鸿蒙5.0版开发：订阅卡死事件（ArkTS）

在HarmonyOS 5.0中，开发者可以通过ArkTS订阅应用的卡死事件，以便在应用出现卡死时进行相应的处理。这不仅可以帮助开发者监控应用的稳定性，还可以在问题发生时快速定位问题原因。本文将详细介绍如何在ArkTS中订阅卡死事件，并提供示例代码进行说明。

订阅卡死事件的步骤

导入必要的模块：首先，需要导入hiAppEvent和hilog模块，以便使用事件订阅和日志功能。

import { hiAppEvent, hilog } from '@kit.PerformanceAnalysisKit';

设置事件的自定义参数：在应用启动时，可以设置卡死事件的自定义参数。

let params: Record<string, hiAppEvent.ParamType> = {"test_data": 100,
};
hiAppEvent.setEventParam(params, hiAppEvent.domain.OS, hiAppEvent.event.APP_FREEZE).then(() => {hilog.info(0x0000, 'testTag', `HiAppEvent success to set event param`);
}).catch((err: BusinessError) => {hilog.error(0x0000, 'testTag', `HiAppEvent code: ${err.code}, message: ${err.message}`);
});

添加事件观察者：通过addWatcher方法添加卡死事件的观察者，并实现回调函数来处理卡死事件。

hiAppEvent.addWatcher({name: "watcher",appEventFilters: [{domain: hiAppEvent.domain.OS,names: [hiAppEvent.event.APP_FREEZE]}],onReceive: (domain: string, appEventGroups: Array<hiAppEvent.AppEventGroup>) => {hilog.info(0x0000, 'testTag', `HiAppEvent onReceive: domain=${domain}`);for (const eventGroup of appEventGroups) {hilog.info(0x0000, 'testTag', `HiAppEvent eventName=${eventGroup.name}`);for (const eventInfo of eventGroup.appEventInfos) {hilog.info(0x0000, 'testTag', `HiAppEvent eventInfo.domain=${eventInfo.domain}`);hilog.info(0x0000, 'testTag', `HiAppEvent eventInfo.name=${eventInfo.name}`);hilog.info(0x0000, 'testTag', `HiAppEvent eventInfo.eventType=${eventInfo.eventType}`);hilog.info(0x0000, 'testTag', `HiAppEvent eventInfo.params.time=${eventInfo.params['time']}`);hilog.info(0x0000, 'testTag', `HiAppEvent eventInfo.params.foreground=${eventInfo.params['foreground']}`);hilog.info(0x0000, 'testTag', `HiAppEvent eventInfo.params.bundle_version=${eventInfo.params['bundle_version']}`);hilog.info(0x0000, 'testTag', `HiAppEvent eventInfo.params.bundle_name=${eventInfo.params['bundle_name']}`);hilog.info(0x0000, 'testTag', `HiAppEvent eventInfo.params.process_name=${eventInfo.params['process_name']}`);hilog.info(0x0000, 'testTag', `HiAppEvent eventInfo.params.pid=${eventInfo.params['pid']}`);hilog.info(0x0000, 'testTag', `HiAppEvent eventInfo.params.uid=${eventInfo.params['uid']}`);hilog.info(0x0000, 'testTag', `HiAppEvent eventInfo.params.uuid=${eventInfo.params['uuid']}`);hilog.info(0x0000, 'testTag', `HiAppEvent eventInfo.params.exception=${JSON.stringify(eventInfo.params['exception'])}`);}}}
});

示例代码

以下是一个完整的示例，展示如何在ArkTS中订阅卡死事件：

@Entry
@Component
struct FreezeEventSubscriptionExample {build() {Column() {Button('Subscribe to Freeze Event').onClick(() => {import { hiAppEvent, hilog } from '@kit.PerformanceAnalysisKit';let params: Record<string, hiAppEvent.ParamType> = {"test_data": 100,};hiAppEvent.setEventParam(params, hiAppEvent.domain.OS, hiAppEvent.event.APP_FREEZE).then(() => {hilog.info(0x0000, 'testTag', `HiAppEvent success to set event param`);}).catch((err: BusinessError) => {hilog.error(0x0000, 'testTag', `HiAppEvent code: ${err.code}, message: ${err.message}`);});hiAppEvent.addWatcher({name: "watcher",appEventFilters: [{domain: hiAppEvent.domain.OS,names: [hiAppEvent.event.APP_FREEZE]}],onReceive: (domain: string, appEventGroups: Array<hiAppEvent.AppEventGroup>) => {hilog.info(0x0000, 'testTag', `HiAppEvent onReceive: domain=${domain}`);for (const eventGroup of appEventGroups) {hilog.info(0x0000, 'testTag', `HiAppEvent eventName=${eventGroup.name}`);for (const eventInfo of eventGroup.appEventInfos) {hilog.info(0x0000, 'testTag', `HiAppEvent eventInfo.domain=${eventInfo.domain}`);hilog.info(0x0000, 'testTag', `HiAppEvent eventInfo.name=${eventInfo.name}`);hilog.info(0x0000, 'testTag', `HiAppEvent eventInfo.eventType=${eventInfo.eventType}`);hilog.info(0x0000, 'testTag', `HiAppEvent eventInfo.params.time=${eventInfo.params['time']}`);hilog.info(0x0000, 'testTag', `HiAppEvent eventInfo.params.foreground=${eventInfo.params['foreground']}`);hilog.info(0x0000, 'testTag', `HiAppEvent eventInfo.params.bundle_version=${eventInfo.params['bundle_version']}`);hilog.info(0x0000, 'testTag', `HiAppEvent eventInfo.params.bundle_name=${eventInfo.params['bundle_name']}`);hilog.info(0x0000, 'testTag', `HiAppEvent eventInfo.params.process_name=${eventInfo.params['process_name']}`);hilog.info(0x0000, 'testTag', `HiAppEvent eventInfo.params.pid=${eventInfo.params['pid']}`);hilog.info(0x0000, 'testTag', `HiAppEvent eventInfo.params.uid=${eventInfo.params['uid']}`);hilog.info(0x0000, 'testTag', `HiAppEvent eventInfo.params.uuid=${eventInfo.params['uuid']}`);hilog.info(0x0000, 'testTag', `HiAppEvent eventInfo.params.exception=${JSON.stringify(eventInfo.params['exception'])}`);}}}});}).width('100%').height(50)}.width('100%').height('100%').padding(20);}
}

在这个示例中，我们创建了一个按钮，当点击按钮时，会设置卡死事件的自定义参数并添加卡死事件的观察者。当卡死事件发生时，会通过onReceive回调函数接收事件数据，并使用hilog打印日志信息。