可以在startLiveView创建实况窗时记录下当前时间，再获取实况窗请求体的倒计时时间，开始计时之后循环计算当前时间减去开始时间是否小于倒计时时间，是则继续循环，否则调用stopLiveView方法结束实况窗。实况窗的构建及开启可参考创建实况窗。完整代码参考如下：
import { liveViewManager } from '@kit.LiveViewKit';
import { Want, wantAgent } from '@kit.AbilityKit';
import { hilog } from '@kit.PerformanceAnalysisKit';
import { BusinessError } from '@kit.BasicServicesKit';
const TIME = 10000; // 倒计时实况窗计时器初始值
export class LiveViewController {
// 获取实况窗请求体的倒计时时间
public async startLiveView(): Promise<liveViewManager.LiveViewResult> {
// 校验实况窗开关是否打开
if (!await LiveViewController.isLiveViewEnabled()) {
throw new Error('Live view is disabled.');
}
// 创建实况窗
const defaultView = await LiveViewController.buildDefaultView(1);
return await liveViewManager.startLiveView(defaultView);
}
async stopLiveView(): Promise<void> {
try {
// 定义要结束的liveView
const defaultView = await LiveViewController.buildDefaultView(2);
liveViewManager.stopLiveView(defaultView).then(() => {
hilog.info(0x0000, 'testTag', 'Succeeded in stopping liveView, result: %{public}s');
}).catch((err: BusinessError) => {
hilog.error(0x0000, 'testTag', 'Failed to stop liveView: %{public}d %{public}s', err.code, err.message);
});
} catch (err) {
let e: BusinessError = err as BusinessError;
hilog.error(0x0000, 'testTag', 'Failed to stop liveView: %{public}d %{public}s', e.code, e.message);
}
}
private static async buildDefaultView(sequence: number): Promise<liveViewManager.LiveView> {
return {
id: 123,
event: 'PICK_UP',
sequence: sequence,
isMute: false,
timer: { time: TIME },
liveViewData: {
primary: {
title: '餐品已备好',
content: [
{ text: '请前往' },
{ text: '一号窗口', textColor: '#FFFF0000' }
],
keepTime: 1,
clickAction: await LiveViewController.buildWantAgent(),
extensionData: {
text: '待取餐',
type: liveViewManager.ExtensionType.EXTENSION_TYPE_COMMON_TEXT
},
layoutData: {
layoutType: liveViewManager.LayoutType.LAYOUT_TYPE_PICKUP,
title: '取餐码',
content: '72988',
underlineColor: '#FFFF0000',
descPic: 'coffee.jpg'
}
}
}
};
}
private static async isLiveViewEnabled(): Promise<boolean> {
return await liveViewManager.isLiveViewEnabled();
}
private static async buildWantAgent(): Promise<Want> {
const wantAgentInfo: wantAgent.WantAgentInfo = {
wants: [
{
bundleName: 'com.example.liveview', // 应用实际bundleName
abilityName: 'EntryAbility'
} as Want
],
actionType: wantAgent.OperationType.START_ABILITIES,
requestCode: 0,
actionFlags: [wantAgent.WantAgentFlags.UPDATE_PRESENT_FLAG]
};
const agent = await wantAgent.getWantAgent(wantAgentInfo);
return agent;
}
}
@Entry
@Component
struct Index {
private message: string = '开启实况窗';
@State starttime: number = 0;
private LiveViewController: LiveViewController = new LiveViewController();
// 循环计算当前时间减去开始时间是否小于倒计时时间
async countDown() {
while (new Date().getTime() - this.starttime < TIME) { // start为开启实况窗的时间，TIME为实况窗设置的倒计时时间
await this.sleep(1000);
}
this.LiveViewController.stopLiveView();
}
// 睡眠
sleep(ms: number): Promise<void> {
return new Promise(resolve => setTimeout(resolve, ms));
}
build() {
Column() {
Text(this.message)
.fontSize(50)
.fontWeight(FontWeight.Bold)
.onClick(() => {
this.LiveViewController.startLiveView();
this.starttime = new Date().getTime();
this.countDown();
});
}
.height('100%')
.width('100%');
}
}