native/android/activity_manager.cpp - platform/frameworks/base - Git at Google

 /*
  * Copyright (C) 2020 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #define LOG_NDEBUG 0
 #define LOG_TAG "AActivityManager"
 #include <utils/Log.h>

 #include <android/activity_manager.h>
 #include <android/app/BnProcessObserver.h>
 #include <android/app/IProcessObserver.h>
 #include <android/binder_status.h>
 #include <android/binder_auto_utils.h>
 #include <android/app/RunningAppProcessInfo.h>
 #include <binder/ActivityManager.h>

 #include <mutex>
 #include <vector>

 namespace android {
 namespace activitymanager {

 // Global instance of ActivityManager, service is obtained only on first use.
 static ActivityManager gAm;
 // String tag used with ActivityManager.
 static const String16& getTag() {
     static String16 tag("libandroid");
     return tag;
 }

 struct UidObserver : public BnUidObserver, public virtual IBinder::DeathRecipient {
     explicit UidObserver(const AActivityManager_onUidImportance& cb,
                          int32_t cutpoint, void* cookie)
           : mCallback(cb), mImportanceCutpoint(cutpoint), mCookie(cookie), mRegistered(false) {}
     bool registerSelf();
     void unregisterSelf();

     // IUidObserver
     void onUidGone(uid_t uid, bool disabled) override;
     void onUidActive(uid_t uid) override;
     void onUidIdle(uid_t uid, bool disabled) override;
     void onUidStateChanged(uid_t uid, int32_t procState, int64_t procStateSeq,
                            int32_t capability) override;
     void onUidProcAdjChanged(uid_t uid, int32_t adj) override;

     // IBinder::DeathRecipient implementation
     void binderDied(const wp<IBinder>& who) override;

     static int32_t procStateToImportance(int32_t procState);
     static int32_t importanceToProcState(int32_t importance);

     AActivityManager_onUidImportance mCallback;
     int32_t mImportanceCutpoint;
     void* mCookie;
     std::mutex mRegisteredLock;
     bool mRegistered GUARDED_BY(mRegisteredLock);
 };

 //static
 int32_t UidObserver::procStateToImportance(int32_t procState) {
     // TODO: remove this after adding Importance to onUidStateChanged callback.
     if (procState == ActivityManager::PROCESS_STATE_NONEXISTENT) {
         return AACTIVITYMANAGER_IMPORTANCE_GONE;
     } else if (procState >= ActivityManager::PROCESS_STATE_HOME) {
         return AACTIVITYMANAGER_IMPORTANCE_CACHED;
     } else if (procState == ActivityManager::PROCESS_STATE_HEAVY_WEIGHT) {
         return AACTIVITYMANAGER_IMPORTANCE_CANT_SAVE_STATE;
     } else if (procState >= ActivityManager::PROCESS_STATE_TOP_SLEEPING) {
         return AACTIVITYMANAGER_IMPORTANCE_TOP_SLEEPING;
     } else if (procState >= ActivityManager::PROCESS_STATE_SERVICE) {
         return AACTIVITYMANAGER_IMPORTANCE_SERVICE;
     } else if (procState >= ActivityManager::PROCESS_STATE_TRANSIENT_BACKGROUND) {
         return AACTIVITYMANAGER_IMPORTANCE_PERCEPTIBLE;
     } else if (procState >= ActivityManager::PROCESS_STATE_IMPORTANT_FOREGROUND) {
         return AACTIVITYMANAGER_IMPORTANCE_VISIBLE;
     } else if (procState >= ActivityManager::PROCESS_STATE_FOREGROUND_SERVICE) {
         return AACTIVITYMANAGER_IMPORTANCE_FOREGROUND_SERVICE;
     } else {
         return AACTIVITYMANAGER_IMPORTANCE_FOREGROUND;
     }
 }

 //static
 int32_t UidObserver::importanceToProcState(int32_t importance) {
     // TODO: remove this after adding Importance to onUidStateChanged callback.
     if (importance == AACTIVITYMANAGER_IMPORTANCE_GONE) {
         return ActivityManager::PROCESS_STATE_NONEXISTENT;
     } else if (importance >= AACTIVITYMANAGER_IMPORTANCE_CACHED) {
         return ActivityManager::PROCESS_STATE_HOME;
     } else if (importance >= AACTIVITYMANAGER_IMPORTANCE_CANT_SAVE_STATE) {
         return ActivityManager::PROCESS_STATE_HEAVY_WEIGHT;
     } else if (importance >= AACTIVITYMANAGER_IMPORTANCE_TOP_SLEEPING) {
         return ActivityManager::PROCESS_STATE_TOP_SLEEPING;
     } else if (importance >= AACTIVITYMANAGER_IMPORTANCE_SERVICE) {
         return ActivityManager::PROCESS_STATE_SERVICE;
     } else if (importance >= AACTIVITYMANAGER_IMPORTANCE_PERCEPTIBLE) {
         return ActivityManager::PROCESS_STATE_TRANSIENT_BACKGROUND;
     } else if (importance >= AACTIVITYMANAGER_IMPORTANCE_VISIBLE) {
         return ActivityManager::PROCESS_STATE_IMPORTANT_FOREGROUND;
     } else if (importance >= AACTIVITYMANAGER_IMPORTANCE_FOREGROUND_SERVICE) {
         return ActivityManager::PROCESS_STATE_FOREGROUND_SERVICE;
     } else {
         return ActivityManager::PROCESS_STATE_TOP;
     }
 }


 void UidObserver::onUidGone(uid_t uid, bool disabled __unused) {
     std::scoped_lock lock{mRegisteredLock};

     if (mRegistered && mCallback) {
         mCallback(uid, AACTIVITYMANAGER_IMPORTANCE_GONE, mCookie);
     }
 }

 void UidObserver::onUidActive(uid_t uid __unused) {}

 void UidObserver::onUidIdle(uid_t uid __unused, bool disabled __unused) {}

 void UidObserver::onUidProcAdjChanged(uid_t uid __unused, int32_t adj __unused) {}

 void UidObserver::onUidStateChanged(uid_t uid, int32_t procState,
                                     int64_t procStateSeq __unused,
                                     int32_t capability __unused) {
     std::scoped_lock lock{mRegisteredLock};

     if (mRegistered && mCallback) {
         mCallback(uid, procStateToImportance(procState), mCookie);
     }
 }

 void UidObserver::binderDied(const wp<IBinder>& /*who*/) {
     // ActivityManager is dead, try to re-register.
     {
         std::scoped_lock lock{mRegisteredLock};
         // If client already unregistered, don't try to re-register.
         if (!mRegistered) {
             return;
         }
         // Clear mRegistered to re-register.
         mRegistered = false;
     }
     registerSelf();
 }

 bool UidObserver::registerSelf() {
     std::scoped_lock lock{mRegisteredLock};
     if (mRegistered) {
         return true;
     }

     status_t res = gAm.linkToDeath(this);
     if (res != OK) {
         ALOGE("UidObserver: Failed to linkToDeath with ActivityManager (err %d)", res);
         return false;
     }

     // TODO: it seems only way to get all changes is to set cutoff to PROCESS_STATE_UNKNOWN.
     // But there is no equivalent of PROCESS_STATE_UNKNOWN in the UidImportance.
     // If mImportanceCutpoint is < 0, use PROCESS_STATE_UNKNOWN instead.
     res = gAm.registerUidObserver(
             this,
             ActivityManager::UID_OBSERVER_GONE | ActivityManager::UID_OBSERVER_PROCSTATE,
             (mImportanceCutpoint < 0) ? ActivityManager::PROCESS_STATE_UNKNOWN
                                       : importanceToProcState(mImportanceCutpoint),
             getTag());
     if (res != OK) {
         ALOGE("UidObserver: Failed to register with ActivityManager (err %d)", res);
         gAm.unlinkToDeath(this);
         return false;
     }

     mRegistered = true;
     ALOGV("UidObserver: Registered with ActivityManager");
     return true;
 }

 void UidObserver::unregisterSelf() {
     std::scoped_lock lock{mRegisteredLock};

     if (mRegistered) {
         gAm.unregisterUidObserver(this);
         gAm.unlinkToDeath(this);
         mRegistered = false;
     }

     ALOGV("UidObserver: Unregistered with ActivityManager");
 }

 class ProcessObserver : public app::BnProcessObserver {
 public:
     explicit ProcessObserver(void* cookie)
           : mOnProcessStarted(nullptr),
             mOnForegroundActivitiesChanged(nullptr),
             mOnForegroundServicesChanged(nullptr),
             mOnProcessDied(nullptr),
             mCookie(cookie) {}

     void setOnProcessStarted(AActivityManager_onProcessStarted cb) { mOnProcessStarted = cb; }
     void setOnForegroundActivitiesChanged(AActivityManager_onForegroundActivitiesChanged cb) {
         mOnForegroundActivitiesChanged = cb;
     }
     void setOnForegroundServicesChanged(AActivityManager_onForegroundServicesChanged cb) {
         mOnForegroundServicesChanged = cb;
     }
     void setOnProcessDied(AActivityManager_onProcessDied cb) { mOnProcessDied = cb; }

     bool hasCallbacks() const {
         return mOnProcessStarted || mOnForegroundActivitiesChanged ||
                mOnForegroundServicesChanged || mOnProcessDied;
     }

     binder::Status onProcessStarted(int pid, int processUid, int packageUid,
                                     const std::string& packageName,
                                     const std::string& processName) override {
         if (mOnProcessStarted) {
             mOnProcessStarted(pid, processUid, packageUid, packageName.c_str(),
                               processName.c_str(), mCookie);
         }
         return binder::Status::ok();
     }

     binder::Status onForegroundActivitiesChanged(int pid, int uid,
                                                  bool foregroundActivities) override {
         if (mOnForegroundActivitiesChanged) {
             const AActivityManager_ForegroundActivitiesState state =
                     foregroundActivities
                             ? AACTIVITYMANAGER_HAS_FOREGROUND_ACTIVITIES
                             : AACTIVITYMANAGER_NO_FOREGROUND_ACTIVITIES;
             mOnForegroundActivitiesChanged(pid, uid, state, mCookie);
         }
         return binder::Status::ok();
     }

     binder::Status onForegroundServicesChanged(int pid, int uid, int32_t serviceTypes) override {
         if (mOnForegroundServicesChanged) {
             mOnForegroundServicesChanged(pid, uid, serviceTypes, mCookie);
         }
         return binder::Status::ok();
     }

     binder::Status onProcessDied(int pid, int uid) override {
         if (mOnProcessDied) {
             mOnProcessDied(pid, uid, mCookie);
         }
         return binder::Status::ok();
     }

 private:
     AActivityManager_onProcessStarted mOnProcessStarted;
     AActivityManager_onForegroundActivitiesChanged mOnForegroundActivitiesChanged;
     AActivityManager_onForegroundServicesChanged mOnForegroundServicesChanged;
     AActivityManager_onProcessDied mOnProcessDied;
     void* mCookie;
 };

 } // activitymanager
 } // android

 using namespace android;
 using namespace activitymanager;

 struct AActivityManager_UidImportanceListener : public UidObserver {
 };

 AActivityManager_UidImportanceListener* AActivityManager_addUidImportanceListener(
         AActivityManager_onUidImportance onUidImportance, int32_t importanceCutpoint, void* cookie) {
     sp<UidObserver> observer(new UidObserver(onUidImportance, importanceCutpoint, cookie));
     if (observer == nullptr || !observer->registerSelf()) {
         return nullptr;
     }
     observer->incStrong((void *)AActivityManager_addUidImportanceListener);
     return static_cast<AActivityManager_UidImportanceListener*>(observer.get());
 }

 void AActivityManager_removeUidImportanceListener(
         AActivityManager_UidImportanceListener* listener) {
     if (listener != nullptr) {
         UidObserver* observer = static_cast<UidObserver*>(listener);
         observer->unregisterSelf();
         observer->decStrong((void *)AActivityManager_addUidImportanceListener);
     }
 }

 struct AActivityManager_ProcessObserver {
     sp<ProcessObserver> observer;
     bool registered = false;
 };

 AActivityManager_ProcessObserver* AActivityManager_createProcessObserver(void* cookie) {
     auto handle = new AActivityManager_ProcessObserver();
     if (!handle) {
         return nullptr;
     }
     handle->observer = sp<ProcessObserver>::make(cookie);
     if (handle->observer == nullptr) {
         delete handle;
         return nullptr;
     }
     return handle;
 }

 void AActivityManager_destroyProcessObserver(AActivityManager_ProcessObserver* observer) {
     if (observer == nullptr) {
         return;
     }
     if (observer->registered) {
         gAm.unregisterProcessObserver(observer->observer);
     }
     delete observer;
 }

 void AActivityManager_ProcessObserver_setOnProcessStarted(
         AActivityManager_ProcessObserver* observer, AActivityManager_onProcessStarted callback) {
     if (observer && observer->observer) {
         observer->observer->setOnProcessStarted(callback);
     }
 }

 void AActivityManager_ProcessObserver_setOnForegroundActivitiesChanged(
         AActivityManager_ProcessObserver* observer,
         AActivityManager_onForegroundActivitiesChanged callback) {
     if (observer && observer->observer) {
         observer->observer->setOnForegroundActivitiesChanged(callback);
     }
 }

 void AActivityManager_ProcessObserver_setOnForegroundServicesChanged(
         AActivityManager_ProcessObserver* observer,
         AActivityManager_onForegroundServicesChanged callback) {
     if (observer && observer->observer) {
         observer->observer->setOnForegroundServicesChanged(callback);
     }
 }

 void AActivityManager_ProcessObserver_setOnProcessDied(
         AActivityManager_ProcessObserver* observer, AActivityManager_onProcessDied callback) {
     if (observer && observer->observer) {
         observer->observer->setOnProcessDied(callback);
     }
 }

 binder_status_t AActivityManager_registerProcessObserver(
         AActivityManager_ProcessObserver* observer) {
     if (observer == nullptr || observer->observer == nullptr) {
         return STATUS_BAD_VALUE;
     }
     if (observer->registered) {
         return STATUS_INVALID_OPERATION;
     }
     if (!observer->observer->hasCallbacks()) {
         return STATUS_BAD_VALUE;
     }

     status_t status = gAm.registerProcessObserver(observer->observer);
     if (status != OK) {
         ALOGE("ProcessObserver: Failed to register with ActivityManager (err %d)", status);
         return ndk::ScopedAStatus::fromStatus(status).getStatus();
     }

     observer->registered = true;
     return STATUS_OK;
 }

 void AActivityManager_unregisterProcessObserver(AActivityManager_ProcessObserver* observer) {
     if (observer == nullptr || !observer->registered) {
         return;
     }
     gAm.unregisterProcessObserver(observer->observer);
     observer->registered = false;
 }

 struct ARunningAppProcessInfo {
     pid_t pid;
     uid_t uid;
     std::string processName;
     std::vector<std::string> pkgList;
     int32_t importance;
     std::vector<const char*> pkgListCStr;
 };

 struct ARunningAppProcessInfoList {
     std::vector<ARunningAppProcessInfo> list;
 };

 binder_status_t AActivityManager_getRunningAppProcesses(
         ARunningAppProcessInfoList** outProcessInfoList) {
     if (outProcessInfoList == nullptr) {
         return STATUS_BAD_VALUE;
     }

     std::vector<app::RunningAppProcessInfo> processes;
     status_t status = gAm.getRunningAppProcesses(&processes);
     if (status != OK) {
         return ndk::ScopedAStatus::fromStatus(status).getStatus();
     }

     auto* list = new ARunningAppProcessInfoList();
     list->list.reserve(processes.size());

     for (const auto& p : processes) {
         ARunningAppProcessInfo info;
         info.pid = p.pid;
         info.uid = p.uid;
         info.processName = p.processName;
         if (p.pkgList.has_value()) {
             for (const auto& pkg : p.pkgList.value()) {
                 if (pkg.has_value()) {
                     info.pkgList.push_back(pkg.value());
                 }
             }
         }
         info.importance = p.importance;

         info.pkgListCStr.reserve(info.pkgList.size());
         for (const auto& pkg : info.pkgList) {
             info.pkgListCStr.push_back(pkg.c_str());
         }
         list->list.emplace_back(std::move(info));
     }

     *outProcessInfoList = list;
     return STATUS_OK;
 }

 void AActivityManager_RunningAppProcessInfoList_destroy(const ARunningAppProcessInfoList* list) {
     delete list;
 }

 size_t AActivityManager_RunningAppProcessInfoList_getSize(const ARunningAppProcessInfoList* list) {
     return list->list.size();
 }

 const ARunningAppProcessInfo* AActivityManager_RunningAppProcessInfoList_get(
         const ARunningAppProcessInfoList* list, size_t index) {
     if (index >= list->list.size()) {
         return nullptr;
     }
     return &list->list[index];
 }

 bool AActivityManager_isUidActive(uid_t uid) {
     return gAm.isUidActive(uid, getTag());
 }

 int32_t AActivityManager_getUidImportance(uid_t uid) {
     return UidObserver::procStateToImportance(gAm.getUidProcessState(uid, getTag()));
 }

 pid_t ARunningAppProcessInfo_getPid(const ARunningAppProcessInfo* info) { return info->pid; }

 uid_t ARunningAppProcessInfo_getUid(const ARunningAppProcessInfo* info) { return info->uid; }

 const char* ARunningAppProcessInfo_getProcessName(const ARunningAppProcessInfo* info) {
     return info->processName.c_str();
 }

 const char* const* ARunningAppProcessInfo_getPackageList(const ARunningAppProcessInfo* info,
                                                          size_t* outNumPackages) {
     *outNumPackages = info->pkgListCStr.size();
     if (info->pkgListCStr.empty()) {
         return nullptr;
     }
     return info->pkgListCStr.data();
 }

 int32_t ARunningAppProcessInfo_getImportance(const ARunningAppProcessInfo* info) {
     return info->importance;
 }
	/*
	* Copyright (C) 2020 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#define LOG_NDEBUG 0
	#define LOG_TAG "AActivityManager"
	#include <utils/Log.h>

	#include <android/activity_manager.h>
	#include <android/app/BnProcessObserver.h>
	#include <android/app/IProcessObserver.h>
	#include <android/binder_status.h>
	#include <android/binder_auto_utils.h>
	#include <android/app/RunningAppProcessInfo.h>
	#include <binder/ActivityManager.h>

	#include <mutex>
	#include <vector>

	namespace android {
	namespace activitymanager {

	// Global instance of ActivityManager, service is obtained only on first use.
	static ActivityManager gAm;
	// String tag used with ActivityManager.
	static const String16& getTag() {
	static String16 tag("libandroid");
	return tag;
	}

	struct UidObserver : public BnUidObserver, public virtual IBinder::DeathRecipient {
	explicit UidObserver(const AActivityManager_onUidImportance& cb,
	int32_t cutpoint, void* cookie)
	: mCallback(cb), mImportanceCutpoint(cutpoint), mCookie(cookie), mRegistered(false) {}
	bool registerSelf();
	void unregisterSelf();

	// IUidObserver
	void onUidGone(uid_t uid, bool disabled) override;
	void onUidActive(uid_t uid) override;
	void onUidIdle(uid_t uid, bool disabled) override;
	void onUidStateChanged(uid_t uid, int32_t procState, int64_t procStateSeq,
	int32_t capability) override;
	void onUidProcAdjChanged(uid_t uid, int32_t adj) override;

	// IBinder::DeathRecipient implementation
	void binderDied(const wp<IBinder>& who) override;

	static int32_t procStateToImportance(int32_t procState);
	static int32_t importanceToProcState(int32_t importance);

	AActivityManager_onUidImportance mCallback;
	int32_t mImportanceCutpoint;
	void* mCookie;
	std::mutex mRegisteredLock;
	bool mRegistered GUARDED_BY(mRegisteredLock);
	};

	//static
	int32_t UidObserver::procStateToImportance(int32_t procState) {
	// TODO: remove this after adding Importance to onUidStateChanged callback.
	if (procState == ActivityManager::PROCESS_STATE_NONEXISTENT) {
	return AACTIVITYMANAGER_IMPORTANCE_GONE;
	} else if (procState >= ActivityManager::PROCESS_STATE_HOME) {
	return AACTIVITYMANAGER_IMPORTANCE_CACHED;
	} else if (procState == ActivityManager::PROCESS_STATE_HEAVY_WEIGHT) {
	return AACTIVITYMANAGER_IMPORTANCE_CANT_SAVE_STATE;
	} else if (procState >= ActivityManager::PROCESS_STATE_TOP_SLEEPING) {
	return AACTIVITYMANAGER_IMPORTANCE_TOP_SLEEPING;
	} else if (procState >= ActivityManager::PROCESS_STATE_SERVICE) {
	return AACTIVITYMANAGER_IMPORTANCE_SERVICE;
	} else if (procState >= ActivityManager::PROCESS_STATE_TRANSIENT_BACKGROUND) {
	return AACTIVITYMANAGER_IMPORTANCE_PERCEPTIBLE;
	} else if (procState >= ActivityManager::PROCESS_STATE_IMPORTANT_FOREGROUND) {
	return AACTIVITYMANAGER_IMPORTANCE_VISIBLE;
	} else if (procState >= ActivityManager::PROCESS_STATE_FOREGROUND_SERVICE) {
	return AACTIVITYMANAGER_IMPORTANCE_FOREGROUND_SERVICE;
	} else {
	return AACTIVITYMANAGER_IMPORTANCE_FOREGROUND;
	}
	}

	//static
	int32_t UidObserver::importanceToProcState(int32_t importance) {
	// TODO: remove this after adding Importance to onUidStateChanged callback.
	if (importance == AACTIVITYMANAGER_IMPORTANCE_GONE) {
	return ActivityManager::PROCESS_STATE_NONEXISTENT;
	} else if (importance >= AACTIVITYMANAGER_IMPORTANCE_CACHED) {
	return ActivityManager::PROCESS_STATE_HOME;
	} else if (importance >= AACTIVITYMANAGER_IMPORTANCE_CANT_SAVE_STATE) {
	return ActivityManager::PROCESS_STATE_HEAVY_WEIGHT;
	} else if (importance >= AACTIVITYMANAGER_IMPORTANCE_TOP_SLEEPING) {
	return ActivityManager::PROCESS_STATE_TOP_SLEEPING;
	} else if (importance >= AACTIVITYMANAGER_IMPORTANCE_SERVICE) {
	return ActivityManager::PROCESS_STATE_SERVICE;
	} else if (importance >= AACTIVITYMANAGER_IMPORTANCE_PERCEPTIBLE) {
	return ActivityManager::PROCESS_STATE_TRANSIENT_BACKGROUND;
	} else if (importance >= AACTIVITYMANAGER_IMPORTANCE_VISIBLE) {
	return ActivityManager::PROCESS_STATE_IMPORTANT_FOREGROUND;
	} else if (importance >= AACTIVITYMANAGER_IMPORTANCE_FOREGROUND_SERVICE) {
	return ActivityManager::PROCESS_STATE_FOREGROUND_SERVICE;
	} else {
	return ActivityManager::PROCESS_STATE_TOP;
	}
	}


	void UidObserver::onUidGone(uid_t uid, bool disabled __unused) {
	std::scoped_lock lock{mRegisteredLock};

	if (mRegistered && mCallback) {
	mCallback(uid, AACTIVITYMANAGER_IMPORTANCE_GONE, mCookie);
	}
	}

	void UidObserver::onUidActive(uid_t uid __unused) {}

	void UidObserver::onUidIdle(uid_t uid __unused, bool disabled __unused) {}

	void UidObserver::onUidProcAdjChanged(uid_t uid __unused, int32_t adj __unused) {}

	void UidObserver::onUidStateChanged(uid_t uid, int32_t procState,
	int64_t procStateSeq __unused,
	int32_t capability __unused) {
	std::scoped_lock lock{mRegisteredLock};

	if (mRegistered && mCallback) {
	mCallback(uid, procStateToImportance(procState), mCookie);
	}
	}

	void UidObserver::binderDied(const wp<IBinder>& /who/) {
	// ActivityManager is dead, try to re-register.
	{
	std::scoped_lock lock{mRegisteredLock};
	// If client already unregistered, don't try to re-register.
	if (!mRegistered) {
	return;
	}
	// Clear mRegistered to re-register.
	mRegistered = false;
	}
	registerSelf();
	}

	bool UidObserver::registerSelf() {
	std::scoped_lock lock{mRegisteredLock};
	if (mRegistered) {
	return true;
	}

	status_t res = gAm.linkToDeath(this);
	if (res != OK) {
	ALOGE("UidObserver: Failed to linkToDeath with ActivityManager (err %d)", res);
	return false;
	}

	// TODO: it seems only way to get all changes is to set cutoff to PROCESS_STATE_UNKNOWN.
	// But there is no equivalent of PROCESS_STATE_UNKNOWN in the UidImportance.
	// If mImportanceCutpoint is < 0, use PROCESS_STATE_UNKNOWN instead.
	res = gAm.registerUidObserver(
	this,
	ActivityManager::UID_OBSERVER_GONE \| ActivityManager::UID_OBSERVER_PROCSTATE,
	(mImportanceCutpoint < 0) ? ActivityManager::PROCESS_STATE_UNKNOWN
	: importanceToProcState(mImportanceCutpoint),
	getTag());
	if (res != OK) {
	ALOGE("UidObserver: Failed to register with ActivityManager (err %d)", res);
	gAm.unlinkToDeath(this);
	return false;
	}

	mRegistered = true;
	ALOGV("UidObserver: Registered with ActivityManager");
	return true;
	}

	void UidObserver::unregisterSelf() {
	std::scoped_lock lock{mRegisteredLock};

	if (mRegistered) {
	gAm.unregisterUidObserver(this);
	gAm.unlinkToDeath(this);
	mRegistered = false;
	}

	ALOGV("UidObserver: Unregistered with ActivityManager");
	}

	class ProcessObserver : public app::BnProcessObserver {
	public:
	explicit ProcessObserver(void* cookie)
	: mOnProcessStarted(nullptr),
	mOnForegroundActivitiesChanged(nullptr),
	mOnForegroundServicesChanged(nullptr),
	mOnProcessDied(nullptr),
	mCookie(cookie) {}

	void setOnProcessStarted(AActivityManager_onProcessStarted cb) { mOnProcessStarted = cb; }
	void setOnForegroundActivitiesChanged(AActivityManager_onForegroundActivitiesChanged cb) {
	mOnForegroundActivitiesChanged = cb;
	}
	void setOnForegroundServicesChanged(AActivityManager_onForegroundServicesChanged cb) {
	mOnForegroundServicesChanged = cb;
	}
	void setOnProcessDied(AActivityManager_onProcessDied cb) { mOnProcessDied = cb; }

	bool hasCallbacks() const {
	return mOnProcessStarted \|\| mOnForegroundActivitiesChanged \|\|
	mOnForegroundServicesChanged \|\| mOnProcessDied;
	}

	binder::Status onProcessStarted(int pid, int processUid, int packageUid,
	const std::string& packageName,
	const std::string& processName) override {
	if (mOnProcessStarted) {
	mOnProcessStarted(pid, processUid, packageUid, packageName.c_str(),
	processName.c_str(), mCookie);
	}
	return binder::Status::ok();
	}

	binder::Status onForegroundActivitiesChanged(int pid, int uid,
	bool foregroundActivities) override {
	if (mOnForegroundActivitiesChanged) {
	const AActivityManager_ForegroundActivitiesState state =
	foregroundActivities
	? AACTIVITYMANAGER_HAS_FOREGROUND_ACTIVITIES
	: AACTIVITYMANAGER_NO_FOREGROUND_ACTIVITIES;
	mOnForegroundActivitiesChanged(pid, uid, state, mCookie);
	}
	return binder::Status::ok();
	}

	binder::Status onForegroundServicesChanged(int pid, int uid, int32_t serviceTypes) override {
	if (mOnForegroundServicesChanged) {
	mOnForegroundServicesChanged(pid, uid, serviceTypes, mCookie);
	}
	return binder::Status::ok();
	}

	binder::Status onProcessDied(int pid, int uid) override {
	if (mOnProcessDied) {
	mOnProcessDied(pid, uid, mCookie);
	}
	return binder::Status::ok();
	}

	private:
	AActivityManager_onProcessStarted mOnProcessStarted;
	AActivityManager_onForegroundActivitiesChanged mOnForegroundActivitiesChanged;
	AActivityManager_onForegroundServicesChanged mOnForegroundServicesChanged;
	AActivityManager_onProcessDied mOnProcessDied;
	void* mCookie;
	};

	} // activitymanager
	} // android

	using namespace android;
	using namespace activitymanager;

	struct AActivityManager_UidImportanceListener : public UidObserver {
	};

	AActivityManager_UidImportanceListener* AActivityManager_addUidImportanceListener(
	AActivityManager_onUidImportance onUidImportance, int32_t importanceCutpoint, void* cookie) {
	sp<UidObserver> observer(new UidObserver(onUidImportance, importanceCutpoint, cookie));
	if (observer == nullptr \|\| !observer->registerSelf()) {
	return nullptr;
	}
	observer->incStrong((void *)AActivityManager_addUidImportanceListener);
	return static_cast<AActivityManager_UidImportanceListener*>(observer.get());
	}

	void AActivityManager_removeUidImportanceListener(
	AActivityManager_UidImportanceListener* listener) {
	if (listener != nullptr) {
	UidObserver* observer = static_cast<UidObserver*>(listener);
	observer->unregisterSelf();
	observer->decStrong((void *)AActivityManager_addUidImportanceListener);
	}
	}

	struct AActivityManager_ProcessObserver {
	sp<ProcessObserver> observer;
	bool registered = false;
	};

	AActivityManager_ProcessObserver* AActivityManager_createProcessObserver(void* cookie) {
	auto handle = new AActivityManager_ProcessObserver();
	if (!handle) {
	return nullptr;
	}
	handle->observer = sp<ProcessObserver>::make(cookie);
	if (handle->observer == nullptr) {
	delete handle;
	return nullptr;
	}
	return handle;
	}

	void AActivityManager_destroyProcessObserver(AActivityManager_ProcessObserver* observer) {
	if (observer == nullptr) {
	return;
	}
	if (observer->registered) {
	gAm.unregisterProcessObserver(observer->observer);
	}
	delete observer;
	}

	void AActivityManager_ProcessObserver_setOnProcessStarted(
	AActivityManager_ProcessObserver* observer, AActivityManager_onProcessStarted callback) {
	if (observer && observer->observer) {
	observer->observer->setOnProcessStarted(callback);
	}
	}

	void AActivityManager_ProcessObserver_setOnForegroundActivitiesChanged(
	AActivityManager_ProcessObserver* observer,
	AActivityManager_onForegroundActivitiesChanged callback) {
	if (observer && observer->observer) {
	observer->observer->setOnForegroundActivitiesChanged(callback);
	}
	}

	void AActivityManager_ProcessObserver_setOnForegroundServicesChanged(
	AActivityManager_ProcessObserver* observer,
	AActivityManager_onForegroundServicesChanged callback) {
	if (observer && observer->observer) {
	observer->observer->setOnForegroundServicesChanged(callback);
	}
	}

	void AActivityManager_ProcessObserver_setOnProcessDied(
	AActivityManager_ProcessObserver* observer, AActivityManager_onProcessDied callback) {
	if (observer && observer->observer) {
	observer->observer->setOnProcessDied(callback);
	}
	}

	binder_status_t AActivityManager_registerProcessObserver(
	AActivityManager_ProcessObserver* observer) {
	if (observer == nullptr \|\| observer->observer == nullptr) {
	return STATUS_BAD_VALUE;
	}
	if (observer->registered) {
	return STATUS_INVALID_OPERATION;
	}
	if (!observer->observer->hasCallbacks()) {
	return STATUS_BAD_VALUE;
	}

	status_t status = gAm.registerProcessObserver(observer->observer);
	if (status != OK) {
	ALOGE("ProcessObserver: Failed to register with ActivityManager (err %d)", status);
	return ndk::ScopedAStatus::fromStatus(status).getStatus();
	}

	observer->registered = true;
	return STATUS_OK;
	}

	void AActivityManager_unregisterProcessObserver(AActivityManager_ProcessObserver* observer) {
	if (observer == nullptr \|\| !observer->registered) {
	return;
	}
	gAm.unregisterProcessObserver(observer->observer);
	observer->registered = false;
	}

	struct ARunningAppProcessInfo {
	pid_t pid;
	uid_t uid;
	std::string processName;
	std::vector<std::string> pkgList;
	int32_t importance;
	std::vector<const char*> pkgListCStr;
	};

	struct ARunningAppProcessInfoList {
	std::vector<ARunningAppProcessInfo> list;
	};

	binder_status_t AActivityManager_getRunningAppProcesses(
	ARunningAppProcessInfoList** outProcessInfoList) {
	if (outProcessInfoList == nullptr) {
	return STATUS_BAD_VALUE;
	}

	std::vector<app::RunningAppProcessInfo> processes;
	status_t status = gAm.getRunningAppProcesses(&processes);
	if (status != OK) {
	return ndk::ScopedAStatus::fromStatus(status).getStatus();
	}

	auto* list = new ARunningAppProcessInfoList();
	list->list.reserve(processes.size());

	for (const auto& p : processes) {
	ARunningAppProcessInfo info;
	info.pid = p.pid;
	info.uid = p.uid;
	info.processName = p.processName;
	if (p.pkgList.has_value()) {
	for (const auto& pkg : p.pkgList.value()) {
	if (pkg.has_value()) {
	info.pkgList.push_back(pkg.value());
	}
	}
	}
	info.importance = p.importance;

	info.pkgListCStr.reserve(info.pkgList.size());
	for (const auto& pkg : info.pkgList) {
	info.pkgListCStr.push_back(pkg.c_str());
	}
	list->list.emplace_back(std::move(info));
	}

	*outProcessInfoList = list;
	return STATUS_OK;
	}

	void AActivityManager_RunningAppProcessInfoList_destroy(const ARunningAppProcessInfoList* list) {
	delete list;
	}

	size_t AActivityManager_RunningAppProcessInfoList_getSize(const ARunningAppProcessInfoList* list) {
	return list->list.size();
	}

	const ARunningAppProcessInfo* AActivityManager_RunningAppProcessInfoList_get(
	const ARunningAppProcessInfoList* list, size_t index) {
	if (index >= list->list.size()) {
	return nullptr;
	}
	return &list->list[index];
	}

	bool AActivityManager_isUidActive(uid_t uid) {
	return gAm.isUidActive(uid, getTag());
	}

	int32_t AActivityManager_getUidImportance(uid_t uid) {
	return UidObserver::procStateToImportance(gAm.getUidProcessState(uid, getTag()));
	}

	pid_t ARunningAppProcessInfo_getPid(const ARunningAppProcessInfo* info) { return info->pid; }

	uid_t ARunningAppProcessInfo_getUid(const ARunningAppProcessInfo* info) { return info->uid; }

	const char* ARunningAppProcessInfo_getProcessName(const ARunningAppProcessInfo* info) {
	return info->processName.c_str();
	}

	const char* const* ARunningAppProcessInfo_getPackageList(const ARunningAppProcessInfo* info,
	size_t* outNumPackages) {
	*outNumPackages = info->pkgListCStr.size();
	if (info->pkgListCStr.empty()) {
	return nullptr;
	}
	return info->pkgListCStr.data();
	}

	int32_t ARunningAppProcessInfo_getImportance(const ARunningAppProcessInfo* info) {
	return info->importance;
	}