息"[email protected]::IServiceManager"
4.写入服务名称，如果没有配置的话，name为"default"
5.调用remote的transact，发送 1 /* get */的命令获取hidl服务
7.得到返回的reply数据
8.从reply中读取hidl binder的信息，转换成hidl service，发送出去
::android::hardware::Return<::android::sp<::android::hidl::base::V1_0::IBase>> BpHwServiceManager::_hidl_get(::android::hardware::IInterface *_hidl_this, ::android::hardware::details::HidlInstrumentor *_hidl_this_instrumentor, const ::android::hardware::hidl_string& fqName, const ::android::hardware::hidl_string& name) {
...
::android::hardware::Parcel _hidl_data; //定义一个Parcel的data数据包
::android::hardware::Parcel _hidl_reply;//定义一个Parcel的reply数据包
::android::status_t _hidl_err;
::android::hardware::Status _hidl_status;
::android::sp<::android::hidl::base::V1_0::IBase> _hidl_out_service;
//1.写入RPC头信息"[email protected]::IServiceManager"
_hidl_err = _hidl_data.writeInterfaceToken(BpHwServiceManager::descriptor);
if (_hidl_err != ::android::OK) { goto _hidl_error; }
size_t _hidl_fqName_parent;
//2.写入fqName，如果没有配置的话，name为"default"
_hidl_err = _hidl_data.writeBuffer(&fqName, sizeof(fqName), &_hidl_fqName_parent);
if (_hidl_err != ::android::OK) { goto _hidl_error; }
_hidl_err = ::android::hardware::writeEmbeddedToParcel(
fqName,
&_hidl_data,
_hidl_fqName_parent,
0 /* parentOffset */);
if (_hidl_err != ::android::OK) { goto _hidl_error; }
size_t _hidl_name_parent;
//3.写入hidl 服务name
_hidl_err = _hidl_data.writeBuffer(&name, sizeof(name), &_hidl_name_parent);
if (_hidl_err != ::android::OK) { goto _hidl_error; }
_hidl_err = ::android::hardware::writeEmbeddedToParcel(
name,
&_hidl_data,
_hidl_name_parent,
0 /* parentOffset */);
if (_hidl_err != ::android::OK) { goto _hidl_error; }
//5.调用BpHwBinder::transact()
//_hidl_this 指的是 BpHwServiceManager，通过asBinder转换为传输层面的BpHwBinder对象，其实就是取出BpHwServiceManager的成员变量mRemote的值
_hidl_err = ::android::hardware::IInterface::asBinder(_hidl_this)->transact(1 /* get */, _hidl_data, &_hidl_reply);
if (_hidl_err != ::android::OK) { goto _hidl_error; }
//6.从_hidl_reply读取返回结果
_hidl_err = ::android::hardware::readFromParcel(&_hidl_status, _hidl_reply);
if (_hidl_err != ::android::OK) { goto _hidl_error; }
if (!_hidl_status.isOk()) { return _hidl_status; }
{
//7.从reply的数据中读取，hidl_Binder
::android::sp<::android::hardware::IBinder> _hidl_binder;
_hidl_err = _hidl_reply.readNullableStrongBinder(&_hidl_binder);
if (_hidl_err != ::android::OK) { goto _hidl_error; }
//8.把hidl binder转换成hidl service
_hidl_out_service = ::android::hardware::fromBinder<::android::hidl::base::V1_0::IBase,::android::hidl::base::V1_0::BpHwBase,::android::hidl::base::V1_0::BnHwBase>(_hidl_binder);
}
...
_hidl_status.setFromStatusT(_hidl_err);
//9.返回hidl service对象
return ::android::hardware::Return<::android::sp<::android::hidl::base::V1_0::IBase>>(_hidl_out_service);
_hidl_error:
_hidl_status.setFromStatusT(_hidl_err);
return ::android::hardware::Return<::android::sp<::android::hidl::base::V1_0::IBase>>(_hidl_status);
}根据如下调用栈所示，BpHwBinder::transact()最终会转到BnHwServiceManager::_hidl_get()
5.7 BnHwServiceManager::_hidl_get()
[/out/soong/.intermediates/system/libhidl/transport/manager/1.2/[email protected]_genc++/gen/android/hidl/manager/1.2/ServiceManagerAll.cpp]
::android::status_t BnHwServiceManager::_hidl_get(
::android::hidl::base::V1_0::BnHwBase* _hidl_this,
const ::android::hardware::Parcel &_hidl_data,
::android::hardware::Parcel *_hidl_reply,
TransactCallback _hidl_cb) {
...
::android::status_t _hidl_err = ::android::OK;
if (!_hidl_data.enforceInterface(BnHwServiceManager::Pure::descriptor)) {
_hidl_err = ::android::BAD_TYPE;
return _hidl_err;
}
const ::android::hardware::hidl_string* fqName;
const ::android::hardware::hidl_string* name;
size_t _hidl_fqName_parent;
//1.获取hidl服务的fqName
_hidl_err = _hidl_data.readBuffer(sizeof(*fqName), &_hidl_fqName_parent, reinterpret_cast(&fqName));
if (_hidl_err != ::android::OK) { return _hidl_err; }
_hidl_err = ::android::hardware::readEmbeddedFromParcel(
const_cast<::android::hardware::hidl_string &>(*fqName),
_hidl_data,
_hidl_fqName_parent,
0 /* parentOffset */);
if (_hidl_err != ::android::OK) { return _hidl_err; }
size_t _hidl_name_parent;
//2.获取hidl服务的name
_hidl_err = _hidl_data.readBuffer(sizeof(*name), &_hidl_name_parent, reinterpret_cast(&name));
if (_hidl_err != ::android::OK) { return _hidl_err; }
_hidl_err = ::android::hardware::readEmbeddedFromParcel(
const_cast<::android::hardware::hidl_string &>(*name),
_hidl_data,
_hidl_name_parent,
0 /* parentOffset */);
if (_hidl_err != ::android::OK) { return _hidl_err; }
atrace_begin(ATRACE_TAG_HAL, "HIDL::IServiceManager::get::server");
...
//3.根据hidl服务的fqName和name，从HwServiceManager的hidl service的map中拿到服务对象
::android::sp<::android::hidl::base::V1_0::IBase> _hidl_out_service = static_cast(_hidl_this->getImpl().get())->get(*fqName, *name);
//4.把reply信息写入Parcel
::android::hardware::writeToParcel(::android::hardware::Status::ok(), _hidl_reply);
if (_hidl_out_service == nullptr) {
_hidl_err = _hidl_reply->writeStrongBinder(nullptr);
} else {
//5.把获取的hidl服务转成IBinder对象
::android::sp<::android::hardware::IBinder> _hidl_binder = ::android::hardware::getOrCreateCachedBinder(_hidl_out_service.get());
if (_hidl_binder.get() != nullptr) {
//6.把转换后的IBinder对象，写入reply的Parcel数据中
_hidl_err = _hidl_reply->writeStrongBinder(_hidl_binder);
} else {
_hidl_err = ::android::UNKNOWN_ERROR;
}
}
/* _hidl_err ignored! */
atrace_end(ATRACE_TAG_HAL);
..
//7.通过回调，把reply的Parcel数据给发给client
_hidl_cb(*_hidl_reply);
return _hidl_err;
} _hidl_get流程如下：
1.获取hidl服务的fqName
2.获取hidl服务的name
3.根据hidl服务的fqName和name，从HwServiceManager的hidl service的map中拿到服务对象
4.把reply信息写入Parcel
5.把获取的hidl服务转成IBinder对象
6.把转换后的IBinder对象，写入reply的Parcel数据中
7.通过回调，把reply的Parcel数据给发给client
5.7.1 ServiceManager::get()
[/system/hwservicemanager/ServiceManager.cpp]
Return> ServiceManager::get(const hidl_string& hidlFqName,
const hidl_string& hidlName) {
const std::string fqName = hidlFqName;
const std::string name = hidlName;
if (!mAcl.canGet(fqName, getBinderCallingContext())) {
return nullptr;
}
//1.根据fqName和name找到对应的hidlService
HidlService* hidlService = lookup(fqName, name);
if (hidlService == nullptr) {
tryStartService(fqName, name);
return nullptr;
}
//2.根据hidlService 拿到IBase的对象
sp service = hidlService->getService();
if (service == nullptr) {
tryStartService(fqName, name);
return nullptr;
}
hidlService->guaranteeClient();
hardware::addPostCommandTask([hidlService] {
hidlService->handleClientCallbacks(false /* isCalledOnInterval */);
});
return service;
} 5.7.2 ServiceManager::lookup()
主要是根据fqName和name从 HwServiceManager的服务map：mServiceMap 中找到对应的hidlservice
[/system/hwservicemanager/ServiceManager.cpp]
HidlService* ServiceManager::lookup(const std::string& fqName, const std::string& name) {
//1.根据fqName从 mServiceMap 中 找到一个节点
auto ifaceIt = mServiceMap.find(fqName);
if (ifaceIt == mServiceMap.end()) {
return nullptr;
}
//2.从找到的map节点中，拿到PackageInterfaceMap的内容
PackageInterfaceMap &ifaceMap = ifaceIt->second;
//3.从PackageInterfaceMap中根据name找到hidlService
HidlService *hidlService = ifaceMap.lookup(name);
return hidlService;
}5.7.3 HidlService::getService()
返回hidlservice的mService成员
[/system/hwservicemanager/HidlService.cpp]
sp HidlService::getService() const {
return mService;
} HwServiceManager中hidl服务的管理map：
5.8 toBinder()
toBinder接口将IBase对象转换为binder对象，其实就是从BpHwBase中拿到其成员变量mRemote中的BpHwBinder对象
[/system/libhidl/transport/include/hidl/HidlBinderSupport.h]
sp toBinder(sp iface) {
IType *ifacePtr = iface.get();
return getOrCreateCachedBinder(ifacePtr);
}
sp getOrCreateCachedBinder(::android::hidl::base::V1_0::IBase* ifacePtr) {
if (ifacePtr == nullptr) {
return nullptr;
}
if (ifacePtr->isRemote()) {
using ::android::hidl::base::V1_0::BpHwBase;
//从BpHwBase中拿到其成员变量mRemote中的BpHwBinder对象
BpHwBase* bpBase = static_cast(ifacePtr);
BpHwRefBase* bpRefBase = static_cast(bpBase);
return sp(bpRefBase->remote());
}
std::string descriptor = details::getDescriptor(ifacePtr);
if (descriptor.empty()) {
// interfaceDescriptor fails
return nullptr;
}
// for get + set
std::unique_lock _lock = details::gBnMap->lock();
wp wBnObj = details::gBnMap->getLocked(ifacePtr, nullptr);
sp sBnObj = wBnObj.promote();
if (sBnObj == nullptr) {
auto func = details::getBnConstructorMap().get(descriptor, nullptr);
if (!func) {
// TODO(b/69122224): remove this static variable when prebuilts updated
func = details::gBnConstructorMap->get(descriptor, nullptr);
}
LOG_ALWAYS_FATAL_IF(func == nullptr, "%s gBnConstructorMap returned null for %s", __func__,
descriptor.c_str());
sBnObj = sp(func(static_cast(ifacePtr)));
LOG_ALWAYS_FATAL_IF(sBnObj == nullptr, "%s Bn constructor function returned null for %s",
__func__, descriptor.c_str());
details::gBnMap->setLocked(ifacePtr, static_cast(sBnObj.get()));
}
return sBnObj;
} 5.9 JHwRemoteBinder::NewObject()
在JNI层将调用JHwRemoteBinder::NewObject()函数来创建一个Java层HwRemoteBinder对象，转换hidlservice，使之成为一个Java层HwRemoteBinder对象
[/frameworks/base/core/jni/android_os_HwRemoteBinder.cpp]
jobject JHwRemoteBinder::NewObject(
JNIEnv *env, const sp &binder) {
ScopedLocalRef clazz(env, FindClassOrDie(env, CLASS_PATH));
// XXX Have to look up the constructor here because otherwise that static
// class initializer isn't called and gProxyOffsets.constructID is undefined :(
jmethodID constructID = GetMethodIDOrDie(env, clazz.get(), "", "()V");
jobject obj = env->NewObject(clazz.get(), constructID);
JHwRemoteBinder::GetNativeContext(env, obj)->setBinder(binder);
return obj;
}
5.10 asInterface(android.os.IHwBinder binder)
通过服务查询得到HwRemoteBinder对象，这个只是传输层面的对象而已，需要转换为业务层面的对象，这个是由IXXX.asInterface函数完成
[out/soong/.intermediates/vendor/ingres/interfaces/demo/1.0/vendor.ingres.demo-V1.0-java_gen_java/gen/srcs/vendor/ingres/demo/V1_0/IDemo.java]
/* package private */ static IDemo asInterface(android.os.IHwBinder binder) {
if (binder == null) {
return null;
}
android.os.IHwInterface iface =
binder.queryLocalInterface(kInterfaceName);
if ((iface != null) && (iface instanceof IDemo)) {
return (IDemo)iface;
}
IDemo proxy = new IDemo.Proxy(binder);
try {
for (String descriptor : proxy.interfaceChain()) {
if (descriptor.equals(kInterfaceName)) {
return proxy;
}
}
} catch (android.os.RemoteException e) {
}
return null;
}6. Client-Server接口调用
JAVA层 Client和Server的对象转换如下图所示：
在[4] 和[5]节中，我们知道了服务注册registerService()和获取服务getService()的流程，接下来我们再看一看接口调用是如何进行的。
上面调用的流程，其实和registerService()、getService()类似，都是组装Parcel数据，准备服务端的code，调用HwBinderProxy.transact()发送到服务端。
但是和服务注册不同的是，在服务注册中，Native的HwServiceManager是Server端，服务实体是Client端。接口调用时，服务实体是Server端。
服务端接收到CLient的请求后，根据下图的流程，最终流转到服务实体的onTransact()中，对解析出来的Parcel数据进行处理。
7.代码路径
/system/libhwbinder/BpHwBinder.cpp
/system/libhwbinder/IPCThreadState.cpp
/system/hwservicemanager/HidlService.cpp
/system/hwservicemanager/ServiceManager.cpp
/system/libhidl/transport/ServiceManagement.cpp
/system/libhidl/transport/include/hidl/HidlBinderSupport.h
/frameworks/base/core/jni/android_os_HwBinder.cpp
/frameworks/base/core/java/android/os/HwBinder.java
/frameworks/base/core/jni/android_os_HwRemoteBinder.cpp
/vendor/ingres/hal_demo/java/src/com/android/demo/Server.java
/out/soong/.intermediates/vendor/ingres/interfaces/demo/1.0/vendor.ingres.demo-V1.0-java_gen_java/gen/srcs/vendor/ingres/demo/V1_0/IDemo.java
/out/soong/.intermediates/system/libhidl/transport/base/1.0/[email protected]_genc++/gen/android/hidl/base/1.0/BaseAll.cpp
/out/soong/.intermediates/system/libhidl/transport/manager/1.2/[email protected]_genc++/gen/android/hidl/manager/1.2/ServiceManagerAll.cpp我的微信公众号：IngresGe
