订阅应用冻屏事件(C/C++)
简介
本文介绍如何使用HiAppEvent提供的C/C++接口订阅应用冻屏事件。接口的详细使用说明(参数限制、取值范围等)请参考hiappevent.h。
接口说明
| 接口名 | 描述 |
|---|---|
| int OH_HiAppEvent_AddWatcher(HiAppEvent_Watcher *watcher) | 添加应用事件观察者,以添加对应用事件的订阅。 |
| int OH_HiAppEvent_RemoveWatcher(HiAppEvent_Watcher *watcher) | 移除应用事件观察者,以移除对应用事件的订阅。 |
开发步骤
添加事件观察者
以订阅应用冻屏事件为例,说明开发步骤。
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获取该示例工程依赖的jsoncpp文件,从三方开源库jsoncpp代码仓下载源码的压缩包,并按照README的Amalgamated source中介绍的操作步骤得到jsoncpp.cpp、json.h和json-forwards.h三个文件。
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新建Native C++工程,并将jsoncpp导入到新建工程内,目录结构如下。
entry:src:main:cpp:json:- json.h- json-forwards.htypes:libentry:- index.d.ts- CMakeLists.txt- jsoncpp.cpp- napi_init.cppets:entryability:- EntryAbility.etspages:- Index.ets -
编辑“CMakeLists.txt”文件,添加源文件及动态库。
# 新增jsoncpp.cpp(解析订阅事件中的json字符串)源文件add_library(entry SHARED napi_init.cpp jsoncpp.cpp)# 新增动态库依赖libhiappevent_ndk.z.so和libhilog_ndk.z.so(日志输出)target_link_libraries(entry PUBLIC libace_napi.z.so libhilog_ndk.z.so libhiappevent_ndk.z.so) -
编辑“napi_init.cpp”文件,导入依赖的文件,并定义LOG_TAG。
#include "napi/native_api.h"#include "json/json.h"#include "hilog/log.h"#include "hiappevent/hiappevent.h"#undef LOG_TAG#define LOG_TAG "testTag" -
订阅系统事件。
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onReceive类型观察者
编辑“napi_init.cpp”文件,定义onReceive类型观察者相关方法:
// 定义一个变量,用来缓存创建的观察者的指针。static HiAppEvent_Watcher *systemEventWatcher;static void OnReceive(const char *domain, const struct HiAppEvent_AppEventGroup *appEventGroups, uint32_t groupLen) {for (int i = 0; i < groupLen; ++i) {for (int j = 0; j < appEventGroups[i].infoLen; ++j) {OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.domain=%{public}s", appEventGroups[i].appEventInfos[j].domain);OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.name=%{public}s", appEventGroups[i].appEventInfos[j].name);OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.eventType=%{public}d", appEventGroups[i].appEventInfos[j].type);if (strcmp(appEventGroups[i].appEventInfos[j].domain, DOMAIN_OS) == 0 &&strcmp(appEventGroups[i].appEventInfos[j].name, EVENT_APP_FREEZE) == 0) {Json::Value params;Json::Reader reader(Json::Features::strictMode());Json::FastWriter writer;if (reader.parse(appEventGroups[i].appEventInfos[j].params, params)) {auto time = params["time"].asInt64();auto foreground = params["foreground"].asBool();auto bundleVersion = params["bundle_version"].asString();auto bundleName = params["bundle_name"].asString();auto processName = params["process_name"].asString();auto pid = params["pid"].asInt();auto uid = params["uid"].asInt();auto uuid = params["uuid"].asString();auto exception = writer.write(params["exception"]);auto hilogSize = params["hilog"].size();auto handleSize = params["event_handler"].size();auto handleSize3s = params["event_handler_size_3s"].asString();auto handleSize6s = params["event_handler_size_6s"].asString();auto peerBindSize = params["peer_binder"].size();auto threadSize = params["threads"].size();auto memory = writer.write(params["memory"]);auto externalLog = writer.write(params["external_log"]);auto logOverLimit = params["log_over_limit"].asBool();OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.time=%{public}lld", time);OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.foreground=%{public}d", foreground);OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.bundle_version=%{public}s", bundleVersion.c_str());OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.bundle_name=%{public}s", bundleName.c_str());OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.process_name=%{public}s", processName.c_str());OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.pid=%{public}d", pid);OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.uid=%{public}d", uid);OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.uuid=%{public}s", uuid.c_str());OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.exception=%{public}s", exception.c_str());OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.hilog.size=%{public}d", hilogSize);OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.event_handler.size=%{public}d", handleSize);OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.event_handler_3s.size=%{public}s", handleSize3s.c_str());OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.event_handler_6s.size=%{public}s", handleSize6s.c_str());OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.peer_binder.size=%{public}d", peerBindSize);OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.threads.size=%{public}d", threadSize);OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.memory=%{public}s", memory.c_str());OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.external_log=%{public}s", externalLog.c_str());OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.log_over_limit=%{public}d", logOverLimit);}}}}}static napi_value RegisterWatcher(napi_env env, napi_callback_info info) {// 开发者自定义观察者名称,系统根据不同的名称来识别不同的观察者。systemEventWatcher = OH_HiAppEvent_CreateWatcher("onReceiverWatcher");// 设置订阅的事件为EVENT_APP_FREEZE。const char *names[] = {EVENT_APP_FREEZE};// 开发者订阅感兴趣的事件,此处订阅了系统事件。OH_HiAppEvent_SetAppEventFilter(systemEventWatcher, DOMAIN_OS, 0, names, 1);// 开发者设置已实现的回调函数,观察者接收到事件后会立即触发OnReceive回调。OH_HiAppEvent_SetWatcherOnReceive(systemEventWatcher, OnReceive);// 使观察者开始监听订阅的事件。OH_HiAppEvent_AddWatcher(systemEventWatcher);return {};} -
onTrigger类型观察者
编辑“napi_init.cpp”文件,定义OnTrigger类型观察者相关方法:
// 定义一个变量,用来缓存创建的观察者的指针。static HiAppEvent_Watcher *systemEventWatcher;// 开发者可以自行实现获取已监听到事件的回调函数,其中events指针指向内容仅在该函数内有效。static void OnTake(const char *const *events, uint32_t eventLen) {Json::Reader reader(Json::Features::strictMode());Json::FastWriter writer;for (int i = 0; i < eventLen; ++i) {Json::Value eventInfo;if (reader.parse(events[i], eventInfo)) {auto domain = eventInfo["domain_"].asString();auto name = eventInfo["name_"].asString();auto type = eventInfo["type_"].asInt();OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.domain=%{public}s", domain.c_str());OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.name=%{public}s", name.c_str());OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.eventType=%{public}d", type);if (domain == DOMAIN_OS && name == EVENT_APP_FREEZE) {auto time = eventInfo["time"].asInt64();auto foreground = eventInfo["foreground"].asBool();auto bundleVersion = eventInfo["bundle_version"].asString();auto bundleName = eventInfo["bundle_name"].asString();auto processName = eventInfo["process_name"].asString();auto pid = eventInfo["pid"].asInt();auto uid = eventInfo["uid"].asInt();auto uuid = eventInfo["uuid"].asString();auto exception = writer.write(eventInfo["exception"]);auto hilogSize = eventInfo["hilog"].size();auto handleSize = eventInfo["event_handler"].size();auto handleSize3s = eventInfo["event_handler_size_3s"].asString();auto handleSize6s = eventInfo["event_handler_size_6s"].asString();auto peerBindSize = eventInfo["peer_binder"].size();auto threadSize = eventInfo["threads"].size();auto memory = writer.write(eventInfo["memory"]);auto externalLog = writer.write(eventInfo["external_log"]);auto logOverLimit = eventInfo["log_over_limit"].asBool();auto process_life_time = eventInfo["process_life_time"].asString();OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.time=%{public}lld", time);OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.foreground=%{public}d", foreground);OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.bundle_version=%{public}s", bundleVersion.c_str());OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.bundle_name=%{public}s", bundleName.c_str());OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.process_name=%{public}s", processName.c_str());OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.pid=%{public}d", pid);OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.uid=%{public}d", uid);OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.uuid=%{public}s", uuid.c_str());OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.exception=%{public}s", exception.c_str());OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.hilog.size=%{public}d", hilogSize);OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.event_handler.size=%{public}d", handleSize);OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.event_handler_3s.size=%{public}s", handleSize3s.c_str());OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.event_handler_6s.size=%{public}s", handleSize6s.c_str());OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.peer_binder.size=%{public}d", peerBindSize);OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.threads.size=%{public}d", threadSize);OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.memory=%{public}s", memory.c_str());OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.external_log=%{public}s", externalLog.c_str());OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.log_over_limit=%{public}d", logOverLimit);OH_LOG_INFO(LogType::LOG_APP, "HiAppEvent eventInfo.params.process_life_time=%{public}s", process_life_time.c_str());}}}}// 开发者可以自行实现订阅回调函数,以便对获取到的事件打点数据进行自定义处理。static void OnTrigger(int row, int size) {// 接收回调后,获取指定数量的已接收事件。OH_HiAppEvent_TakeWatcherData(systemEventWatcher, row, OnTake);}static napi_value RegisterWatcher(napi_env env, napi_callback_info info) {// 开发者自定义观察者名称,系统根据不同的名称来识别不同的观察者。systemEventWatcher = OH_HiAppEvent_CreateWatcher("onTriggerWatcher");// 设置订阅的事件为EVENT_APP_FREEZE。const char *names[] = {EVENT_APP_FREEZE};// 开发者订阅感兴趣的事件,此处订阅了系统事件。OH_HiAppEvent_SetAppEventFilter(systemEventWatcher, DOMAIN_OS, 0, names, 1);// 开发者设置已实现的回调函数,需OH_HiAppEvent_SetTriggerCondition设置的条件满足方可触发。OH_HiAppEvent_SetWatcherOnTrigger(systemEventWatcher, OnTrigger);// 开发者可以设置订阅触发回调的条件,此处是设置新增事件打点数量为1个时,触发onTrigger回调。OH_HiAppEvent_SetTriggerCondition(systemEventWatcher, 1, 0, 0);// 使观察者开始监听订阅的事件。OH_HiAppEvent_AddWatcher(systemEventWatcher);return {};}
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将RegisterWatcher注册为ArkTS接口。
编辑“napi_init.cpp”文件,将RegisterWatcher注册为ArkTS接口:
static napi_value Init(napi_env env, napi_value exports){napi_property_descriptor desc[] = {{ "registerWatcher", nullptr, RegisterWatcher, nullptr, nullptr, nullptr, napi_default, nullptr }};napi_define_properties(env, exports, sizeof(desc) / sizeof(desc[0]), desc);return exports;}编辑“index.d.ts”文件,定义ArkTS接口:
export const registerWatcher: () => void; -
编辑“EntryAbility.ets”文件,在onCreate()函数中新增接口调用。
// 导入依赖模块import testNapi from 'libentry.so'// 在onCreate()函数中新增接口调用// 启动时,注册系统事件观察者testNapi.registerWatcher(); -
编辑“Index.ets”文件,新增按钮触发卡顿事件。
Button("appFreeze").onClick(() => {setTimeout(()=>{while(true) {}}, 1000)}) -
点击DevEco Studio界面中的运行按钮,运行应用工程,然后在应用界面中点击按钮“appFreeze”,触发一次应用无响应事件。
验证观察者是否订阅到应用无响应事件
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应用工程崩溃退出后再次运行可以在Log窗口看到对系统事件数据的处理日志。
HiAppEvent eventInfo.domain=OSHiAppEvent eventInfo.name=APP_FREEZEHiAppEvent eventInfo.eventType=1HiAppEvent eventInfo.params.time=1502049167732HiAppEvent eventInfo.params.foreground=1HiAppEvent eventInfo.params.bundle_version=1.0.0HiAppEvent eventInfo.params.bundle_name=com.example.myapplicationHiAppEvent eventInfo.params.process_name=com.example.myapplicationHiAppEvent eventInfo.params.pid=1587HiAppEvent eventInfo.params.uid=20010043HiAppEvent eventInfo.params.uuid=a78a23b20f3dd9730f18a5cfa2304deac1104ac4086755c4a59cf7c72d414e2eHiAppEvent eventInfo.params.exception={"message":"App main thread is not response!","name":"THREAD_BLOCK_6S"}HiAppEvent eventInfo.params.hilog.size=6HiAppEvent eventInfo.params.event_handler.size=16HiAppEvent eventInfo.params.event_handler_3s.size=15HiAppEvent eventInfo.params.event_handler_6s.size=16HiAppEvent eventInfo.params.peer_binder.size=0HiAppEvent eventInfo.params.threads.size=28HiAppEvent eventInfo.params.memory={"pss":0,"rss":0,"sys_avail_mem":1326520,"sys_free_mem":940588,"sys_total_mem":1992340,"vm_heap_total_size":"9961472","vm_heap_used_size":"7596424","vss":0}HiAppEvent eventInfo.params.external_log=["/data/storage/el2/log/hiappevent/APP_FREEZE_1502049185239_1587.log"]HiAppEvent eventInfo.params.log_over_limit=0HiAppEvent eventInfo.params.process_life_time=18 -
若应用无法启动或长时间未启动,开发者可以参考使用FaultLogExtensionAbility订阅事件回调重写的函数,进行延迟上报。
移除并销毁事件观察者
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移除事件观察者。
static napi_value RemoveWatcher(napi_env env, napi_callback_info info) {// 使观察者停止监听事件OH_HiAppEvent_RemoveWatcher(systemEventWatcher);return {};} -
销毁事件观察者。
static napi_value DestroyWatcher(napi_env env, napi_callback_info info) {// 销毁创建的观察者,并置systemEventWatcher为nullptr。OH_HiAppEvent_DestroyWatcher(systemEventWatcher);systemEventWatcher = nullptr;return {};}