42 lines
1.3 KiB
Plaintext
42 lines
1.3 KiB
Plaintext
import commonEventManager from '@ohos.commonEventManager';
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import Base from '@ohos.base';
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@Component
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@Entry
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export struct SystemEventPage {
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// 用于保存创建成功的订阅者对象，后续使用其完成订阅及退订的动作
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subscriber: commonEventManager.CommonEventSubscriber | null = null;
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// 订阅者信息
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subscribeInfo: commonEventManager.CommonEventSubscribeInfo = {
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events: ["usual.event.SCREEN_OFF"], // 订阅灭屏公共事件
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}
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aboutToAppear(): void {
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// 创建订阅者回调
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commonEventManager.createSubscriber(this.subscribeInfo, (err: Base.BusinessError, data: commonEventManager.CommonEventSubscriber) => {
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if (err) {
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console.error(`Failed to create subscriber. Code is ${err.code}, message is ${err.message}`);
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return;
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}
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console.info('Succeeded in creating subscriber.');
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this.subscriber = data;
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// 订阅公共事件回调
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})
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// 订阅公共事件回调
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if (this.subscriber !== null) {
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commonEventManager.subscribe(this.subscriber, (err: Base.BusinessError, data: commonEventManager.CommonEventData) => {
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if (err) {
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console.error(`Failed to subscribe common event. Code is ${err.code}, message is ${err.message}`);
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return;
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}
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})
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} else {
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console.error(`Need create subscriber`);
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}
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}
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build() {
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}
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} |